Mt s dc trng moi trng trm tich t

VI~N BAN LAM KHOA HQC vA CONG NGH~ VIeT NAM VIEN DIACHAT •• vA DIAVAT LV BIEN •• VIETNAM ACADEMY OF SCIENCE AND TECHNOLOGY INSTITUTE OF MARINE GEOLOGY AND GEOPHYSICS TUYE T-PB' CAOKHO HQI NGHf KHOA HQC BfA clIA T BIEN ToAN HA NQI -~ OC • ouoc LAN THU HAl LONG, 10-12/10/2013 PROCEEDINGS THE SECOND NATIONAL SCIENTIFIC CONFERENCE ON MARINE GEOLOGY HANOI-HA LONG, 10-12 OCTOBER, 2013 29 Nguyin Tiin Hai, Nguyin Quang Tinh Tai bien thien nhien va nguy co t6n thuong cac bai vung tri~u a do; yen bien tinh Thira Thien - HuS 364 30 Vu Hai Bang, Nguyin Ba Thuy, Nguyin Xuan Hi~n Nghien ciru anh huang cua ke song toi suy giam s6ng tau 374 31 Le Xuan Thuyen, Trin Triit Lun thirc su la mot tac nhan nguy hiem gay chim ngap d6ng bang Song Ciru Long 383 32 Nguyin Bich Dy, Nguyin Van T~o, Trinh Thi Thanh Ha, VU Van Ha, Nguyin Trong Tin, Le Buc Luong Lai ban v~ thang dia tfrng ky D~ Tir 393 33 Nguyin NgQc Khai quat v~ sinh dia tfuIg Kainozoi Bi€n Dong Viet Nam theo tai lieu chuang trinh khoan dai dirong (ODP) va mQt s6 v§n d~ lien quan 398 34 Trin Nghi, Nguyin Djch Dy, Ngo Quang Toan Dia tfrng trfun tich D~ Tir cac d6ng bang yen biSn Viet Nam tiSp c~ tir dia tfrng phan t~p 412 35 Trin Nghi, Nguyin Bich Dy, Binh Xuan Thanh, Ngo Quang Toan Dia tfrng tram tich D~ Tir them luc dia Viet Nam tiSp c~ tir dia tfrng phan t~p 431 36 Nguyin Th] NgQc Lan, Dinh Quac Tuin Moi tnrong tram tich cua loat da manh V\ID h~ tfuIg Chau Thai, vung L9c Thanh, huyen LQcNinh, tinh Binh Pluroc 444 37 Nguyin Hiru Hung, Trin Minh Khang Trinh tv dia tfrng cac tao da tram tich va da phun trao tnroc D~ Tir a cac dao tren vinh Thai Lan va vung bo bien Ha Tien, tinh Kien Giang 455 38 B,ng Hoai Nhon, Trin Buc Th~nh, Nguyin Thi Kim Anh, Nguyin Dlnh Khang, Nguyin Mai L1}1l,Nguyin Ngoc Anh MQt s6 d~c trung moi tnrong trfun tich tai 16 khoan bai trieu mi~n B~c Viet Nam 475 39 Pham Van Thanh, Nguyin Thi TUOng, Nguyin Th] Hai Yin, Luong Th] Kim Dung, B,ng Th] Huong D~c diSm dia chat moi tnrong vung yen bien va bien mi~n Trung toi dQ sau 200 m mroc 489 40 Vu Truong Son, Trinh Nguyen Tinh, Pham Th] Nga, Le Van Buc, Nguyin Duy Duyen D~c diSm dia h6a moi tnrong mroc vung bien Cu Lao Cham 502 41 Le Thi Vinh Ch~t luong moi tnrong tram tich dfun D~ Gi, tinh Binh Dinh 511 42 Pham Huu Tam Di~n bien ch~t hrong moi tnrong tram tich day tai dfun Nha Phu - Vinh Binh Cang, tinh Khanh Hoa 520 43 va Truong Son, Van Trong B{), Le Van HQc, Nguyin Buc Th~ng Ti~m nang khoang san r~ day biSn yen bo vung Di~n Huang - Cira Tir Hien va dinh huang cong tac tiSp theo 529 44 Nguyin Van Quy, Bao M~nh Tiin, Nguyin Thi Nguy~t, Trin Thi ve, D~c diem phan b6 va du bao khoang san r~n, v~t lieu xay dung vung yen biSn va bien mien Trung dSn dQ sau 200 m mroc 540 45 Pham Th] Nga, Le Van Due, Nguyin Duy Duyin, Le Van HQc D~c diem dia h6a nguyen t6 Ti cac tnrong tram tich bien yen bo Di~n Huang- Tu Hien (Thira Thien - HuS) 554 46 Shakirov Renat, Nguyen Nhu Trung, Phung Van Phach, Obzhirov Anatoly, Le Due Anh, Mal'tseva Elena, lugai losif, Telegin lurii, Syrbu Nadezhda, Stukan Kristina Gasgeochemical featrures of Bac Bo gulf (Gulf of Tonkin)New results of joint Vietnam-Russia Lab for marine geosciences and technology 560 H(Jinghi Khoa h9C Dia chdt bidn toan quoc ldn tM II MQT so D~C TRUNG MOl TRUONG TRAM 'rtcn T~I LO KHOAN BAI TRIEU MIEN BAc VI~T NAM D~ng Hoai Nhon, Tr§n Duc Thanh, Nguy~n Th] Kim Anh, Nguy~n Dinh Khang, Nguy~n Mai Luu, Nguy~n Ngoc Anh ne« Tai nguyen va Moi truong biin, 246 Ph6 t» Nang, TP Hai Phong Esmail: nhondh@imer.ac.vnhoijcnhonhio@yahoo.com TOM TAT: Moi truong tr6m tich bdi triJu miJn Bilc n« Nam keo dai tir M6ng cs tJin Kim San duoc chia kiiu mang nhiing net tJijc thu khac nhau: miii truong tr6m tich bdi trieu chdu th6 keo dai tit Kim Son tJin tdy nam D6 San voi cac tJijc trung chiu anh huang Ian tit moi truong luc dia, tJijc biet la cac song chay ra, moi truong trdm tich bdi triJu cua song Bach D{mg keo dai tit tdy nam Cat Ba tJin dong bac D6 San voi tJgc trung thuy triJu chdm uu thi so voi cac song tJ6 vao, moi truong trdm tich bdi triJu viing vinh keo dai tit M6ng Cai tJin Cat Ba voi tJgc trung cua thuy triJu thdng thi tuyet tJ6i, vai tro cua song luc ilia anh huang khong dang kl Thanh phdn trdm tich va cac tJijc trung cua moi truong trdm tich bdi triJu phan anh qua phdn trdm tich va phdn b6 cac loai trdm tich nhu cat Ion, cat trung, cat nho, bot ltm, bun bot nho va bun set bot Cac thong s6 cua trdm tich nhu tJi) dm dao dong tit 13,6144,37 %; tJi)r6ng trdm tich dao tJi)ng 0,41-0,67; pH trdm tich dao dong 6,90-8,28; Eh trdm tich dao dong (-102,60) - (-19,70) mV; Nts trdm tich dao dong 283,39-1449,10 mg/kg kho; Pts trdm tich dao dong 95,81-646,60 mg/kg kho; Chc trdm tich dao dong 24,23-1984,32 mg/kg kho; Sts trdm tich dao dong 29,54-7096,15 mg/kg kho SI! tdp trung tl! nhien cua luu huynh vai ham luong cao trdm tich a biii trieu cua song Bach Dang va biii trieu viing vinh keo dai tit Cat Ba tJin M6ng Cai cdn duac quan tam va xu If' qua trinh phdt trien kinh Ii - xd hoi Luu huynh tich tu tr6m tich voi ham luong cao gijp mtii truong giau oxi, chung se lam giam pH marc va trdm tich thdp xuong se anh huang tJin cac loai sinh vdt thuy sinh TITKHOA: Bili trieu, tr&mtich, pH, Eh, dinh duong MODAu M6i tnrong tram tich la kSt qua cua nhi~u qua trinh tuong tac khac the gioi tir nhien, nhtrng thay d6i cua m6i tnrong nr nhien c6 th€ ghi lai nhieu d~u ~n cac t&ng tram tich Nghien ciru m6i truong tram tich nham kh6i phuc lai nhirng di~u kien xay qua khir, hien tai, nham danh gia dir bao cho tuong lai Trong diai yen bo n6i chung, bai tri~u la th€ dia ch~t kha phirc tap, chung chiu tac dong cua nhi~u qua trinh Tidu ban Dia cMt va Tai nguyen, Khoang san bidn 475 H6i nghi Khoa hoc Dia eMt bidn toan quoc tdn (hull W nhien, nhan sinh Nhirng tac dong co th~ tim hieu diroc thong qua nghien ciru cac tinh chat cua tram tich Bai trieu duoc nhieu nha khoa hoc tren th~ gioi quan tam nghien ciru vi cac Iy v~ IQ'i Ich v~ kinh t~ nuoi thuy hai san, cac qua trinh bo cac cong trinh bao v~ be bien, va Iy khong the thieu vai tro bao t6n tu nhien truce moi tnrong la tinh da dang sinh h9C nhirng tac dong cang tang cua nguoi len bai trieu Bai trieu ven bo mien B~c keo dai ill Tra C6 d~n Kim San voi ba ki~u moi tnrong tr~m tich C(J ban la moi tnrong tr~m tich bili tri~u viing vinh keo dai ill Mong Cai d~n Cat Ba, rnoi truong tr~m tich bai tri~u cira song hinh ph~u phan b6 ill tay nam Cat Ba d~n dong b~c D6 Son va rnoi tnrong tr~m tich bai trieu chau th6 phan b6 keo dai nr tay nam f)6 San d~n Kim Son (Ninh Binh) Chung dil diroc cac tac gia nuoc nghien cuu cac v~ phan tram tich va t6c d('> lang dong tram tich tren bai trieu Kim San [6], [7], phan tram tich va tien hoa rnoi tnrong tram tich tren biii trieu Nghla Hung [5], khoang v~t nang va tram tich tren bai trieu Hai Hau Quat Lam [10], t6c d('>I~g dong va kim loai nang tram tich tren bai tri~u cira song Ba Lat [9],[13], d?c di~n dia hoa tren bai trieu Hai Phong - Quang Yen [4], [9], [11], [12], cac d?c trung v~ kim loai tram tich ven bo co bili tri~u H~ Long - Ha C6i [1], [2], [11] nhirng cong trinh d6 dil phan anh m('>ts6 d?c tnrng co ban cua moi tnrong tram tich bai trieu Mi~n B~c Vi~t Nam v~y h~u h~t chung chi dung lai a viec phan tich dac trung tram tich t~ng mat Nhfrng d?c tnrng cua moi tnrong tr~m tich bai trieu Mi~n Bac duoc th~ hien qua cac thong s6 tram tich nhir phan d('>hat, d('>§.m, d('>r6ng, pH, Eh, Nts, Pts, Sts, Chc Nghien ciru cac thong s6 tram tich se gop phan lam sang to mot s6 d?c tnrng moi truong tram tich a moi vung, I TAl LI~U vA PHUONG PHAp NGHIEN CUu 1.1 Tili Ii~u Tai li~u trinh bay bao cao la k~t qua nghien ciru cua d~ tai dp Vien Han lam Khoa hoc va Cong nghe Vi~t Nam nam 2012 - 2014 "Nghien cuu diln bi~n tich liiy mot s6 chdt () nhilm co ac}ctinh trdm tich biii trieu ven bi~n miJn Bilc Viet Nam" cac dot khao sat 2012-2013 Thu c('>t16 khoan tr~m tlch tai cac khu VIJC Mong Cai (ky hieu MC VII), cira song Ba Che - f)6ng Rui (ky hieu MC VI), vinh Cira Luc - H~ Long (ky hieu MC V), cira song Cam Lach Tray (ky hieu MC IV), cira song Thai Binh (ky hieu MC III), cua Ba Lat (ky hieu Me II), cira Day (ky hieu MC I) 1.2 Phuong phap nghien cuu 12.1 Phuong pluip iliJu tra kluio sat Cac 16 khoan d~u nam a bai trieu thap, tai m6i vi tri thu mfiu duoc xac dinh bang dinh vi v~ tinh co vi tri nhu hinh 1, cac thong s6 pH va Eh 16 khoan tram tich duoc tren may nhanh ngoai hien tnrong Cac 16 khoan tr~m tich diroc c~t each d~u ern va cac mftu str dung cho phan tich khac diroc bao quan lanh 476 a 4°C cho d~n v~ phong thi nghiern tu« ban ot« eMt va Tai nguyen, Khoang san bidn H6i nghi Khoa h9C Dia chat biin toan quoc tdn th{r11 nhfit g~p tren biii trieu Cira Luc - H~ Long (MC V) Tren biii trieu Ba CM - D6ng Rui (MC VI) oQ r6ng dao oQng 0,44-0,64, dQ r6ng trung binh 0,52; tren bai trieu Cira Luc - H~ Long (MC V) oQ r6ng dao oQng 0,41-0,66, oQ r6ng trung binh 0,48; tren biii trieu Hai Phong (MC IV) oQ r6ng dao dong 0,54-0,67, oQ r6ng trung binh 0,60; tren bai tri~u cira song Thai Binh (MC III) oQ r6ng dao oQng 0,48-0,60, oQ r6ng trung binh 0,54; tren bai tri~u cira Ba Lat (MC II) oQ r6ng dao dong 0,440,64, oQ r6ng trung binh 0,52; tren biii trieu cira Day (MC I) oQ r6ng dao oQng 0,44-0,56, oQ r6ng trung binh 0,49 (hinh 3) 0(1 r6ng (0-1) ~.&g(O-l) o.~ 0,8 0.7 0.' O} 0.' DOrMg (G-l) MCV DQr6ng(O-l) ~r6ng(0-11 DO r6ng (0-1) 0.' I MCII MCI Hinh 3: D6 r6ng trdm tieh tren cae biii triJu ven bo MiJn B&e II.3 Thanh phAn trAm tich va phan bB trAm tich Tren biii trieu ven bo Mi~n B~c phan b6 cac loai trftm tich tir cat Ion, cat trung, cat nho, bQt Ian, bun bQt nho va bun set bQt, theo chieu thing dung thi phftn trftm tich co su phan di 16 khoan tram tich, sir thay 06i phan anh ban chfit moi tnrong (; thai ky tao tr~m tich giai doan 00 Tren bai trieu khu vue Mong Cai (MC VII) phan b6 tram tich co kich tlnroc tu bQt Ian (Md = 0,052-0,084 mm) o€n nhCing kich tluroc cua cat IOn (Md = 0,726 mm) Cat IOn (Md 0,504-0,726 mm) phan b6 (; tftng 26-30 em, oQ chon I9C trung binh (SO = 2,053-2,061); (Md = cat trung = 0,252-0,345 mm) phan b6 ph6 bi€n (; oQ sau 38-52 cm, oQ chon 19Cnr t61 d€n trung binh (So = 1,297-1,951); cat nho (Md = 0, 102-0,247mm) phan b6 ph6 bi~n nhfit cQt khoan (; cac oQ sau 54-86 ern, oQ chon 19Ctir t6t o€n kern (So = 1,393-6,381); bQt Ian (Md = 0,052-0,084 mm) phan b6 (; tren tftng m~t (; oQ sau 0-10 ern, oQ chon 19Ckern (So = 4,747-5,457) Tren bill tri~u Cira Luc - H~ Long (MC V) trftm tich phan M ill bQt IOn (Md = 0,081 mm) o€n cat nho (Md = 0,181 mm) Cat nho (Md = 0,103-0,181 mm) chi~m dai da s6 16 khoan phan ill 6-66 em, oQ chon 19Ct6t o~n kern (SO = 1,531-3,518); bQt Ian (Md M = 0,080-0,089 mm) phan M (; tren ~ m~t cQt khoan 0-6cm, oQ chon 19Ccua trftm tich kern (So = 3,684-4,047) tu« ban Dia chat va Tai nguyen, Khoang san biin 479 H6i nghi Khoa hoc Dia chat bidn toan qu6e 11mthtr II 108001' 106' 00' 21' 34' , CHU GIAI • Diim thu 16khoan W+E N o 19' " ," 1: ,,\, 25 Km I: ( 56' ' ":.::: -_"' S 19' -J55' -L 108'01' 106' 00' Hinh 1: Sa ad vi tri thu mdu tren bdi tri~u ven bo Mi~n Bae n« Nam L2.2 Phuong pluip phbng thi nghi~m DQ ~m tr~m tich: Can 5-10 g tram tich uot sau dem x~y kho d~n khoi luong khong d6i a 105°C DQ ~m tram tich diroc tinh theo cong thirc (1) Trong W- dQ ~m (%); a- kh6i luong m~u trot (g); b- kh6i luong m~u kho (g) a-b W(%) = xIOO a (1) DQ r6ng cua tram tich duoc tinh dua theo dQ ~m, cong thirc (2) P- dQ r6ng; %wham hrong nuoc (%); Ds- 15' tram tich P = 2,5 g/crrr' [3]; Dw- 15' cua mroc 1,0 g/crrr' %w·D, = (2) %w·D, +%Ds·Dw Phan tich phan dQ hat tram tich: M~u tram tich diroc xu Iy bang H202 va nuoc c~t sau sir dung ray 0,063 mm tach lam dp hat phan dp hat Ian hon 0,063 mm duoc phan tich bang ray, ph~n kich thurrc c~p hat nho hon 0,063 mm dem phan tich bang phirong phap pipet Phan loai tr~m tich theo phan loai cua Lisitzin A.P.(1986) [8] Phan tich cac nguyen t6 (Nts, Pts, Sts, Chc): Nito tong s6 (Nts) - duoc pharr tich bang phirong phap Kjendhal, cho axit H2S04 d~m d?c vao m~u tram tich va pha m§:u bang bep each cat, sau su dung binh chi~t Kjendhal dira nito cac dang v€ NH4+, su dung thuoc thir Nessler tao mau va so mau bang may quang Ph6t t6ng s6 (Pts) - Slr dung axit HN03 d?c hoa tan cac dang phdt tram tich sau dun nong dum bep each cat, dung muoi molipden d~ lam thuoc thir tao mau, so mau bang may quang ph6 Carbon hiru co (Chc) - oxi hoa Chc bang kali bicromat tu« ban Dia chat va Tai nguyen, Khodng san biin ~ 477 H9i nghi Khoa h9C Dia chat bien toan quoc tdn thu' 11 (K2Cr207) dir da bi~t tnroc nong de>,Chc bi oxi hoa h~t b61 K2Cr207, ph~n K2Cr207 dir duoc chuan de>nguoc bang muoi Mohr d~ biet duoc hrong K2Cr207 da tieu thu oxi hoa Chc co tram tfch Luu huynh t6ng s6 (Sts) - su dung axit HN03 pha m~u tram tich dua cac dang luu huynh v~ dang S042- cua cac muoi tan, sau I~y mot hrong m~u da pha cho vao BaCh dir cho d~n th~y m~u co k~t ilia BaS04 IQc k~t ilia va din va tinh toan hrong Sts qua kh6i hrong BaS04 k~t tua, II KET QuA NGHIEN CUU ILL DQ ~m tr§m tich D9 Am tdm tich Ian nhat g~p tren bai trieu Hai Phong (MC IV), th~p nhat g~p tren bai trieu CU'a Luc - H~ Long (MC V) Tren bai trieu Ba Che - Dong Rui (MC VI) de>Am 13,61-43,16 %, de> Am trung binh 34,69 %; tren bai trieu Cira Luc - H~ Long (MCV) de>Am dao dong 21,75 43,35 %, de>Am trung binh 26,88 %; tren bai trieu ven be Hai Phong (MC IV) de>Am dao dong tir 31,85-44,31 %, de>Am trung binh 37,98 %; dao dong HilmlllOng(%) to 30 2Am dao dong 27,27-37,80 %, de> Am trung binh 32,27 %; tren bai trieu cua Ba L~t (MC II) de> Am dao dong 11,80-41,83 %, de>Am trung binh 29,72 %; tren bai trieu cira Day (MC I) de> Am dao dong 23,65-33,85 %, de> Am trung binh 27,59 % (hinh 2) 11.2 DQ rBng tr§m tich De>r6ng cua tr~m tich chung la chi tieu co ban cua tr~m tich, chung co vai tro chira nuoc va hru d~n mroc tram tich di ill ting d~n t~g khac, no co vai tro va y nghia Ian d6i voi cac qua trinh da sorn cua tr~m tfch Trong nhtrng loai tram tich da da till de>r6ng thirong nho (0,00-0,25), cac tr~m tich hien dai de>r6ng thuong dao de>ng 0,25-1,00 Tren bai trieu ven bo mien B~c de>r6ng cua tr~m tich Ian nh~t g~p tren bai tri~u Hai Phong (MC IV), nho 478 tu« ban Dia chdt va TOi nguyen, Khodng san biin H(Jinghi Khoa hoc Dia chat biin loan qu6c idn 1M II nh~t g~p tren bai tri~u Cira Luc - H~ Long (MC V) Tren bai trieu Ba CM - D6ng Rui (MC VI) dQ r6ng dao dQng 0,44-0,64, dQ r6ng trung binh 0,52; tren bai trieu Cira Luc - H~ Long (MC V) dQ r6ng dao dQng 0,41-0,66, dQ r6ng trung binh 0,48; tren bai trieu Hai Phong (MC IV) dQ r6ng dao dQng 0,54-0,67, dQ r6ng trung binh 0,60; tren bai tri~u cira song Thai Binh (MC III) dQ r6ng dao dong 0,48-0,60, dQ r6ng trung binh 0,54; tren bai trieu cua Ba Lat (MC II) dQ r6ng dao dQng 0,440,64, dQ r6ng trung binh 0,52; tren bai trieu cira Day (MC I) dQ r6ng dao dong 0,44-0,56, dQ r6ng trung binh 0,49 (hinh 3) ~r6ng(O"1 00 rOng (0-1) " 0.' 0.7 0.' 0.' 0.8 0.7 ~r6ng(G-l) 0.' Mev Me IV , ~'" gOO 70 OQ r6ng (0-1) OQr6ng(D-I) ~r6ng(0-1) 0.7 0.' 0.7 0.8 " 0.' I MCIII Me!! MC' _lO [ K" ~" ~" 8"" 8"" Hinh 3: DC; r6ng trdm tich tren cac biii tri€u ven bo Mi€n Bac II.3 Thanh phAn trAm tich va phan ba trAm tich Tren bai tri~u ven bo Mi~n B~c phan b6 cac loai trAm tich tir cat Ion, cat trung, cat nho, bQt IOn, bun bQt nho va bun set bot, theo chieu thang dung thi ph An tram tich co sir phan d] 16 khoan tram tich, sir thay d6i phan anh ban ch~t rnoi tnrong (] thai ky tao tram tich giai doan Tren bai trieu khu vue M6ng Cai (MC VII) phan b6 tram tich co kich thuoc tir bQt IOn (Md = 0,052-0,084 mm) d~n nhtrng kich thuoc cua cat IOn (Md = 0,726 mm) Cat IOn (Md 0,504-0,726 mm) phan b6 (] tang 26-30 em, dQ chon 19Ctrung binh (SO = 2,053-2,061); (Md = cat trung = 0,252-0,345 mm) phan b6 ph6 bi~n (] dQ sau 38-52 ern, dQ chon 19C ill t6t d~n trung binh (So = 1,297-1,951); cat nho (Md = 0,102-0,247mm) phan b6 ph6 bi~n nh~t cQt khoan (] cac dQ sau 54-86 em, dQ chon 19c nr t6t d~n kern (So = 1,393-6,381); bQt IOn (Md = 0,052-0,084 mm) phan b6 (] tren cing mat (] dQ sau 0-10 em, dQ chon 19Ckern (So = 4,747-5,457) Tren bai trieu CUa Luc - H~ Long (MC V) tram tlch phan b6 ill bQt IOn (Md = 0,081 mm) d~n cat nho (Md = 0,181 mm) Cat nho (Md = 0,103-0,181 mm) chi~m dai da s6 16 khoan phan b6 ill 6-66 cm, dQ chon 19Ct6t d~n kern (SO = 1,531-3,518); bot 100 (Md = 0,080-0,089 mm) phan b6 (] tren ~ mat CQtkhoan 0-6cm, dQ chon 19Ccua trAm tich kern (So = 3,684-4,047) tu« ban Dia chat va Tai nguyen, Khodng san biin 479 H9i nghi Khoa h9C Dia chat biin toan quoc itin 1M II Tren bili trieu Hai Phong (MC IV) phan be, loai tnlm tich la bQt Ion, bun bot nho va bun set bot BQt Ian (Md = 0,054-0,057 mm) phan b6 a dQ sau 42-48 em, bQt Ian co dQ chon 19Ckern (So = 2,257-2,975); bun bQt nho (Md = 0,011-0,048 mm) la loai tram tich ph6 bien CQt khoan phan b6 ill tren mat va xen kep cac tAng, dQ chon 19C tram tich kern (So = 2,8783,988), bun set bQt (Md = 0,008-0,010 mm) la loai tram tich co kich thurrc nho nhat vung phan b6 xen kep cac cing tram tich va co dQ day khong Ion, dQ chon 19Ccua tram tich kern (So = 3,421-3,737) Tren bili tri~u cira song Thai Binh (MC III) phan b6 trAm tich co kich thuoc tir bun bQt nho d~n kich thuoc cua bQt Ian BQt Ian (Md = 0,051-0,063 mm) pharr b6 phan IO'n 16 khoan, chung phan b6 ill tren mat, sen kep cac tang khac va d~n dQ sau 66 em, dQ chon a khu 19Ccua bQt Ian V\TCnay ill dQ W trung binh d~n kern (So = 1,740-3,330); bun bQt nho (Md = 0,022-0,050 mm) phan b6 sen kep cac tAng tram tich tren bai trieu, hAu h~t chung d~u co dQ chon 19Ckern (So = 2,893-3,557) cec 0,01 01 0,05 Itc thOng O,t I 0.5 I ~!IIl thOng s6lrtim Md(IftIII) cac lhOng 56 trlim U _ I • I Cl-:::~ • I oOf " j 0,05 ã :.:~: ô11 Men eo 8" ~;.'" , /J.' sd'''im °i ~( ? Hinh 4: Cac thong 0,\ " ? MCIV , •• ~ ," ~ Mcl(fI'IfI'I) 5" ' g" s.) 0.' ".~~.":"'~{~\ _.I "'7- -, ".( • Ueh (Md, 5., S,l °i' ~: Uch (Md s; 0.2 ••• t " "j~ '.; .~ - ,'·:· ·.:ii= Cite thOng 56 d¢ hat (Md 50' 5J "1- ~~""mml s, • s 'oc.·.• " " ' < Me III ~ " ~C>< \ " +1··· Mel I • a-!•• Hinh 7: Ham luong cac nguyen t6 tram tich bdi tridu ven bo Mi~n B6c III THAo LU~N Moi tnrong tram tich tren bili trieu mien B~c co kieu co ban, moi tnrong tr~m tich bili trieu vung ctra song chau th6 keo dai tir Kim San d~n tay nam D6 San, moi tnrong tram tich bai trieu vung cira song Bach Dang keo dai tir dong bac D6 San d~n tay nam Cat Ba va moi tnrong tram tich bili trieu viing vinh keo dai tir Cat Ba d~n Mong Cai, Moi tnrong bai trieu cira song chau th6 mang nhi~u anh huang cua cac song, chung diroc phan anh boi nhi~u bien dQng gily xao tron tr~m tich va bi~n d6i tinh chat cua tr~m tich Cac thong s6 nhu pH chiu nhi~u anh huang cua pH luc dia, h~u h~t cac cQt khoan tram tich tren bai trieu d~u co pH nho hon hoac bang 7,60 g~p a cac cira song Thai Binh, cira Ba Lat va cira Day, Eh tram tich thirong g~n c~n mire oxi hoa cang g~n tren mat Eh cang cao hon cac t~ng diroi Kich thiroc hat tram tich chiem da s6 la bQt Ion, cat nho chiern mot s6 it nhung chung co dQ chon IQc t6t d~n trung binh th~ hi~n moi tnrong chiu tac dQng nhi~u cua sir tuong tac luc dia - bien H~u h~t ham luong Nts tr~m tich cQt khoan co ham luong thap hon cac cac vung cira song Bach Dang va Ba Che - Dong Rui, ham luong Pts tram tlch bili tri~u cira song chau th6 thuong cao hon cira song Bach D~ng va bili tri~u Cira Luc - H~ Long, Ba Che - D6ng Rui va Mong Cai, ham luong Chc tr~m tich vung cira song chau th6 th~p hon so voi bili trieu vfing vinh, ham hrong Sts thap hon so voi bili trieu viing vinh va vung cua song Bach D~ng 484 Tiiu ban Dia cheft va Tai nguyen, Khodng sdn biin H(ii nghi Khoa hoc ot« cMt bidn to an qu6c tdn thu' 11 Moi twang tr~m tich bai tri~u cira song Bach Dang ducc dac tnrng boi trb tich co kich thiroc hat nho, tram tich phan b6 tir bun set bot, bun bQt nho va bQt Ion, cac loai tram tich chiu nhi~u anh huang cua thuy trieu la d~c thu cua vung cira song hinh phi~u, h~u h~t dQ chon IQc cua tr~m tich la kern (So> 2,20), tai cac bai trieu moi twang tram tich kha yen tinh Cac thong s6 d~c tnrng d~c tnrng cua moi twang tdm tich dQ r6ng va dQ Am kha Ion, g~n Ian Ian nh~t s6 cac cac bai tri~u vung nghien ciru Eh va pH tr~m tich co dQ dao dong nho hon cac vung khac, su it khac co la cua dQ r6ng va dQ Am co ham hrong Ian nen cac y~u t6 hoa tan mroc tram tich kha d6ng nh~t cao gifra cac t~ng Cac chat dinh dirong nhir Nts, Pts tram tich cang tren g~n b~ mat co ham luong kha cao, cang xuong sau ham hrong cang giam xuong, so voi cac vung khac thi hai thong s6 co ham luong tram tich cao hon tr~m tich hili trieu vung cira song chau th6 va vung hili trieu viing vinh Khac v61 ban chat cua vung cira song chau th6 tir tay nam ban dao D6 San d~n cira Day, ham luong Sts cang xuong t~ng sau ben duoi lap tr~m tich t~ng mat, chung co sir tang len dang k~ nhirng v~n nho hon cac tram tich viing vinh, Moi twang tram tich bai trieu viing vinh phan Ian chung chiu anh huang cua thuy trieu, vai tro cua song anh huang d~n hili trieu nho hon a vung cira song chau th6 va vung cira song Bach D~ng Phan h6 ki~u hili trieu keo dai tir Mong Cai d~n H~ Long va Cat a tren Ba, mac du phan b6 cac tr~m tich co kich thiroc Ian hon kieu moi twang thong s6 tram tich nhu dQ chon IQc (So) cua tram tich h~u h~t a dQ chon nhung cac IQc trung binh d~n kern, dQ chon IQc trung binh thuong thuong roi VaGcac tram tich cat va dQ chon IQCkern thi roi VaGcac tram tich co kich thuoc cua bot Ian d~n bun hQt nh6 MQt nhirng dac thu khac biet cua moi tnrong tram tich hili trieu vung voi cac bai tri~u chau th6 va hili trieu cira song Bach Dang la phan h6 ham hrong Sts tram tich hili trieu, chung co ham hrong cao hon nhieu l~n tai cac hili trieu vung cira song chau tho Cac nguyen t6 dinh dirong nhir Pts, Nts tram tich co ham IUQ'ngthap hen cac trb th6 va a cira song tich bai tri~u a cira song chau hinh ph~u Y~u t6 pH cua tram tich cang xuong cac t~ng sau vai tro cua bi~n cang thong tri (pH >7,5), tren t~ng tram tich mat thi anh huang cua mroc luc dia th~ hien kha r5 KETLU~N Trb tich bai trieu yen bo mien B~c chiu anh huang cua moi twang tu nhien V\ICth~ hien kha r5 a sir khac a tirng khu biet cac dac tnrng tram tich tai cac hili trieu yen bien dira tren nhfrng d~c trung hili trieu mien B~c chia lam kieu moi twang tram tich co ban la moi tnrong tram tich bai trieu vung cira song chau th6 keo dai tir Kim San d~n tay narn D6 San, moi tnrong trb tich hili trieu vung cira song hinh ph~u keo dai tir tay narn Cat Ba d~n dong b~c D6 San va moi twang tram tich hili tri~u viing vinh keo dai tir M6ng Cai d~n Cat Ba Tidu ban Dia chat va Tai nguyen, Khoang sdn bidn 485 Hoi nghi Khoa h9C Dia chat bien toan quoc 16/11M If TrAm tich tren cac bai trieu ven be mi~n B~c keo dai tir Mong Cai d~n Kim San phan b6 cac loai trAm tich tir cat 16'11,cat trung, cat n110, bot 16n, bun bQt nho va bun set bot Cac thong s6 cua tr~m tich bai tri~u co dQ r6ng dao dQng tir 0,41-0,67; 6,90-8,28; tuong tv dQ Am 13,61-44,31 Eh = (-102,60) - (-19,70) mY; Nts = 283,39-1449,10 mg/kg kho; Chc = 24,23-1984,32 = mg/kg kho; Pts = 95,81-646,60 mg/kg kho; Sts = 29,54-7096,15 Khi sir dung moi truong tram tich bai tri~u dn chu %; pH y mg/kg kho, d6n nhfrng dac thu cua no D?c bi¢t d6i voi moi truong tram tich bai trieu cira song Bach Dang la noi ma v~t li¢u chi~m iru th~ tao di~u kien tich lily va liru trfr cac chAt nhi~m rAt tot, bai lit su tich liiy luu huynh cang cao xuong cac tang sau Su tich liiy luu huynh bi6u hicn cang 1'5 tnrong trAm tich bai trieu viing vinh kco dai ur Cat Ba d6n Mong Cai 86 a m6i dam bao cho cac muc tieu phat trien nuoi thuy san b6n vfrng can phai duoc ti6n hanh nghien CU'l1va XLI' Iy van d~ hru huynh tram tich nham phat huy canh tac lau dai va eo hieu qua d6i voi loai moi tnrong trAm tich bai tri~u VLlI1gvinh va cira song Bach Dang Loi ctun O'Il: Bai bao la k~t qua nghicn ciru cua d~ tai dip Vien Han lam Khoa hoc va Cong nghe Viet Nam "Nghien CU'udi~n bi~n tich liiy mot s6 chat nhi~m co dQc tinh tr~m tich bai trieu ven bien mi~n B~c Viet Nam" ma s6 v AST.CTG.O 1/12-13 Cac lac gia xin earn an Vien Han Him Khoa hoc va Cong nghe Viet Nam d5 h6 tro kinh phi d6 thuc hicn nghien ciru TAl LI~U TIIAM KIlAO Kh~c Giang, 2006 Hien trang nhi6m kim loai nang cua trAm tich bai trieu cira song vung vinh Ticn Yen - Ha C6i, Quang Ninh Tap chi Dia chAt Nguyen Thi Thuc Anh, Nguyen 293, trang 1-10 Nguyen Thi Th\lc geochemistry Anh, of sediments Nguyen Kh~c Giang, Ph;;tn,l Van An, 2005 Environrnetal in estuary and tidal flat: A case study in Ha Long City, Quang Ninh province Journal of Geology, Serial 13 Vol 26, p 55-64 Berner R.A., 1971 Principles Nguyen of chemical sedimentology McGraw-Hill Dire Cu, 1991 MQt s6 d~c di~m dia hoa tram tich rung ngdp man ven bien Mi~n B~c Viet Nam Tuyen t?P Tai nguyen va Moi truong bien Tap I, trang 54-59, NXB Khoa hQC va Ky thuat Ha NQi Quang TuAn, Dang Hoai Nhon, 2003 cAu true va tien hoa dia chat vung b5.i b6i ven bien Nghia Hung Tuyen t~p Nguyen Hiru CU, Nguyen Vii Tuan, Tr5.n Dire Thanh, Nguy6n Tai nguyen va Moi tnrong bien, t~p X, trang 89-104 NXB Khoa hoc va Ky thuat, Ha Noi, VU Thi Thu Hoai, Nguyen Xuan Huyen, 2010 Dac diem phan tram tich bai b6i hi~n dai vung cira song ven bi~n nr cua Ba Lat den Cira Day Khoa hQC va Cong nghe bi~n, tap 10, s6 3, trang 53-67 NXB Khoa hoc Tv nhien va Cong nghe, Ha N9i 486 Tidu ban Dia chdt va Tai nguyen, Khoang san bidn H(Jinghi Khoa h9C Dia cMI bien loan quoc ldn thic /J Trkn Dinh Liin, Trkn Duc Th~nh, 1991 Hinh thai, phan b6 trkm tlch va dac di~m b6i tu bili b6i ven bi~n huyen Kim San Tuyen t~p Tai nguyen va M6i tnrong bien, t~p I, trang 33-39 NXB Kh?a h9C va Ky thuat, Ha N9i Lisitzin A.P., 1986 Principles of geological mapping of marine sediments Unesco Reports in Marine Science N.33, Paris Dang Hoai Nhon, Dinh Van Huy, Nguyen Mai LI,I·u, Nguy~n Dinh Khang, Dinh Van Nhan, Phan San Hili, Pham Ti€n Dire, 2011 T6c d9 lang dong trkm tich va tich lily mot s6 kim loai trkm tich doi gian tri~u vung ven bo chau th6 s6ng Hong In: Pham Huy Ti€n, Phung Van Phach, va nnk (Eds.), H9i ngh] Khoa h9C va C6ng nghe bien toan quoc Ikn thir NXB Khoa h9C Tv nhien va C6ng nghe, Ha N9i, pp 544-555 10 Dang Hoai Nhon, Nguyen Quang Tu§.n, Trkn Dire Thanh, Nguyen Dire CV, Nguyen Hfru Cir, Nguy~n Dire Toan, 2012 Phan b6 tram tich va khoang v~t nang tram tich ven bo Hili Hau, tinh Nam Dinh Tap chi Khoa h9C va C6ng nghe, t~p 50, s6 3E, trang 1.1391.150 NXB Khoa h9C Tv nhien va C6ng nghe, Ha N9i 50 11 Tran Dang Quy, Nguyen Tai Tue, Mai Trong Nhuan, 20 12 Dac diem phan b6 cac nguyen t6 vi luong tram tich tang mat Vinh Tien Yen Tap chi Cac khoa h9C v~ Trai D&t S6 34, t~p 1, trang 10-17 Nxb Khoa h9C Tv nhien va C6ng nghe, Ha N9i 1999 Dia tkng Holocen va c§.u true bai trieu ven be Hili Phung Tap chi 12 Trkn Dire Thanh, Cac khoa h9C v~ Trai D§.t, t~p 3, trang 197-206 NXB Khoa h9C va Ky Thuat, Ha N9i 13 Tue N.T., Quy T.D., Amano A., Hamaoka Historical profiles of trace element Estuary, Red River, Vietnam H., Tanabe S., Nhuan concentrations in mangrove M.T., Omori K., 2011 sediment from Ba Lat Water Air Soil Pollut Volume 223, 1.315-1.330 SUMMARY SOME CHARACTERITICS OF SEDIMENTARY ENVIRONMENT AT SEVEN SEDIMENT CORES ON TIDAL FLATS OF THE NORTH VIET NAM Dang Hoai Nhon, Tran Due Thanh, Nguyen Thi Kim Anh, Nguyen Dinh Khang, Nguyen Mai Luu, Nguyen Ngoe Anh Institute of Marine Environment and Resources, 246 Da Nang Street, Hai Phong city E-mail: nhondh@imer.ac.vnornhonhio@yahoo.com The sedimentary environment of tidal flats in the Northern Vietnam extends from Mong Cai area to Kim Son, which are divided into three regions with different characteristics: the first region is the sedimentary environment of the deltaic tidal flats tu« ban Dia chat va Tai nguyen, Khoang san bidn 487 H(Ji nghi Khoa h9C Dia chd/ bi€n toan quoc ldn thu II extended from Kim Son area to south-western Do Son peninsula due to affected of mainland such as rivers discharge; the second region is the sedimentary environment of the tidal flats of Bach Dang estuary extended from the south-west of Cat Ba island to the north-east of Do Son peninsula with tidal domination and the final region is the sedimentary environment of the embayment tidal flats extended from Mong Cai area to Cat Ba island This region is strongly effected by tide and not significantly affected by rivers The characteristics of sedimentary environment of tidal flats are reflected by the distribution of parameters: coarse sand, medium sand, fine sand, coarse aleurites, finealeuritic mud and aleuritic-pelitic mud The sedimentary factors, such as wet is in the range from 13.61 to 44.37 %; porosity is in the range from 0.41 to 0.67; pH in the range from 6.90 to 8.28; Eh in the range from (-102.60) to (-19.70) mV; Nlolalin the range from 283.39 to 1449.10 mg/kgfor the case of dry weigh; Plotalin the range from 95.81 to 646.60 mg/kg dry weigh; Corganic in the range from 24.23 to 1984.32 mg/kgfor the case of dry weigh and S/Olalin the range from 29.54 to 7096.15 mg/kgfor the case of dry weigh The high concentration of sulfur in tidal sediments at Bach Dang estuary and the embayment environment from Mong Cai area to Cat Ba should be considered in socialeconomy development If the deposited sulfur in tidal sediments with high concentration, it will make pH in sediment and water decrease, affect to aquatic organisim KEYWORDS: tidal flats, sedimentary pH, Eh, nutrient 488 tu« ban Dia chat va Tai nguyen, Khodng san bi€n