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TUYEN T4P cAe CDNG TRiNH NGHIEN coo VE OIEU KIEN TlINHIEN vA TAl NGUYEN THIEN NHIEN VUNG QUAN DAD TRIJ'IJNG SA zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA A ;: A' ') , COLLECTION OF THE CONTRIBUTIONS ON NATURAL CONDITIONS AND RESOURCES OF THE TRUONG SA ARCHIPELAGO TRUNG TAM KHOA HQC TV NHIEN VA CONG NGH~ ouoc GIA PHAN VI~N HAl DUONG HQC T~I HA NQIzyxwvutsrqponmlkjihgfedcbaZYX , , " TUYEN TAP cAe CONG TRiNH NGHIEN coo VE DIEU KIEN TI1 NHIEN vA TAl NGUYEN THIEN NHIEN VUNG QUAN DAD TRUlJNG SA • , • , " • , ? " COLLECTION OF THE CONTRIBUTIONS ON NATURAL CONDITIONS AND RESOURCES OF THE TRUONG SA ARCHIPELAGO " -' ? ,,_ •••• NHA XUAT BAN KHOA HQC VA KY THU~T HA NQI-1998 M l) C L l) C zyxwvutsrqponmlkjihgfedcbaZYXWVUTSR Trang UJi nol WiurqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA · 13 · 17 Phan ZYXWVUTSRQPONMLKJIHGFEDCBA I DlA CHAT • Nguyen Hiep, Nguyen Bieu, Le Duy Bach, Dao Quang An, Bui Ngoc Quang, Ha Quoc Quan, Nguyen Quyet Thang, Bui Cong Que, Trinh Geological • • • The Hieu, Do Tuyet, Nguyen Dinh characteristics Nguyen Bieu Generalities on geological of Truong features Uy Sa archipelago of Truong Sa archipelago Nguy€n The Ti#p f}~c diem dia mao vii dla chat vimg quan duo Truong Sa Sa va cac vilng k€ · 37 ~n • • Trinh The Hieu Types of coral reefs in the Truong Do Minh Tiep Geology of Phan • • j Vinh island 52 of the rocks composition of the Truong and petrophysical Sa archipelago D6 Tuyet, Hoang H a u Quj, Lam Thanh, Nguy€n MQt s6 net ve dia mao quan duo Truong Sa Nguy€n Ng(IC, Nguy€n H i i u Cir ve ranh giili dia tang Pleixtoxen Nguy€n Ng(Jc, Nguy€n H i i u Cir, Cac di tich Foraminifera duo Truong T r iin Dinh 65 Uy 69 - Holoxen iJ khu vue d.lo noi Truong Sa Viin Chien tram tich bai bien duo Nam Yet, qutm Sa (Vi~t Nam) va y nghia ctia chung 77 86 Ha Dtic Thank Mt)t s6 d~c diem dia chat duo san hO Truong • 44 Sa archipelago Ngo Xuan Vinh A study on the petrographical characteristics • · 26utsrqpo U Dtic An Viii di;lc diem ve dia mao day bien quan dao Truong • · 21 Nguy€n Viin Bach, Nguy€n Tien H t ii Cac dao noi vung bien Truong Sa Sa · 93 104 Phan zyxwvutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA I/ DJ,A V!T LY • Bui Ciing Que, Nguy"ln van Gidp, Nguy€n Thu Huong, U Tram, T r iin tua« Dung Nguy€n Duc Thanh, D6 Huy Cuong,ZYXWVUTSRQPONMLKJIHGFEDCBA Ml)t vai net co ban ve d~e diem cllu true Truong Sa theo cac so Ii~u d!a v(lt Iy vo trai dat vung quan dao 115 • Pham van Thuc Dc} nguy hiem dc)ng datutsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA va song than vung quan dao Truong Sa 127 • Nguy€n Hiing Phuong, T r iin Danh gia xac suat dl) nguy • • • • Dung hiem dl)ng dat khu Tudn Cting Que l}~e diem cac truong d] thuong Sa va cac vung bien ke d)n vue quan dao Truong h,fc va tir vung quan dao Truong 161 Hy Thi Ng(), Dotin The Hung, Nguy€n Phuong Nga Ml)t so kH qua nghien cuu ve d~e diem elm tu truong dao TnliJng Sa Cong Que, Hoang van VU(1ng l}~e diem phan b6 m~t dl) va binh cau true khu vue quan d.io TnlCJng Sa trai dat quan 176 Bui Bui Cong Que, Nguyn nô Viin Chien, PhUn )I ã Tran Viin Luong, van Nguy€n Hoang, Dao The mong tnliJc Kainozoi -1SS Ti~p, uuô T ro n g ã MOl TRUONG vA TAl NGUYEN THIEN van Luong, B u ! T h i X u a n , B u i N h i Thanh Nhung ~ket qua nghien cuu nlliJc ngarn tren dao Truong T r iin Dire: Thanb qua khau sat blliJc lIuu nuoc ngam D6 X u d n Sam, Nguy€n van Phuong phap ban nghien Truong • III tren 196 NHIEN Nguy€n Ket • 144 Bui Blick dau khao sat cac d~c diem d!a vi)t Iy va vi)t Iy quyen vung quan dao Truong Sa • Sa Sa va dao Nam yet Sa) Nguy€n Dinh Tran Minh T ru o n g Hoa Tran Sa 218 bo bien dao 227 dao l}d Tay (Truong Duong, h6 Truong Nguy€n Quang Thanh cuu qua trinb bien dang 205 Cu, Pham Thanh Thuj KH qua tinh song va ap Iuc anh B in h , dao san Sa hllong den chan (.img trinh den bien 233 Thanh Y, Tung, Nguy€n L€ Hbng Kim CMu, Thoa Dng dung phuong phap vien tham va h~ thOng tin d!a Iy nghien ellu mc)t so dieu klen t\f nhlen quan dao Truong Sa ~ £uc Thanit Dc}ng l\fe bOi tl,l xoi liJ bo va su thay d6i hinh dang dao san viec 238 T r iin Truong Sa hO 251 " ,.r MOT SO v D~C ,," ,,' ') ",QPONMLKJIHGFEDCB D IE M D IA C H A T D A O S A N H O T R U O N G S A utsrqponmlkjih T n SOME G E O L O G IC C H A R A C T E R IS T IC S TRUONG D li" c ThQ nh **ZYXWVUTSRQPONMLK OF THE S A IS L A N D ABSTRACTrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCB In the Truong Sa island there are late Pleistocene coral limestone, late Pleistocene cemented clastic rocks and Holocene incoherent deposits positive tectonic movement had raised the Since the late Pleistocene island above sea level and caused degradation of the cemented rock layers in the island coastal zone The karst process is strongly developed Along the island coast, the cemented rocks are broken and their cements are dissolved too The side - face and the shape oJ the island are f r e q u e n t ly changed after the tidal periods and the monsoon The island shape is longer (700 x 300 m) ill the season oJ NE monsoon and shorter (650 x 320 m) in the season oJ SW monsoon The phosphate (P 20 S) oJ bird excrement origin is mainly concentrated in the cemented clastic rucks hy mean oJ exchanging permeability Its reserves are about 360,000 tons The underground water is supplied by the rain - water during the whole late Pleistocene - Holocene with reserves oJ abour 846,000 cm The underground water level is frequently increased and decreasrd depending on tidal osciliation day hy day I a * * * Dao san ho Truong Sa, nam toa d(> S039'N va 111°55'E Vaa a phia nam quan daa Truong Sa, co' cac nam 1927, 1930, 1933, cac nha *-* Phan vien Hai duong h9C tai Hai Phong, 93 a khoa hocrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA H3i hoc vien Nha Trang da ti~n hanh khao sat dia hlnh, va cac tau hai quan dia chat dao tren tau khoa hoc De Lanessan Phap K~t qua khao sat duoc cong bo van tat cac thong bao khoa hoc hang nam cua Vien [7] Sau narn 1975, mot so can bO dia chat [2, 4, 9]utsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFEDCBA da co dip d~n khao sat sa bO dao D~n tu lieu da cong bo ve dia chat dao a mire sa luoc Tu thang 11 nam 1988 d~n thang sat dao ve dia mao, dia chat sinh (phong hoa - cax to, dac di~m I D'A pham dong lire ngoai lire boi - xoi be dao), TRAM lap 1,8 m) (hmh h6 * (T 1) da vun 1) DV doan, m [13] Be ngoai thuy bay mot so TICH vi cac lop be mat, Da vtli san cac dia chat tai lieu quy Bai viet trlnh tram tich gap duoc : da voi san ho, da vun tho gan k~t va tram lot dudi toi da khao dao VA TANG Trong chinh rai dia chat 1990, chung D~ Tv, mot so qua trlnh dong van va da thu duoc nhieu nam da mau tho bien tren mat gan ~~t tren loai da xarn, xam san noi ho va nam (dirdi mat gap tdi dO sau den, xu xl bi rong dong vat due khoet, Khi va da co mau trang loai tich vun thoZYXWVUTSR ba them dao gom 30 - 50 tao xam, trang dao barn va due D~c biet da da bi tai sinh calcit dudi dang cac hat nho, vi hat, Nhu v~y, mat bi ngap tren them san ho (hien mire bi~n va duoi tac dong ho sau tia bi hoa tan cua nude va tai k~t tinh trieu) da tung nei cao han mira, aragonit canxit xuong moi trucng axit nhe Da voi san ho co cllu tao khoi hoac 16 hong 'I'ren da ngap trieu, thay ro cac hang hoc vi caxto va bl~U san mat them hien vi thach nhu Cac d~ vun th6 giin ket (T') Chung trang la san ho) (hlnh 94 chinh cua dao ndi, g6m cac lap cat k~t, ·"S~n k~t, cuoi k~t, dam k~t l~n tang nau vang, * tao nen phan xam co ngucn goc tir manh mau va voi sinh vat (chu y~u 1) Ung voi cac ky hieu dia chat thuoc thang T tren hlnh 1, ky hieu dia tang quoc te khong mang y nghla tuoi Da voi san ho Oua ~T'utsrqponmlkjihgfedcbaZYXWVUTSRQPONMLKJIHGFE §T2 Da vun tho gan ~ T Da rang o T4.5 Tram tz=l I OJ ~ I T~ Tam Oat phan Qlllb Oivaa tich tich kel bai cu Olv3b bai hi$n tal Oivac chim Ria them am Duang dang dQ sau (m) iieu sau va tri s6 E zyxwvutsrqponmlkjihgfedcbaZYXW D l- f in h M~tQPONMLKJIHGFEDCBA c a t dla c h a t D E , Cac kip day 0,5 - 0,4 em xen ke tao nen tap day 1,8 - m, vdi d