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Tuygn tap bao c^o Hgi nghj KHCN "30 nSm Dau khi Viet Nam Co'''' hdi mdi, thach thiic mdi'''' 469 MOI TRironVG LANG DONG, TlTOOVG T R A M TICH VA TtT^NG H t r u C O TRONG THCJI KY MIOCEN SCM OLIGOCEN MUON TR[.]
Tuygn tap bao c^o Hgi nghj KHCN "30 nSm Dau Viet Nam: Co' hdi mdi, thach thiic mdi' 469 MOI TRironVG LANG DONG, TlTOOVG T R A M TICH VA TtT^NG H t r u C O T R O N G THCJI KY M I O C E N SCM - O L I G O C E N M U O N T R E N M O S i r TLr DEN, LO 15.1, BE CUtJ L O N G Chu Dire Quang Viin Ddu Khi TOM TAT Phdn tieh bdo tu phdn vd tu&ng hiru eo la cdng cu m&i nhdm xdc dinh chinh xdc hi thdng ldng dong trdm tich trin co s& su dung thdnh phdn vgt chdt hiru co chua da trdm tich Phuong phdp ndy Id td hgp cdc phucmg phdp phdn tich trdm tich, bdo tuphdn vd thdnh phdn mdnh vgt chdt hiru eo Bdi bdo trinh bdy thdnh phdn mdnh vdt chdt hiru co ciia trdm tich dugc thdnh tgo mdi truong luc dia vd viing chuyin tiip, vd phdn logi chiing cung nhu gid tri % thdnh phdn tir phdn tich mdu trdm tich mat cdt giing khoan Viec dp dung phdn tich tu&ng bdo tuphdn bao gdm gidi thich hda thgch bdo tu phdn vd thdnh phdn mdnh vdt chdt hiru co cho cdc trdm tich thudc hi tdng Bgch Hd (Miocen s&m), Trd Tdn (Oligocen mudn) vd Trd Cu (Oligocen s&m) thudc bi trdm tich Cu-u Ldng, thim luc dia Viet Nam Gidi THIEU Nghien ciiu phan vat chat hiiu CO da tram tich duge thuc hien bang phan tich tuong hiru co (palynofacies) tren CO so phan loai phan manh palynomaceral Phan loai phAn palynomaceral dua tren eo sor dac tnmg vat ly ve cau tnic, hinh dang, kich thuoc (lan khoang 200am, trung binh khoang 100am va nho khoang 50am), n6i, cau (tot, trung binh va xau) va chgn lge (tot, trung binh va xau) ma chiing ta quan sat chiing bang kinh hien vi sinh vat bang anh sang thau quang Phan tich tuong htru CO (thanh phan, binh thiic, v.v.) co thi tim hieu dugc moi lien quan vol moi truong lang dgng tram tich jlXi'N'J.i.K ^\a-\cvi\^:f Hinh 1: Vi tri dia ly mo Su" Tu Den, 16 15.1 Cac kilu tuong hihi co (Palynofacies types) dac trung cho moi truong luc dja - vting chuyin tilp din biin khoi dugc phan chia lam 15 kilu tuong (Hinh 2) Trong mat cAt trAm tich Miocen som - Oligocen 16 15.1, be Cim Long chimg lien quan din cac moi truang trAm tich sau: - M6i truong biin ven bo day yen tinh (kilu I va II) - Moi truong vung vjnh kin (kilu XIII) 470 Moi tru-ong ling dong, tudng tram tich va tudng hiJu co thoi ky Miocen sdm - Oligocen - M6i truong dam ho (kieu XII) - M6i truang dAm lAy ven s6ng bien (kieu XV) Moi truang s6ng (kilu XI, XV, VII VIII) se snarei siriiin T&ig hop mfli tn/dng D3c!J\/ng hC*j co '!l ?^ ra; cao c i a SCM, onat cru.3ng s j i g song an In sang UV Le^spnasdadia sdn va oao tCr 1^6 bt4n StWdog xyyiSn Tfung ! i m 06 vOi ds6u lo6n icn xy T" i^ SOM S'tBig Dnn, n%arri nCfu CO i-3 icc*i riiCdc nho Kndng prvat q u a i g rt**n gap vo Ki^ne fofajTBirfa-a ^k*^' IV ^ ^ \ ?*•• r^^*"y^^ ;.#-' A- •**•" • i»:l^- ^ Ocs Di^n srong v a anri noang ir&i « n v^ tang d»6u to^n n i ^ u d xy day Knoa &/• va eae rioa m^a^ ndi Miac cung v a m a i n ^lLru co loai kicfi rtudc nho v^ mecroptanlc«on cTis^m uUtnS a ^ n v>en od lijii n d n g 9dt Cac rioat ddng ddng c n i ^ f*i6 o dav o»^n t^iitaSu nijfii cc III, nrs/ng tfiam p»i,an maf*i IYIAJ CO toai 2-3 tacri irR/oc nno tang tdn Bk^n ven Bd ItAj n d n g idt vdi hoat ddng ddng cnay m o d day Ce^n B>6n ven Dd lUU aidng Kit vdi ddng cTiay nho noat ddng Manri tx/u co loa -2 (ueri trn/dc ldn cnnSm IAJ iri6 day £pt^ Td nc^ Ciia maan huCrco ioai nk^ ifiubc Edn, siu-odg tua dugc t>ao tdn tdt vdi MvDa tilvli nda BiacnnuCroa ioat v ^ O o ^#iiS ^ f l p niicf