30(2), 724-729 Tap chi CAC KHOA HOC vg TRAI DAT 6-2008
VE PHA NGHICH DAO KIEN TAO MIOCEN MUON 6 PHAN TAY BAC BON TRUNG SONG HONG
LE TRIEU VIET, TRAN VAN THANG
I. M 6 DAU
Khu vye nghien ciru thuOc phdn TB bdn trung Sdng Hdng (bdn trung Kainozoi ldn nha't tren thdm lue dia Viet Nam). Bdn trung Sdng Hdng cd chidu dai 500-550 km, rOng 220-230 km, bd ddy trdm tieh Kainozoi dat ddn 13-15 km {hinh 7). Qua trinh hinh thanh va phat trien ciia nd da trai qua eae pha (giai doan) phat tridn kidn tao co ban nhu sau : tach md tao dia hao (Eocen- Oligoeen), sut liin manh md rdng pham vi (Mioeen sdm - giiia), nang nen dp tao eae edu true duong (nghieh dao kie'n tao) (cud'i Mioeen) va sut lim binh dn d giai doan cud'i (Plioeen - De Tir). Tuy nhien, eae pha kidn tao neu tren d bdn triing Sdng Hdng xd'y ra vdi quy md va thdi did'm khdng hoan toan triing vdi cae sy kien kidn tao xdy ra d eae bdn trung khae tren thdm lue dia Viet Nam. Vi du, d triing Ciru Long va Malay - Thd Chu, pha nghieh dao kidn tao xd'y ra vao Mioeen giira, cdn d trung Sdng Hdng va Nam Cdn Son lai cbii ydu xdy ra vao Mioeen muOn [2]. Nghien ciru qua trinh phat trid'n kie'n tao cae bdn trung thdm lue dia eho thdy pha nghieh dao kidn tao (pha nang, udn ndp) xd'y ra vao cudi Mioeen d trung Sdng Hdng la ndi bat nha't. He qua ciia pha nen dp la mdt loat ca'u tao duong vdi quy md ldn, nhd trong pham vi giira dirt gdy Sdng Chay va dirt gdy Sdng Ld duge tao ra.
Dd la cac ca'u tao : Ddng Son, Voi, Hai Ydn, Tien Hung, Kie'n Xuong, Tidn Hai, Cay Qua't, Hoa Dao, G, H.... Cac edu tao nay bj cac dirt gdy thuan, nghieh cat qua tao nen kidu kidn true dang "hoa" (flower structure) rdt dae trung. Pha nghieh dao kidn tao nay xd'y ra vao thdi didm gdn triing vdi thdi didm ehuydn ddi chidu chuydn dich : tiir trugt bang Uai sang trugt bdng phai dgc ddi dirt gdy Sdng Hdng.
Bdi vay, nd da thu hiit sy ehu y cila eae nha dia cha't va cung vi the ma cd nhidu nhan dinh, danh gia khae nhau vd thdi did'm ciing nhu nguyen nhan gay ra pha kidn tao nay.
II. DAC TRUNG PHA NGHICH DAO HEN TAO Pha nghieh dao kidn tao xd'y ra manh nha't d khu vyc giira dirt gdy Sdng Chay va dirt gdy Sdng Ld, thudc phdn tay bdc ciia trung Sdng Hdng (triing Ha Ngi tren da't lidn va trung Vjnh Bdc Bd) (hinh 1).
Tren cac mat edt dia cha'n phan xa {hinh 2a, b) thd hien rd cae tbanb tao Kainozoi sdm-giira bi udn ndp, bidn vi, tao nen cac kidn triic dang "hoa nd" vao thdi ky cudi Mioeen. Cung vdi ehiing la cac dirt gdy nghieh : VTnh Ninh, Tidn Hai duge hinh thanh. Cae dirt gdy nay vao thdi ky trude dd (Mioeen sdm- giira) boat ddng nhu nhiJng dut gdy thuan, .song hanh cung qua trinh trdm tich. Theo nhu danh gia ciia [6], bd ddy ldp trdm tich do bi nang len va bj bde mdn d phdn ndc ciia nhidu ca'u tao ed thd dat de'n 1-2 km. Nhidu noi quan sat tha'y trdm tieh tudi Mioeen giira, ed khi ea Mioeen sdm bj bdc mdn.
Tuy nhien, xa hon vd phia trung tam bdn trung Sdng Hdng thi boat ddng nen dp, bde mdn cac tdng trdm tieh tren bidu bien khdng r5 net.
Sau pha (thdi ky) nen dp trpn, khu vyc nghien ciru ehuydn sang pha (thdi ky) ha liin didu boa, binh On vdi sy trdm dgng cae trdm tich hat min tudng bidn ndng tudi Plioeen - De Tir.
Mdt bd't chinh hgp khu vyc duge tao ra giiia cac tdng trdm tich Mioeen va Plioeen- Dd Tir, thd hidn sy khae biet ciia hai chd dd kidn tao xdy ra vdo Kainozoi mudn d bdn trung Sdng Hong.
III. CAC NHAN DINH, DANH GIA VE PHA NGHICH DAO KIEN TAO
Hoat ddng nghieh dao kidn tao, nang nen ep, tao ra cae edu tao "boa nd", "hoa duang"dae biet nhu neu tren d phdn TB bdn triing Sdng Hdng (hay phdn TB vinh Bdc Bd) da thu hiit sy ehu y, quan tam cua cde nha dja cha't. Thd nhung, boat ddng nay 124
TAP CHI
CAC KHOA HOC VE TRAI DAT
Vien Khoa hoc va Cong nghe Viet Nam Tdng bien tap : TRAN TRONG HOA Pho tdng bien tap : NGUYEN VAN GIANG HOi dong bien tap :
Le Due An, Lt Duy Bach, NguySn Van Cu,
NguySn Dinh Duong, Nguyen Dich Dy, Truang Quang Hai, Nguyen Van Hoang, Vu Cao Minh, Trdn Nghi,
Phiing Van Phach, Nguyen H6ng Phuang, Bui C6ng Que, Nguyen Thi Kim Thoa, Cao Dinh Tri^u,
Phan Trong Trinh, Nguyen Dinh Xuyen Bien tap ky thuat: Vu Tu Tie'n
TAP CHI CAC KHOA HOC VE TRAI DAT
30(2) - 6-2008 MUC LUC 1. Ngo Thi Phucmg, Nguyen Viet Y, Pham Thj
Dung, Tran Hong Lam, Hoang Viet HSng Dae die'm dia hoa ciia granat trong ,sa khoang 6 Tay Nguyen 2. Ta Hoa Phuang, DSng VSn Bao, Nguyin VantJOt so gia tri dia chat - canh quan vung cao nguyen da D6ng Van
Vuong, Vu Cao Minh, Pham Van Luc - Meo Vac dap img xay dung cOng vien dia chanh (Geopark) 3. Vu Van Van, Tran Trpng Hoa, A.S. Borisenco, Dae die'm dia chat, thanh phSn va di£u kien hinh thanh kie'u
Ngo Till Phuong, Tran Tuan Anli, Tran Hong Lam, Dang Trung Thuan 4. Nguyen Xuan Cu
5. Le Trieu Viet, Tran VSn Thing
6. Hoa Manh Hung, Nguyen Quang Thanh, Phan Thi Thanh Hang
7. Nguyin Xuan Huyen
8. Pham Nang Vu, Tang Dinh Nam, Nguyen Duy Binh
9. Doan VSn Tuyen, Oinh Van Toan, Trinh Viet Bac
10. Le Huy Minh, Pham Xuan Thanh, Nguyen Chien ThSng, TriSn Thi Lan, R. Fleury, P. Lassudrie Duchesne, A. Bourdillon, C. Amory Mazaudier, Tran Ngoc Nam, Hoang Thai Lan ILTran Dinh To
12. Cao Dinh Trieu, S. Tatiana
13. Nguyin Hong Phuong, Pham The Truyen
khoang boa thaeh anh - vang - bae khu virc Trang Sim (Tuy Hoa, Phii Yen)
Anh hirdng ciiaCu, Pb, Zn den sinh truong va tich luy chiing trong rau xalaeh
Ni pha nghieh dao kie'n tao Mioeen muOn a phSn tay bdc bOn trung SOng H6ng
DOng lire phat trie'n vung eiia .sOng Hau (Ciia Dinh An - Tranh De) Nirt sut da't huyen Thanh Ba : hien trang, nguyen nhan va co ehe
hinh thanh
Ca'u true dia cha't va boat dOng kie'n tao hien dai khu vire thanh phd Dien Bien
Nghien ciru ngudn dia nhiet cho phat trie'n nang luong saeh 6 Viet Nam
Danh gia quan he giira ham luong hoi nu6c khi quye'n va dO chinh xac dinh vi tuyet ddi bang GPS 6 Viet Nam
Chuye'n d6ng hien dai vo Trai Da't viing Son La qua ke't qua do GPS MO hinh ca'u triie van tde song doe P eiia Manti khu virc DOng
Nam A
Danh gia kha nang bi tdn thuong do dOng da't cho thanh phd Ha NOi
97 105
113 119 124 130 136 147 153
161 170 176 185
1 r Hinh l.Sado kie'n triie viing triing Sdng Hdng
va gidi ban pham vi nghien curu xiy ra vao thdi did'm ndo, tac nhan lidn quan hay nguyen nhan nao hinh tbanb nen nd la cau bdi khdng de tra ldi. Vi vay ed nhidu nhan dinh, danh gia khae nhau xung quanh va'n dd nay.
Mdt didu de nhan tha'y la sy kien nen ep nay xdy ra trong pham vi boat ddng ciia ddi durt gdy Sdng Hdng, eu thd trong pham vi boat ddng cua diit gdy Sdng Chay va Sdng Ld (thude ddi dirt gdy Sdng Hdng), ndn tac nhan ddu tien cac nha nghidn ciru thudng nghT de'n la boat ddng cila ddi dirt gdy Sdng Hdng.
Nghien ciru tinh cha't boat ddng eua ddi durt gdy tren, cdng trinh [71 cho la pha boat ddng trugt bang trai gay bidn dang cua ddi dirt gdy nay da kdt thuc trude 16-17 tr.n. Theo danh gia cua [15] khi nghien eiru ddi diirt gdy Sdng Hdng, boat ddng cua nd duge phan thanh hai pha : pha boat ddng tach
gian do trugt bang trai xay ra ttr Oligoeen ddn cud'i Mioeen sdm (ttr 36-15 tr.n) va pha nen dp trugt bang phai xd'y ra vao cud'i Mioeen mudn - ddu Plioeen (7-8 de'n 5,5 tr.n); hoat ddng trugt bang ddi chidu tir trai sang phai xd'y ra vao ddu Mioeen mudn, cdn giiia vd sau cae pha kidn tao, ddi dirt gdy khdng boat ddng va ndm d chd dd "chd". Cdng trinh [10] cho rang ttr 15-5,5 tr.n dirt gdy boat ddng ydu va bd'i canh dia ddng lye (dgc theo ddi dirt gdy) "la thdi ky san bang, tao bd mat san bang tudi Mioeen mudn. Hoat ddng trugt phai eua dirt gdy Sdng Hdng xd'y ra sau 5,5 tr.n".
Theo cdng trinh [12], "tidp theo pha cang gian la sy nen dp xdy ra vao khoang 23-5,5 tr.n ciing vdi sy nghieh dao nguge chddd dich chuydn ttr ngang trdi sang ngang phai. Nghieh dao kidn tao d phdn TB bd trdm tieh (triing Sdng Hdng) dat di'nh didm vao khoang 11-5,5 tr.n.
Theo cdng trinh [3], "ttr cudi Mio- een mudn ddu Plioeen boat ddng tach gian duge thay thd bang hoat ddng nen dp, lam xua't hien dirt gdy [151 chdm nghieh. Qua trinh nghjeh dao
kie'n tao xdy ra vao giai doan 15,5- 5,5 tr.n, manh nha't vao 10,5-5,5 fr.n.
Tai phdn trung tam bd trdm tich, qua trinh nghieh dao kidn tao xdy ra manh me vdi tde dd nang khoang 60-70 m/tr.n va bd ddy ldp trdm tich bj bdo mdn ed 300-350 m. Day chinh la bang chiing cho tha'y anh hudng eiia nghjeh dao kidn tao va sy djeh chuydn ngang phai dgc theo ddi diit gdy Sdng Hdng". Vdi y kie'n gdn tuong ty vay, cdng trinh [14] nhaii manh
"boat ddng nen dp do trugt bang trai (pha mudn) xdy ra vdo khoang 10,5 tr.n, manh me vd rdng khdp, tao nen nhihig ndp ud'n va chdm nghjeh bien dd ldn trong giiia ddi dut gdy Sdng Chay va Sdng Ld.
Bang ehirng cho chidu ehuye'n ddng trai eiia pha nen dp nay Id su trung khdp cua phuong keo ddi cae dirt gdy thuan vd nghieh vdi sy sdp xdp ciia cac dirt gdy va ud'n ndp pha buy eiia eo chd trugt bang trai theo md hinh eua Sylvester (1988). Bdt chinh hgp 5,5 tr.n danh da'u didm kdt thue eua pha nen ep nay.
125
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Hinh 2a. b. Mat edt dia cha'n thd hien cae trdm tich trudc Plioeen (trudc 5,5 tr.n) bi bidn vj, ud'n ndp tao tbanb ea'u tao dang "hoa" d phdn trung Sdng Hdng [15]
Danh gid vd nguydn nhdn gay ra pha nghjeh dao Mioeen giiia va manh trong Mioeen mudn. Trudng kidn tao, cdng trinh [2] dd cap nhu sau : "Sy hiit chim ap lye ciia Bidn Ddng da ehuye'n ddi tir cang gian ciia vi mang dai duang Bidn Ddng xud'ng dudi eung chidm uu thd sang ddn ep la ehu yd'u. Cud'i Mioeen Lu.son - Dai Loan theo mang sau Manila da day mudn, sy ddn dp phd bidn va manh nhdt trong eae cung Luson vd phia tay va tao cae ap lye ddn dp ttr bd Dd Tam trdn ria Tdy Bid'n Ddng Viet Nam va da
ddn tdi sy hinh thanh eae he dirt gdy nghjeh vd hang loat edu tao vdm ed kich c9 khae nhau ttr rdt ldn ddn trung binh va nhd". Cdn cdng trinh [9] giai thich sy hinh thanh ea'u triic dang hoa duong va nghieh dao kie'n tao d trQng Sdng Hdng (ria TN ?) la hau qua eiia sy nen dp phuong DB-TN kbi hgp phdn tach gian (d giai doan trude) duge thay thd bang hgp phdn nen dp cung phuang (d giai doan sau) trong tidn trinh dich ehuydn trugt bang trdi (trong khoiing thdi gian 20-15 U.n trudc) eiia ddi dirt gdy Sdng Hdng khi khd'i Ddng Duong trugt vd DN. Hoat ddng dich phai eiing cho la xdy ra trong khoang 15-5,5 tr.n. va qua trinh nghieh dao chidu ehuydn ddng nay (djch phai) trd nen thd'ng trj tren toan bd dirt gdy sau 5,5 tr.n. tren da't lidn.
IV. BAN VE THdl DIEM, NGUYEN NHAN GAY NGHICH DAO KIEN TAO
Tir nhirng nhan djnh, danh gia ddn ra d tren thd bien mOt didu la da ,sd nha nghien eiru nha't tri eho pha nghjeh dao kidn tao xdy ra vao Mioeen muOn (ttr 10,5-5,5 tr.n). Didu nay duge thd hien ro net tren ra't nhidu mat edt dja ehdn thu duge d bon triing Sdng Hdng vdi mdt ba't cbi'nh hgp khu vuc ed tudi la 5,5-5,3 tr.n. Nhu vay, pha nghieh dao kidn tao xd'y ra vdo cudi Mioeen va kdt thiie trude ngudng Plioeen, khdng vugt sang Plioeen nhu cae cdng trinh [3, 9, 11] da nhan djnh. Ndu ehdp nhan nhu vay, ranh gidi vdi tudi 5,3-5,5 tr.n trude irng vdi thdi didm chuydn ddi ehd dd dja ddng luc, tue la thdi did'm suy ydu eiia hoat ddng trugt bang trdi (ndu sat trudc thai did'm dd trugt bdng trai edn tdn tai) vd la thdi didm khdi ddu ciia hoat dOng trugt bdng phai eiia ddi dirt gdy S6ng Hdng. Ndu ta cho trugt bdng phai bat ddu sdm ban (ttr Mioeen mudn) nhu cac cOng trinh [3, 7, 9] nhan djnh, .se khd giai thich vd ddng lye bgc. Bdi trong ciing mdt xu the trugt bdng phai thudn tuy (sudt ca khoang thdi gian Mioeen mudn - Plioeen - De Tir va khdng ed tac nhan khae lien quan), khd cd thd xd'y ra hien tugng ndng nen dp tao ed'u true hoa duang vdi cac trdm tieh d phdn dinh cac edu tao bj bidn vj, bao mdn manh liet va ngay sau dd la pha binh dn kidn tao, boat ddng sut liin nhiet dd tao ra tdng trdm tieh Plioeen - De Tii vdi sy phan ldp ngang nam phii chdm, khdng bi bidn vj (hinh 2a,b). Ttr suy luan nay, ed thd thdy hoat dOng nghjeh dao kidn tao ehi keo dai ddn hdt Mioeen mudn, tire la ddn 5,5-5,3 tr.n. each ngay nay, vd pha nghjeh dao kidn tao ndu tren khdng thd la hau qua eiia boat ddng trucrt bang phai dgc ddi dirt gdy Sdng Hdng.
Bay gid ta xet lieu pha nghjeh dao tren cd phai la hau qua eiia chuydn djch trugt bang trai hay khdng ? Theo nguyen ly hinh thanh cac ddi dirt gdy nghjeh, nghieh chdm va eae ea'u tao ud'n ndp cdn phai cd lye ndn dp tae ddng theo phuong vudng, hoae gdn vudng gde vdi phuong true eiia cac cdu tao {hinh 3). Trong trudng hgp cu thd, cac ea'u tao "hoa duong" va cac dut gdy nghjeh thudng cd true keo dai song song vdi ddi dirt gdy Sdng Hdng, tire la ed phuang TB-DN ; hudng nghieng cua eae dirt gdy nghieh thudng d6 vi TN. Vay phuong nen dp tao ra chiing (ca cdu tao duong vd dirt gdy) phai Id phuang DB-TN hoac gdn nhu vay. Ttr cac mat cat eho ta suy luan : phuang lye nen dp nay la rdt manh (tao cac dirt gdy nghieh) vd ndu nhu vay, nd se can trd boat dOng trugt bdng trai ndu boat dOng dd edn tdn tai. Trong sd cac dirt gdy nghjeh thi dirt gdy VTnh Ninh thd hien tinh chdt nghieh ro nhdt. Bien dd dich chuydn dimg ciia dirt gdy nay len ddn hang tram met. Ndu nhu ehi do anh hudng trye tidp ciia qua trinh trugt trai thudn tuy cua ddi durt gdy SOng Hdng ma eae edu tao nghjeh cQng duge tao ra thi khd giai thich vd mat ddng hgc : tac nhan nao da gay ra sy ehuyen ddi tinh cha't ciia nd tir mdt diit gdy thuan dang boat ddng ddng trdm tich trong thdi gian trude dd, lai ehuydn ngay sang dii't gdy nghieh trong eung mdt chd dd (dich trugt trai).
Tir day suy ra boat ddng nghjeh dao kidn tao neu tren eiing it cd kha nang la hau qua eiia hoat ddng trugt bang trai dgc ddi dirt gdy Sdng Hdng.
Didu ndy ciing phti hgp vdi nhan djnh ciia [8, 12|
la vao khoang thdi gian dd ddi dirt gdy Sdng Hdng da ngtmg trugt trai.
Tim bidu nhan djnh ciia [2] vd nguyen nhan gay ra pha nghieh dao (da ddn ra d tren), chung tOi cho rang day la mdt nhan djnh thu vj, dang suy ngdm.
Tuy nhien, tham khao nhidu tdi lieu d khu vye ria B-DB Bidn Ddng - noi bi anh hudng trye tidp cua ddi hut chim doe mang sau Manila, chiing tdi khdng tim tha'y ddu hieu eiia pha nghjeh dao kidn tao vao cud'i Mioeen mdt each that tin tudng (cd nhung ra't md nhat). Them vao dd, hudng lye tae ddng dd ed thd tao ra eae edii true nen ep d phdn TB triing Sdng Hdng ciing khdng that phu hgp (chua thuydt phue). Tir nhirng nhan dinh tren cho thdy ly giai nguyen nhan gay ra pha nghjeh dao kie'n tao mOt each thoa dang la rdt khd va chua dii co sd.
Vd phia chung tdi, tuy mdi ehi la dy kidn ban ddu va cdn ed them nhimg eir lieu dd minh ehirng, xin manh dan neu ra dd cting thao luan.
127
Hinh 3. Phan bd' call true chdm nghieh trong ddi trugt bang [4]
Vao Mioeen mudn, do tac ddng hdi tu sau ban eiia Indostan vdi mang Au A va sy dang trdi eua chum na'm (plume) Manti dudi gdm thach quydn Ddng Duong. Hau qua keo theo lam phan di giira cac khd'i kidn tao, thiie ddy sy dao chidu chuydn djeh giiia cac canh ciia cae be thd'ng dut gdy tdn tai trude dd, lam he thd'ng dirt gdy kinh tuydn gia tang boat ddng (dae biet diit gdy kinh tuydn 110) Uugt bang phai (va vd sau niia kem theo boat ddng phun trao basalt), gia tang tae ddng nen dp trong cac ldp trdm tich gdn bd mat va gay nghjeh dao kidn tao dgc cae ddi dut gdy (Sdng Chay, Son La, Sdng Ca, kinh tuydn 107,...), ndi chung, dgc cac dirt gdy d phdn bidn cua khd'i Ddng Duong va ria nam khdi Nam Trung Hoa va hd qua tidp theo tao ndn mdt loat cae edu tao "hoa nd" trong khu vyc nghidn cuu.
KET LUAN
Tir nhirng didu trinh bdy tren cho phep di de'n kdt luan, pha nghjeh dao kie'n tao d phdn tdy bde bdn trung Sdng Hdng xd'y ra vao cud'i Mioeen vd kdt thiic trude Plioeen. Nguyen nhan ddn ddn hien tugng tren do sy dang trdi ciia chum narn Manti dudi gdm thach quydn Ddng Duong song hanh ciing vdi sy hdi tu sau ban ciia mang An Uc vao Au A kem theo sy nen dp len hudng DB. Ke't qua lam phan dj manh cac khdi kie'n tao dgc cac he thd'ng durt gdy, thiic ddy boat ddng dao chidu eua chiing va gay bid'n dang cae ldp trdm tich gdn bd mat dgc theo ehung, dae bidt manh d dgc cac hd thd'ng dirt gdy phuang TB - DN thude phdn ria (tidn duydn) cua khd'i Ddng Duong va khdi Nam Trung Hoa.
Cdng trinh duge hd trg kinh phi ciia chuong trinh nghien cim co ban, giai doan 2006 - 2008.
Cac tae gia bdy td ldng cam on.
TAI UEU DAN
[1] D 6 BAT, NGUYEN THE HUNG, NGUYHM QUY HUNG, N G 6 XUAN VINH, D 6 VIET HIEU, NGUYfiN TRUNG HIEU, NGUYfiN NGOC, 2001 : Trdm tich De Tam va vi tri dja tdng lien quan ddn bidu hien ddu khi thdm luc dia Viet Nam. Tuydn tap bao cao HN KHCN "Vien Ddu khi : 25 nam xay dyng va trudng tbanb", iS7-iS7,
[2] PHAN TRUNG DIHM, PHAM VAN TIEM, NGO THl/CJNG S/N, 2000 : Mdt sd' bie'n cd' dia cha't Mezo- zoi mudn - Kainozoi va he thd'ng ddu khi tren thdm luc dia Viet Nam, BC HNKHCN 2000 :"Nghanh ddu khi Viet Nam trudc thdm thd ky 21".
[31 DOAN THE HUNG, 2000 : Anh hudng hoat ddng ddi dirt gdy Sdng Hdng ddn qua trinh hinh thanh va phat trid'n ciia bd' trdm tich Sdng Hdng.
Cac cdng trinh nghidn cOru Dja cha't va dja vat ly bid'n, tap VI.
[4] A.V. LUKIAMOV, 1965 : Nhiing bidu hien cdu true eua ehuydn djeh ngang vd Trai Da't, Cdng trinh eiia Vien nghien eim Dja cha't, Vidn Han Lam KH Lien Xd (cQ) (Nga van).
[5] TRAN NGHI, TRAN HUTJ THAN, DINH XUAN
THANH, NGUYfiN TH/NH LAV, PHAM NGUYfiN HA VU, NGUYfiN HOANG SON, 2004 : Tidn hoa trdm tich Kainozoi mudn bdn trung Sdng Hdng trong md'i quan hd vdi boat ddng dia ddng lye. Trong saeh : Ddi dirt gdy Sdng Hdng : "Dae die'm dia ddng lye, sinh khoang va tai bidn thidn nhien", Nxb KHvKT, Ha Ndi, 373- 409.
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SUMMARY
About the Late Miocene tectonic inversion phase in Northwestern part of Bacbo gulf
The article deals with the Late Miocene tectonic Inversion phase in Northwestern part of Bacbo gulf.
This tectonic inversion has formed the "flower stmctu- res" of different size (due to the reverse and normal faults transected the uprising structures). There are different opinions about the age and reason of this tectonic phase. Based on analysis of geological sections, discontinuities in Cenozoic basins and comparison with the geological data on land of this region as well, the authors supposed that this tectonic event have occurred in Late Miocene and ceased up to Pliocene, The reason of this tectonic phase could be the result of the Indian - Eurasia collision, affected and compressed the mantle dome under the Indochina block,
Ngdy nhgn bdi: 21-9-2007 Vien Dia chdt
(Vien Khoa hgc vd Cdng nghe Viet Nam)
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