ISSN 1859 - 3070 Cac cong trinh nghien ciru Dja chat va Dja vat ly bien. Tap XI
VAI TRO CUA CAC HOAT
D Q N GKIEN TAO NEN EP PHUONG DB-TN TRONG TIEN HOA CAU TRUC CUA BE SONG HONG - VINH BAG BO
Phung Idn Phdch, Trdn Tudn DTing, Nguyen Thi Thu fliivng.
Phi Trudng Thdnh, Bid Viet Dung
TOM TAT
Bi trdm lich Kainozoi Sdng Hdng - Vinh Bdc Bd Id be trdm lich cd khdi luong tram tich lan nhdt Irong sd cdc bd trdm tich Kainozoi trong pham vi them lue dia Viet Nam. Bd cd hinh dang dvan. vdi chieu ddi tren 500 km, chieu rdng khodng 50-60 km.
Cdc nghien eicu eho thdy cdu true cua be bao gdm 2 phdn khdc biet: phdn Tay Bdc cd ciiu tnic phicc lap, bao gdm Mien Vdng Hd Ndi (hay Dia hdo Hd Ndi) chiem phdn lan dien lich chdni tho Sdng Hdng vd mot phdn bien ndng ven bd ddng bdng Bdc Bd. Phdn Ddng Nam cua be trdm lich Kainozoi Sdng Hdng - Vinh Bdc Bd bao gdm mot mien sut bin lan, lien tuc Irong Kainozoi. Cdc nghien eicu cua chung Idi eho Ihdy hoat ddng kien Igo h4iocen Giua-Mudn, vdi cdc nen ep phicang DB-TN manh me, cd vai trd qiiyet dinh trong viec hinh thdnh nen cdu true phdn di cua be trdm tich.
L M O D A U
Vdn de hinh thanh va tien hda ciia bg tram tich Kainozoi Song Hong - Vinh Bae Bg tir lau da thu hiit su chii y ciia nhieu nha khoa hgc trong va ngoiii nude, nhu:
Andersen C. et al (2005), Biii Thi Thanh Huygn va nnk (2005), Clift Peter D. et al (2006), He LiJLian et al (2002), Jolivet, L. et al (1999), Le Trigu Viet va Trdn Van Thdng (2008), Leloiip, P.H. et al (1995), Nguyen Hiep va nnk (2007), Nguyen Manh Huyen va Hd Ddc Hoiii (2006), Nguygn Qudc Cudng et al (2009), Nguygn Trgng Ygm (1991), Nielsen L.H et al (1999), Phan Trgng Trinh va nnk. (1995), Phan Tning Dign vci Phan Quynh Anh (2005), Phung Van Pkach (2001), Phung Van Phach, Bui Cong Que (1999), Phiing Van Phach, Vu Van Chinh (2007), Phiing Van Phach (1996), Phiing van Phach (2007), Pubellier M. et al (2003), Rangin C. et al (1995), Tapponnier P.et al (1995), Tapponnier, P. et al (1990), Tapponnier, P. et al (1986), Trdn Huu Than va nnk (2005), Ying Don (Xudong) (1994), Zhen Sun et al (2003)...[1,2, 3,4, 5, 6 , 7 , 9 , 10, 11, 12, 14, 15, 16, 17, 18, 19, 2 0 , 2 1 , 2 2 , 2 3 , 2 4 , 2 5 , 26, 27, 29] Trong dd sir tdn tai pha nghich dao kign tao Miocen Giiia-Mugn, vdi sir hinh thanh cac kign tnic nen ep, dang cao, sau dd bi bdc mdn cat cut manh me, la mot van dg van cdn nhigu digm chua dugc lam sang td. Muc dich ciia bai bao nay la lam sang to dac digm cac ddng lire gay ngn pha nghjch dao kign tao va nguon gdc ciia cac ddng lire dd. Qua dd giiip eho ngudi dgc hieu rd hon vg su tign hoa ciia be tram tich Sdng Hdng-Vinh Bae Bd, cung nhu nguygn nhan ciia su phan di cau tnic giii'a khu virc Tay Bae va phan Trung Tam cua be tram lich nay. Cac ket luan se cd ich eho cdng tac lim kiem tham dd khoang siin, dac biet la dau khi.
Cac cone trinli nghien ciru Dia chat \'a Dia \at ly bien. Tap XI ISSN 1859-3070_
II. VE CAU TRUC KIEN T.40 BE SONG HONG
Bg trdm tich Song Hong -Vinh Bae Bd la mot cau tnic Kainozoi Idn nhdt khu \uc thgm luc dia \'iet Nam \'a lan can, co hinh dang ovan, vdi chigu dai tren 500 km, chigu rgng 50-60 km. Bg day trdm tich Kainozoi theo cac tai lieu dia vat ly dat tren 15 km.
Khdi lugng trdm lich khong Id, ldp day bg Sdng Hdng - Vjnh Bae Bd la minh chimg eho mot thdi ky rdt ddi dao nguon vat lieu cung cap eho bg, ma theo Clift Peter D. et al (2006) [3] la do Sdng H6ng trong qua khir tirng cd mot liru vue Idn hon ngay nay rat nhigu, bao g6m mot phan Idn thugng luu song Hoang Ha, sdng Duong Tir, va ca sdng Mg Cong.
Khoi lugng Idn tram tich trong giai doan Oligocen-Miocen dugc dua den khu vue be Sdng Hong-Vinh Bnc Bd, chae chan da gdp phan dang ke, thiic day qua trinh liin chim a da)'. Tir dd cd ihg thay, ngoai cac nguygn nhan kign tao, nhu su dich tru'gt dgc ddi dirt gay Idn Song Hong, su xoay theo chieu kim ddng hd ciia dia khdi Ddng Duo'ng, lao nen sut lun be tram tich Song Hong-Vinh Bae Bd trong Kainozoi, thi su chat tai tram tich cung dong gdp dang kg eho sy kin chim. Dieu thudng xay ra ddi vdi cac bg tram tich Kainozoi cd ngudn \ at lieu cung cap doi dao, tdc do king dgng tram tich Idn.
a) b)
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Hinh 1: a) Cdu true bg trdm tich Sdng Hdng-Vjnh Bdc Bd (tac gia Phiing Van Phach va Phi Tnrdng Thanh, 2005, tren ca so ban dd dang day trdm tich Kz)
b) Su bien ddi luu vue cac con sdng Idn d Chau A (theo d a r k e r 2004)
Tuy nhien moi tuong tac giua cac qua trinh dudi sau va chuyen ddng kign tao moi la cac >eu td chinh tao ngn sut lim be Sdng Hong-Vjnh Bdc Bd. Trong qua trinh cang dan cua Thach Quygn, tai nhirng noi xung yeu se hinh thanh cac cdu true rifta vdi cau tnic co chay dign hinh. Cdu tnic cd chay lam eho vd Thach Quygn mdng di' Phia trgn vo bi tach va keo doang ra, tao digu kien eho cac vat lieu trdm tich bdi l4n
ISSN 1859 - 3070 Cac cong trinh nghien ciru Dja chat va Dja vat ly bien. Tap XI
vao dd. Phia dudi cac \'at lieu thugng manti don Ign, dg bit vao su mat can bang dang tinh (do vd bj dan ra, va do trdm tich ldp vao do nhe hon nhigu, cd lap day ciing khdng thg lap lai thg can bdng ddng tTnh). Trong khi do dudi cac be tram tich, vd Trai Dat mdng di dang kg va bj chia cat bdi hang loat cac dirt gay thuan. Qua trinh lign hoa cua be tram tich nguon rift phu thuoc co ban \'ao su bien ddi lau dai ciia hai yeu Id: vd nidng-yeu di-bi hun ndng + thuc/ng manti ddng len vd ngudi di.
Trong qua trinh phat trien tiep theo, tai viing cau tnic cd chay tiep tuc xay ra hai hien lugng song hanh: dd la phan vo phia tren cd chay (trung tram tich) \'bx\ da bj am Ign tir dau, lai cang ndng Ign trong qua trinh cac tram tich bi chdn viii, de xudng.
Ngugc lai d phan phia dudi, vat lieu manti trong qua trinh dang Ign da bi ngudi di dang ke, lam eho nd trd ngn cirng chae va ben vung hon. Houseman G. va England P.
(1986) eho rang qua trinh sut lim-tach dan giai doan tao rift se tu dgng dirng lai (self- limiting) vao thdi digm khi ma vat chat manti thugng, d dudi trung tam tach dan trd ngn du eii'ng. Kgl qua la da tao acn mdi thg can bang ddng rat nhay >.am. The can bang dd phu thude nhieu vao tinh chat co ly eiia vd va tdc do keo doang trong tign trinh tao rift [Kusznir and Park, 1987, Sender and England, 1989].
Do.cac bg tram lich vdn dl la nhung no'i ygu nhat ciia Thach Quygn nhu vay, nen nd cung dg dang bj nghjch dao khi cd cac luc bgn ngoai tac dgng. Ddi vdi bg tram tich Sdng Hdng -Vjnh Bae Bd hoat ddng kign tao la nguyen nhan chinh gay ngn cac chuygn dgng nghich dao trong giai doan Miocen Giua-Mudn, thg hien ro net trong cac tang tram tich. Va cung chinh cac hoat ddng do da tao ngn dien mao cau tnic kien lao ciia bg Hdng -Vjnh Bae Bg ngay nay, vdi phan Tay Bae bi vd nhau udn nep kha manh, tao ngn loat cac dja hao, dja liiy keo dai theo phuong TB-DN tren dia phan Mign Vdng Ha Ndi va vimg bign ndng ven bd chau thd Sdng Hdng. Cac hoat dgng ciia pha nghjch dao nhu vay chii yeu thg hien manh a phan ria Tay Bae, va mot so d ria Tay Nam (lai phu bg Hug), Cling nhu d ria Ddng Bae (gan khu vue dao Bach Long VT). Trons; khi do phan dien lich rdng Idn la Trung Trung Tam ciia bg lai chii ygu chiu sir sut lui lign kie tir Oligocen dgn nay. Cac mat cat dia chan thu dugc trong qua trinh tim kiem- tham dd dau khi da chi ra mot each sinh ddng cac can tnic nghjch dao.
Cac nghign ciru vg can tnic tram tich, cau triic sau, dac digm dja dgng luc, dac digm dja mao... ciia bg tram tich Song Hong - Vjnh Bae Bd kr cac lai lieu thuc tg va tham khao cac tai lieu da cdng bo tren cac tap chi trong va ngoai nude da eho phep chung tdi thanh lap ban dd Cau tnic kign tao va Dja ddng lire bg trdm tich Sdng Hdng- Vjnh Bae Bd. Trgn ban dd nay ranh gidi cua mign cd bigu hien nghjch dao kign tao chinh d phia TB, vdi cau tnic Tning Tning Tam lan dau tign dugc chiing tdi thg hien mot Ccich rd net, vdi mot quan digm dja dgng lire nhdt quan (Hinh 2).
Cau tnic bign dang thiigc phan TB dirge ngan each vdi phdn Tning Trung Tam Vinh Bdc Bd bdi ddi dut gay phuong a kinh krygn Ddng Son - Quan Lan, cd kigu trugt phai.
ISSN 1859-30"ii Cac cong trinh nghien cmiDia chat xa Dja vat ly bien. Tap XI
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Hinh 2: Ban dd Cau tnic kign tao va Dja ddng luc bg trdm tich Sdng Hdng - Vjnh Bdc Bd (thanh lap bdi Phiing Van Phach va nnk. 2008, chinh sira bd sung 7-2010)
ISSN 1859-3070 Cac cong trinh nghien ciru Dja ch5t va Dia vat ly bign. Tap XI
III. HO.VT DONG NEN EP MIOCEN G I L T A - M U O N VA NGHICH DAO KIEN TAO BE SONG HONG-VINH BAG BO
Bii'de vao Miocen Giii'a bat dau cd cac bigu hien cua hoat dgng nghjch dao kien lao. Dieu niiy the hien rd net trgn cac mat cat dja chan thu dugc tu cong tac tham dd tim kiem dau khi, cung nhir tren cac vet 16 da Oligocen-Miocen d mot so noi trgn dat lien, nhu d Ha Long, hd Dai Lai, Viet Tri, Trung Ha, dgc Sdng Hong, song Ld, song Chay... Neu nhir tren cac mat cat dja chan chiing la thay ro dugc miic do bien dang va tudi cua cac hoat ddng kien lao, nhung lai kho xac djnh dugc cac dac digm dja dgng kre ciia cac pha kign lao, thi trgn cac vgt Id d dat lign lai ngugc lai: d dd cd thg xac djnh chinh xiic dac digm ciia eae pha bien dang, vdi viec khoi phiic lai chinh xac cac hgp phan chinh ciia trudng irng siiat kign tao, cac ii'ng suat phap chinh: 5|, 62 va 63. Tii' do CO the xac djnh dugc hudng cua cac lire tac ddng chinh ciia pha kien tao.
Kgl hgp hai kieu tai lieu chiing ta co the xac dinh dugc kha chinh xac dac diem dja ddng lire cac hoat ddng kign tao: khi nao xay ra va xay ra nhu thg nao. Trong tmdng hgp cu thg ciia bg Sdng Hdng -Vjnh Bae Bg chiing tdi da rat thanh cdng trong ITnh vue niiy, diic biet la ddi vdi pha nghjch dao kign tao. Cac bang ehirng eho thay pha kign tao Miocen Giiia - Muon cd kigu nen ep manh, vdi cac: nen ep cue dai djnh hudng theo phuang DB-TN.
Chang han tcai khu vue cau Tning Ha (bae qua doan ha luu sdng Da) cac da Miocen la cac cueii ket, sdi kel, cat kgt bj tac dgng bdi mot luc kien tao nen ep theo phuang DB-TN rat ro net, bigu hien bdi su chuygn djch dgc cac mat dirt gay kign tao ciia cac tang danh dau, hay cac hdn cudi bj cat qua va chuygn djch. Tat ca dgu phan anh trudng luc pkuong DB-TN (Hinh 3).
Ngoai ra d day con cd thg quan sat dugc hien tirgng cac trdm tich co Trial la cac da set than chdm tnrgt len tren cac da Miocen trc han, cd xu hudng lam khep lai dia hao dgc ddi dirt gay Sdng Hdng.
Cac chuygn djch vdi nen ep theo phuong DB-TN cdn cd thg quan sat d nhigu nai dgc din gay Song Hdng, Sdng Chay, dac biet tai cac trung nhu Ygn Bai, Bao Yen. Tai dau cau Ygn Bai cac dirt gay thuan ddng tram tich phuong TB-DN (song song vdi dirt gay Sdng Hdng) bj pha nghich dao lam dao ngugc, tao ngn the ndm nhu dirt gay nghjch (Phiing Van Phach, 1999) [17].
ISSN 1859 -30'(i Cac cong trinh nghien ciru Dja chit \ a Dia vai Iv bien. Tai-wan X I
Hinh 3: Bigu hien cua pha nen DB-TN tai digm Id da Miocen lai dau cau Tnmg Ha:
A) Loat cac mat dirt gay phuong a kinh tuyen lam djch trugt cac ldp da cat-sdi kgt theo kigu trug't phai, mot each he thdng, vdi bign do ngang 20-40 cm. Ddng thdi hang loat cac hdn cuoi Idn ciing bj cac mat nirt a kinh tuyen cat qua va lam trugt phai, phan anh phuong nen DB-TN.
B) Mot sd hdn cudi lai bj cac nut phuang DB-TN cat qua va gay chuygn djch theo kieu thucin- tach, phan anh phuo'ng nen DB-TN.
C)Vi tri vgt Id Trung Ha, vdi dja hao hep cac tram tich Miocen, bj cac tram tich Trial chdm trugt Ign theo dut gay Sdng Hdng.
Tai khu vue dao Bach Long VT, ngoai klioi Vjnh Bdc Bd pha kign tao vdi phuang nen ep DB-TN thg hien rd net, vdi viec lam djch tnrgt cac mach da cat kgt dgc theo cac dii't gay phuong a vT tuygn theo kigu djch trai, ddng thdi cung lam eho cac dii't gay phuong DB-TN hoat dgng theo kigu thuan rd net, bign do chuygn djch kha Idn, dat tdi hang met (Hinh 4, 5).
Cac chuygn djch manh me theo phuong ngang va cac nghjch dao, tao cac cdu triic nen ep dang ngp udn dgc theo dut gay VTnh Ninh, dut gay Sdng Chay dgu phan anh pha nen ep DB-TN va eho thdy cd su djch chuygn manh me theo mot ddi dirt gay phuong a kinh tuygn (dii't gay Ddng Son-Quan Lan). Dirt gay do cd vai trd phan each phan TB bign vj nghjch dao manh cua bg Sdng Hdng-Vjnh Bflc Bd va phan sut lun lign kic o trung tam Vjnh Bdc Bd.
_ac cong trinh nghien cirii Dia chat \ a Dja vat ly bien. Tap XI ISSN 1859-3070
Hinh 4: Hinh anh djch trugt trai-nghjeh ciia he dirt gay phuang TTB-DDN trgn dao Bach Long VT, phan anh pha tnrgt bang-nen ep, vdi phuang nen DB-TN (anh Phiing
Van Phach chiip thang 11-2006).
Su chuygn djch ciia dja khdi phia tay ddng bang Bae Bd trugi len phia bae dong bae ciing dugc minh chiing d mot loat cac dia digm ven ria Bae Bg va ven bien Bae Tmng Bd, tuy la trong cac da trudc Kainozoi. Chang han tai bai bien Da Nhay (tinh Quang Binh) cd thg thay rd cac ngp udn chdm vay, kem theo cac mat trugt vet xude phan anh nen DB-TN manh me trong cac da Trial (Hinli 6).
Hinh 5a: Anh minh hoa cap cac diit gay thuan cam ngugc nhau tai digm BLV21, phia TB dao Bach Long VT. Dirt gay chinh (I) cd phuong vj 346<60 do, vdi \ et \udc thuan
la 306<55 do, phan anh tach gian phrrong TB-DN, trong boi canh nen cue dai DB-TN (anh Phimg Van Phach chup thang 1 1-2006).
ISSN 1 8 5 ' ) - 3 ( r Cac cong trinh nghien ciru Dja chat va Dja veil ly bit^n. J T j p ^ ^
Hinh 5b: Binh dd \ a mat cdt ddi dirt ga}' thuan o' sudn TB dao Bach Long M (digm khao sat BL\'21). phan anh kigu tach dan TB-DN do pha nen ep DB- TN sav ngn
Hinh 6: Hinh anh cac ngp udn chdm
\ay kliu \arc bai bign Da Nhay-Ly Hoa (Quang Binh), do cac nen ep phuong DB-TN tao ngn. Digm khao sat LHOl (anh Phiing Van Phach, 2006).
IV. KET LUAN
Cac nghign ciru cua chimg toi xe pha nen ep Miocen Giira-Mudn eho phep di dgn nhung ket luan sau:
1) Pha kign tao Miocen Giiia-VIudn xay ra d phan ria TB cua bg Sdng Hdng- Vjnh Bae Bd do cac lire kign tao vdi phuong nen cue dai DB-TN gay nen, la ddng luc gay ngn cac hoat dgng nghjch dao kign tao trong bg Sdng Hdng-Vjnh Bae Bd, vdi su hoat ddng tich cue theo kieu tmgt phai cua he dirt gay phuang a kinh tuygn Ddng Son- Quan Lan.
2) Ddi dut gay phuong a kinh tuygn Ddng Son-Quan Lan la ranh gidi chinh ngan each phan TB bj bign x\ nghjch dao manh me xai phdn DN sut kin dn djnh trong su6t thdi gian hinh thanli \a phat trign bg trdm tich Sdng Hdng-Vjnh Bdc Bd.
TAI LIEU THAM KHAO
1. Andersen C , Mathiesen A., Nielsen L. H., P. V. Tiem, H. I. Petersen and P.
T. Dien, 2005. Distribution of source rocks and maturity modelling in the Northern Cenozoic Song Hong Basin (Gulf of Ton Kin). Vietnam. Journal of Petroleum Geology: Xo\. 28 (2). Apnl 2005. pp 167-184.
2. Bin Thj Thanh Huygn. "I'asuhiro Yamada. Toshifumi Matsuoka, 2005.'Qua trinh phat trign cau true cua phan bae bg Sdng Hdng trgn co so minh giai tai lieu dia chan. Tuyen tap bdo cdo hoi nghi KHCN- 30 ndm Ddu khi Viet Nam. Nha XBKHKT, Ha Ndi. Tr.239-250.
ISSN 1859 - 3070 Cac cong trinh nghien ciru Dja chat va Dja vat ly bien. Tap XI
3. Clift Peter D. and Zhen Sun, 2006. The sedimentary and leclonic evolution of the Yinggehai-Song Hong basin and the southern Hainan margin. South China Sea:
Implications for Tibetan uplift and monsoon intensification. Journal of Geogfsical Research. Vol.111. B06405, doi: 10.1029/2005JB004048.
4. He Lijuan, Liangping Xiong, Jiyang Wang, 2002. Heal flow and thermal modeling of the Yinggehai Basin, South China Sea. Teclonophysics 351. Pp. 245-253.
5. Jolivet, L., Maluski, H., Beyssac, O., Goffe, B., Lepvrier, C , Thi. P.T., Vuong, N.V., 1999. Oligocene-Miocene Bu IChang extensional gneiss dome in Vietnam: geodynamic implications. Geology 27, 61- 70.
6. Lg Trigu Viet, Tran Van Thang, 2008. Vg pha nghjch dao kign tao miocen muon d phan Tay Bae bdn trung Sdng Hdng. Tap chi Cdc Khoa hoc ve Trdi Ddt, 2(T.20). Tr. 124-129. Nha XB KHTN va CN.
7. Leioup, P.H., Lacassin, R., Tapponnier, P., SchaE rer, U., Dalai, Z., Xiaohan, L., Liangshang, Z., Shaocheng, J., Trinh, P.T., 1995. The Ailo-Red River shear zone (Yunnan, China), Tertiary transform boundary of Indochina. Teclonophysics 251, 3±88.
8. Nguygn Giang Vu, 2003). Nhirng van dg vg tign trinh phat trign cau tao Id 102 va 106 d bg Sdng Hdng lign quan dgn tigm nang dau khi. Tuyen tap bdo cdo Hoi nghi KHCN Vien Ddu khi 25 ndm .\dy dung vd trudng thdnh. Nha XBKHKT. Ha Ndi.
Tr.283-309.
9. Nguygn Hiep and et al, 2007. Sach Tai nguygn dau khi XTet Nam. Nhd xudt bdn KHKT. 549 trang.
10. Nguyen Manh Huygn, Hd Dac Hoai, 2006. Bg trdm tich Sdng Hong va tai nguyen dau khi. Chuo'ng 7, sach Dia chdt vd tdi nguyen dau khi Viet Nam. Tr. 187-240.
11. Nguygn Qudc Cudng, Antoni K. Tokarski, Anna Swierczewska, Witold Zuchiewicz & Nguyen Trong Yem, 2009. Late Tertiary tectonics of the Red River Fault Zone (Vietnamese part) based on studies of sedimentary rocks. Proceeding of Viet Nam -Poland Workshop on Tectonics of the Red River Fault Zone and Geologv of Northern Vietnam. The I Olh Anniversaiy of Scientific Research cooperation between Vietnam and Poland on geology 1999-2009. Ha Noi-Sa Pa, Nov.2009. Pp.50-87.
12. Nguygn Trgng Ygm, 1991. Tnrdng irng sudt Tan kign tao triing Sdng Hdng.
Dia chdt -Tdi nguyen. NXB KHKT. Ha Noi.
13. Nielsen L.H., Mathisen A., Bidstrup T., Veybaek O.V., Dien P.T., Tiem P.V, 1999. Modelling of hydrocarbon generation in the Cenozoic Song Hong Basin, Vietnam: a highly prospective basin. Journal of Asian Earth Sciences 17. 260-294.
Elsvier Science Ltd.
14. Phan Trgng Trjnh va nnk, 1995. Kien tao Kainozoi Tay Bdc Viet Nam. Hoi nghi KHKT Dia chdt Viet Nam Idn line 3. Tap 1. Ha Ndi. Trang 137 - 147.
Cac cong trinh nghien ciru Dja chat va Dja vat ly bien. Tap XI ISSN 1859 - 3070
15. Phan Trung Dign, Phan Quynh Anh, 2005. Tdng quan vg he thdng bg De Tam trgn ria lay Bign Ddng Viet Nam. Tuyen tap bdo cdo hoi nghi KHCN- 30 ndm Ddu khi Viet Nam. Nha XBKHKT, Ha Ndi. Tr. 104-123.
16. Phung Van Phach, 2001. Tectonic strucUire of the Red River fault zone.
Journal of Geology, No-17-18/2001, Hanoi-Vietnam (in English)..
17. Phung Van Phach, Bui Cong Que, 1999. Late Cenozoic Tectonic activities in North Vietnam. Journal of Geology, 73, Hanoi-Vietnam (in English).
18. Phiing van Phach, Vu Van Chinh, 2007. Cac pha bign ddng trong Kainozoi d bon tram tich Sdng Hdng va phu can. Tap chi Khoa hoc vd Cdng nghe Bien. Sd 3(T7)/2007. Tr. 18-30.
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SUMMARY
The Role of tectonic activities with NE-SW compression in structural evolution of Red River - Tonkin gulf basin (North Viet Nam)
By Phung Van Phach, Tran Tuan Dung, Nguyen Thi Thu Huong, Phi Truong Thanh, Bui Viet Dung
Red River Cenozoic Basin appeared to be the largest Cenozoic basin in the Vietnam continental shelf. It has a rhombic (or oval) shape, striking NW-SE, approximately 500 km long and 50-60 km wide. The stucture of the Basin consists of two distinguished parts: the NW part composes of Hanoi trough, which occupies most area of Red River delta and adjacent shallow water zone. This part is quite complex in the structure; The SE part of the Basin show large subsiding Cenozoic basin. Our researh shows that the Middle to Late Miocene tectonic activities, with strong NE-SW compression, has played inportant role in the creation of such differential structural parts of the Basin.
Ngudi sira bai: TS. Nguyln Van Luang Vien Dja chat va Dja vat ly bign, Vien KH&CN Viet Nam