Structural controls on syn-rift sediments of tai 188bet northern song hong basin
Bui Huy Hoang (1), Nguyen Thu Huyen (1), Nguyen Tuan Anh (1), Tong Duy Cuong (1), Bui Viet Dung (1), Nguyen Trung Hieu (1) Nguyen Quang Tuan (1), Nguyen Thanh Tung (1), Trinh Xuan Cuong (2), Hoang Anh Tuan (2), Micheal Fyhn (3), Lars Nielsen (3) Ioannis Abatzis (3), Jussi Hovikoski (3), Mette Olivarius (3) 1.Vietnam Petroleum Institute (VPI); 2.Vietnam Oil and Gas Group (PVN); 3.Geological Survey of Denmark and Greenland (GEUS); Email: huyennt@vpi.pvn.vn
Summary
tai 188bet study area is located in tai 188bet northern part of tai 188bet Song Hong basin which is tai 188bet largest basin along tai 188bet western margin of tai 188bet East Sea stretching from north of Hanoi underneath tai 188bet Song Hong Delta (Red River Delta) into tai 188bet Gulf of Tonkin (Figure 1). tai 188bet rift system underneath tai 188bet Song Hong basin constitutes a world-class example of how extrusion tectonics drives continental rifting and transtensional basin development.
Many factors strongly influence tai 188bet structural styles of rifting of tai 188bet northern Song Hong basin: rifting occurred during later Eocene - Late Oligocene time forced by ASRRSZ left lateral shearing; latest Oligocene - earliest Miocene transpression and inversion brought rifting to a halt, after which left-lateral shearing decreased. Paleogene rift systems extended along tai 188bet trail of tai 188bet ASRRSZ are now outlined by lower to mid-crustal metamorphic core complexes. Rift termination in tai 188bet northern Song Hong basin and exhumation of tai 188bet metamorphic core complexes coincided with cessation of Paleogene rifting along tai 188bet western margin of tai 188bet East Vietnam Sea and a common causal mechanism are speculated.
Structures within rifting affect syn-rift depositional patterns by creating sites of uplift and erosion, by controlling pathways of sediment transportation, by tai 188bet accommodation space for sediment deposition and preservation. These resulting from tai 188bet growth of rifting may yield a tripartite stratigraphy such as fluvial, deep lacustrine and shallow lacustrine.
Key words: Rifting, syn-rift sediments, extension, transtension, lacustrine, fluvial, Song Hong basin.
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