Structural controls on syn-rift sediments of kèo nhà cái 188bet northern song hong basin
Summary
kèo nhà cái 188bet study area is located in kèo nhà cái 188bet northern part of kèo nhà cái 188bet Song Hong basin which is kèo nhà cái 188bet largest basin along kèo nhà cái 188bet western margin of kèo nhà cái 188bet East Sea stretching from north of Hanoi underneath kèo nhà cái 188bet Song Hong Delta (Red River Delta) into kèo nhà cái 188bet Gulf of Tonkin (Figure 1). kèo nhà cái 188bet rift system underneath kèo nhà cái 188bet Song Hong basin constitutes a world-class example of how extrusion tectonics drives continental rifting and transtensional basin development.
Many factors strongly influence kèo nhà cái 188bet structural styles of rifting of kèo nhà cái 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 kèo nhà cái 188bet trail of kèo nhà cái 188bet ASRRSZ are now outlined by lower to mid-crustal metamorphic core complexes. Rift termination in kèo nhà cái 188bet northern Song Hong basin and exhumation of kèo nhà cái 188bet metamorphic core complexes coincided with cessation of Paleogene rifting along kèo nhà cái 188bet western margin of kèo nhà cái 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 kèo nhà cái 188bet accommodation space for sediment deposition and preservation. These resulting from kèo nhà cái 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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