莺歌海盆地岩石圈不同圈层伸展量模拟
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摘要
莺歌海盆地位于印支半岛与南海北部大陆边缘交接区,复杂的地质构造背景使其形成演化的动力学机制成为国内外的研究焦点。利用盆地同裂陷期正演模拟软件STRETCH和盆地裂后期反演模拟软件FLEX-DE-COMP,结合构造精细解释的高品质地震剖面图,对莺歌海盆地岩石圈不同圈层的伸展量进行定量模拟研究,计算出了盆地上地壳、地壳、岩石圈的伸展量,认为它们发生了与深度相关的伸展,上地壳伸展量β值为1.26～1,地壳伸展量β值为2.3～1.1,整个岩石圈伸展量β值为4～1.1。
The Yinggehai basin is located in the juncture area between Indo-China continental block and northern continental margin of the South China Sea.Dynamic mechanism for generation and evolution of the Yinggehai basin has become the debating focus due to its complicated tectonic setting.This paper analyzed the high resolution seismic reflection profiles in this area,and calculated the stretching factor of the upper-crust,crust and lithosphere,using the forward modeling software STRETCH and backstripping modeling software FLEX-DECOMP,suppose the stretch was depth-dependent,the β-factor of upper-crust is between 1-1.26,the β-factor of the whole crust is between 1.1-2.3,and the β-factor of the whole lithosphere is between 1.1-4.
The Yinggehai basin is located in the juncture area between Indo-China continental block and northern continental margin of the South China Sea.Dynamic mechanism for generation and evolution of the Yinggehai basin has become the debating focus due to its complicated tectonic setting.This paper analyzed the high resolution seismic reflection profiles in this area,and calculated the stretching factor of the upper-crust,crust and lithosphere,using the forward modeling software STRETCH and backstripping modeling software FLEX-DECOMP,suppose the stretch was depth-dependent,the β-factor of upper-crust is between 1-1.26,the β-factor of the whole crust is between 1.1-2.3,and the β-factor of the whole lithosphere is between 1.1-4.
引文
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[6]Kusznir N J,Hunsdale R,Roberts A M,et al.Timing andMagnitude of depth-dependent lithosphere stretching on theSouthern Lofoten and Northern Voring continental marginsoffshore Mid-Norway:implications for subsidence and hydro-carbon maturation at volcanic rifted margins[C]//PetroleumGeology:North-West Europe and Global Perspectives-Pro-ceedings of the 6th Petroleum Geology Conference.GeologicalSociety,London,2005:767-783.
[7]Davis M,Kusznir N J.Depth-dependent lithospheric stretc-hing at rifted continental margins[C]Proceedings of NSF Rif-ted Margins Theoretical Institute.Columbia UniversityPress,2004:92-136.
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[2]宋维宇.莺歌海盆地由沉积负载引起的裂后期快速沉降的耦合模式[J].海洋地质动态,2010,26(8):8-14.[SONG Weiyu.Acoupled model incorporating lower-crustal flow in response topost-rift sedimentary load of Yinggehai basin's rapid subsidence[J].Marine Geology Letters,2010,26(8):8-14.]
[3]Baxter K,Cooper G T,Hill K C,et al.Late Jurassic subsid-ence and passive margin evolution in the Vulcan Sub-basin,north-west Australia:Constraints from basin modeling[J].Basin Research,1999(11):97-111.
[4]Driscol N,Karner G.Lower crustal extension across theNorthern Carnarvon basin,Australia:Evidence for an east-ward dipping detachment[J].Journal of Geophysical Re-search,1998(103):4975-4991.
[5]Roberts A M,Lundin E R,Kusznir N J.Subsidence of theVoring Basin and the influence of the Atlantic continental mar-gin[J].Journal of the Geological Society London,1997(154):551-557.
[6]Kusznir N J,Hunsdale R,Roberts A M,et al.Timing andMagnitude of depth-dependent lithosphere stretching on theSouthern Lofoten and Northern Voring continental marginsoffshore Mid-Norway:implications for subsidence and hydro-carbon maturation at volcanic rifted margins[C]//PetroleumGeology:North-West Europe and Global Perspectives-Pro-ceedings of the 6th Petroleum Geology Conference.GeologicalSociety,London,2005:767-783.
[7]Davis M,Kusznir N J.Depth-dependent lithospheric stretc-hing at rifted continental margins[C]Proceedings of NSF Rif-ted Margins Theoretical Institute.Columbia UniversityPress,2004:92-136.
[8]Weissel J K,Karner G D.Flexural uplift of rift flanks due tomechanical unloading of the lithosphere during extension[J].J.Geophys Res.,1989,94:13919-13950.
[9]Wernicke B,Burchifiel B C.Modes of extensional tectonics[J].J.Struct Geol.,1982,4:105-115.
[10]Wernicke B.Low-angle normal faults in the basin and Rangeprovince:nappe tectonics in an extending orogen[J].Nature,1981,291:645-647.
[11]Wernicke B.Uniform-sense normal simple sheat of the conti-nental lithosphere[J].Can.J.Earth Sci.,1985,22:108-125.
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