STRETCHING FACTOR MODELING OF LITHOSPHERE FOR DIFFERENT LAYERS IN YINGGEHAI BASIN
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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-DECOMP,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。Abstract: TheYinggehai 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.
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Key words:
- depth-dependent stretch /
- quantitative model /
- stretching factor /
- Yinggehai basin
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