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首页> 外文期刊>Tectonophysics: International Journal of Geotectonics and the Geology and Physics of the Interior of the Earth >Structure and sediment budget of Yinggehai-Song Hong basin, South China Sea: Implications for Cenozoic tectonics and river basin reorganization in Southeast Asia
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Structure and sediment budget of Yinggehai-Song Hong basin, South China Sea: Implications for Cenozoic tectonics and river basin reorganization in Southeast Asia

机译：南海英格海-宋红盆地的结构和沉积物收支：对东南亚新生代构造和流域重组的启示

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摘要

The temporal link between offshore stratigraphy and onshore topography is of key importance for understanding the long-term surface evolution of continental margins. Here we present a grid of regional, high-quality reflection seismic and well data to characterize the basin structure. We identify fast subsidence of the basin basement and a lack of brittle faulting of the offshore Red River fault in the Yinggehai-Song Hong basin since 5.5 Ma, despite dextral strike-slip movement on the onshore Red River fault. We calculate the upper-crustal, whole-crustal, and whole-lithospheric stretching factors for the Yinggehai-Song Hong basin, which show that the overall extension observed in the upper crust is substantially less than that observed for the whole crust or whole lithosphere. We suggest that fast basement subsidence after 5.5 Ma may arise from crustal to lithospheric stretching by the regional dynamic lower crustal/mantle flow originated by collision between India-Eurasia and Indian oceanic subduction below the Eurasian margin. In addition, we present a basin wide sediment budget in the Yinggehai-Song Hong basin to reconstruct the sedimentary flux from the Red River drainage constrained by high-resolution age and seismic stratigraphic data. The sediment accumulation rates show a sharp increase at 5.5 Ma, which suggests enhanced onshore erosion rates despite a slowing of tectonic processes. This high sediment supply filled the accommodation space produced by the fast subsidence since 5.5 Ma. Our data further highlight two prominent sharp decreases of the sediment accumulation at 23.3 Ma and 12.5 Ma, which could reflect a loss of drainage area following headwater capture from the Paleo-Red River. However, the low accumulation rate at 12.5 Ma also correlates with drier and therefore less erosive climatic conditions. (C) 2015 Elsevier B.V. All rights reserved.
机译：离岸地层学与岸上地形之间的时间联系对于理解大陆边缘的长期地表演化至关重要。在这里，我们展示了一个区域高质量反射地震和井数据的网格，以表征盆地结构。尽管在陆上红河断层发生了右旋走滑运动，但我们仍认为自5.5 Ma以来，莺歌海-宋洪盆地盆地基底快速沉陷，而缺乏红海断层的脆性断裂。我们计算了莺歌海-宋洪盆地的上地壳，全壳和整个岩圈伸展因子，这表明在上地壳中观测到的总体伸展比在整个地壳或整个岩石圈中观测到的要小得多。我们认为5.5 Ma之后的快速基底沉降可能是由于印度洋-欧亚大陆和欧亚大陆边缘以下印度洋俯冲之间碰撞引起的区域动态下地壳/地幔流引起的，从地壳到岩石圈的伸展。此外，我们提出了莺歌海-宋洪盆地的全流域沉积物预算，以重建受高分辨率年龄和地震地层数据约束的红河流域的沉积通量。沉积物积累速率在5.5 Ma时急剧增加，这表明尽管构造过程变慢了，但陆上侵蚀速率却增加了。如此大量的泥沙供应填补了自5.5 Ma以来快速沉降所产生的容纳空间。我们的数据进一步突显了沉积物在23.3 Ma和12.5 Ma处的两个显着急剧下降，这可能反映了从古红河捕获水源后流域面积的减少。但是，在12.5 Ma处的低累积率也与较干燥有关，因此侵蚀性气候条件较少。 （C）2015 Elsevier B.V.保留所有权利。

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