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首页> 外文期刊>Journal of Asian earth sciences >Sediment dispersal and accumulation in tectonic accommodation across the Gaoping Slope, offshore Southwestern Taiwan
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Sediment dispersal and accumulation in tectonic accommodation across the Gaoping Slope, offshore Southwestern Taiwan

机译：台湾西南近海高坪斜坡构造构造沉积物中的沉积物扩散和聚集

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摘要

Distribution and architecture of slope basins across a continental slope vary as a consequence of accommodation forming, sediment dispersal rates, canyon cutting, sediment filling and different sediment transporting mechanisms. The area offshore Southwestern Taiwan is generally recognized as having active tectonics and high sediment deposition rates. In the Gaoping Slope, slope basins are formed by the developments of folds, faults and diapiric intrusions. Portions of the sediments discharged from the Taiwan mountain belt have been trapped in these basins in the Gaoping Shelf and Gaoping Slope. The rest of the sediments were transported to deep sea areas through submarine canyons. This complex system of folds, faults, diapirs, slope basins, submarine canyons, and sediment deposits has also readjusted the morphology of the Gaoping Slope. This study examines the linkage between accommodation spaces of tectonic and sedimentary processes in the Gaoping Slope through seismic facies analysis. Four seismic facies which include convergent-symmetrical facies, convergent-baselapping facies, chaotic facies, and parallel and drape facies, and different deposition patterns have been recognized in the Gaoping Slope basins. The thick mud layers which are regarded as the source of diapiric intrusions are first observed beneath the basin. Strata records show that the accommodation spaces in various slope basins have increased or decreased during different stages of basin evolution. Because of the competition between regional tectonism (accommodation space variations) and sediment routing distance from provenance to depository (sediment input variations), most under-filled basins lie in the lower slope domain in the Gaoping Slope, but also in the upper slope domain east of the Gaoping Submarine Canyon. This observation suggests that in the inner Gaoping Slope west of the Gaoping Submarine Canyon, sediment deposition rate is higher than the basin subsidence rate, the topography of the upper slope domain there is "healed", and most sediments are overfilled in the slope basins now. Besides the sequential steps of sedimentary disposal in the filling-and-spilling model, we have also observed evidences which indicate that mass movements and submarine canyons in the area have significantly changed the sediment dispersal patterns in the slope basins of the Gaoping Slope. We suggest that although filling-and-spilling is a key sedimentary process in the Gaoping Slope, tectonic activities, mass wasting events and canyon feeding processes have diversified sediment transporting mechanisms from the inner to outer slopes in the area offshore Southwest Taiwan.
机译：陆坡在整个斜坡上的分布和构造由于形成适应区，沉积物扩散速率，峡谷切割，沉积物充填和不同的沉积物输送机制而变化。台湾西南部沿海地区通常被认为具有活跃的构造和较高的沉积速率。在高坪斜坡，斜坡盆地是由褶皱，断层和底辟侵入形成的。台湾高山带排放的部分沉积物被困在高坪架和高坪斜坡的这些盆地中。其余的沉积物通过海底峡谷被运送到深海地区。褶皱，断层，底盘，斜坡盆地，海底峡谷和沉积物沉积物的复杂系统也重新调整了高坪斜坡的形态。通过地震相分析研究了高坪斜坡构造与沉积过程的容纳空间之间的联系。高坪斜坡盆地已经认识到了四个地震相，包括收敛对称相，收敛基底重叠相，混沌相，平行相和悬垂相，以及不同的沉积模式。首先在盆地下方观察到厚泥浆层，这些泥浆层被认为是双底侵入的来源。地层记录表明，在盆地演化的不同阶段，不同斜坡盆地的居住空间都有所增加或减少。由于区域构造（适应空间变化）和沉积物从物源到沉积物的距离（沉积物输入变化）之间的竞争，大多数未充填盆地都位于高坪斜坡的下斜坡域，也位于东部的上斜坡域。高平潜艇峡谷。该观测结果表明，在高坪海底峡谷以西的高坪内坡，沉积物沉积速率高于盆地沉降速率，上斜坡域的地形得到了“修复”，目前大多数沉积物在斜坡盆地中被充填。 。除了在充填-溢流模型中进行沉积处理的顺序步骤外，我们还观察到证据表明该地区的质量运动和海底峡谷已显着改变了高坪斜坡坡盆地的沉积物扩散方式。我们认为，尽管填泥和溢流是高坪斜坡的关键沉积过程，但构造活动，块体消减事件和峡谷给水过程使西南台湾近海地区从内到外的沉积物运移机制多样化。

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