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首页> 外文会议>Symposium on Kimberley marine and coastal science >Geological Setting, Marine Geomorphology, Sediments and Oceanic Shoals Growth History of the Kimberley Region
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Geological Setting, Marine Geomorphology, Sediments and Oceanic Shoals Growth History of the Kimberley Region

机译：金伯利地区的地质环境，海洋地貌，沉积物和海洋浅滩增长史

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The offshore sedimentary basins of the Kimberley region are becoming established as a major hydrocarbon province, but the region is also known for its marine wilderness values. Its position close to a plate boundary is reflected in significant rates of continental margin subsidence. In addition to the "normal" continental margin geomorphic units of shelf, slope and rise the offshore Kimberley region has well developed plateaux (e.g. Scott Plateau), terraces (e.g. Rowley Terrace), and banks (e.g. Sahul rise, Sahul bank) which interrupt the otherwise gentle seaward slopes present, and provide foundations for the offshore reefs, including the Sahul shoals, Ashmore, Seringapatam, and Scott Reef and the Rowley Shoals. The continental shelf is a vast low gradient ramp with sandy bioclastic sediments reflecting both the modern biota and a history of past sea level and oceanographic changes, so that sediments are a mixture of modern bioclasts, particles stranded by sea level rise, and precipitated carbonate grains (ooids and peloids) which were dominant prior to Leeuwin Current onset some 12,000 years ago. Whilst little is known about the nearshore fringing reefs, in areas of macro-tides and significant sediment input, the morphology, internal architecture and growth history of reefs and shoals of the Oceanic Shoals Bioregion indicates that these are long-lived features which have survived despite relatively high rates of continental margin subsidence and oscillating sea levels of the Pleistocene glaciations. However, drowning by sea level rise was the fate of some of the reefs and shoals of the Sahul Shelf, situated at the leading edge of the downturning Australian Plate, in contrast to continuing reef growth at Scott Reef and the Rowley Shoals to the south. In the morphological series provided by the three Rowley Shoals, differential subsidence is the primary control on rates of lagoon infill controlling platform morphology. This study demonstrates the resilience of reefs on the subsiding margin whilst linking reef morphology to the relative amount of pre-Holocene subsidence.
机译：金伯利地区的离岸沉积物正在成为一个主要的碳氢化合物省，但该地区也以其海洋荒野价值观所知。它接近板边界的位置反映在大陆边缘沉降的显着速率。除了“正常”的大陆边缘地貌形状单位，坡度和崛起的海上金伯利地区已经发达了平原（例如Scott Plateau），露台（例如Rowley露台），以及中断的银行（例如Sahul崛起，Sahul Bank）其他温柔的海滨山坡，并为海上珊瑚礁提供了基础，包括Sahul Shoals，Ashmore，Serizapatam和Scott Reef和Rowley Shoals。大陆架是一种巨大的低梯度坡道，含有含有现代生物群和过去海平面和海洋变化的历史的含沙生物粘性沉积物，使沉积物是现代生物燃料的混合物，海平面上升和沉淀的碳酸盐颗粒（黄液和蛋白）在Leeuwin目前在大约12000年前开始占主导地位。虽然很少有关于近岸环绕珊瑚礁的近海雷丁和大量沉积物投入，但海洋浅层的礁石和浅滩的形态，内部建筑和生长史表明这些是尽管幸存下来的长寿特征相对较高的大陆边缘沉降率和振荡海绵冰川的海平面。然而，海平面上升溺水是Sahul架子的一些珊瑚礁和浅滩的命运，位于澳大利亚澳大利亚州的下端，与斯科特礁岛和罗德利浅滩上的南部持续的珊瑚礁增长相反。在三个罗利浅滩提供的形态系列中，微分沉降是泻湖填充控制平台形态的主要控制。本研究表明，在将Reef形态联系到预全线沉降的相对数量，返回珊瑚礁的恢复力。

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