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The initiation of the southern central Great Barrier Reef: New multiproxy data from Pleistocene distal sediments from the Marion Plateau (NE Australia)

机译:南部中部大堡礁的形成:来自马里恩高原(澳大利亚东北部)的更新世末世沉积物的新多代理数据

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摘要

Significant synchronous shifts in the chemistry, mineralogy, grain sizes and color of the sediments at 6 m below sea floor (mbsf) at ODP Site 1195 on the Marion Plateau (NE Australia) are interpreted to reflect a major regional paleoceanographic change: the initiation of the southern province of the Great Barrier Reef (GBR). The onset of this massive carbonate production centre nearby resulted primarily in increased deposition of carbonate-rich sediments of neritic origin. Both sedimentation rate and terrigenous input record a coincident decline attributed to inshore trapping of materials behind the reefs. Our best estimate places the development of reef framework in the southern part of the GBR between 560 and 670 kyr B.P., based on an age model combining magnetostratigraphic and biostratigraphic data. The proposed estimation agrees with previous studies reporting an age between 500 and 930 kyr B.P., constraining more tightly their results. However, it does not support research placing the birth of the GBR in Marine Isotope Stage (MIS) 11 ( approx 400 kyr), nor the theory of a worldwide modern barrier reef development at that time.
机译:在马里高原(澳大利亚东北部)ODP站点1195的海床以下6 m(mbsf),沉积物的化学,矿物学,粒度和沉积物颜色的显着同步变化被解释为反映了主要的区域古海洋变化:南部大堡礁(GBR)省。附近巨大的碳酸盐生产中心的出现主要是由于增加了富含碳酸盐的沉积物的沉积。沉积速率和陆源输入都记录了同时发生的下降,这归因于近海在珊瑚礁后面的物质捕获。根据结合磁地层学和生物地层学数据的年龄模型,我们的最佳估算是将GBR南部的礁岩构架发展于560至670 kyr B.P.。建议的估算值与以前的报告(年龄为公元前500至930年)的研究相吻合,从而更加严格地限制了他们的研究结果。但是,它不支持将GBR的诞生置于海洋同位素阶段(MIS)11(约400年前)的研究,也不支持当时世界范围内现代屏障礁发展的理论。

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