The sedimentary record of Quaternary glacial to interglacial sea‐level change on a subtropical carbonate ramp: Southwest Shelf of Australia
The sedimentary record of Quaternary glacial to interglacial sea‐level change on a subtropical carbonate ramp: Southwest Shelf of Australia
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亚热带碳酸盐坡道第四纪冰期至间冰期海平面变化的沉积记录：澳大利亚西南陆架
DOI：
10.1111/sed.12793
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发表时间：
2021
期刊：
影响因子：
3.5
通讯作者：
Maria-Angela
中科院分区：
文献类型：
--
作者：
Reuning;Courtillat;Margot;Petrick;Benjamin;Bassetti;Maria-Angela
在过去的几十年里，人们对温带碳酸盐系统的了解有了很大的提高，但与热带碳酸盐系统相比，对它们在冰期-间冰期时间尺度上的发展仍然研究不足。一个关键的问题是，温带碳酸盐平台如何应对高幅度的冰期-间冰期海平面变化？综合海洋钻探计划地点U1460是在澳大利亚西南大陆架最上面的斜坡上钻探的，位于亚热带Carnarvon斜坡和暖温带罗特尼斯特大陆架之间。利用X射线衍射仪、扫描电子显微镜和光学显微镜研究了U1460海底以下25米表层沉积物的来源和组成。综合大洋钻探计划站点U1460的中更新世至全新世层序记录了海平面控制的沉积旋回。间冰期海平面高位(海相同位素阶段1、5、7、9和11)沉积的碳酸盐沉积物主要为细粒(<lt；63µm)，以浮游有孔虫等远洋生物碎屑中的低镁方解石为主。相反，冰川低水位段(海洋同位素2至4、6、8、7d、10和12期)颗粒较粗，相对富含文石和来自浅海生物碎屑(如苔藓虫)的高镁方解石。这些结构、矿物学和成分的变化最好的解释是在冰川海平面低水位期间靠近陆架边缘的浅海生物碎屑的沉积。在早期海侵期间，富含生物碎屑的海岸沙丘沉积的再加工可能导致浅海碎屑在上坡的迁移和再沉积。相比之下，在间冰期高峰期，台地边缘的沉积以远洋沉积物为主。这些结果突显了温带碳酸盐系统对海平面变化响应的区域差异：以前发表的从大澳大利亚湾为早更新世温带碳酸盐开发的模型表明，陆架物质在海平面高位期间输出到上坡。认为这种差异与中更新世转换前后冰期-间冰期海平面旋回的持续时间和幅度变化有关。
In the last decades, the understanding of temperate carbonate systems has improved considerably, but their development over glacial–interglacial timescales is still understudied in comparison to their tropical counterparts. A key question is how do temperate carbonate platforms respond to high‐amplitude, glacial–interglacial sea‐level changes? Integrated Ocean Drilling Program Site U1460 was drilled at the uppermost slope of the Southwest Shelf of Australia at the transition between the subtropical Carnarvon Ramp and the warm–temperate Rottnest Shelf. The origin and composition of the sediments in the upper 25 m below seafloor at Site U1460 were investigated using X‐ray diffraction, scanning electron, and light microscopy. The Middle Pleistocene to Holocene sequence at Integrated Ocean Drilling Program Site U1460 contains a record of sea‐level controlled sedimentary cycles. Carbonate sediments deposited during interglacial sea‐level highstands (Marine Isotope Stages 1, 5, most of 7, 9 and 11) are mainly fine‐grained (<63 µm) and dominated by low‐Mg calcite from pelagic bioclasts such as planktic foraminifera. The glacial lowstand intervals (Marine Isotope Stages 2 to 4, 6, 8, 7d, 10 and 12), instead are coarser‐grained and relatively rich in aragonite and high‐Mg calcite from neritic bioclasts, such as bryozoans. These changes in texture, mineralogy and composition are best explained by the deposition of neritic bioclasts closer to the shelf edge during glacial sea‐level lowstands. During early transgression, reworking of bioclast‐rich coastal dune deposits likely leads to transport and redeposition of neritic clasts on the upper slope. In contrast, dominantly pelagic sediments characterize deposition at the platform edge during interglacial highstands. These results highlight regional differences in the response of temperate carbonate systems to sea‐level change: A previously published model developed for early Pleistocene temperate carbonates from the Great Australian Bight indicates that shelfal material was exported to the upper slope during sea‐level highstands. It is argued that this difference is related to the change in duration and amplitude of glacial–interglacial sea‐level cycles before and after the Mid‐Pleistocene transition.
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影响因子：
3.5
作者：
J. Rivers;T. Kurt Kyser;N. James
通讯作者：
J. Rivers;T. Kurt Kyser;N. James
15. 数据报告：大澳大利亚湾 ODP 段 182、站点 1127 的散装和细碎碳酸盐中更新世晚期氧和碳同位素地层
DOI：
--
发表时间：
2002
期刊：
影响因子：
--
作者：
Carbon Isotope;M. Andres;J. Mckenzie
通讯作者：
J. Mckenzie
晚更新世海平面变化、碳酸盐台地形态与霰石产量的关系（马尔代夫、印度洋）
影响因子：
3.5
作者：
Reijmer;Fürstenau;Kinkel;Betzler
通讯作者：
Betzler
影响因子：
2
作者：
N. James;L. Collins;Y. Bone;P. Hallock
通讯作者：
N. James;L. Collins;Y. Bone;P. Hallock
上新世晚期-更新世早期，内陆架，亚热带，以海草为主的碳酸盐岩：鱼子钙质岩，大澳大利亚湾，西澳大利亚
DOI：
--
发表时间：
2007
期刊：
影响因子：
--
作者：
N. James;Y. Bone
通讯作者：
Y. Bone