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Evolution of a Maastrichtian-Paleocene tropical shallow-water carbonate platform (Qalhat, NE Oman)

机译:Maastrichtian-Paleocene热带浅水碳酸盐岩台地(Qalhat,NE阿曼)的演化

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摘要

The biostratigraphy (larger foraminifers, dasycladaleans), microfacies, sedimentology, and geochemistry (delta C-13, strontium-isotope stratigraphy) of a continuous, 148-m-thick section of shallow-water platform carbonates that contain the Cretaceous/Paleogene (K/P) boundary were analyzed. The boundary is constrained within a 7-m-thick interval, between the last occurrence of Maastrichtian larger benthic foraminifers and the first occurrence of Danian benthic foraminifers. Although this interval is intensively dolomitized, there is no sedimentological evidence of a major hiatus at the K/P boundary. The correlation of bulk rock delta C-13 values with stable isotope data from DSDP Site 384 (NW Atlantic Ocean) supports this interpretation and indicates a Selandian age for the top of the section. The Qalhat section is a unique example of a carbonate platform that has recorded persisting open marine environmental conditions across the K/P boundary (Maastrichtian-Selandian), as indicated by the abundance of rudists, larger benthic foraminifers (Maastrichtian), calcareous algae and scleractinian corals.
机译:生物地层学(较大的有孔虫,dasycladaleans),微相,沉积学和地球化学(δC-13,锶-同位素地层学)是一个连续的,厚度为148-m的浅水平台碳酸盐岩剖面,其中含有白垩纪/古生界(K / P)边界进行了分析。在最后一次出现的马斯特里赫特大型底栖有孔虫与第一次出现的达尼安底栖有孔虫之间,边界被限制在7米厚的区间内。尽管这个间隔是强烈白云石化的,但没有沉积学证据表明在K / P边界存在主要裂隙。散装岩石δC-13值与DSDP 384号站点(西北大西洋)稳定同位素数据的相关性支持了这种解释,并指出了该段顶部的塞兰德年龄。 Qalhat剖面是碳酸盐岩平台的一个独特示例,它记录了整个K / P边界(Maastrichtian-Selandian)持续存在的开放海洋环境条件,如大量的鲁迪斯人,较大的底栖有孔虫(Maastrichtian),钙质藻类和Scleractinian珊瑚。

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