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首页> 外文期刊>Geochimica et Cosmochimica Acta: Journal of the Geochemical Society and the Meteoritical Society >A paired apatite and calcite clumped isotope thermometry approach to estimating Cambro-Ordovician seawater temperatures and isotopic composition
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A paired apatite and calcite clumped isotope thermometry approach to estimating Cambro-Ordovician seawater temperatures and isotopic composition

机译：一种探测Cambro-Ordician海水温度和同位素组成的配对磷灰石和方解石块同位素测温方法

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摘要

The secular increase in delta O-18 values of both calcitic and phosphatic marine fossils through early Phanerozoic time suggests either that (1) early Paleozoic surface temperatures were high, in excess of 40 degrees C (tropical MAT), (2) the delta O-18 value of seawater has increased by 7-8% VSMOW through Paleozoic time, or (3) diagenesis has altered secular trends in early Paleozoic samples. Carbonate clumped isotope analysis, in combination with petrographic and elemental analysis, can deconvolve fluid composition from temperature effects and therefore determine which of these hypotheses best explain the secular delta O-18 increase. Clumped isotope measurements of a suite of calcitic and phosphatic marine fossils from late Cambrian-to Middle-late Ordovician-aged strata-the first paired fossil study of its kind-document tropical sea surface temperatures near modern temperatures (26-38 degrees C) and seawater oxygen isotope ratios similar to today's ratios. (C) 2017 Elsevier Ltd. All rights reserved.
机译：通过早期的磷酸和磷酸盐船舶化石的δO-18值的世俗增加表明（1）早期古生代表面温度高，超过40℃（热带垫），（2）三角洲o -18海水值通过古生代时间增加了7-8％，或（3）成岩作用改变了早期古生代样品的世俗趋势。碳酸块块同位素分析与岩体和元素分析的组合，可以从温度效应中解碳流体组成，从而确定这些假设最佳解释了世俗的ΔO-18增加。从晚寒武纪末期审计和审查的奥陶涅迪师年龄阶层的一套积聚同位素测量 - 第一个配对的化石研究其善良的文档热带海面温度附近的现代温度（26-38摄氏度）和海水氧同位素比率与今天的比例类似。 （c）2017 Elsevier Ltd.保留所有权利。

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