Compilation and time-series analysis of a marine carbonate delta O-18, delta C-13, Sr-87/Sr-86 and delta S-34 database through Earth history
Compilation and time-series analysis of a marine carbonate delta O-18, delta C-13, Sr-87/Sr-86 and delta S-34 database through Earth history
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发表时间：
2008-03
影响因子：
12.1
通讯作者：
A. Prokoph;G. Shields;J. Veizer
中科院分区：
文献类型：
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作者：
A. Prokoph;G. Shields;J. Veizer
海洋碳酸盐的Sr、S、O和C同位素数据库包含55，000多个已发表的低镁方解石同位素值，这些方解石来自成岩作用轻微蚀变的古生代化石贝壳以及奥陶纪至太古代的全岩和方解石胶结物样品。壳材料的碳和氧同位素数据被划分为栖息地子集（高，中，低纬度和深海），整个岩石数据被矿物学分离成方解石/白云石子集。通过对高斯滤波后的同位素记录进行趋势分析、相关分析、小波分析和谱分析，发现并量化了时间记录中的相似性和模式，结果表明：在过去的115 Ma中，来自“高纬度”和“深海”栖息地的氧同位素趋势几乎无法区分，这与“海洋传送带”的存在相一致;所有的氧同位素栖息地记录显示，相干30-45 Ma（类似于38 Ma）的旋回性贯穿整个白垩纪和新生代，最近115 Ma的6180记录中的百万年变率可以用以下方程模拟：δ O-18（千分之一）= 0.64 sin（27 π t/120 Ma + 0.9）+Xsin（2 π t/38.3 Ma + 1.1），“低纬”、“高纬”和“深海”环境的X值为0.4-0.6 ‰，“中纬”环境的X值为0.8 ‰。与沉积学和动物群记录解释的古气候变化相一致。“深水”和“高纬度”与低纬度表层生境之间的三角洲C-13值的偏移与至少自白垩纪以来海洋中生物泵的运作相一致。Sr和S同位素记录显示出类似于60- 70 Ma旋回贯穿整个中生代。(c)2008 Elsevier B.V保留所有权利。
The Sr, S, O and C isotope database of marine carbonates contains over 55,000 published isotope values of low-Mg calcite from diagenetically little altered Phanerozoic fossil shells as well as samples of whole rocks and calcite cements of Ordovician to Archean age. Carbon and oxygen isotope data for the shell material are divided into habitat subsets (high-, mid-, low-latitude and deep sea), and whole rock data are separated by mineralogy into calcite/dolomite subsets. Trend, correlation, wavelet, and spectral analyses on Gaussian-filtered isotope records were applied to detect and quantify similarities and patterns in temporal records with the following results:Oxygen isotope trends from the "high-latitude" and "deep-sea" habitats are almost indistinguishable through the last 115 Ma, consistent with the existence of the "oceanic conveyor belt" throughout this interval;All oxygen isotope habitat records show a strong, coherent 30-45 Ma (similar to 38 Ma) cyclicity throughout the Cretaceous and the CenozoicUp to 70% of the multi-million year variability in the 6180 record of the last 115 Ma can be simulated by the following equation:delta O-18(parts per thousand) = 0.64 sin (27 pi t/120 Ma + 0.9) +Xsin (2 pi t/38.3 Ma + 1.1)with X ranging from 0.4-0.6 parts per thousand for the "low- ", "high-latitude" and "deep-sea" habitats, to 0.8 parts per thousand for the "mid-latitude" realm.A similar to 120 +/- 20 Ma cycle occurs in the Paleozoic and Neoproterozoic delta O-18 record, consistent with paleoclimate variability as interpreted from sedimentological and faunal records.The offset of delta C-13 values between "deep water" and "high-latitude" vs. surficial habitats at lower latitudes is consistent with the operation of a biological pump in the oceans since at least the Cretaceous.Sr and S isotope records exhibit a similar to 60-70 Ma cyclicity throughout the Phanerozoic. (c) 2008 Elsevier B.V All rights reserved.