| 腕足壳体与碳酸盐岩全岩中碳、氧、锶同位素差异 |
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| 引用本文： | 程红光,李心清,黄思静,王兵,程建中.腕足壳体与碳酸盐岩全岩中碳、氧、锶同位素差异[J].沉积学报,2015,33(1):60-66. |
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| 作者姓名： | 程红光 李心清 黄思静 王兵 程建中 |
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| 作者单位： | 1.中国科学院地球化学研究所环境地球化学国家重点实验室 贵阳 550002; |
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| 基金项目： | 国家自然科学基金项目(批准号:41003006,40273011);省科学技术基金(编号:2009GZ49244)联合资助 |
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| 摘 要： | 利用碳酸盐岩中的地球化学信息反演是研究地质历史时期古环境、古气候变化的一种常用手段.上世纪八十年代前,学术界一直将碳酸盐岩全岩样品作为研究对象.近年来,腕足化石壳体引起了科学家的注意,认为相比碳酸盐岩全岩样品,腕足壳体能更为完好地保存原始的地球化学信息.研究通过对比四川龙门山泥盆纪腕足化石和碳酸盐岩全岩样品中碳、氧、锶同位素(黄思静、卢长武等人数据),发现腕足化石中氧同位素明显高于碳酸盐岩全岩;但碳、锶同位素基本一致.上述结果表明:相比腕足化石,碳酸盐岩全岩样品蕴含的地球化学信息虽有所差异,但在大多数情况下,尤其是缺乏腕足化石的时期,碳酸盐岩全岩蕴含的地球化学信息照样可以反演地质历史时期的古环境变化,尤其是碳、锶同位素.
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| 关 键 词： | 腕足 同位素 碳酸盐岩全岩 古环境 |
| 收稿时间： | 2014-01-14 |
The Discrepancy in Carbon,Oxygen and Strontium Isotope between Brachiopod Fossil Shells and the whole Carbonate Rocks |
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| CHENG HongGuang;LI XinQing;HUANG SiJing;WANG Bing;CHENG JianZhong.The Discrepancy in Carbon,Oxygen and Strontium Isotope between Brachiopod Fossil Shells and the whole Carbonate Rocks[J].Acta Sedimentologica Sinica,2015,33(1):60-66. |
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| Authors: | CHENG HongGuang;LI XinQing;HUANG SiJing;WANG Bing;CHENG JianZhong |
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| Institution: | 1.State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002;2.State Key Laboratory of Oil and Gas Geology and Exploitation, Chengdu 610059 |
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| Abstract: | It is common method to utilize the geochemical information in carbonate rocks to study the ancient environment and climate changes in the geological history. As in early 1980s, the whole-rock carbonate was studied as main samples. Recently, more attentions has been attracted by brachiopod fossil shells because of their composition which was the low magnesium calcite with high capacity to resist the diagenetic alteration. In this study, the comparison of δ18O, δ13C and 87Sr/86Sr respectively from brachiopod fossil shells and whole carbonate rocks in Longmen mountian in Sichuan province showed: there was higher δ18O values in brachiopod shells, and similar trend in the evolution of 87Sr/86Sr and δ13C between brachiopod fossil shells and the whole rocks carbonate. These results indicated that the geochemical information in the whole rocks carbonate still could be used to as an indicator for reconstructing the evolution of paleoclimate although there were some differences in the geochemical information between the whole rocks carbonate and brachiopod fossil shells, especially in the period within lack of brachiopod fossil shells. |
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| Keywords: | brachiopod isotope whole-rock carbonate paleoenvironment |
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