| 新元古代“雪球”事件对海水碳、硫同位素组成的影响 |
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| 关键词:Neoproterozoic Snowball Earth carbon isotope sulfur isotope isotopic fractionation |
| 基金项目:国家自然科学基金，中国科学院知识创新工程项目，49973008,40172015 |
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| The Effects of the Neoproterozoic Snowball Earth on Carbon and Sulfur Isotopic Compositions in Seawater |
| Global glaciations took place in the earth in Neoproterozoic, which are called the “Snowball Earth” event by some scho-lars. Seawater carbon and sulfur isotopic compositions experienced considerable variations near the Snowball Earth event. The carbo-nate in seawater was remarkably enriched in 13C before the Snowball Earth and was subjected to 13C depletion during and after the Snowball Earth event. Then,δ 34S values of carbonates underwent an obvious positive drift to +10‰. The δ 34S values of seawater sulfate got gradually lower before the Snowball Earth event. There was large positive drift of δ 34S values which exceeded +20‰ and reached the climax as soon as the snowball Earth was over. The synchronous sulfides had ultra-high δ 34S values. These striking variations of carbon and sulfur isotopic compositions in seawater were caused by the drastic change of the environment near the Snowball Earth. These variations of seawater carbon and sulfur isotopes resulte. |
| ZHANG Tong-gang,CHU Xue-lei,FENG Lian-jun,ZHANG Qi-rui,GUO Jian-ping.2003.The Effects of the Neoproterozoic Snowball Earth on Carbon and Sulfur Isotopic Compositions in Seawater[J].Acta Geoscientica Sinica,24(6):487-493. |
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