| 河南汝州-鲁山一带震旦系东坡组碳酸盐沉积的碳同位素负偏及其地质意义 |
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| 引用本文： | 张良,杜远生,左景勋,周琦.河南汝州-鲁山一带震旦系东坡组碳酸盐沉积的碳同位素负偏及其地质意义[J].地球科学,2008,33(4):523-530. |
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| 作者姓名： | 张良 杜远生 左景勋 周琦 |
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| 作者单位： | 1.中国地质大学地球科学学院, 湖北武汉 430074 |
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| 基金项目： | 中石化海相油气勘探前瞻性项目
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国家自然科学基金
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教育部创新团队发展计划 |
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| 摘 要： | 河南汝州、鲁山一带罗圈组冰积层之上的东坡组以页岩、粉砂质页岩及粉砂岩为主.笔者发现了东坡组夹有白云岩透镜体及白云质粉砂岩、砂岩.白云质粉砂岩具有与东坡组页岩不协调的软沉积变形.白云岩透镜体和白云质粉砂岩具有明显的δ13C负偏.白云岩透镜体的δ13C为-4.19‰~-6.18‰.白云质粉砂岩的δ13C大部分为-2‰~-4‰之间.因此认为, 东坡组的白云岩透镜体及白云质粉砂岩、砂岩与华南震旦纪盖帽白云岩及南华纪Sturtian冰期冰积层之上的碳酸盐丘和菱锰矿类似, 为冰积层中的天然气水合物泄漏释放的CO2和海水中的Mg2+发生快速反应快速沉淀而成的, 即东坡组的白云岩、白云质粉砂岩、砂岩为冷泉成因.
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| 关 键 词： | 冷泉碳酸盐岩 碳同位素 震旦纪 河南省 |
| 收稿时间： | 2008-04-12 |
Negative Anomaly of Carbon Isotope from Carbonates of Sinian Dongpo Formation in Ruzhou and Lushan, Henan Province and Its Geological Significance |
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| ZHANG Liang,DU Yuan-sheng,ZUO Jing-Xun,ZHOU Qi.Negative Anomaly of Carbon Isotope from Carbonates of Sinian Dongpo Formation in Ruzhou and Lushan, Henan Province and Its Geological Significance[J].Earth Science-Journal of China University of Geosciences,2008,33(4):523-530. |
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| Authors: | ZHANG Liang DU Yuan-sheng ZUO Jing-Xun ZHOU Qi |
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| Abstract: | Sinian Dongpo Formation overlying tillite of Luoquan Formation consists mainly of shales, silty shales and siltstones.Lenticular dolomites, dolomitic siltstones and sandstones are unexpectedly found in Dongpo Formation.Soft-sediment reformation occurs in dolomitic siltstones which are inconsistent with the shales of Dongpo Formation.Negative anomaly of δ13C is found in lenticular dolomites and dolomitic siltstones.δ13C of lenticular dolomites is-4.19‰ to-6.18‰ and δ13C of dolomitic siltstones mostly between-2‰ to-4‰.So it is considered that lenticular dolomites, dolomitic siltstones and sandstones in Dongpo Formation, similar to cap dolomite of Sinian and seep carbonates overlying tillite of Sturtian ice-age in South China, have been formed by interaction between CO2 seeped from gas hydrate and Mg2+ in sea water, that is, lenticular dolomites, dolomitic siltstones and sandstones in Dongpo Formation are the cause of formation of cold spring. |
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| Keywords: | cold seep carbonate carbon isotope Sinian Henan Province |
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