| 巢湖平顶山北坡剖面早三叠世碳、氧同位素地层学研究 |
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| 引用本文： | 左景勋,童金南,邱海鸥,赵来时.巢湖平顶山北坡剖面早三叠世碳、氧同位素地层学研究[J].地层学杂志,2004,28(1):35-40,47. |
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| 作者姓名： | 左景勋 童金南 邱海鸥 赵来时 |
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| 作者单位： | 中国地质大学地球科学学院,湖北武汉,430074;中国地质大学材料科学与化学工程学院,湖北武汉,430074 |
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| 基金项目： | 全国地层委员会研究项目，国家自然科学基金，国家重点基础研究发展计划(973计划) |
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| 摘 要： | 取自安徽巢湖平顶山北坡下三叠统剖面中 12 4个碳、氧同位素样品的分析结果表明 ,由 Induan阶→Olenekian阶下部→ Olenekian阶中部 ,δ1 3C平均值由 - 1.8‰减小到 - 3.9‰后又快速增大到 3.7‰ ,δ1 8O的平均值由 - 6 .9‰降低到 - 8.6‰后又回升到 - 6 .5‰。 Induan阶的中、上部δ1 3C呈缓慢上升趋势 ,Olenekian阶下部δ1 3C呈明显的“U”型谷 ,Olenekian阶中部 δ1 3C表现为显著正漂。碳、氧同位素演化特征表明 ,早三叠世 Induan期环境恶劣、生物复苏缓慢 ,Olenekian早期的地质事件导致生物再次绝灭 ,延缓了生物复苏的进程。
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| 关 键 词： | 早三叠世 碳、氧同位素地层学 巢湖 安徽 |
| 文章编号： | 0253-4959(2004)01-0035-06 |
Carbon and Oxygen isotope stratigraphy of the Lower Triassic at Northern Pingdingshan section of Chaohu, Anhui Province,China |
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| ZUO Jing xun ,TONG Jin nan ,QIU Hai ou ,and ZHAO Lai shi.Carbon and Oxygen isotope stratigraphy of the Lower Triassic at Northern Pingdingshan section of Chaohu, Anhui Province,China[J].Journal of Stratigraphy,2004,28(1):35-40,47. |
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| Authors: | ZUO Jing xun TONG Jin nan QIU Hai ou and ZHAO Lai shi |
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| Institution: | ZUO Jing xun 1),TONG Jin nan 1),QIU Hai ou 2),and ZHAO Lai shi 1) |
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| Abstract: | Results of 124 carbonate samples for carbon and oxygen isotopic analysis collected in the Northern Pingdingshan Section in Chaohu, Anhui Province, show relatively low mean values in δ 13 C of -1.77‰ in Induan, followed by a large negative shift with the mean values of -3.90‰ in the earliest Olenekian, and then a distinctive positive shift with the mean values of 3.65‰ in the Middle Olenekian. Similarly, the mean values inδ18O decrease from -6.87‰ in Induan to -8.56‰ in the earliest Olenekian, and then return up to -6.52‰ in the Middle Olenekian. Consequently, a gradual increase, a sharp negative shift and a pronounced positive shift in values of δ 13 C occurred in Induan, in the earliest Olenekian and in the Middle Olenekian, respectively. The characteristics of carbon and oxygen isotopic trends imply a harsh environment that was disadvantageous to marine faunas, suggesting a very slow recovery in the Early Triassic. Further more, the repeated geological events might have been responsible for the prolonged recovery interval following the mass extinction. |
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| Keywords: | Lower Triassic carbon and oxygen isotopic stratigraphy Chaohu |
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