| 河东煤田晚古生代层序地层的碳氧同位素特征 |
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| 引用本文： | 李贵东,温显端.河东煤田晚古生代层序地层的碳氧同位素特征[J].煤田地质与勘探,1999,27(3):5-9. |
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| 作者姓名： | 李贵东 温显端 |
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| 作者单位： | 中国地质大学 北京 100083 |
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| 基金项目： | 国家重点基础研究发展计划(973计划) |
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| 摘 要： | 系统分析了河东煤田上石炭统(C2)-下二叠统下部(P11)45个碳酸盐岩样品的碳氧同位素在层序中的分布特征,探讨了碳氧同位素应用于层序划分及对比、相对海平面变化研究及晚古生代地层沉积相研究的可能性。研究表明,碳氧同位素在C2及P11的三级层序中的分布特征是不相同的,从TST到HST,在C2的三级层序中,δ13C及δ18O不断变重;在P11的三级层序中,δ13C不断变轻,而δ18O不断变重。这种规律在P11每个三级层序中均相似,垂向上显示出韵律性。横向上,δ13C及Z值总体具有由北向南升高的趋势。碳氧同位素在层序中的分布是受聚煤作用、陆源物质的注入、古气候、沉积环境及时间等控制的。
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| 关 键 词： | 碳同位素 氧同位素 层序地层学 晚古生代 河东煤田 |
| 收稿时间： | 1998-12-08 |
| 修稿时间： | 1998-12-08 |
CARBON AND OXYGEN ISOTOPES IN SEQUENCE STRATIGRAPHY OF LATE PALEOZOIC STRATA IN HEDONG COAL FIELD |
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| Li Guidong,Wen Xianduan.CARBON AND OXYGEN ISOTOPES IN SEQUENCE STRATIGRAPHY OF LATE PALEOZOIC STRATA IN HEDONG COAL FIELD[J].Coal Geology & Exploration,1999,27(3):5-9. |
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| Authors: | Li Guidong Wen Xianduan |
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| Institution: | China University of Geosciences |
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| Abstract: | Through testing 45 carbonate samples collected from PermoCarboniferous caol measures of the Hedong coalfield,the distributions characteristics of carbon and oxygen isotopes in sequences are analyzed,whose feasibilities for sequence subdivision and correlation,as well as for study of relative sea level variations and late Paleozoic facies are also discussed.It is shown that the distributions of carbon and oxygen isotopes in sequences(third order)are different between C2 and P11.In sequences of C2 the values of BX] 13C and 18O varied gradually heavier from TST to HST;in sequences of P11,however,the values of 13C varied lighter from TST to HST,but the values of 18O heavier,both of which presented rhythmicity vertically.Laterally the values of 13C and Z generally present an increasing trend southwards.The distribution of carbon and oxygen isotopes in sequences are controlled by many factors,such as coal accumulation,terrigenous supply,;paleoclimate,depositional environment and geologic time. |
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| Keywords: | carbon isotopes oxygen isotopes sequence stratigraphy late Paleozoic Hedong coalfield |
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