| Evolution of chlorite composition in the Paleogene prototype basin of Jiyang Depression, Shandong, China, and its implication for paleogeothermal gradient |
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| 作者单位： | ZHAO Ming（State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China） ;
CHEN XiaoMing（State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China） ;
JI JunFeng（State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China） ;
ZHANG Zhe（State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China） ;
ZHANG Yun（Jiangsu Survey Institute of Engineering and Physics,Nanjing 210008,China） ; |
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| 摘 要： | The Dongying Basin, Huimin Basin, and Zhanhua Basin constitute the Jiyang Depression in Shandong Province. They are major oil and gas exploring districts within the depression. Through reconstruc-tions of the paleotemperature of the three basins facilitated with the chlorite geothermometry, the thermal history of the Paleogene prototype basin in Jiyang Depression and its geologic significance were explored. This study reveals that the Si4 component in chlorites reduces gradually as its buried depth increases, while the AlIV component increases accordingly. The chlorite type changes from sili-con-rich diabantite to silicon-poor ferroamesite and prochlorite. The prochlorite in this district only appears in the deep buried depth, high temperature, and relatively old stratigraphies; while the diaban-tite appears in the shallower buried, low temperature, and newly formed strata; the ferroamesite exists in the conditions between prochlorite and diabantite formation. The diagenetic temperatures of the chlorites in these Paleogene basins are 171―238℃ for the Dongying Basin, 160―202℃ for the Huimin Basin, and 135―180℃ for the Zhanhua Basin. The differences of the chlorite diagenetic temperatures in the three basins were controlled by the duration time of the structural depressing processes. Higher temperature indicates longer depression time. The relationship between the chlorite diagenetic temperature and its buried depth indicates that the average paleogeothermal gradient is about 38.3℃ /km in the Paleogene prototype basin of Jiyang Depression. It was higher than the present geothermal gradient (29―30℃/km). This phenomenon was attributed to the evolution of the structural dynamics in the depression basin.
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| 收稿时间： | 26 September 2006 |
| 修稿时间： | 13 June 2007 |
Evolution of chlorite composition in the Paleogene prototype basin of Jiyang Depression,Shandong, China,and its implication for paleogeothermal gradient |
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| Authors: | Zhao Ming Chen XiaoMing Ji JunFeng Zhang Zhe Zhang Yun |
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| Institution: | 1. State Key Laboratory for Mineral Deposits Research,Department of Earth Sciences,Nanjing University,Nanjing 210093,China
2. Jiangsu Survey Institute of Engineering and Physics,Nanjing 210008,China |
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| Abstract: | The Dongying Basin, Huimin Basin, and Zhanhua Basin constitute the Jiyang Depression in Shandong Province. They are major
oil and gas exploring districts within the depression. Through reconstructions of the paleotemperature of the three basins
facilitated with the chlorite geothermometry, the thermal history of the Paleogene prototype basin in Jiyang Depression and
its geologic significance were explored. This study reveals that the Si4+ component in chlorites reduces gradually as its buried depth increases, while the AlIV component increases accordingly. The chlorite type changes from silicon-rich diabantite to silicon-poor ferroamesite and
prochlorite. The prochlorite in this district only appears in the deep buried depth, high temperature, and relatively old
stratigraphies; while the diabantite appears in the shallower buried, low temperature, and newly formed strata; the ferroamesite
exists in the conditions between prochlorite and diabantite formation. The diagenetic temperatures of the chlorites in these
Paleogene basins are 171–238°C for the Dongying Basin, 160–202°C for the Huimin Basin, and 135–180°C for the Zhanhua Basin.
The differences of the chlorite diagenetic temperatures in the three basins were controlled by the duration time of the structural
depressing processes. Higher temperature indicates longer depression time. The relationship between the chlorite diagenetic
temperature and its buried depth indicates that the average paleogeothermal gradient is about 38.3°C/km in the Paleogene prototype
basin of Jiyang Depression. It was higher than the present geothermal gradient (29–30°C/km). This phenomenon was attributed
to the evolution of the structural dynamics in the depression basin. |
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| Keywords: | Paleogene Jiyang depression chlorite component chlorite geothermometry paleotemperature paleogeothermal gradient |
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