| 河南箕山地区中元古界五佛山群沉积环境及岩相古地理特征 |
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| 引用本文： | 左景勋.河南箕山地区中元古界五佛山群沉积环境及岩相古地理特征[J].地质科技情报,2002,21(3):30-34. |
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| 作者姓名： | 左景勋 |
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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 |
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| 基金项目： | 中国地质调查局国土资源大调查项目“临汝镇幅、陵头幅、方山幅、神后幅 1∶5万区域地质调查” |
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| 摘 要： | 河南箕山地区中元古界五佛山群是太古界、下元古界褶皱变质基底之上的第一盖层，由于基底构造的差异性，造成五佛山群马鞍山组、峡外组在海侵过程中处于不同的沉积环境，但总的看来，箕山地区中部为基底隆起区，东部为沉陷区，西部为一向西倾斜的缓坡区。在五佛山群马鞍山组沉积的早期，区内以河流相沉积为主；在马鞍山组沉积的中、晚期，东、西部均处于滨浅海环境，为滨浅海相碎屑岩沉积，中部隆起区呈多岛状，出现潮坪沉积环境，为潮坪相碎屑沉积。在五佛山群峡外组沉积期，古地理分异格局消失，箕山地区全部转化为潮坪环境。
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| 关 键 词： | 河南 箕山地区 中元古界 五佛山群 沉积环境 岩相古地理 潮坪环境 |
| 文章编号： | 1000-7849(2002)03-0030-05 |
| 修稿时间： | 2001年12月10 |
CHARACTERISTIC OF LITHOFACIES PALEOGEOGRAPHY AND SEDIMENTARY ENVIRONMENT OF THE MIDDLE PROTEROZOIC WUFUSHAN GROUP IN JISHAN AREA,HENAN PROVIN-CE,CHINA |
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| ZUO Jing,xun.CHARACTERISTIC OF LITHOFACIES PALEOGEOGRAPHY AND SEDIMENTARY ENVIRONMENT OF THE MIDDLE PROTEROZOIC WUFUSHAN GROUP IN JISHAN AREA,HENAN PROVIN-CE,CHINA[J].Geological Science and Technology Information,2002,21(3):30-34. |
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| Authors: | ZUO Jing xun |
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| Abstract: | The Middle Proterozoic Wufushan Group in Jishan area,Henan Province,is the first caprock on the folded and metamorphous basement of the Archozoic to Lower Proterozoic erathem. During the Middle Proterozoic transgressing,Wufushan Group comprised of Ma'anshan Formation and Xiamer Formation situated in different sedimentary environment due to the structural difference of the basement.In a word,there was a deeper subsidence area in the east,an uplift in the central part and a slope inclined westward in the west area of Jishan area.In the early stage of Wufushan Group deposition,river facies was formed in many parts of the Jishan area,but in the middle and later stage of Ma'anshan Formation deposition,the east and west of the Jishan area were on littoral acquiring clastic deposition of littoral facies while its central part was on tidal flat acquiring clastic deposition of tidal facies.By the last stage of Xiamer Formation deposition,all parts of the Jishan area turned to be a tidal flat and paleogeographic difference disappeared. |
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| Keywords: | Jishan area Middle Proterozoic Wufushan Group sedimentary environment paleogeography |
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