| 天津蓟县中元古界雾迷山组复合海平面变化旋回层序的初步研究 |
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| 引用本文： | 梅冥相,杜本明,周洪瑞,罗志清.天津蓟县中元古界雾迷山组复合海平面变化旋回层序的初步研究[J].沉积与特提斯地质,1999,19(5):12-22. |
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| 作者姓名： | 梅冥相 杜本明 周洪瑞 罗志清 |
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| 作者单位： | 中国地质大学地质矿产系,北京,100083 |
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| 基金项目： | 国家自然科学基金 ；“九五”攀登专项 |
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| 摘 要： | 天津蓟县中元古界雾迷山组为一套厚３０００ 余米的碳酸盐岩地层，叠层石生物层和凝块石生物丘特别发育。它们与潮坪相泥晶白云岩和泥质白云岩构成具对称相序组构的环潮坪型碳酸盐米级旋回层序。米级旋回层序之顶覆以厚度不等的澲湖相白云质泥页岩。常常３ ～５ 个米级旋回层序呈有序叠加构成五级准层序组，少数米级旋回层序还可识别出５ 个七级韵律层而呈现出１∶５ 的叠加关系。因此，七级韵律层、米级旋回层和五级准层序组分别与岁差旋回、短偏心率旋回、长偏心率旋回间存在有成因联系。根据米级旋回层序在长周期层序中的有序垂直叠加形式，在雾迷山组中可识别出２６ 个三级层序，进一步归为６ 个二级层序。
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| 关 键 词： | 旋回层序 复合海平面变化 雾迷山组 中元古界 蓟县剖面 |
| 收稿时间： | 1999/3/30 0:00:00 |
| 修稿时间： | 1999-03-30 |
A preliminary study of the cyclic sequences of composite sea-level changes in the Mesoproterozoic Wumishan Formation in Jixian,Tianjin |
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| MEI Ming-xiang,DU Ben-ming,ZHOU Hong-rui,LUO Zhi-qing.A preliminary study of the cyclic sequences of composite sea-level changes in the Mesoproterozoic Wumishan Formation in Jixian,Tianjin[J].Sedimentary Geology and Tethyan Geology,1999,19(5):12-22. |
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| Authors: | MEI Ming-xiang DU Ben-ming ZHOU Hong-rui LUO Zhi-qing |
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| Institution: | Department of Geology and Mineral Resources, China University of Geosciences, Beijing 100083, China |
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| Abstract: | The Mesoproterozoic Wumishan Formation in Jixian, Tianjin represents a succession of 300 m thick carbonate strata, in which stromatolite biostromes and clotted bioherms are best developed. These biostromes and bioherms, together with tidal flat dolomicrite and muddy dolostone, form circum tidal flat meter scale carbonate cyclic sequences with symmetrical facies sequences and fabrics. These cyclic sequences are overlain by the lagoon dolomitic mudstones and shales. Generally speaking, three to five orderly stacked meter scale cyclic sequences may form one fifth order parasequence set. Occasionally, five seventh order rhythmites are also recognized in some of the meter scale cyclic sequences. Therefore, the seventh order rhythmites, meter scale cyclic sequences and fifth order parasequence sets are correlative in origin with precession of equinox cycles, short eccentricity cycles and long eccentricity cycles, respectively. Viewed from the ordered stacking patterns of the meter scale cyclic sequences in the long period sequences, twenty six third order sequences may be identified in the Wumishan Formation. These third order sequences may also be incorporated into six second order sequences. |
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| Keywords: | cyclic sequence composite sea level change Wumishan Formation Mesoproterozoic Jixian section |
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