| 中元古界非叠层石灰岩中的MISS:以北京延庆千沟剖面高于庄组第三段为例 |
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| 引用本文： | 梅冥相,高金汉,孟庆芬.中元古界非叠层石灰岩中的MISS:以北京延庆千沟剖面高于庄组第三段为例[J].地学前缘,2009,16(5). |
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| 作者姓名： | 梅冥相 高金汉 孟庆芬 |
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| 作者单位： | 中国地质大学,地质过程与矿产资源国家重点实验室,北京,100083;中国地质大学(北京)地球科学与资源学院,北京,100083 |
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| 基金项目： | 国家自然科学基金，中国石油化工股份有限公司海相前瞻性项目 |
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| 摘 要： | 前寒武纪碳酸盐岩多以叠层石碳酸盐岩序列为特征。燕山地区中元古界高于庄组,其中的第三段(张家裕亚组)则为一个以灰岩为主、贫乏叠层石的碳酸盐岩沉积序列,该序列被定义为前寒武纪非叠层石碳酸盐岩序列。该非叠层石碳酸盐岩沉积序列,尤其以燕山西部的延庆千沟剖面最为典型。根据沉积相序列及其所反映的旋回性,可以将该剖面的高于庄组第三段划分为3个三级层序。在这些三级层序的海侵体系域和早期高水位体系域中,中薄层隐晶质泥晶灰岩(均一石灰岩)和灰黑色薄层泥灰岩组成若干潮下型米级旋回;而在隐晶质泥晶灰岩层面上,普遍发育各种奇形怪状的沉积构造。这些沉积构造包括穹窿状构造、规则网状和杂乱的帐篷脊、变余波痕等,构成一个潮下相灰岩层面上的特别的微生物形成的沉积构造(Microbial Induced Sedimentary Structure,MISS)组合。因此,延庆千沟剖面的高于庄组第三段,特别的岩石类型和沉积构造成为前寒武纪碳酸盐岩沉积中非叠层石碳酸盐岩沉积序列的典型代表,尤其是那些奇形怪状的MISS所代表的沉积学特点表明:在前寒武纪,即使在叠层石生长的黄金时段,也发育非叠层石碳酸盐岩沉积序列。因此,这些现象将特别有助于对前寒武纪非叠层石生态系所造成的另一类席底生境的深入理解,也有助于复杂多变的碳酸盐岩世界。
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| 关 键 词： | MISS 非叠层石碳酸盐岩序列 高于庄组 中元古界 延庆千沟剖面 |
MISS in Mesoproterozoic non-stromatolitic limestones:A case study from the third member of Gaoyuzhuang Formation at Qiangon section in Beijing |
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| Mei Mingxiang,Gao Jinhan,Meng Qingfen.MISS in Mesoproterozoic non-stromatolitic limestones:A case study from the third member of Gaoyuzhuang Formation at Qiangon section in Beijing[J].Earth Science Frontiers,2009,16(5). |
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| Authors: | Mei Mingxiang Gao Jinhan Meng Qingfen |
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| Abstract: | Stromatolitic carbonate succession is common in the Precambrian.In the Yanshan Area,the third member of the Mesoproterozoic Gaoyuzhuang Formation is made up of a particular limestone succession with the sparseness of stromatolites,and this limestone succession has been defined as the non-stromatolitic carbonate succession.For the non-stromatolitic carbonate succession,the third member of the Gaoyuzhuang Formation at the Qiangou section in Beijing is a typical example,in which three third-order sequences can be discerned according to the cyclicity reflected by successions of sedimentary facies.Within these third-order sequences,there are many subtidal carbonate cycles that are made up of both the medium-to thin-bedded aphanitic micrites and the thin-bedded marls in the transgressive and the early high-stand system tracts,and many grotesque sedimentary structures are developed in the bedding planes of aphanitic micrites.These sedimentary structures,including the domal structure,the irregular reticular and the irregular chaotic tepee ridges,and the palimpsest ripple,make up an association of the microbial induced sedimentary structure(MISS).Therefore,both the special MISSs and the particular lithological types make the third member of the Mesoproterozoic Gaoyuzhuang Formation at the Qiangou section become the representative of the Precambrian non-stromatolitic carbonate succession.More importantly,this succession was formed during the stromatolitic golden age,which provides useful information for the further understanding of the evolving carbonate world of the Precambrian. |
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| Keywords: | MISS |
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