| 辽宁兴城中元古界常州沟组砂岩中微生物成因沉积构造 |
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| 引用本文： | 李晓波,王旖旎,王晗.辽宁兴城中元古界常州沟组砂岩中微生物成因沉积构造[J].沉积学报,2020,38(1):32-45. |
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| 作者姓名： | 李晓波 王旖旎 王晗 |
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| 作者单位： | 1.吉林大学地球科学学院, 长春 130061 |
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| 基金项目： | 中国地质调查局区调修测项目1212011120730吉林大学实践教学研究项目PB2014004 |
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| 摘 要： | 辽宁兴城夹山中元古界常州沟组潮间带相砂岩层面产出裂隙状构造。这些构造由0.8~3 cm长的纺锤状短裂隙和超过7 cm的长延伸裂隙组成，孤立为主，部分相连。通过与类似的层面裂隙和现代微生物席干缩裂隙的比较分析，将其解释为微生物成因沉积构造分类体系中的收缩裂隙（Shrinkage crack），并参考席裂多边形（Mat-crack polygon）的术语称其为席裂（Mat-crack）。微生物席在脱水不充分的情况下形成纺锤状席裂，脱水充分的情况下形成席裂多边形。这些构造在常州沟组的出现，表明微生物生态系统在华北克拉通中元古代海侵初期已经开始影响古海岸带的地质作用，这对于恢复燕山裂陷槽盆地的生物—沉积作用和环境演化具有重要意义。
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| 关 键 词： | 微生物席 古环境 潮间带 前寒武纪 长城系 |
| 收稿时间： | 2019-01-07 |
Microbially Induced Sedimentary Structures (MISS) in Mesoproterozoic Changzhougou Formation Sandstone,Xingcheng Area,Liaoning Province,China |
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| Institution: | 1.College of Earth Sciences, Jilin University, Changchun 130061, China2.Department of Biology, University of Toronto Mississauga, Ontario L5L 1C6, Canada |
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| Abstract: | Numerous crack structures are found in the intertidal facies sandstone of the Mesoproterozoic Changzhougou Formation in Jiashan, Xingcheng area, Liaoning Province. The structures comprise 0.8-3.0 cm spindle-shaped short cracks, and extended cracks over 7 cm long. They are mainly isolated, some partially connected. By comparing them with other similar surface crack structures and the desiccation cracks developed in modern microbial mats, they are explained as shrinkage cracks in microbial mats ('mat-cracks'). Unconnected spindle-shaped mat-cracks indicate incomplete mat shrinkage; mat-crack polygons form when shrinkage is complete. The presence of MISS indicates that the microbial ecosystem was already affecting the paleocoastal geological processes during the early transgression stage of the North China Craton in the Mesoproterozoic. This information is crucial for reconstructing the biosedimentary mechanisms and paleoenvironment of the aulacogenic Yanshan Basin during its early evolution. |
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