| 辽宁中元古代初期粗碎屑岩中微生物砂质颗粒的发现及古环境意义 |
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| 引用本文： | 于晓辉,沈军,林玲玲,范天骐.辽宁中元古代初期粗碎屑岩中微生物砂质颗粒的发现及古环境意义[J].地学前缘,2016,23(4):284-291. |
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| 作者姓名： | 于晓辉 沈军 林玲玲 范天骐 |
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| 作者单位： | 1. 中国地震局 地质研究所, 北京 100029
2. 防灾科技学院 地震科学系, 北京 101601 |
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| 基金项目： | 中国地震局教师基金项目(20090130)；国家自然科学基金项目(41372216)；中央高校创新项目团队资助计划项目(ZY20120102) |
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| 摘 要： | 微生物席成因构造(microbial induced sedimentary structures, MISS)是由微生物与沉积物相互作用形成的生物沉积构造，表现形式有变余波痕、皱饰构造、微生物席碎片、纺锤状或次圆状收缩裂缝等。首次在华北地台东北部辽宁兴城中元古代初期常州沟组底部粗碎屑岩交错层理面上发现了大量的微生物砂质颗粒，在中元古代底部粗碎屑岩中发现大量微生物砂质碎片。这一发现对于了解华北地台MISS的活跃时代以及恢复中元古代早期粗碎屑岩的形成古环境有重要的科学意义，特别是为华北地台古元古代、中元古代的地层划分与对比提供一定的生物地层学参考。发现的微生物砂质颗粒大小在0.1~0.2 mm，形态以球形为主。这些微生物砂质颗粒形成于静水环境的潮上带或泥坪之中的微生物席底，在剧烈的构造运动以及海侵初期高频的海平面运动中被风暴、海啸等灾难性事件破坏，并随着退潮水流被搬运至发育交错层理的潮道区域，与粗碎屑物质一起沉积。这些被风暴破坏的微生物砂质颗粒在搬运过程中被磨圆并产生一定的分选。
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| 关 键 词： | 辽宁兴城 中元古界 微生物砂质颗粒 古环境 |
| 收稿时间： | 2015-04-10 |
The discovery of microbial debris in the coarse clastic rock of the early Mesoproterozoic in Liaoning Province,China and its paleoenvironmental significance |
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| XU Xiao-Hui,CHEN Jun,LIN Ling-Ling,FAN Tian-Qi.The discovery of microbial debris in the coarse clastic rock of the early Mesoproterozoic in Liaoning Province,China and its paleoenvironmental significance[J].Earth Science Frontiers,2016,23(4):284-291. |
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| Authors: | XU Xiao-Hui CHEN Jun LIN Ling-Ling FAN Tian-Qi |
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| Institution: | 1. Institute of Geology, China Earthquake Administration, Beijing 100029, China;
2. Department of Earthquake Science, Institute of Disaster Prevention Science and Technology, Beijing 101601, China |
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| Abstract: | The Changzhougou Formation in the Proterozoic is a set of clastic rock unconformably on the Archean granite gneiss. On the coarse clastic rock of the bidirectional cross bedding lying on the bottom of Changzhougou Formation in Xingcheng, Liaoning Province, we found a large number of sandy microbial particles, size of which is between 0.1 mm and 0.2 mm, giving priority to spherical shape, as well as square and ship type. This paper argues that the cause of these sandy microorganisms particles is that the microbial matground in the relatively hydrodynamically quiet supratidal flat or high tide mud flat was damaged by the storm and tsunami disaster events by intense tectonic movement and high frequency sea level movement in the early transgression movement at the beginning of the Mesoproterozoic erathem. Then it was transported to the strong hydrodynamic and bimodal cross bedding developed area of the tidal channel with the tide flow and deposited with detrital material; in the process of transportation, these particles damaged by the storm were rounded and sorted. At the same time, on the basis of the primary sedimentary structure of these microbes and characteristics of sedimentary of the development of the Changzhougou Formation, we identified the formation environment of the Changzhougou Formation as the barrier island tidal flat sedimentological system. |
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| Keywords: | Xingcheng City of Liaoning Province Mesoproterozoic erathem sandy microorganisms particles palaeoenvironment |
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