| 奥陶系宝塔组灰岩的环境相、生态相与成岩相 |
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| 引用本文： | 许效松,万方,尹福光,陈明.奥陶系宝塔组灰岩的环境相、生态相与成岩相[J].矿物岩石,2001,21(3):64-68. |
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| 作者姓名： | 许效松 万方 尹福光 陈明 |
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| 作者单位： | 成都地质矿产研究所,四川,成都,610081 |
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| 摘 要： | 晚奥陶世宝塔组灰岩在上、中、下扬子碳酸盐沉积区分布极为广泛，因其层面上注记着不规则状、类似鸡冠花的形态特征，因而素以加引号的“龟裂纹灰岩”称之，以此代表宝塔组灰岩特有的沉积构造，以致于两者为同一词。宝塔组灰岩是地质历史中仅有的、唯一的在层面上具有特殊网纹的形态组构，其他时代的灰岩均无此特点，因而它是地质历史中的“时髦相”。形成这一组构可能有三个因素：一是盆地的沉积－构造背景，华南晚奥陶世为前陆盆地，前隆的结果使建筑在克拉通上的碳酸盐大平台构造掀斜，成为浅海中的深水盆地，为低能、慢速沉积的灰泥岩、泥灰岩提供了宽大而平坦的构造－沉积环境空间；二是深水环境中的生态和生物遗迹，由游泳型角石和与之能抗衡的大型软体生物在软底上和沉积物内留下活动的印迹；三是灰泥和泥质物成岩压实作用，叠加在印痕上，因此，宝塔组灰岩“龟裂纹”组构的形成是构造－沉积环境相、生态相和成岩相的产物。
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| 关 键 词： | 宝塔组 灰岩 前陆盆地 构造－沉积环境相 生态相 成岩相 奥陶系 |
| 文章编号： | 1001-6872(2001)03-0064-05 |
ENVIRONMENT FACIES,ECOLOGICAL FACIES AND DIAGENETIC FACIES OF BAOTA FORMATION,OF LATE ORDOVINA |
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| XU Xiao,song,WAN Fang,YIN Fu,guang,CHEN Ming.ENVIRONMENT FACIES,ECOLOGICAL FACIES AND DIAGENETIC FACIES OF BAOTA FORMATION,OF LATE ORDOVINA[J].Journal of Mineralogy and Petrology,2001,21(3):64-68. |
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| Authors: | XU Xiao song WAN Fang YIN Fu guang CHEN Ming |
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| Abstract: | The limestone of Baota Formation in the Late Ordovician is widespread in Yangtze carbonate sedimentary area.It is characterized by the irregular,cockscomb shaped decorative pattern on the surface of the bedding,and is usually called chapping grain limestone.Three factors are responsible for the formation of this special decorative grain fabrics ever occurred in geological history.The first one is the sedimentary tectonic background of the basin.The uplift of the foreland basin resulted in the inclination of carbonate platform,formed a deep water basin on the craton in Ordovician and provided low energy,low velocity environment for the sedimentation of mud limestone and lime mudstone.The second one is the ecology and biogliph of the deep water environment.Swimming Orthocerida and huge Mollusea left marks on or in the soft mud and lime.The last one is the diagenesis of limestone and mud,which superimposed on the imprint.Therefore,the formation of Baota limestone is the combination of sedimento tectonic,ecological and diagenetic facies. |
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| Keywords: | Baota Formation limestone foreland basin tectonic sedimentary environment facies ecological Facies diagenetic facies |
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