| 北京寒武系第二统昌平组凝块石特征及成因 |
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| 引用本文： | 白莹,罗平,徐旺林,王珊,龚骥遥.北京寒武系第二统昌平组凝块石特征及成因[J].沉积学报,2021,39(4):873-885. |
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| 作者姓名： | 白莹 罗平 徐旺林 王珊 龚骥遥 |
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| 作者单位： | 中国石油勘探开发研究院,北京 100083;中国石油渤海钻探工程有限公司第二钻井分公司,河北廊坊 065007 |
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| 基金项目： | 国家科技重大专项;国家科技重大专项;中国石油科技项目 |
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| 摘 要： | 北京西郊下苇甸地区下寒武统昌平组底部含燧石角砾白云岩之上发育的一套豹斑灰岩，实为发育在高能环境下的凝块石灰岩，宏观形态上可包括斑状凝块石、带状凝块石和网状凝块石3种，其成因多与厚微生物席相关，且分别具有不同的微观结构。露头实测和镜下观察结果表明凝块石的初始沉积组分受控于沉积大/微环境，且三者的互动决定了凝块石的最终沉积特征。该套沉积成因的凝块石，其白云质凝块不局限于潜穴，且潜穴内部见大量保存完好微生物结构和疑似球状原生白云石，因此这种白云质凝块很可能与微生物白云石化密切相关，并以此区别于局限于生物遗迹位置，且内部充填物为粉细晶白云石的成岩成因的豹斑灰岩。
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| 关 键 词： | 北京 寒武系 第二统 凝块石 豹斑灰岩 微生物席 |
| 收稿时间： | 2019-12-19 |
Characteristics and Genesis of Thrombolites in the Cambrian Changping Formation,Series 2, Beijing |
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| BAI Ying,LUO Ping,XU WangLin,WANG Shan,GONG JiYao.Characteristics and Genesis of Thrombolites in the Cambrian Changping Formation,Series 2, Beijing[J].Acta Sedimentologica Sinica,2021,39(4):873-885. |
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| Authors: | BAI Ying LUO Ping XU WangLin WANG Shan GONG JiYao |
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| Institution: | 1.Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China2.No. 2 Drilling Company of Bohai Drilling Engineering Company, CNPC, Langfang, Hebei 065007, China |
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| Abstract: | Developing above the chert breccia dolomites at the bottom of the Cambrian Changping Formation， Series 2， western Beijing， is a set of so?called leopard limestones that are actually thrombolites in a high?energy environment and macroscopically include spotted， zonary， and reticular thrombolites. With various microstructures， their geneses are always related to the thick microbial mat. According to the results of outcrop observation and thin section identification， initial fabrics are controlled by the sedimentary and microenvironment in the microbial mat， and their interactions result in the final characteristics of the thrombolites. Thrombolites derived from dolomitic clots of sedimentary origin are not restricted in burrows， where well?preserved microfabrics and primary dolomites are found， and are closely related to the microbial dolomitization. These phenomena show the difference between sedimentary thrombolites and diagenetic leopard limestones whose leopard clots are limited to the location of the organic hieroglyph and filled with fine?grained dolomites. |
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