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cambrian Reefs in the Western North China Platform,Wuhai,Inner Mongolia

Acta Geologica Sinica(English Edition) 2016年第6期90卷 1946-1954页

作者： LEE Jeong-Hyun KIM Byeong-Jun LIANG Kun PARK Tae-Yoon S. CHOH Suk-Joo LEE Dong-Jin WOO Jusun Department of Geology and Earth Environmental Sciences Chungnam National University Department of Geoenvironmental Sciences Kongju National University Nanjing Institute of Geology and Palaeontology Chinese Academy of Sciences Division of Polar Earth-System Sciences Korea Polar Research Institute Department of Earth and Environmental Sciences Korea University Department of Earth and Environmental Sciences Andong National University

Mid to late cambrian thrombolites and maze-like maceriate reefs from the western North China Platform, Wuhai, Inner Mongolia, northwestern China, occur in the middle of a succession dominated by thin-bedded lime mudstone-shale/marlstone alternations, and are laterally surrounded by limestone conglomerate and/or grainstone. Thrombolite, characterized by meter-scale lenticular mounds composed of millimeter- to centimeter-scale mesoclots and wackestone matrix, occurs in the lower middle part of the sequence. Thrombolite mesoclots are composed of microstromatolites with alternating dark gray and light gray micritic laminae. The maze-like maceriate reefs occur in the middle to the upper part of the sequence, commonly forming lenticular mounds up to 1 m thick. They are characterized by centimeter- to decimeter-scale branched maze-like structures, whose biogenic portions （maceria） are selectively dolomitized. The maceriae are composed of poorly preserved microstromatolites and siliceous sponges. Inter-macerial sediments consist of lime mud and scattered bioclasts. These Wuhai reefs are generally similar to but older than various other cambrian reefs previously reported from the Shandong region, northeastern China.

关键词： organosedimentary petrology reefal carbonate microbialite siliceous sponge cambrian series 3: guzhangian North China Platform

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