| 南秦岭寒武-奥陶纪碳酸岩台地演化 |
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| 引用本文： | 崔智林,孟庆仁.南秦岭寒武-奥陶纪碳酸岩台地演化[J].沉积学报,1997,15(1):161-167. |
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| 作者姓名： | 崔智林 孟庆仁 |
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| 作者单位： | 西北大学, 西安 710069; |
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| 摘 要： | 南秦岭早古生代碳酸岩台地属于扬子板块北部被动大陆边缘。台地经历了３个演化阶段:①下-中寒武统缓坡沉积阶段；②中寒武统-下奥陶统镶边陆棚沉积阶段；③中-上奥陶统混合陆棚沉积阶段。下志留统的进积陆源碎屑沉积淹没了全区。从台地相带的展布规律和古地理轮廓推测，早古生代时台地北侧可能存在一个已消失了的古陆。
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| 关 键 词： | 碳酸岩台地 古地理 早古生代 秦岭 |
| 收稿时间： | 1995-05-20 |
Evolution of Early Palaeozoic Carbonate Platform, South Qinling Mt. |
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| Cui Zhilin,Mei Zhichao,Meng Qingren,and Qu Hongjun.Evolution of Early Palaeozoic Carbonate Platform, South Qinling Mt.[J].Acta Sedimentologica Sinica,1997,15(1):161-167. |
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| Authors: | Cui Zhilin Mei Zhichao Meng Qingren and Qu Hongjun |
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| Institution: | Department of Geology Northwest University Xi'an 710069;2 Institute of Geophysics Chinese Academy of Sciences Beijing 100083 |
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| Abstract: | Early Palaeozoic carbonate platform of South Qinling Mt. was developed on the north passive margin of the Yangtze plate. Cambrian and Ordovician carbonate stratigraphy, more than 2000 metres in thickness, is outcropped between Shanyang Fengzhen Fault and Ningshan Baihe Fault(Fig.1). Five facies associations are recognized, including anoxic/dysaerobic facies association(A1),deeper ramp/slope facies association(A2), Shoal facies association(A3),lagoon and tidal flat facies association(A4) and mixed shelf facies association(Fig.2). Evolution of the carbonate platform is divided into three phases(Fig.3). Middle Cambrian Early Ordovician rimmed shelf phase is characterised by occurrence of a south edge builtup of shoal facies association up to 500 metres in thickness and a south slope of nodular limestone, micritic limestone, clay shale and breccias. Inner platform deposits are composed of cyclic lagoonal massive dolostone and laminated dolostone, recording small scale sea level changes. Evident fall in sea level resulted from tectonic uplift led to existence of late Early Ordovician palaeokarst and karst conglomerates, which are capped by Middle Late Ordovician mixed shelf facies association of the third phase containing a transgressive and regressive cycle. Horizontal distribution of facies zones proves lee side of platform northward and wind side southward. It also implies that there was a possible ancient land on north side of platform(Fig.4), but it was probably submerged under Shanyang Fengzhen Fault afterwards. |
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| Keywords: | carbonate platform paleogeography early paleozoic Qinling mountains |
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