| 苏鲁地区中寒武统张夏组藻灰岩及沉积相 |
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| 引用本文： | 江茂生,沙庆安.苏鲁地区中寒武统张夏组藻灰岩及沉积相[J].沉积与特提斯地质,1996,16(5):12-17. |
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| 作者姓名： | 江茂生 沙庆安 |
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| 作者单位： | 中国科学院地质研究所 |
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| 摘 要： | 鲁西、苏北地区中寒武统张夏组上部主要是藻灰岩与鲕粒灰岩互层沉积。根据藻类的宏观结构可划分为藻礁、藻叠层石、藻丘及藻斑块。显微镜下观察藻类主要由Ｅｐｉｐｈｙｔｏｎ组成。根据沉积相分析，研究区自东南而西北张夏组上部可划分为藻礁相、鲕粒滩相及藻坪相。藻灰岩的沉积与环境条件是密切相关的，其主要影响因素有海平面变化、沉积速率、碎屑物源供应及水动力条件等。
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| 关 键 词： | 苏鲁地区，张夏组，藻灰岩，沉积相，环境条件 |
| 收稿时间： | 1996/1/23 0:00:00 |
ALGAL LIMESTONES AND THEIR SEDIMENTARY FACIES IN THE ZHANGXIA FORMATION (MIDDLE CAMBRIAN),NORTH JIANGSU-WEST SHANDONG REGION |
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| Jiang Maosheng,Sha Qing''an.ALGAL LIMESTONES AND THEIR SEDIMENTARY FACIES IN THE ZHANGXIA FORMATION (MIDDLE CAMBRIAN),NORTH JIANGSU-WEST SHANDONG REGION[J].Sedimentary Geology and Tethyan Geology,1996,16(5):12-17. |
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| Authors: | Jiang Maosheng Sha Qing'an |
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| Institution: | Institute of Geology, Chinese Academy of Sciences |
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| Abstract: | The upper part of the Zhangxia Formation (Middle Cambrian) in the North JiangsuWest Shandong region consist dominantly of the intercalations of algal limestones and oolitic limestones. Macroscopically the algae may be divided into reef, stromatolite mound and biscuit,and microscopically are mostly composed of piphyton. Three distinct factes have been distinguished in the upper part of the formation on the basis of sedimentary factes analysis:the algal reef factes,oolitic shoal factes and algal-flat factes. The environmental factors such as sea-level changes,depositional rates,sediment supply and hydrodynamical conditions are all responsible for the formation of the algal limestones in the study area. |
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| Keywords: | North Jiangsu-West Shandong region Zhangxia Formation algal limestone sedimentary factes environment and condition |
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