| 上扬子区志留纪层序地层特征 |
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| 引用本文： | 陈建强,李志明.上扬子区志留纪层序地层特征[J].沉积学报,1998,16(3):58-65. |
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| 作者姓名： | 陈建强 李志明 |
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| 作者单位： | 1.中国地质大学地质矿产系 北京 100083; |
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| 基金项目： | 国家基础性研究重大项目“中国古大陆及其边缘层序地层和海平面变化研究”成果 |
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| 摘 要： | 在稳定的上扬子地区，对志留系（439～409Ma）进行了露头层序地层研究，建立了2个二级层序（不完整）和9个三级层序（OS1- OS9），每个三级层序的时限约3.3Ma, OS1由龙马溪组和香树园组构成。雷家屯组包括2个三级层序。OS4由马脚冲组和溶溪组构成。秀山组和回星哨组构成OS5和OS6层序。OS7位于关底组下部。由关底组上部和妙高组下部组成OS8。OS9由妙高组上部和玉龙寺组构成。OS1和OS7为Ⅰ型层序，其余为Ⅱ型层序。三级层序均发育TST和HST，而缺乏LST和SMST。层序的发育与全球海平面变化有密切关系。加里东运动造成的扬子地台持续上升及差异升降对二级层序的组成具有明显的影响。
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| 关 键 词： | 层序地层 海平面变化 志留纪 上扬子区 中国 |
| 收稿时间： | 1997-05-10 |
Silurian Sequence Stratigraphy of Upper Yangtze Region,China |
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| Chen Jianqiang,\ Li Zhiming,\ Gong Shuyun,\ Li Quanguo,\ Su Wenbo.Silurian Sequence Stratigraphy of Upper Yangtze Region,China[J].Acta Sedimentologica Sinica,1998,16(3):58-65. |
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| Authors: | Chen Jianqiang \ Li Zhiming \ Gong Shuyun \ Li Quanguo \ Su Wenbo |
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| Institution: | 1.Department of Geology and Mineral Resources, China University of Geosciences, Beijing 100083;2.Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074 |
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| Abstract: | The northeastern Guizhou and the eastern Yunnan are located on the Upper Yangtze Platform. The present study on seven sections in the region has established nine 3rd order sequences from the Llan-dovery (439 Ma) to the Pridoli (409 Ma), with an average duration of 3.3 Ma. The nine 3rd order se-quences have constituted two 2nd order sequences. The first sequence consists of Longmaxi Fm. and Xi-angshuyuan Fm., extending chronologically from Rhuddanian to Early Telychian, with a distinct type-Ⅰ sequence boundary at the bottom. Basinward, the bottom boundary shows as continuity at Tongzi belong-ing to Gui zhou, while landward to the central Gui zhou old land it becomes an overlap disconformity. Two 3rd order sequences have been recognized in the Lei jiatun Fm. The Majiaochong Fm. (TST) and Rongxi Fm. (HST) make up the fourth sequence. The fifth and the sixth sequences are represented by the Xiushan Fm. and Huixingshao Fm. respectively. The sequence boundary between them, however, is notconcurring with the boundary of the formations. The second to fifth sequences are within the Telychian, and the sixth sequence is early Sheinwoodian in age. The seven to the ninth sequences are represented by the Guandi Fm. the Miaogao Fm. and the Yulongsi Fm. extending chronologically from the Homerian stage belonging to Wenlock to Pridoli. The first sequence and the seventh sequence among these nine se-quences are type-Ⅰ sequences, the others type-Ⅱ sequences. The above mentioned nine sequences are basically controlled by eustatic changes. Owing to the ef-fects of the Caledonian movement, the steady uplifting of the Yangtze Platform during Silurian had ap-parent lyexerted an influence on the formation and the characters of the sequences. From the bottom up-ward, in each of the 3rd order sequences, the ratio of siliciclastics increases continuously with a corre-sponding increase in the thickness of sequence. In all of the third-order sequences, TST and HST are well displayed, but without LST and SMST. |
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| Keywords: | sequence stratigraphy\ sea level change\ Silurian\ Upper Yangtze region\ China |
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