扬子克拉通北缘碎屑沉积岩地球化学特征及意义

周炼; 高山; 刘勇胜; 凌文黎; 张利

Volume 32 Issue 1

Jan. 2007

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ZHOU Lian, GAO Shan, LIU Yong-sheng, LING Wen-li, ZHANG Li, 2007. Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton. Earth Science, 32(1): 29-38.

Citation:

ZHOU Lian, GAO Shan, LIU Yong-sheng, LING Wen-li, ZHANG Li, 2007. Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton. Earth Science, 32(1): 29-38.

ZHOU Lian, GAO Shan, LIU Yong-sheng, LING Wen-li, ZHANG Li, 2007. Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton. Earth Science, 32(1): 29-38.

Citation:

ZHOU Lian, GAO Shan, LIU Yong-sheng, LING Wen-li, ZHANG Li, 2007. Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton. Earth Science, 32(1): 29-38.

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Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton

State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China

Received Date: 2006-04-06
Publish Date: 2007-01-25

Abstract

Abstract

This paper presents Sm-Nd and geochemical data on fine-grained sediments of the north margin from the Yangtze craton, China. Systematic research leads to the following conclusions: (1) Nd isotope composition of the clastic sedimentary rocks from the Middle-Upper Proterozoic has the ε_Nd(t) values of +2.72 to +0.69, with the Nd model ages of 1.40 Ga and 1.57 Ga, which corresponds to that of the contemporaneous volcanic rocks from Xixiang Group. It indicates that the arc materials from the Proterozoic control the geochemical composition of main provenances of the Middle-Upper Proterozoic sedimentary rocks. (2) The probable provenances of the Paleozoic sedimentary rocks are dominantly the recycled products of Proterozoic crust as indicated by the decrease of the ε_Nd(t) with the time. The sedimentary rocks from the Cambrian-Silurian were derived ultimately from a polycyclic mixture of the old continental crust materials from the Kongling strata and arc materials from the Proterozoic volcanic in the north margin of the Yangtze craton. The derivation is markedly of sources relatively more felsic extreme weathering. The geochemical and isotopic data indicate that the provenance of Devonian terrain has changed with the progressively increasing proportions of materials from the Qinling complex by erosion. (3) The more prominent increase in the ε_Nd(t) values of the Upper Permian formation probably reflects the significant incorporation of the mantle-derived materials. The comparison between the data of trace element and the data of EMS indicates that the dust of volcano from EMS was related to the Late Permian strata during the Late Permian when the volcanism, represented by Emeishan flood basalts (251-258) in the south-western margin of the Yangtze block was extremely active.
- northern margin of Yangtze craton,
- Sm-Nd isotope,
- trace element,
- clastic sedimentary rocks

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Geochemistry and Implications of Clastic Sedimentary Rocks from the Northern Margin of Yangtze Craton

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