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The petrochemistry of the Lower Proterozoic metamorphic rocks from the Dabieshan-Lianyungang area, the southeastern margin of the North China Platform

Published online by Cambridge University Press:  05 July 2018

Sang Longkang
Sang Longkang*
Affiliation:
China University of Geosciences, Wuhan 430074, P.R. China
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Abstract

Based on geological studies, 141 rock analyses and 5 trace element analyses of metabasites, the present paper deals with the rock association, chemical features, protolith formation and the original tectonic settings upwards through the Lower Proterozoic metamorphic strata in the Dabieshan-Lianyungang area, in the south-east of the North China Platform. The results of the study indicate that the lower and middle parts of the metamorphic strata comprise terrigenous clastics, phosphoritic and aluminous sedimentary formations which formed under stable continental margin conditions. In the middle-upper part a calc-alkaline volcano-sedimentary formation under the active continental margin was developed. The Lower Proterozoic meta-strata of sedimentary-volcanosedimentary origin from bottom upwards suggest that the tectonic evolution of the south-eastern margin of the North China Platform is a process from stabilization to mobilization. This process suggests a northward subduction of the Yangtze Plate under the North China Plate during the later part of the early Proterozoic.

Keywords

metabasitespetrochemistryNorth China Platform
Type
Petrology
Information
Mineralogical Magazine , Volume 55 , Issue 379 , June 1991 , pp. 263 - 276
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 1991

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