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Episodic Growth and Multiple Modification of Precambrian Lower Crust in the Southeastern Margin of North China Craton: Petrologic,Geochronological and Hf-isotopic Evidences(PDF)

《地球科学与环境学报》[ISSN:1672-6561/CN:61-1423/P]

Issue:
2012年第04期
Page:
1-11
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Episodic Growth and Multiple Modification of Precambrian Lower Crust in the Southeastern Margin of North China Craton: Petrologic,Geochronological and Hf-isotopic Evidences
Author(s):
LIU Yi-can1; 2;  WANG An-dong1; 2
1. Key Laboratory of Crust-mantle Materials and Environments,Chinese Academy of Sciences,Hefei 230026, Anhui, China; 2. School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, Anhui, China
Keywords:
zircon;  U-Pb geochronology;  Hf-isotope;  granulite-facies metamorphism;  lower crust;  episodic growth;  Precambrian;  North China Craton
PACS:
P588.3
DOI:
-
Abstract:
The early Precambrian is regarded to be a crucial stage for continental crust formation. The Precambrian lower-crustal rocks in the southeastern margin of North China Craton occur as the exposed metamorphic basement(named as the Wuhe metamorphic complex)and xenoliths in the Mesozoic dioritic to monzodioritic porphyry. These rocks provide an excellent natural laboratory to study formation and evolution of the Precambrian lower crust in the region. Integrated investigations on metamorphic petrology, petrologic geochemistry, Hf-isotope and zircon U-Pb geochronology of the rocks suggested that the Precambrian lower crust beneath the studied region experienced an episodic growth and multiple modification history. Intensive tectono-thermo events and metamorphic overprinting mainly occurred at several peaks, such as 2.5-2.6, 2.1, 1.8-1.9 Ga and 390, 176 Ma. For the 2.5-2.6 Ga lower-crustal rocks, some of them with high radiogenic Pb-isotopic compositions, which were similar to those formed at 2.1 Ga subduction-related arc setting and underwent 1.8 Ga high-pressure granulite-facies metamorphism, suffered from high-pressure granulite-facies metamorphism at 2.1 Ga and(or)1.8-1.9 Ga, and subsequent metamorphic overprinting at 390 Ma and 176 Ma; however, others had low radiogenic Pb-isotopic compositions for typical Precambrian lower-crustal rocks, and formed at 2.55-2.64 Ga and underwent 2.48-2.49 Ga peak metamorphism of granulite-facies without record of post-peak metamorphic overprint at 2.1 Ga and(or)1.8-1.9 Ga. Therefore, they formed simultaneously, but probably located at different crustal levels and escaped from subsequent metamorphic overprinting, strongly depending on their formation depths. The 2.7-2.8 Ga ages defined by inherited zircons and depleted mantle zircon-Hf model ages could record an earlier crustal growth episode in the area.

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