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Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance(PDF)

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

Issue:
2017年第02期
Page:
143-160
Research Field:
基础地质与矿产地质
Publishing date:

Info

Title:
Paleoproterozoic Granites and Meta-mafic Rocks from Yingkou-Liaoyang Area of the Eastern Liaoning and Their Significance
Author(s):
LI Chao SUN Ke-ke CHEN Bin
1. School of Earth and Space Sciences, Peking University, Beijing 100871, China; 2. School of Resources and Environmental Engineering, Hefei University of Technology, Hefei 230009, Anhui, China
Keywords:
granite mafic rock Paleoproterozoic zircon U-Pb age geochemistry back-arc basin Jiao-Liao-Ji Belt North China Craton
PACS:
P588.12
DOI:
-
Abstract:
Paleoproterozoic geological records are well preserved in the eastern Liaoning. The zircon U-Pb dating, geochemical and petrogenesis of Paleoproterozoic granites (Jianyi granite) and meta-mafic rocks (Longchang meta-diabase and Suanpanyu meta-gabbro) in Yingkou-Liaoyang area of the eastern Liaoning were studied. The results show that LA-ICP-MS zircon U-Pb ages of Jianyi granite, Longchang meta-diabase and Suanpanyu meta-gabbro are (2 322±18), (2 335±21), (2 353±22)Ma, respectively; Jianyi Granite forms from partial melting of Archean crust, and belongs to metaluminous-calcalkaline I-type granite, and is enriched in large ion lithophile element (LILE), and is depleted in high field strength element (HFSE), showing the characteristics of magma in subduction zones; Longchang meta-diabase and Suanpanyu meta-gabbro belong to enriched mid-ocean ridge basalts (E-MORB) and have the geochemical characteristics of island arc; Longchang meta-diabase is generated from partial melting of Neoarchean mantle which is not very enriched, and the diabase is contaminated by juvenile crust during upwelling; Suanpanyu meta-gabbro is produced from partial melting of Paleoarchean-Mesoarchean enriched mantle; Liaoning-Jilin region is a continental back-arc basin in Early Paleoproterozoic, and the strong extension in the back-arc region results in partial melting of continental lithosphere, which generates the granites and meta-mafic rocks; these rocks are later metamorphosed, deformed and pushed together in later processes of terrane amalgamation.

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Last Update: 2017-03-31