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.
Last Update: 2017-03-31