SHRIMP U-Pb and Sm-Nd dating of the gabbro and syenite from the Hongge ore district in western Panzhihua and its geological significance

LI Huaqin; WANG Denghong; ZHANG Liguo; REN Haitao; WANG Xiaodi; JIA Xiaohui; YANG Wenqiang

2017 Vol. 36, No. 5

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LI Huaqin, WANG Denghong, ZHANG Liguo, REN Haitao, WANG Xiaodi, JIA Xiaohui, YANG Wenqiang. SHRIMP U-Pb and Sm-Nd dating of the gabbro and syenite from the Hongge ore district in western Panzhihua and its geological significance[J]. Geological Bulletin of China, 2017, 36(5): 698-705.

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LI Huaqin, WANG Denghong, ZHANG Liguo, REN Haitao, WANG Xiaodi, JIA Xiaohui, YANG Wenqiang. SHRIMP U-Pb and Sm-Nd dating of the gabbro and syenite from the Hongge ore district in western Panzhihua and its geological significance[J]. Geological Bulletin of China, 2017, 36(5): 698-705.

SHRIMP U-Pb and Sm-Nd dating of the gabbro and syenite from the Hongge ore district in western Panzhihua and its geological significance

1.
Wuhan Center of Geological Survey, CGS, Wuhan 430205, Hubei, China
2.
Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037, China
3.
No. 106 Geological Party, Sichuan Bureau of Geology and Mineral Resources Exploration, Chengdu 611130, Sichuan, China

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Corresponding author: WANG Denghong, wangdenghong@sina.com

Received Date: 18 September 2016

Revised Date: 27 February 2017

Publish Date: 25 May 2017

Abstract

Abstract

Adopting the SHRIMP U-Pb and Sm-Nd method, this paper reported the dating results of the bedded ore-bearing gab-bros and alkaline syenites from the Hongge ore district in western Panzhihua area.The results show that the zircons from gabbro in Hongge have ages of 258.4±4.1Ma, 1841±34Ma and 2487±12Ma, the Sm-Nd isochron age of the gabbro, pyroxene and apatite sam-ples is 253±14Ma, while the zircon U-Pb age of alkaline syenite is 257.2±1.5Ma.These data show that the zircon U-Pb age (258Ma) of the typical mafic rock is similar to the Sm-Nd isochron age of the same samples, and also similar to the zircon U-Pb age of syenite.Considering the close relationship between layered gabbro and alkaline syenite rock in space and in time, it is suggested that both of them resulted from Permian Magmatism, but 1841Ma and 2487Ma zircon might have been magmatic zircon and inherit-ed zircons, which originated from the basement.These data imply the existence of Paleo-Petrozoic or even Archean materials in the lower part of Kangdian axis magmatic rock belt or the crystalline basement.
- Panxi area (western Panzhihua) ore district /
- syenite /
- gabbro /
- SHRIMP zircon U-Pb dating /
- Sm-Nd isochron

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