大别山北淮阳构造带柳林辉长岩:新元古代晚期裂解事件的记录

陈玲; 马昌前; 佘振兵; 张金阳; 周红升; 王琳燕

Volume 31 Issue 4

Jul. 2006

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Article Navigation > Earth Science > 2006 > 31(4): 578-584

CHEN Ling, MA Chang-qian, SHE Zhen-bing, ZHANG Jin-yang, ZHOU Hong-sheng, WANG Lin-yan, 2006. Liulin Gabbro in the Beihuaiyang Tectonic Belt of the Dabie Orogen: A Witness of the Late Neoproterozoic Rifting Event. Earth Science, 31(4): 578-584.

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Liulin Gabbro in the Beihuaiyang Tectonic Belt of the Dabie Orogen: A Witness of the Late Neoproterozoic Rifting Event

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China Urtiversity of Geosciences, Wuhan 430074, China
3.
Department of City and Environmental Science, Xinyang Normal University, Xinyang 464000, China

Received Date: 2005-12-26
Publish Date: 2006-07-25

Abstract

Abstract

A number of gabbric plutons discontinuously crop out along the Liulin-Dingyuan-Wangmuguan region in the Beihuaiyang tectonic belt of north Dabie. They were previously considered to have been developed in a post-orogenic extensional setting. In this paper we present new data of zircon SHRIMP dating and EPMA chemical analysis results of pyroxenes and plagioclases from the Liulin gabbro at the northern foot of Jigongshan Mountain. SHRIMP U-Pb dating on magmatic zircons yielded an age of (611±13) Ma, which is interpreted as the crystallization time of the Liulin gabbro. The date is significantly older than the immediately adjacent Upper Ordovician Dingyuan Formation, revising the contact relationship between the gabbro body and its wall rock. Pyroxene is exclusively augite with high Na₂O, FeO and MnO contents, and plagioclase is low CaO andesine, which share characteristics with their counterparts from gabbros formed in an intra-plate setting and are largely different from those from gabbros associated with island arc or active continental margin. The results indicate that there may have been a continental rifting event in the north of the Dabie orogen during the late Neoproterozoic period.
- gabbro,
- zircon SHRIMP U-Pb dating,
- Neoproterozoic rifting event,
- Dabie orogen

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Liulin Gabbro in the Beihuaiyang Tectonic Belt of the Dabie Orogen: A Witness of the Late Neoproterozoic Rifting Event

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