北秦岭早古生代两期变质作用: 来自松树沟基性岩岩石学及锆石U-Pb年代学的记录

李晔; 周汉文; 钟增球; 向华; 曾雯; 祁冬梅; 张利

doi:10.3799/dqkx.2012.S1.011

Volume 37 Issue S1

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LI Ye, ZHOU Han-wen, ZHONG Zeng-qiu, XIANG Hua, ZENG Wen, QI Dong-mei, ZHANG Li, 2012. Two Eopaleozoic Metamorphic Events in North Qinling: Petrology and Zircon U-Pb Geochronology Evidences from Basic Rocks in the Songshugou Area. Earth Science, 37(S1): 111-124. doi: 10.3799/dqkx.2012.S1.011

Citation:

LI Ye, ZHOU Han-wen, ZHONG Zeng-qiu, XIANG Hua, ZENG Wen, QI Dong-mei, ZHANG Li, 2012. Two Eopaleozoic Metamorphic Events in North Qinling: Petrology and Zircon U-Pb Geochronology Evidences from Basic Rocks in the Songshugou Area. Earth Science, 37(S1): 111-124. doi: 10.3799/dqkx.2012.S1.011

Citation:

LI Ye, ZHOU Han-wen, ZHONG Zeng-qiu, XIANG Hua, ZENG Wen, QI Dong-mei, ZHANG Li, 2012. Two Eopaleozoic Metamorphic Events in North Qinling: Petrology and Zircon U-Pb Geochronology Evidences from Basic Rocks in the Songshugou Area. Earth Science, 37(S1): 111-124. doi: 10.3799/dqkx.2012.S1.011

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Two Eopaleozoic Metamorphic Events in North Qinling: Petrology and Zircon U-Pb Geochronology Evidences from Basic Rocks in the Songshugou Area

doi: 10.3799/dqkx.2012.S1.011

LI Ye^{1, 2
,},
ZHOU Han-wen^{1, 2, 3
,
,},
ZHONG Zeng-qiu^{1, 2},
XIANG Hua^{1, 2},
ZENG Wen³,
QI Dong-mei^{1, 2},
ZHANG Li¹

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China
3.
Three Gorges Research Center for Geo-hazard of Ministry of Education, China University of Geosciences, Wuhan 430074, China

Received Date: 2011-08-15
Available Online: 2021-11-15
Publish Date: 2012-05-01

Abstract

Abstract

Recognition of multiple metamorphic events can provide essential evidences to constrain the evolution history of a polycyclic orogen. The basic rocks in the Songshugou area have recorded two metamorphic events in Eopaleozoic, which is an important "fingerprint" to study the evolution of North Qinling. The field work and petrology research show that the Songshugou garnet amphibolites are distributed as lens, with increasing retrograde degree transiting to plagioclase amphibole schists towards the edge of the lens. Zoned amphiboles are widely developed in plagioclase amphibole schists and those bearing garnet relics from the highly retrograded belt, with compositions ranging from actinolite in cores to magnesiohornblende in rims, which suggests that metabasic rocks have initially retrograded from granulite to amphibolite to greenschist facies, and then been overprinted by later low amphibolite facies metamorphism. According to petrologic study, zircon U-Pb geochronology reveals that the metabasic rocks record two Eopaleozoic events, too: 1. After having been experienced granulite or amphibolite facies metamorphism at the age of 484±4 Ma, metabasic rocks retrograded to greenschist facies; 2. The growth of amphibole zoning resulted from a later thermal event at the age of 418±5 Ma.
- North Qinling,
- basic rocks,
- Eopaleozoic,
- metamorphism,
- amphibole zone,
- zircon U-Pb geochronology,
- petrology,
- mineral chemistry

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References(87)

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沈阳化工大学材料科学与工程学院沈阳 110142

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Two Eopaleozoic Metamorphic Events in North Qinling: Petrology and Zircon U-Pb Geochronology Evidences from Basic Rocks in the Songshugou Area

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