大别山英山和熊店榴辉岩单颗粒锆石SHRIMPU-Pb年代学研究

高山; 凌文黎; McNaughtonNeal J.; 张本仁; 张国伟; 张泽明; 钟增球; 索书田

Volume 27 Issue 5

Sep. 2002

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Article Navigation > Earth Science > 2002 > 27(5): 558-564

GAO Shan, LING Wen-li, McNaughton Neal J., ZHANG Ben-ren, ZHANG Guo-wei, ZHANG Ze-ming, ZHONG Zeng-qiu, SUO Shu-tian, 2002. SHRIMP Single Zircon U-Pb Geochronology of Eclogites from Yingshan and Xiongdian. Earth Science, 27(5): 558-564.

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SHRIMP Single Zircon U-Pb Geochronology of Eclogites from Yingshan and Xiongdian

1.
Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
2.
Department of Geology, Northwest University, Xi'an 710069, China
3.
Key Center for Teaching and Research in Strategic Mineral Deposits, the University of Western Australia, Nedlands 6907, Perth, Australia
4.
Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100081, China

Received Date: 2001-10-15
Publish Date: 2002-09-25

Abstract

Abstract

Zircons of eclogites from Xiongdian (Luoshan, Henan) and Mifengjian (Yingshan, Hubei) are dated by the SHRIMP U-Pb method. The Yingshan coesite-bearing ultrahigh-pressure eclogite shows four age groups: (773±20) Ma, (730±16) Ma, (461±7) Ma and (262±6) Ma, with the dominance of the (461±7) Ma group. The Xiongdian high-pressure eclogite shows three age groups of (449±14) Ma, (307±14) Ma and (216±4) Ma. The ca. 450 Ma age is present in eclogites from both localities. They have extremely low Zr (9×10^-6-19×10^-6). Together with the MORB-like trace element characteristics and ε_Nd (+6.56 at 450 Ma), the age suggests an early Paleozoic high-and ultrahigh-pressure metamorphic event probably related to the subduction of oceanic crust and associated arc materials. The coexisting Ordovician and Triassic ages in the Xiongdian eclogite also suggest that the northern boundary of the Dabie high and ultrahigh-pressure metamorphic belt, regardless of time, is to the north of Xiongdian.
- high-and ultrahigh-pressure metamorphic belt,
- eclogite,
- zircon U-Pb age,
- SHRIMP,
- Paleozoic,
- Dabieshan mountain

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References(22)

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