地质学报（英文版）2000，Vol.74Issue(4)：766-773,8.
Petrographic and SHRIMP Studies of Zircons from the Caledonian Xiongdian Eclogite, Northwestern Dabie Mountains
Petrographic and SHRIMP Studies of Zircons from the Caledonian Xiongdian Eclogite, Northwestern Dabie Mountains
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作者信息
- 1. Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China;Institute of Geology, Chinese Academy of Geological Science, Beijing 100037, China;China University of Geosciences, Wuhan 430074, Hubei, China;Australian National University, G.P.. O Box 4, Canberra, A. C. T., 2601, Australia
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摘要
Abstract
The Xiongdian eclogite occurring in the Sujiahe tectonic melange zone at Luoshan County,Henan Province,in the western Dabie Mountains,is typical high-pressure(HP)-ultrahigh-pressure(UHP)and mediumtemperature eclogite.The occurrence,internal texture and surface characteristics of zircons in eclogite were studied rather systematically petrographically combined with the cathodoluminescence(CL)and scaning electron microscope(SEM)methods.Zircons are mainly hosted in granet and other metamorphic growth texture in the interior,thus indicating that they are the product of metamorphism.SHRIMP analyses give zircon206Pb/238U ages of 335 to 424 Ma and show a certain degree of radiogenic Pb loss;therefore it may be inferred that the age of 424+5Ma represents the minimum age of a HP-UHP metamorhphic age.From the above analyses coupled with previous Sm-Nd,40Ar-39Ar,U-Pb and 207Pb/206Pb age data,it is suggested that the peak metamorphic age of the Xiongdian eclogite should be between 424 and 480Ma.This study further validate the view of the existence of a Caledonian HP-UHP metamorphic event in the western Dabie Mountains关键词
Dabie Mountains/Caledonian/eclogite/SHRIMP analysisKey words
Dabie Mountains/Caledonian/eclogite/SHRIMP analysis引用本文复制引用
..Petrographic and SHRIMP Studies of Zircons from the Caledonian Xiongdian Eclogite, Northwestern Dabie Mountains[J].地质学报（英文版）,2000,74(4):766-773,8.
