典型文献
Metamorphic Evolution of a Tremolite Marble from the Dabie UHP Terrane, China:A Focus on Zircon
文献摘要：
In this study, a tremolite marble from the Dabie ultrahigh-pressure (UHP) terrane, east-central China was investigated for its metamorphic evolution by focusing on zircon. The marble con-tains an amphibolite-facies assemblage of dolomite, Mg-calcite, tremolite, biotite, and plagioclase, while zircon in the marble witnesses a complex recrystallization and growth history under both amphibolite-and eclogite-facies conditions. Cathodoluminescence reveals eight characteristic zones for zircon. As in-dicated by mineral inclusions in zircon, two zones formed no earlier than amphibolite-facies retrogres-sion and are too thin to date. The other six zones contain inclusions of dolomite, aragonite, diopside (XNa=Na/(Na+Ca)=0.11-0.14), garnet (XCa=0.51-0.62, XMg=0.21-0.23, XFe=0.17-0.26, XMn=0.01), phengite and rutile, and formed under eclogite-facies conditions. Phase equilibria calculations illustrat that the Na-richest diopside formed under UHP conditions. Being an accessory eclogite-facies mineral in the marble, the analyzed chemistry of garnet inclusions cannot be reproduced by phase equilibria calcula-tions because solid-solution models for many other minerals don ' t incorporate Mn-endmembers. The eclogite-facies zircon zones show low HREE contents and flat MREE-HREE distribution patterns, which are interpreted to have been determined by the low bulk-rock HREE content instead of the pres-ence of accessary garnet in the marble. U-Pb dating yielded a large age dataset ranging from about 250 to 210 Ma for the eclogite-facies zircon zones. Statistically, the eclogite-facies ages are characterized by a Gaussian distribution with a median peak at 232 Ma. We propose that zircon experienced a"pro-tracted"recrystallization and/or growth history in the tremolite marble during the Triassic subduction and exhumation.
文献关键词：
中图分类号：
作者姓名：
Penglei Liu;Zhenmin Jin
作者机构：
School of Earth Sciences,China University of Geosciences,Wuhan 430074,China
文献出处：
引用格式：
[1]Penglei Liu;Zhenmin Jin-.Metamorphic Evolution of a Tremolite Marble from the Dabie UHP Terrane, China:A Focus on Zircon)[J].地球科学学刊（英文版）,2022(02):493-506
A类：
Tremolite,tremolite,eclogite,Cathodoluminescence,retrogres,XNa,Na+Ca,XCa,XMg,XMn,phengite,illustrat,accessary
B类：
Metamorphic,Evolution,Marble,from,Dabie,UHP,Terrane,China,Focus,Zircon,In,this,study,marble,ultrahigh,pressure,terrane,east,central,was,investigated,its,metamorphic,evolution,by,focusing,zircon,tains,amphibolite,facies,assemblage,dolomite,calcite,biotite,plagioclase,while,witnesses,complex,recrystallization,growth,history,under,both,conditions,reveals,eight,characteristic,zones,dicated,inclusions,two,formed,earlier,than,are,too,thin,date,other,six,contain,aragonite,diopside,garnet,XFe,rutile,Phase,equilibria,calculations,that,richest,Being,accessory,analyzed,chemistry,cannot,reproduced,phase,because,solid,solution,models,many,minerals,don,incorporate,endmembers,show,low,HREE,contents,flat,MREE,distribution,patterns,which,interpreted,have,been,determined,bulk,rock,instead,Pb,dating,yielded,large,dataset,ranging,about,Statistically,ages,characterized,Gaussian,median,peak,We,propose,experienced,tracted,during,Triassic,subduction,exhumation
AB值：
0.480105
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