Discovery and geological implication of rodingites derived from eclogites of ophiolites at Changawuzi, western Tianshan, China  

作　　者：LI Xuping ZHANG Lifei AI Yonglian 

机构地区：[1]Department of Geology,School of Earth and Space Sciences,Peking University,The Key Laboratory of Orogenic Belts and Crustal Evolution,MOE,Beijing 100871,China

出　　处：《Progress in Natural Science:Materials International》2003年第12期901-907,共7页自然科学进展·国际材料(英文版)

基　　金：SupportedbytheMajorStateBasicResearchDevelopmentProgramofChina (G19990 75 5 0 8) ;TRAPOYTofMOE ;theNationalNaturalScienceFoundationofChina (GrantNo .40 2 2 80 0 3 )andtheHomecomingFoundationofPersonnelStudiedAbroad (EJ2 0 0 3 0 0 3 3 )

摘　　要：We here report the first case of rodingites that were formed at the expense of eclogite enclosed in the ultramafic rocks of Changawuzi ophiolites. The rodingites contain a mineral assemblage of grossular, diopside, prehnite, chlorite, and relict omphacite and Fe Mg Al garnets. The presented data indicate that the formation of the rodingites resulted from a phase of secondary serpentinization during exhumation of the subducted oceanic plate. The rodingitization started at 370~410 ℃/6.5~8.5 kbar, while pervasive rodingitization took place under the condition of 200~350 ℃/4~6 kbar. The established PT path shows a retrograde track from eclogites to rodingites. We conclude that the process of rodingitization could also take place under subduction conditions in addition to its more common occurrence under ocean floor metamorphic conditions.We here report the first case of rodingites that were formed at the expense of eclogite enclosed in the ultramafic rocks of Changawuzi ophiolites. The rodingites contain a mineral assemblage of grossular, diopside, prehnite, chlorite, and relict omphacite and Fe Mg Al garnets. The presented data indicate that the formation of the rodingites resulted from a phase of secondary serpentinization during exhumation of the subducted oceanic plate. The rodingitization started at 370~410 ℃/6.5~8.5 kbar, while pervasive rodingitization took place under the condition of 200~350 ℃/4~6 kbar. The established PT path shows a retrograde track from eclogites to rodingites. We conclude that the process of rodingitization could also take place under subduction conditions in addition to its more common occurrence under ocean floor metamorphic conditions.

关 键 词：RODINGITE ECLOGITE SERPENTINITE SUBDUCTION western Tianshan. 

分 类 号：P588.3[天文地球—岩石学]