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Ultrahigh-Pressure Metamorphism of the Sulu Terrane,Eastern China: A Prospective View

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Continental Dynamics 1998年第Z1期 34-55页

作者： R. Y. ZHANG and J. G. LIOU Department of Geological and Environmental Sciences, Stanford University, Stanford, CA 94305

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关键词： coesite eclogite garnet peridotite fluid/rock interaction ultrahigh P metamorphism Sulu terrane

Confirmation of the ultrahigh-pressure metamorphic belt in the Dabie Mountains and related problems

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Progress in Natural Science:Materials International 1999年第1期 16-24页

作者：徐树桐刘贻灿江来利苏文吴维平 Anhui Institute of Geology China Hefei 230001

The evidence To confirm the existence of the ultrahigh-pressure metamorphic belt (UHPMB) in the Dabie Mountains and the discovery of some typical ultrahigh-pressure minerals (such as coesite, diamond, magnesite and Ti-clinohumite) and rocks (such as coesite-bearing eclogite and quartz jadeitite) are summarized. Based on these data, the investigations to the Dabie Mountains by worldwide geologists and some related problems are reviewed.

关键词： coesite diamond quartz-jadeitite belt UHPMB Dabie Mountains.

Exhumation P-T path of UHP eclogites in the Hong'an area,western Dabie Mountains,China

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Exhumation P-T path of UHP eclogites in the Hong'an area,wes...

Ultrahigh Pressure Metamorphism and Tectonic Evolution of Southwestern Tianshan Orogenic Belt, China: A Comprehensive Review

中国科学院地质与地球物理研究所2006学术年会

作者： Jingbo Liu~a,Kai Ye~a,Min Sun~b a State Key Laboratory of Lithosphere Tectonic Evolution,Institute of Geology and Geophysics, Chinese Academy of Sciences,Beijing,100029,China b Department of Earth Sciences,The University of Hong Kong,Pokfulam Rd.,Hong Kong

Four generations of mineral assemblages have been identified in ultrahigh-pressure (UHP) eclogites from the Hong’an area,recording four metamorphic stages of the exhumation trajectory,i.e.,garnet+omphacite+kyanite+ zoisite/epidote+rutile+coesite formed at the UHP stage,garnet+omphacite+paragonite+phengite+amphibole+epidote+quartz at the high-pressure (HP) eclogitic stage,amphibole+epidote+albite-oligoclase+paragonite+quartz at the epidote-amphibolite facies(EA) stage,and actinolite+ albite and pumpellyite+albite+K-feldspar+muscovite+chlorite+margarite+epidote+quartz at the greenschist facies(GS) *** formed at the UHP stage was overgrown by atoll garnet at the HP stage. X-ray images,mineral compositions and compositional profiles indicate that the UHP garnet experienced a variable Fe-Mg modification in response to Fe-Mg exchange between garnet and omphacite prior to the overgrowth of atoll HP garnet.A volume diffusion zone was also observed between the UHP and HP *** following P-T conditions were estimated for these mineral assemblages:480 to 560℃and 2.5 to 2.9 GPa with median values of 520℃and 2.8 GPa at UHP stage,575 to 685℃and 1.6 to 1.9 GPa with the average results of 634±37℃and 1.8±0.06 GPa at the HP stage,500 to 640℃and 0.4 to 1 GPa at the EA stage,and 160 to 320℃and 0.2 to 0.8 GPa at the GS *** Hong’an UHP eclogites experienced a temperature increase of over 100℃from the UHP to HP stages and continued to exhume from the HP to EA stages through a process of approximately isothermal depression,which was followed by a significantly cooling from the EA to GS *** the process of exhumation,UHP eclogites witnessed a series of events involving fluid influx,resulting in the formation of hydrous minerals at different stages. The nature of fluids changed from K-rich at the HP stage to K-poor at the EA stage and then K-rich again at the GS stage.

关键词： UHP metamorphism Eclogite coesite P-T path Exhumation The Dabie Mountains

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Acta Geologica Sinica(English Edition) 2020年第S1期94卷 86-86页

作者： ZHANG Lifei WANG Yang ZHANG Lijuan Lü Zeng MOE Key Laboratory of Orogenic Belts and Crustal Evolution School of Earth and Space SciencesPeking UniversityBeijing 100871China

Recently, a huge ultrahigh-pressure(UHP) metamorphic belt of oceanic-type has been recognized in southwestern(SW) Tianshan, China. Petrological studies show that the UHP metamorphic rocks of SW Tianshan orogenic belt include mafic eclogites and blueschists, pelitic garnet phengite schists, marbles and serpentinites. The well-preserved coesite inclusions were commonly found in eclogites, garnet phengite schists and marbles. Ti-clinohumite and Ti-chondrodite have been identified in UHP metamorphic serpentinites. Based on the PT pseudosection calculation and combined U-Pb zircon dating, the P-T-t path has been outlined as four stages: cold subduction to UHP conditions before^320 Ma whose peak ultrahigh pressure is about 30 kbar at 500 ℃, heating decompression from the Pmax to the Tmax stage before 305 Ma whose peak temperature is about 600 ℃ at 22 kbar, then the early cold exhumation from amphibolite eclogite facies to epidote-amphibolite facies metamorphism before 220 Ma and the last tectonic exhumation from epidote amphibolite facies to greenschist facies metamorphism. Combining with the syn-subduction arc-like 333-326 Ma granitic rocks and 280-260 Ma S-type granites in the coeval low-pressure and high-temperature(LP-HT) metamorphic belt, the tectonic evolution of Tianshan UHP metamorphic belt during late Cambrian to early Triassic has been proposed in this paper.

关键词： ultrahigh pressure metamorphism Tianshan coesite cold subduction

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