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ULTRA-HIGHPRESSUREMETAMORPHISMANDGEOLOGICALEVOLUTIONINTHE BIXILINGAREA,ANHUI-APRELIMINARYSUMMARYOF1∶10000MAPPINGWORK

ZHUANG Yu- xun1,GAO Tian- shan2,TANG Jia- Fu2(1 The Bureau of Geological Survey of China,Beijing 100083,China)( 2 The Academy of Geological Survey of Anhui Province,Hefei 230001,China)  
Basically this paper describes the distribution and evolution history of geologic bodies on the basis of 1:10000 geological mapping in the Bixiling area,Dabie Mts.The ultra- high pressure (UHP) metamorphic rock series,whose protolith is equivalent to a suite of intermediate- basic volcanics- sedimentary rock series,mostly consists of light- colored,dark(basic)eclogites and (garnet )plagiogneiss series.The granitic rocks that have not been subjected to UHP metamorphism include gneissic granite and granodiorite porphyry,structurally juxtaposing with UHP metamorphic rock series. Their protolith may be resulted from granodiorite porphyry that underwent mylonitization reworking and ana- metasomatism.The geological evolution events are summed up as:in the mid- late Proterozoic a suite of volcanics- sedimentary crustoses were taken to upper mantle- lower crust by recycling process,then went through UHP etamorphism;subsequently,ca 700 Ma granodiorite porphyry emplaced and structurally juxtaposed with UHP metamorphic rock series by the later large ductile shearing;in the Indosinian period the rocks experienced ana- metasomatism to form semi- in- situ- type granites and rose to the shallow level of the crust.
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