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Investigation on the metamorphic conditions and geochronology for the magnet garnet amphibole in the Tan-Lu Fault Zone( Anhui segment),and discussion of its tectonic attribution
Author(s): NIE Feng, SHI YongHong, WANG Juan, KANG Tao, CAO Sheng, School of Resources and Environment Engineering, Hefei University of Technology
Pages: 1718-
1730
Year: 2014
Issue:
6
Journal: Acta Petrologica Sinica
Keyword: Magnet garnet amphibole; Isobaric cooling; Zircon U-Pb age; Tan-Lu Fault Zone;
Abstract: Based on the research of tectonic geology and lithology,The magnet garnet amphibole and its adjacent rock occurs as the tectonic lens in the south of Feidong terrane. This metamorphic rocks contain two metamorphic assemblages from different stages,and the P-T estimates show that the P-T condition of ① stage is T = 616 ~ 700℃ and P = 0. 66 ~ 0. 85GPa respectively and the average T and P are 653 ± 35℃ and 0. 75 ± 0. 09GPa; Differentially,the ② stage is T = 616 ~ 700℃ and P = 0. 66 ~ 0. 85GPa,and average PT condition is 653 ± 35℃ and 0. 75 ± 0. 09GPa. A rapid and slight Isobaric cooling process is indicated by features from the first stage to the second stage. According to the Raman Spectral Analysis and the LA-ICPMS dating,the metamorphic age of the magnet garnet amphibole is 2469 ± 49Ma. Combined with geological background and current situation,The magnet garnet amphibole maybe come from north china plate because of the sinistral strike-slip of Tan-Lu Fault Zone,It could be further theorized that the width of Tan-Lu Fault Zone is up to 10 ~ 15km.
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