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Petrology and ^(40)Ar/^(39)Ar iso-topic ages of blueschists in Gangmar, central Qiangtang, northern Tibet

chinese Science Bulletin 2001年第5期46卷 423-427页

作者： deng xiguang, ding lin,{2., institute of Geology and geophysics, chinese academy of sciences, beijing 100029. china Laboratory of lithospheric tectonic {2. Institute of Geology and Geophysics Chinese Academy of Sciences Beijing China

The petrology and mineral assemblages of blueschists in the Gangmar, central Qiangtang, northern Tibet were examined, which indicates that the metamorphic condition is high-pressure low-temperature. In this note, we reported the 40Ar/39Ar dating results of glaucophane from two blueschist samples. Their apparent ages are (2.5.0±1.3) Ma and (2.7.6±2.3) Ma and similar isochron ages are (2.5.0±0.9) Ma and (2.2.4±0.8) Ma, respectively. These iso-topic datings show the high-pressure metamorphism occurring in Lower Permian. The ages also coincide with the evolution of Palaeo-Tethys ocean in Late Palaeozoic.

关键词： glaucophane blueschist 39Ar/40Ar age Palaeo-Tethys Gangmar northern Tibet.

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A Synthesis of Geophysical Data in Southeastern North china Craton:Implications for the Formation of the Arcuate Xuhuai Thrust Belt

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Journal of Earth Science 2022年第3期33卷 552-566页

作者： Yangfan deng Yun Chen Pengfei Li zhou Zhang JoséBadal State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of SciencesGuangzhou 510640China CAS Center for Excellence in Deep Earth Science Guangzhou 510640China State Key Laboratory of lithospheric evolution Institute of Geology and GeophysicsChinese Academy of SciencesBeijing 100029China Physics of the Earth Sciences BUniversity of ZaragozaPedro Cerbuna 1250009 ZaragozaSpain

The Xuhuai fold thrust belt(XHTB)is a curved structure in the southeastern margin of the North china Craton(NCC)that has attracted great attentions due to its tectonic and petrological ***,few geophysical studies have focused on the deep structure of this *** this study,we carry out a systematic demonstration of the main geophysical features that characterize the XHTB and surroun{2. *** results reveal small negative gravity and magnetic anomalies,thin crust and lithosphere,lower shear velocity and shallower earthquake epicenters relative to other areas of the NCC,collectively indicating a lithospheric-scale rheological anomaly at this *** magnetic alignments show a trend similar to that of geological units in southeastern NCC and adjacent areas,although they differ from the SKS-splitting fast polarization directions,except in the Qinling-Dabie orogen where a vertical coherent deformation of the crust and mantle may be involved *** on the geophysical data,we propose a detachment-controlled model,which was caused by the different detachment depth/strength,for the formation of XHTB to explain its arcuate shape as well as the magnetic alignments,thus provi{2. new insight into the deep processes of southeastern NCC.

关键词： gravity and magnetic anomalies shear wave velocity seismicity seismic anisotropy magnetic alignments arcuate structure

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