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Deformation and 40ar/39ar thermochronology on the mylonites from south Tan-Lu fault:The geological significance

Deformation and 40Ar/39Ar thermochronology on the mylonites ...

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第九届全国固体核径迹学术研讨会

作者： X.Y.YANG~(1,2) 1.CAS Key Laboratory of Crust-Mantle Materials and Environments,School of Earth and Space Sciences,University Science and Technology of China,Hefei 230026,China 2.CAS Key Laboratory of Isotope Geochronology and Geochemistry,Guangzhou Institute of Geochemistry,Guangzhou,510640,China

Tan-Lu fault belt is an important deep fault belt in east China and Asian continent,and its southern part is the key part for geology,where the series of mylonites were developed in the ductile shear zones since its shifting *** plastic deformation is commonly occurring in the *** deformed biotite and feldspar may record the chronological information since the period of deformation,the age from the deformed minerals may represent the important period of the history of deformation and even the shifting movement of the fault *** and plagioclase samples separated from the mylonite samples were determined by 40ar/39ar fast neutron activation *** the basis of the deformed minerals with microscope and TEM observation,the stop-heating technique is hired here for determination of ar/ar *** ages from single minerals were obtained with the plateau ages of and isoclines ages of 98.49± 0.32Ma-113.89±0.31Ma and 98.80±0.19Ma-113.99±0.27Ma,*** two types of ar/ar thermochronology ages are well consistent,so that the convinced deformed ages are supposed to be 98Ma-114 *** 40ar/39ar thermochronology ages may represent the cooling ages of the shifting movement of Tan-Lu fault belt.

关键词： ductile shear zones plastic deformation mlonites 40ar/39ardating Tan-Lu fault belt

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