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Laser probe ^(40)Ar/^(39)Ar dating of mica on the deformed rocks from Altyn Fault and its tectonic implications,western china

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Chinese science Bulletin 2001年第4期46卷 322-325页

作者： liu yongjiang, ye huiwen,{2., chen wen, liu junlai, ren shoumai & pan hongxuncollege of earth sciences, changchun University of science and technology, changchun 130061, china Graduate School, china University of {12.osciences, Beijing 100083, china Laboratory of Isotopic {12.ochronology, Institute of {12.ology, Ministry of Land and Resources of china, Beijing 100037, china College of earth {2. Changchun University of Science and Technology Changchun China Graduate School China University of Geosciences Beijing China Laboratory of Isotopic geochronology Institute of Geology Ministry of Land and Resources of China Beijing China

The samples of Caledonian mylonitized granite and Jurassic meta-sedimentary rocks were collected in the north of Dangjinshan Pass, Qaidam gate fault-valley and gesi fault-valley. Detailed studies under the microscope and electronic microscope suggest that all the samples contain the syntectonic-growing minerals such as white mica, chlorite, sericite, biotite, etc. By dating these minerals, we got a group of 40Ar/39Ar laser probe isochronal ages of 89-92.Ma and apparent ages of (46.6±6.4) Ma. The ages ranging from 97 to 46 Ma were reported for the first time in the isotopic dating researches of the Altyn Fault The isochronal age group of (98-89) Ma indicates that a ductile strike-slip event, with low-grade metamorphism, began in late Cretaceous. This suggests that the strike-slip movement of the Altyn Fault should be related to the formation of the so-called west tectonic syntaxis in the Nepal-western Kunlun area.

关键词： Altyn Fault 40Ar/39Ar age strike-slip movement.

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RESEARCH PROGRESS OF ALTYN FAULT IN WESTERN china

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地学前缘 2000年第S1期7卷 243-244页

作者： ge xiaohong,{2., liu yongjiang, liu junlai, pan Hongxun, ren shoumai (College of earth sciences, changchun University of {12. and technology, changchun 130061,china)

As the northern boundary of Tibetan Plateau, the Altyn strike\|slip fault in western china has a very important implication to the tectonic division in the middle Asia continent, and has become a hot topic for the research on continental dynamics of Tibetan Plateau. During the research of our project funded by NSFC, we collected a sample of Caledonian mylonitized granite in the north of Dangjin pass and two samples of Jurassic meta\|sedimentary rocks in Qaidam gate fault\|valley and geshi fault\|valley. The texture study shows that all samples were reformed by ductile deformation with undulating extinction and elongated quartzes. The metamorphic p\|T condition are estimated to be 350～500℃ and 150～450MPa They contain the syntectonic\|growing minerals such as white mica, chlorite, sericite and biotite etc. By dating these minerals, we obtain a group white mica 40 Ar/ 39 Ar isochronal age of 89 2.91 7Ma and a (46 6±6 4)Ma sericite 40 Ar/ 39 Ar apparent age. These data are very important to determine the strike\|slip age of Altyn *** 40 Ar/ 39 Ar age data (91～46Ma), we obtained, are reported for the first time in the researches of Altyn fault belt. The ages of 91～89Ma indicate that Altyn fault began to slip with slight metamorphism around late Jurassic. These ages are consistent with the ages of the collision between Kohistan\|Ladakh massif (northwestern India) and Eurasian continent at 102.*** suggests that the strike\|slip movement of Altyn fault should be related to the formation of the so\|called“Western tectonic joint" in Nepal\|western Kunlun area. The age of 46Ma should represent the overprint age of the tectono\|thermal event during main collision between Indian and Eurasian continents along the Yarlung Zangbo River. With the continent\|continent collision of Indian and Eurasian Plates, Altyn fault underwent Multi\|phase strike\|slip events in late Paleocene—Oligocene (37～35Ma), Miocene (2.～2.Ma), Miocene—Pliocene (8～6Ma), Pliocene (2.5Ma) and early

关键词： reconstruction geochronology tectonic Altyn fault

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