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Fabrics and Ar-40/Ar-39 ages of metamorphic rocks in the Gaoligong tectonic belt: Implications for Cenozoic metamorphism and deformation in the SE Tibetan Plateau
Tang, Yuan1,2; Wang, Dongbing1; Liao, Shiyong3; Wang, Baodi1; Yin, Fuguang1
2020-05-01
Source PublicationJOURNAL OF ASIAN EARTH SCIENCES
ISSN1367-9120
Volume192Pages:17
Corresponding AuthorTang, Yuan(tyvienna@qq.com)
AbstractAs one of the major tectonic belts in the southeastern Tibetan plateau, the Gaoligong tectonic belt plays important roles in accommodating the Indian-Eurasian plate collision. In this belt, medium-high-grade metamorphic rocks are preserved. In this study, we selected three cross-sections from the northern to the southern segment of the Gaoligong tectonic belt for detailed structural (macro- and micro-) observations and quartz fabric analysis. Quartz c-axis fabrics reflect three ranges of metamorphic temperature in the metamorphic rocks: Range 1 ( > 650-700 degrees C, corresponding to granulite facies), Range 2 (550-650 degrees C, amphibolite facies), and Range 3 (400-500 degrees C, greenschist facies). Mineral separates (amphibole, muscovite, and biotite) from five samples taken from the Lushui-Pianma section were selected for Ar-40/Ar-39 study, yielding plateau ages of similar to 30 Ma (amphibole), -17 Ma (biotite), and similar to 15 Ma (muscovite), respectively. Combined with the previous geochronological data, it is suggested that there are three stages of metamorphism-deformation of the Gaoligong tectonic belt during Cenozoic. The early stage of metamorphism occurred at high temperature conditions ( > 650-700 degrees C, corresponding to granulite facies) during 50-34 Ma, coeval with the Cenozoic collision of the Indian Plate and Tengchong Block. The subsequent stage of metamorphism occurred at medium to low temperatures (550-650 degrees C, 400-500 degrees C, respectively) during 34-10 Ma and is the result of a non-coaxial progressive deformation showing dextral shear along the Gaoligong strike-slip fault. The latest stage represents rapid exhumation and cooling during 10-3 Ma.
KeywordThe Gaoligong tectonic belt Metamorphism and deformation Microstructural analysis Fabric analysis Ar-40/Ar-39 dating
DOI10.1016/j.jseaes.2020.104270
WOS KeywordRIVER SHEAR ZONE ; APATITE FISSION-TRACK ; WESTERN YUNNAN PROVINCE ; HF ISOTOPIC COMPOSITION ; AILAO SHAN ; INDO-CHINA ; DIANCANG SHAN ; STRIKE-SLIP ; FAULT ZONE ; NORTHWESTERN YUNNAN
Indexed BySCI
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000521111600023
PublisherPERGAMON-ELSEVIER SCIENCE LTD
Citation statistics
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/35866
Collection中国科学院紫金山天文台
Corresponding AuthorTang, Yuan
Affiliation1.China Geol Survey, Chengdu Ctr, Chengdu 610081, Peoples R China
2.Chinese Acad Geol Sci, Inst Geol, Beijing 100037, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
Recommended Citation
GB/T 7714
Tang, Yuan,Wang, Dongbing,Liao, Shiyong,et al. Fabrics and Ar-40/Ar-39 ages of metamorphic rocks in the Gaoligong tectonic belt: Implications for Cenozoic metamorphism and deformation in the SE Tibetan Plateau[J]. JOURNAL OF ASIAN EARTH SCIENCES,2020,192:17.
APA Tang, Yuan,Wang, Dongbing,Liao, Shiyong,Wang, Baodi,&Yin, Fuguang.(2020).Fabrics and Ar-40/Ar-39 ages of metamorphic rocks in the Gaoligong tectonic belt: Implications for Cenozoic metamorphism and deformation in the SE Tibetan Plateau.JOURNAL OF ASIAN EARTH SCIENCES,192,17.
MLA Tang, Yuan,et al."Fabrics and Ar-40/Ar-39 ages of metamorphic rocks in the Gaoligong tectonic belt: Implications for Cenozoic metamorphism and deformation in the SE Tibetan Plateau".JOURNAL OF ASIAN EARTH SCIENCES 192(2020):17.
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