Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate
The precise timing, petrogenesis, and geodynamic significance of three granitoid bodies (Beidao granite, Caochuanpu granite, Yuanlongzhen granite, and the Roche type rock) of the Tianshui area in the Western Qinling Orogen, central China, are poorly constrained. We performed an integrated study of p...
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MDPI AG
2020-06-01
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| Online Access: | https://www.mdpi.com/2075-163X/10/6/515 |
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| author | Muhammad Saleem Mughal Chengjun Zhang Amjad Hussain Hafiz Ur Rehman Dingding Du Mirza Shahid Baig Muhammad Basharat Jingya Zhang Qi Zheng Syed Asim Hussain |
| author_facet | Muhammad Saleem Mughal Chengjun Zhang Amjad Hussain Hafiz Ur Rehman Dingding Du Mirza Shahid Baig Muhammad Basharat Jingya Zhang Qi Zheng Syed Asim Hussain |
| author_sort | Muhammad Saleem Mughal |
| collection | DOAJ |
| description | The precise timing, petrogenesis, and geodynamic significance of three granitoid bodies (Beidao granite, Caochuanpu granite, Yuanlongzhen granite, and the Roche type rock) of the Tianshui area in the Western Qinling Orogen, central China, are poorly constrained. We performed an integrated study of petrology, geochemistry, and zircon U-Pb dating to constrain their genesis and tectonic implication. Petrographic investigation of the granites shows that the rocks are mainly monzogranites. The Al saturation index (A/CNK versus SiO<sub>2</sub>) of the granitoid samples indicates meta-aluminous to peraluminous I-type granites. Their magmas were likely generated by the partial melting of igneous protoliths during the syn-collisional tectonic regime. Rare-earth-elements data further support their origin from a magma that was formed by the partial melting of lower continental crust. The Beidao, Caochuanpu, and Yuanlongzhen granites yielded U-Pb zircon weighted mean ages of 417 ± 5 Ma, 216 ± 3 Ma, and 219 ± 3 Ma, respectively. This study shows that the Beidao granite possibly formed in syn- to post-collision tectonic settings due to the subduction of the Proto-Tethys under the North China Block, and can be linked to the generally reported Caledonian orogeny (440–400 Ma) in the western segment of the North Qinling belt, whereas Yuanlongzhen and Caochuanpu granites can be linked to the widely known Indosinian orogeny (255–210 Ma). These granitoids formed due to the subduction of the oceanic lithospheres of the Proto-Tethyan Qinling and Paleo-Tethyan Qinling. The Roche type rock, tourmaline-rich, was possibly formed from the hydrothermal fluids as indicated by the higher concentrations of boron leftover during the late-stages of magmatic crystallization of the granites. |
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| language | English |
| last_indexed | 2024-03-10T19:26:06Z |
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| spelling | doaj.art-ad6ebfd005354051b695df15a2f586c52023-11-20T02:35:53ZengMDPI AGMinerals2075-163X2020-06-0110651510.3390/min10060515Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian PlateMuhammad Saleem Mughal0Chengjun Zhang1Amjad Hussain2Hafiz Ur Rehman3Dingding Du4Mirza Shahid Baig5Muhammad Basharat6Jingya Zhang7Qi Zheng8Syed Asim Hussain9School of Earth Sciences & Key Laboratory of Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, ChinaSchool of Earth Sciences & Key Laboratory of Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, ChinaFaculty of Earth Resources, China University of Geoscience, Wuhan 430074, ChinaGraduate School of Sciences and Engineering, Kagoshima University, Kagoshima 890-0065, JapanSchool of Earth Sciences, East China University of Technology, Nanchang 330013, ChinaInstitute of Geology, University of Azad Jammu and Kashmir, Muzaffarabad 13100, PakistanInstitute of Geology, University of Azad Jammu and Kashmir, Muzaffarabad 13100, PakistanSchool of Earth Sciences & Key Laboratory of Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, ChinaSchool of Earth Sciences & Key Laboratory of Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, ChinaQinghai Institute of Salt Lakes, Chinese Academy of Science, Xining 810008, ChinaThe precise timing, petrogenesis, and geodynamic significance of three granitoid bodies (Beidao granite, Caochuanpu granite, Yuanlongzhen granite, and the Roche type rock) of the Tianshui area in the Western Qinling Orogen, central China, are poorly constrained. We performed an integrated study of petrology, geochemistry, and zircon U-Pb dating to constrain their genesis and tectonic implication. Petrographic investigation of the granites shows that the rocks are mainly monzogranites. The Al saturation index (A/CNK versus SiO<sub>2</sub>) of the granitoid samples indicates meta-aluminous to peraluminous I-type granites. Their magmas were likely generated by the partial melting of igneous protoliths during the syn-collisional tectonic regime. Rare-earth-elements data further support their origin from a magma that was formed by the partial melting of lower continental crust. The Beidao, Caochuanpu, and Yuanlongzhen granites yielded U-Pb zircon weighted mean ages of 417 ± 5 Ma, 216 ± 3 Ma, and 219 ± 3 Ma, respectively. This study shows that the Beidao granite possibly formed in syn- to post-collision tectonic settings due to the subduction of the Proto-Tethys under the North China Block, and can be linked to the generally reported Caledonian orogeny (440–400 Ma) in the western segment of the North Qinling belt, whereas Yuanlongzhen and Caochuanpu granites can be linked to the widely known Indosinian orogeny (255–210 Ma). These granitoids formed due to the subduction of the oceanic lithospheres of the Proto-Tethyan Qinling and Paleo-Tethyan Qinling. The Roche type rock, tourmaline-rich, was possibly formed from the hydrothermal fluids as indicated by the higher concentrations of boron leftover during the late-stages of magmatic crystallization of the granites.https://www.mdpi.com/2075-163X/10/6/515Tianshui granitesmonzogranitesgeochemistryU-Pb zircon agespartial meltingsubduction of oceanic lithospheres |
| spellingShingle | Muhammad Saleem Mughal Chengjun Zhang Amjad Hussain Hafiz Ur Rehman Dingding Du Mirza Shahid Baig Muhammad Basharat Jingya Zhang Qi Zheng Syed Asim Hussain Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate Minerals Tianshui granites monzogranites geochemistry U-Pb zircon ages partial melting subduction of oceanic lithospheres |
| title | Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate |
| title_full | Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate |
| title_fullStr | Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate |
| title_full_unstemmed | Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate |
| title_short | Petrogenesis and Geochronology of Tianshui Granites from Western Qinling Orogen, Central China: Implications for Caledonian and Indosinian Orogenies on the Asian Plate |
| title_sort | petrogenesis and geochronology of tianshui granites from western qinling orogen central china implications for caledonian and indosinian orogenies on the asian plate |
| topic | Tianshui granites monzogranites geochemistry U-Pb zircon ages partial melting subduction of oceanic lithospheres |
| url | https://www.mdpi.com/2075-163X/10/6/515 |
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