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Permian-Triassic Magmatism in the Qin-Fang Tectonic Belt, SW China: New Insights into Tectonic Evolution of the Eastern Paleo-Tethys.
- Source :
-
Journal of Earth Science . Dec2023, Vol. 34 Issue 6, p1704-1716. 13p. - Publication Year :
- 2023
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Abstract
- The granites of ambiguous geodynamic mechanism in the Qin-Fang tectonic belt (SW China) were studied in detail based on petrological, element geochemical, zircon U-Pb geochronological, and Hf isotopic data. LA-ICPMS U-Pb analyses on zircon yield ages of 248–245 Ma for the granites from the Qin-Fang tectonic belt. The geochemical data show that they are high-K, calc-alkaline, and peraluminous series. Their εHf(t) values are from −14.01 to −7.75 with two-stage model ages of 1.74–1.43 Ga. These data, integrated with low Al2O3/TiO2, Rb/Sr, Rb/Ba, and (Na2O + K2O)/(FeOT + MgO + TiO2) ratios, and high CaO/Na2O ratios for the granite, suggest an origin from psammite source which was contaminated by mantle-derived components. These observations, in combination with the age data and stratigraphic records in the Jinshajiang, Ailaoshan, and Hainan Island areas suggest that the granites were formed in a post-collision tectonic setting. The Qin-Fang tectonic belt was likely a branched ocean basin of the eastern Paleo-Tethys. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 1674487X
- Volume :
- 34
- Issue :
- 6
- Database :
- Academic Search Index
- Journal :
- Journal of Earth Science
- Publication Type :
- Academic Journal
- Accession number :
- 174207367
- Full Text :
- https://doi.org/10.1007/s12583-020-1111-6