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A Late Cretaceous felsic magmatic suite from the Tengchong Block, western Yunnan: integrated geochemical and isotopic investigation and implications for Sn mineralization

  • Zhuanrong Sun (a1), Guochen Dong (a1), M Santosh (a1) (a2), Xuanxue Mo (a1), Pengsheng Dong (a1), Weiqing Wang (a1) and Bin Fu (a3)...

Abstract

The Tengchong Block within the Sanjiang Tethys belt in the southeastern part of the Tibetan plateau experienced a widespread intrusion of a felsic magmatic suite of granites in its central domain during Late Cretaceous times. Here, we investigate the Guyong and Xiaolonghe plutons from this suite in terms of their petrological, geochemical, and Sr–Nd, zircon U–Pb and Lu–Hf–O isotopic features to gain insights into the evolution of the Neo-Tethys. The Guyong pluton (76 Ma) is composed of metaluminous monzogranites, and the Xiaolonghe pluton (76 Ma) is composed of metaluminous to peraluminous medium- and fine-grained syenogranite. A systematic decrease in Eu, Ba, Sr, P and Ti concentrations; a decrease in Zr/Hf and LREE/HREE ratios; and an increase in the Rb/Ba and Ta/Nb ratios from the Guyong to Xiaolonghe plutons suggest fractional crystallization of biotite, plagioclase, K-feldspar, apatite, ilmenite and titanite. They also show the characteristics of I-type granites. The negative zircon εHf(t) isotopic values (−10.04 to −5.22) and high δ18O values (6.69 to 8.58 ‰) and the negative whole-rock εNd(t) isotopic values (−9.7 to −10.1) and high initial 87Sr/86Sr ratios (0.7098–0.7099) of the Guyong monzogranite suggest that these rocks were generated by partial melting of the Precambrian basement without mantle input. The zircon εHf(t) isotopic values (−10.63 to −3.04) and δ18O values (6.54 to 8.69 ‰) of the Xiaolonghe syenogranite are similar to the features of the Guyong monzogranite, and this similarity suggests a cogenetic nature and magma derivation from the lower crust that is composed of both metasedimentary and meta-igneous rocks. The Xiaolonghe fine-grained syenogranite shows an obvious rare earth element tetrad effect and lower Nb/Ta ratios, which indicate its productive nature with respect to ore formation. In fact, we discuss that the Sn mineralization in the region was possible due to Sn being scavenged from these rocks by exsolved hydrothermal fluids. We correlate the Late Cretaceous magmatism in the central Tengchong Block with the northward subduction of the Neo-Tethys beneath the Burma–Tengchong Block.

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Corresponding author

Author for correspondence: Guochen Dong, Email: donggc@cugb.edu.cn

References

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Zhao, SW, Lai, SC, Qin, JF, Zhu, RZ and Gan, BP (2017a) The petrogenesis and implications of the Early Eocene granites in Lianghe area, Tengchong Block. Acta Petrologica Sinica 33, 191203 (in Chinese with English abstract).
Zhao, SW, Lai, SC, Qin, JF, Zhu, RZ and Wang, JB (2017b) Geochemical and geochronological characteristics of Late Cretaceous to Early Paleocene granitoids in the Tengchong Block, Southwestern China: implications for crustal anatexis and thickness variations along the eastern Neo-Tethys subduction zone. Tectonophysics 694, 87100.
Zhu, RZ (2017) Petrogenesis and geodynamic implications of Early Cretaceous granitic rocks in the Tengchong Block, SW China. Ph.D. thesis, Northwest University, Xi’an, China, 259 pp. (in Chinese with English abstract). Published thesis.
Zhu, RZ, Lai, SC, Qin, JF and Zhao, SW (2015) Early-Cretaceous highly fractionated I-type granites from the northern Tengchong block, western Yunnan, SW China: petrogenesis and tectonic implications. Journal of Asian Earth Sciences 100, 145–63.
Zhu, RZ, Lai, SC, Qin, JF and Zhao, SW (2018a) Early-Cretaceous syenites and granites in the northeastern Tengchong block, SW China: petrogenesis and tectonic implications. Acta Geologica Sinica (English Edition) 92, 1349–65.
Zhu, RZ, Lai, SC, Qin, JF and Zhao, SW (2018b) Petrogenesis of late Paleozoic-to-early Mesozoic granitoids and metagabbroic rocks of the Tengchong Block, SW China: implications for the evolution of the eastern Paleo-Tethys. International Journal of Earth Sciences 107, 431–57.
Zhu, RZ, Lai, SC, Qin, JF, Zhao, SW and Santosh, M (2018c) Strongly peraluminous fractionated S-type granites in the Baoshan Block, SW China: implications for two-stage melting of fertile continental materials following the closure of Bangong-Nujiang Tethys. Lithos 316–317, 178–98.
Zhu, RZ, Lai, SC, Qin, JF, Zhao, SW and Wang, JB (2017a) Late Early-Cretaceous quartz diorite–granodiorite–monzogranite association from the Gaoligong belt, southeastern Tibet Plateau: chemical variations and geodynamic implications. Lithos 288–289, 311–25.
Zhu, RZ, Lai, SC, Santosh, M, Qin, JF and Zhao, SW (2017b) Early Cretaceous Na-rich granitoids and their enclaves in the Tengchong Block, SW China: magmatism in relation to subduction of the Bangong–Nujiang Tethys ocean. Lithos 286–287, 175–90.

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A Late Cretaceous felsic magmatic suite from the Tengchong Block, western Yunnan: integrated geochemical and isotopic investigation and implications for Sn mineralization

  • Zhuanrong Sun (a1), Guochen Dong (a1), M Santosh (a1) (a2), Xuanxue Mo (a1), Pengsheng Dong (a1), Weiqing Wang (a1) and Bin Fu (a3)...

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