Linking the Tengchong Terrane in SW Yunnan with the Lhasa Terrane in southern Tibet through magmatic correlation

Abstract

New zircon U-Pb data, along with the data reported in the literature, reveal five phases of magmatic activity in the Tengchong Terrane since the Early Paleozoic with spatial and temporal variations summarized as to the east, minor in the east and west, abundant Early Cretaceous (131-114 Ma) in the east, extensive Late Cretaceous (77-65 Ma) in the central region, and Paleocene-Eocene (65-49 Ma) in the central and western Tengchong Terrane, in which the Cretaceous-Eocene magmatism migrated from east to west. The increased zircon ε Hf (t) of the Early Cretaceous granitoids from -12.3 to -1.4 at ca. 131-122 Ma to -4.6 to +7.1 at ca. 122-114 Ma, identified for the first time in this study, and the magmatic flare-up at ca. 53 Ma in the central and western Tengchong Terrane indicate increased contributions from mantle-or juvenile crust-derived components. The spatial and temporal variations and changing magmatic compositions over time in the Tengchong Terrane closely resemble those of the Lhasa Terrane in southern Tibet. Such similarities, together with the data of stratigraphy and paleobiogeography, enable us to propose that the Tengchong Terrane in SW Yunnan is most likely linked with the Lhasa Terrane in southern Tibet, both of which experienced similar tectonomagmatic histories since the Early Paleozoic.

Mineralogy, zircon U–Pb–Hf isotopes, and whole‐rock geochemistry of Late Cretaceous–Eocene granites from the Tengchong terrane, western Yunnan, China: Record of the closure of the Neo‐Tethyan Ocean

“…, ; Xie et al . , ; Xu et al . , ; Zhu, Lai, Qin, & Zhao, ), (c) Late Cretaceous (80–65 Ma; Chen et al .…”

“…Due to the ongoing subduction of the multiple Tethyan oceanic plates, extensive and multi-stage magmatic activities occurred in the Tengchong terrane as follows: (a) Cambrian-Ordovician (ca. -470 Ma;Chen, Li, Wang, Li, & Siebel, 2007;Liu et al, 2009;Song et al, 2007;Zhao, Lai, Qin, & Zhu, 2016a), (b) Early Cretaceous (130-110 Ma;Cao et al, 2014;Chiu et al, 2009;Xie et al, 2016;Xu et al, 2012;Zhu, Lai, Qin, & Zhao, 2015), (c) Late Cretaceous (80-65 Chen et al, 2014;Qi et al, 2015;Wang et al, 2014b;Xu et al, 2012;Zhao et al, 2016a;Zhao, Lai, Qin, Zhu, & Wang, 2017), and (d) Early Paleocene-Eocene (65-40 Ma;Chen, Hu et al, 2015a;Lin et al, 2012;Ma et al, 2014;Qi et al, 2015;Wang et al, 2014b;Wang et al, 2015;Xu, Lan, Yang, Huang, & Qiu, 2008). Of note, granitic rocks that intruded at 125-120 and 70-50 Ma are closely related to Sn mineralization (Deng, Wang, Li & Santosh, 2014;Khin et al, 2014;Wang et al, 2014a).…”

“…An active continental margin setting related to subduction of the Neo-Tethyan Ocean has been adopted to interpret the Late Mesozoic-Cenozoic magmatic arc in the STTD, namely, the Transhimalayan magmatic belt (Wang et al, 2014a;Zhao et al, 2016a (Chen, Hu et al, 2015a;Li et al, 2017;Qi et al, 2015;Zhao et al, 2016a) and the Eocene magmatism generated I-and A-type granites with mafic-ultramafic rocks in the Tengchong terrane Richards, 2015;Wang et al, 2014c;Xie et al, 2016;Xu et al, 2012;Zhao, Lai, Qin, & Zhu, 2016b).…”

“…, ; Lin, Peng, Qiao, & Li, ; Liu et al, ; Ma et al . , , ; Qi et al, ; Tan, Zhao, Li, Xu, & Zhang, ; Wang et al, , Wang et al, 2014b; Wang et al, ; Xie et al, , ; Xu et al, , ; Yang, Xu, Huang, Luo, & Shi, ; Zhao et al, , , ; Zhou, Qi, Hu, Bi, & Meng, ; Zhu, Wang et al, ; Zou, Mao, Zou, Lin et al, , Zou, Mao, Zou, Mao et al, [Colour figure can be viewed at wileyonlinelibrary.com]…”

Petrogenesis and tectonic setting of the Early Cretaceous granitoids in the eastern Tengchong terrane, SW China: Constraint on the evolution of Meso-Tethys

“…Accordingly, the Early Cretaceous granitoids widespread in the Tengchong terrane, SW China, are prime records for understanding their tectonic environments and Sn mineralization related to synchronous magmatism (Cong et al, 2011a(Cong et al, , 2011bQi et al, 2011;Luo et al, 2012;Xu et al, 2012;Cao et al, 2014;Zhu et al, 2015;Xie et al, 2016;Fang et al, 2018;Qi et al, 2019). On the basis of close similarity in geochemical characteristics and chronology of these igneous rocks, geologists proposed that the Tengchong terrane is most likely linked with the Lhasa terrane and experienced similar tectonic histories since the Early Paleozoic (Xu et al, 2008(Xu et al, , 2012Xie et al, 2016;Qi et al, 2019). Compared with the magmatism in the Lhasa terrane, the Early Cretaceous magmatism in the Tengchong terrane is considered as the eastern extension of the Gangdese batholith which is located in the southern Lhasa terrane (Xie et al, 2016;Qi et al, 2019).…”