Zircon LA‐ICP‐MS U‐Pb Dating on the Guyong Granites from the Tengchong Block, Western Yunnan and Its Geological Significance

Abstract

Magmatism and the related mineralization have been hot topic for decades. The mineral resources are very abundant in Sanjiang region, southwestern Yunnan, with several giant ore deposits of copper, stannum, gold and lead-zinc. Magmatic activation usually accompany with metallic mineralization (Deng et al., 2009(Deng et al., , 2011Wang et al., 2010). Tectonic-magmatic-metallogenic system is essential for the magmatism associated with mineralization. Guyong granite with Sn mineralization is located in a metallogenic belt, western Yunnan, and it is also a granitoid complex. We choose the intrusive rocks to reveal both the intrusive and mineralized processes based on their geochemistry and dating data.

New Constraints on the Late Oligocene‐Miocene Thermo‐Tectonic Evolution of the Southeastern Tibetan Plateau From Low‐Temperature Thermochronology

“…Generally, our zircon U‐Pb dating results are in agreement with published data and demonstrate widespread Mesozoic (crystalline) basements in the SE Tibetan Plateau (Yunnan). With regard to the Tengchong Unit, the magmatic granite (Y18) formed at 117.4 ± 2.7 Ma, which is consistent with the granite crystalline age recognized in the nearby Lianghe region (∼115.8 Ma, Xie et al., 2010), suggesting Cretaceous magmatism. Previous geological surveys attributed the well‐exposed granitoids in the westernmost Tengchong Unit to the Paleogene according to the lithologic and stratigraphic relationships (Figure 2; YBGMR, 1990, 2000a).…”

Petrogenesis and tectonic implications of the early Mesozoic granitoids in the northern Alxa region, Central Asian Orogenic Belt

“…2013; Shi et al 2014 a , b ; Xu, D. Z. et al . 2014; Yang et al 2014; Zheng et al 2014; Chen et al 2015; Xie et al 2015; Liu et al . 2017, 2018); (2) the regional unconformity and the change of sedimentary facies also suggest that a significant tectonic event happened during early–middle Permian time (Zhang, 2019); (3) the palaeomagnetic, provenance and palaeontological studies further suggest that the PAO in the northern Alxa region closed before earliest Mesozoic time (Fig.…”

The genesis of Eocene granite‐related Lailishan tin deposit in western Yunnan, China: Constraints from geochronology, geochemistry, and S–Pb–H–O isotopes

“…There are three north‐south trending granite belts in the Tengchong‐Lianghetin district (Figure 1b), namely, the Early Tertiary granite belt, the Late Cretaceous granite belt, and the Early Cretaceous granite belt (Deng, Wang, Li, Li, & Wang, 2014; Hou et al, 2007; Xie et al, 2016), which host two large tin deposits (Lailishan and Xiaolonghe, host more than 50,000t of Sn), five medium‐sized tin deposits (host 30,000–50,000 tonnes of Sn), and nearly a 100 mineralized localities. The Early Cretaceous granitic rocks are divided into three major units (Diantan, Mingguang, and Qipanshi), which display zircon U–Pb ages varying from 127 to 115 Ma (Cong et al, 2011, 2011; Luo et al, 2012; Qi, Zhu, Hu, & Li, 2011; Tao et al, 2010; Xie et al, 2010; Xu et al, 2012; Zou et al, 2011), and the Tieyaoshan tin deposit is associated with the Qipanshi granite unit (Figure 1b). The Late Cretaceous granites (Xiaolonghe and Yunfengshan) were mainly emplaced during 76–68 Ma (Figure 1b; Jiang, Gong, Zhang, & Ma, 2012; Ma et al, 2013; Xu et al, 2012).…”

“…The Xiaolonghe tin deposit is associated with the Late Cretaceous fine‐grained syenogranite in the Xiaolonghe granite unit (76 Ma;Sun et al, 2020). The Early Tertiary granites consist of the Xinqi, Lailishan, and Baihuanao granitic units, and exhibit zircon U–Pb ages ranging from 66 to 52 Ma (Booth et al, 2004; Liang et al, 2008; Chiu et al, 2009; Xie et al, 2010;Xu et al, 2012). The Lailishan tin deposit is spatially related with the Lailishan granites (Figure 1b).…”