Geochemistry and Geochronology of the Cenozoic Zhalaga Granitoids of the Yulong Alkali‐rich Porphyry Belt in Eastern Tibet (Xizang), SW China: Petrogenesis and Tectonic Implications

Abstract

The Jinshajiang-Ailaoshan magmatic domain is a prolific polymetallic metallogenic belt in the Sanjiang region, SE Tibet Plateau that has attracted the attention of scientists worldwide (Xia et al., 2018; Yan et al., 2018). It hosts the Yulong porphyry copper belt (Fig. 1), an important porphyry copper belt related to collision in an orogenic environment (Chung et al., 2005; Deng et al., 2014a). This NW-SE-trending copper belt is about 400 km long and 15-30 km wide, comprising a giant ore deposit (Yulong), two large ore deposits (Duoxiasongduo and Malasongduo), and two medium-sized ore deposits (Zhalaga and Mangzong) (Knudsen et al., 2001; Deng et al., 2014a, b). The Cenozoic ore-bearing porphyry deposit, exposed along the Yulong porphyry copper belt, is characterized by alkali-rich rocks (Deng et al., 2014a) that are vital for understanding the tectono-magmatic processes in the Jinshajiang-Ailaoshan region. The Zalaga porphyry body outcropping in the northern Yulong porphyry copper belt (Fig. 1), based on K-Ar dating of K-feldspar and biotite (Liu and Zhao, 1981; Tang and Luo, 1995; Zhang et al., 1997) and zircon U-Pb dating (Liang et al., 2006; He et al., 2014), is assigned ages from ca. 33.9 to 41.0 Ma, highlighting multiple magmatic events and mineralization (Zhang et al., 1998). However, the petrogenesis of the Zalaga alkali-rich porphyry and tectono-magmatic processes in the Jinshanjiang-Ailaoshan region remain controversial. The four principal models proposed on the tectonic setting and

Geochronology and Geochemistry of the Mamupu Cu‐Au Polymetallic Deposit, Eastern Tibet: Implications for Eocene Cu Metallogenesis in the Yulong Porphyry Copper Belt

“…1; Hou et al, 2003a) and the Ailao MtsHonghe River porphyry Cu-Mo ore belt (APCB) in the south (Deng et al, 2010(Deng et al, , 2011(Deng et al, , 2012Lu et al, 2013;Cao et al, 2014). Eocene intrusions in the YPCB play a vital role in mineralization, the geology and mineralization of these intrusions having been studied in detail (Hou et al, 2003a;Liang et al, 2006;Yang et al, 2014;Lin et al, 2018;Xu et al, 2020). These studies are summarized here and compared with the Mamupu deposit.…”

Early Cretaceous Granitoids Magmatism in the Nagqu Area, Northern Tibet: Constraints on the Timing of the Lhasa–Qiangtang Collision

“…As the widest distribution rocks in continental crust, granitoids have attracted considerable interest due to their indicative petrogenesis and tectonic implications, such as the reworking of continental crust and the regional tectonic evolution and geodynamics [1][2][3][4][5][6]. It is well known that granitoids expose widely in the Tibetan Plateau and were generally produced associated with the closure of Tethyan and subsequent collisional orogeny over geological periods [7][8][9][10][11].…”