Evolution of pegmatite ore-forming fluid: The Lijiagou spodumene pegmatites in the Songpan-Garze Fold Belt, southwestern Sichuan province, China

Forecasting Rare Metal Pegmatite Deposits of the Kalba Region

“…Known rare metal and rare earth deposits (Nb, Ta, Be, TR, Li, etc.) were formed in a postcollisional (orogenic) geodynamic setting, accompanied by a powerful development of Permian granitoid magmatism, typical for many regions of the Central Asian belt (Buslov, 2011;Safonova, 2014;Fei et. al., 2021;Kotler et.…”

Whole-Rock Geochemistry and Mica Compositions in Lijiagou Pegmatite Spodumene Deposit, Western Sichuan, China

“…In the magmatic-hydrothermal transition stage, the fluid properties of the system are volatile-rich silicate fluids. With the decrease in temperature and pressure, the phenomenon of symbiosis between low-salinity, high-density crystal-rich inclusions and high-salinity, low-density CO 2 -H 2 O inclusions appears, indicating that fluid immiscibility occurs in the system, which is also a critical mechanism of Li enrichment and precipitation in the Lijiagou deposit [19,29]. ASP underwent a magmatic-hydrothermal transformation and post-crystallization hydrothermal process during its formation and evolution, and the high enrichment of Li also occurred in the magmatic-hydrothermal transition stage [30].…”

“…Granite pegmatite rare-metal deposits are the product of the magmatic-hydrothermal stage, ore-forming fluids mainly originate from highly differentiated granitic magmas, and the differentiation evolution process plays an important role in controlling diagenesis and mineralization [7]. Although pegmatite melt is mostly considered to be the residual melt produced by magma separation and the crystallization of mother granite [7,[15][16][17], experimental studies have shown that fluid immiscibility is also a critical mechanism of rare-metal enrichment during magmatic evolution [18][19][20].…”

“…The deposit is the third largest spodumene pegmatite deposit in Asia, after the Dangba (Li resources of 0.66 Mt) and Jiajika (Li resources of 0.92 Mt) deposits [27]. Previous studies of the Lijiagou pegmatite spodumene deposit have mainly focused on geological characteristics [28], the origin and characteristics of the fluid [19,27,29,30], the geochronology of pegmatite [31,32], the origin of pegmatite magmas, and their relationship with the Ke'eryin pluton granites [19]. In this paper, we selected representative samples of the Ke'eryin pluton and pegmatites from the Lijiagou deposit for a geochemical analysis of whole rock and mica and used these data to analyze the metallogenic tectonic environment characteristics and magmatic-hydrothermal evolution processes of pegmatites.…”

Geochronology and Geochemistry of Granitic Pegmatites from Tashidaban Li Deposit in the Central Altun Tagh, Northwest China

“…Several large-scale rare-metal mineralization belts have been discovered in China with distributions in the West Kunlun-Songpan-Ganzi orogenic belt, Tianshan orogenic belt, Altai orogenic belt, Qinling-Dabie orogenic belt, Himalaya orogenic belt, Sanjiang orogenic belt, Wuyi-Yunkai orogenic belt, and Jiangnan orogenic belt in recent years [8,9]. Extensive work has been carried out by previous researchers on the formation age of pegmatites [10][11][12][13][14][15][16][17], petrogenesis [18][19][20][21], mineralogical characteristics [22][23][24][25], magma evolution [26][27][28][29][30][31], ore-forming fluids [32][33][34], and genesis mechanisms of granitic pegmatites [35][36][37][38][39][40], which significantly enhanced the understanding of rare-metal pegmatites in China.…”