Abstract
The Lyangar W-Mo skarn deposit is located in the Nuratau area (western Uzbekistan), South Tianshan Orogen. The skarn system is distributed along the contact zone between the Aktau granitoid and the upper Paleozoic sedimentary rocks. Six molybdenite samples from the Lyangar deposit yielded a Middle Permian Re-Os isochron age of 268.0 ± 12 Ma (MSWD = 0.43) and a weighted mean age of 263.8 ± 1.5 Ma (MSWD = 0.22). Molybdenites have low Re contents (12.49 to 16.65 ppm), indicative of a continental crust-dominated source. The molybdenite δ34S values fall inside a narrow range (1.0 to 3.8‰; average 2.3‰), implying that the ore metals were likely derived from the granite intrusion. We concluded that the Lyangar W-Mo deposit was formed in a post-collisional setting caused by continental collision between the Tarim and Kazakhstan cratons.
Highlights
Tungsten (W) skarn deposits host the world’s principal W resource, many with high grades and large tonnages [1]
Many mineral occurrences were discovered in the South Tianshan Orogen (e.g., Au, W, Hg, Sb, Pb, and Zn), including some world-class orogenic-type gold deposits (e.g., Muruntau, Amantaitau, Daugyztau, and Zarmitan; [18,19,20,21]), large Al deposits (Boruhskoe and Hodgaachkan), together with large W-Sn (Trudovoe) and W (Meliksu and Kumysh-Tash) deposits [22,23]
This paper reports new molybdenite Re-Os and S isotopic data of the Lyangar W-Mo deposit, and thereby discusses the source of ore-forming fluids, and constrains the age of mineralization and tectonic setting of the deposit
Summary
Tungsten (W) skarn deposits host the world’s principal W resource, many with high grades and large tonnages [1]. The largest W mineral provinces in the world include South China, Central. Located in the southern part of the Central Asia Orogenic Belt (CAOB; [4]), the South Tianshan Orogen experienced a long-lived arc-basin evolution, and took shape through late Paleozoic collision between the Tarim and Kazakhstan-Yili blocks [5]. Many mineral occurrences were discovered in the South Tianshan Orogen (e.g., Au, W, Hg, Sb, Pb, and Zn), including some world-class orogenic-type gold deposits (e.g., Muruntau, Amantaitau, Daugyztau, and Zarmitan; [18,19,20,21]), large Al deposits (Boruhskoe and Hodgaachkan), together with large W-Sn (Trudovoe) and W (Meliksu and Kumysh-Tash) deposits [22,23]. In the Uzbekistan South Tianshan Orogen, four W-(Mo) deposits have been discovered, i.e., Ingichko, Lyangar, Yahton, and Sautbay, but their ages and tectono-metallogenic setting are still unclear [24]
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