Petrogenesis of the Seleteguole granitoids from Jinhe county in Xinjiang (West China): Implications for the tectonic transformation of Northwest Tianshan

• Published in: Lithos 2016-07, Vol.256-257, p.148-164
• Main Authors: Zhang, Wei, Leng, Cheng-Biao, Zhang, Xing-Chun, Su, Wen-Chao, Tang, Hong-Feng, Yan, Jia-Hui, Cao, Jing-Liang
• Format: Article
• Language: English
• Subjects: Arc maturity; Hf isotopes; Northwestern Tianshan; Zircon U–Pb ages
• ISSN: 0024-4937; 1872-6143
• DOI: 10.1016/j.lithos.2016.04.002

The Seleteguole Cu–Mo deposit in Jinghe County, Xinjiang is tectonically located on the northern margin of the Northwestern Tianshan. Three major intrusions including biotite granite, diorite porphyry and quartz diorite porphyry have been identified. The biotite granite, with a zircon U–Pb age of 307±3Ma, intruded carbonates and clastic rocks of the Middle Carboniferous Dongtujin Formation. The younger diorite porphyry and quartz diorite porphyry, with an identical zircon U–Pb age of 302±3Ma, locally intruded the biotite granite; where the granite in contact with the two porphyries were characterized by phyllic alteration. The mineralogical and geochemical characteristics indicate that all granitoids in Seleteguole belong to calc-alkaline I-type. These granitoids are enriched in LILE relative to HFSE with negative anomalies of Nb, P and Ti, typical of arc-related rocks. All three granitoids have positive zircon εHf(t) values, low Mg# ratios (34–39), and low Cr (