Petrogenesis of Permian A-type granitoids in the Cihai iron ore district, Eastern Tianshan, NW China: Constraints on the timing of iron mineralization and implications for a non-plume tectonic setting
作者： Jiahao Zheng , Jingwen Mao , Fengmei Chai , Fuquan Yang
DOI: 10.1016/J.LITHOS.2016.05.012
关键词: Permian 、 Geology 、 Geochemistry 、 Mineralization (geology) 、 Geochronology 、 Petrology 、 Zircon 、 Crust 、 Quartz monzonite 、 Mantle plume 、 Petrogenesis
摘要: Abstract The geochronology and geochemistry of granitoids in the Eastern Tianshan, NW China provide important constraints on timing iron mineralization, as well understanding evolution history southern Central Asian Orogenic Belt (CAOB). Here we present results from a detailed study granitoid rocks Cihai ore district Beishan region, part Tianshan. are composed granodiorite, quartz monzonite, granite, monzonite. Zircon U–Pb analyses yielded ages 294.1 ± 2.2 Ma, 286.5 ± 0.7 Ma, 284.3 ± 3.3 Ma, 265.6 ± 3.0 Ma, respectively, suggesting they were formed Early–Middle Permian. Among these rocks, monzonite granite close to mineralization (~ 282 Ma), indicating may source district. Geochemically, samples characterized by high FeO t /(FeO + MgO) Ga/Al ratios (0.84–0.94 2.28–3.27, respectively), zircon saturation temperatures (781–908 °C), similar those typical A-type granitoids. Isotopically, display consistently depleted Hf isotopic compositions (e (t) = + 1.18 + 15.37). Geological, geochemical, data suggest that derived melting juvenile lower crust. Some Early Permian recently identified Tarim Tianshan with between 294 269 Ma. earlier 294–284 Ma exhibit characteristics A 2 type granitoids, whereas later 277–269 Ma show 1 affinity. We mantle plume does not account for formation area, was non-plume tectonic setting during time. slab break-off event has been suggested possible mechanism triggered
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