【摘 要】
：
The Huayangchuan ore belt is located in the western segment of Xiaoqinling Orogen in the southern margin of the North China Craton (NCC), and hosts voluminous magmatism and signifi- cant U-REE-Mo-Cu-Fe polymetallic mineralization. However, geochronologica
【机 构】
：
Key Laboratory of Mineralogy and Metallogeny,Guangzhou Institute of Geochemistry,Chinese Academy of
论文部分内容阅读
The Huayangchuan ore belt is located in the western segment of Xiaoqinling Orogen in the southern margin of the North China Craton (NCC), and hosts voluminous magmatism and signifi- cant U-REE-Mo-Cu-Fe polymetallic mineralization. However, geochronological framework of the vari- ous mineralization phases in this region is poorly understood. Here, we present new Re-Os isochron ag- es on magnetite from the Caotan Fe deposit (2675 ± 410 Ma, MSWD=0.55), and on pyrite from the Jialu REE deposit (2127 ± 280 Ma, MSWD=1.9) and Yuejiawa Cu deposit (418 ± 23 Ma, MSWD= 11.5), and Re-Os weighted average model age on pyrite from the Taoyuan Mo-U deposit (235 ± 14 Ma, MSWD=0.17). These ages, combined with regional geology and mineralization ages from other depos- its, suggest that mineralization in the Huayangchuan ore belt lasted from the Neoarchean to the Late Mesozoic. The mineralization corresponds to regional tectono-magmatic events, including the Neoar- chean alkali magmatism (REE mineralization), Paleoproterozoic plagioclase-amphibolite emplacement (Fe mineralization), Paleoproterozoic pegmatite magmatism (U mineralization), Paleozoic Shangdan oceanic slab subduction-related arc magmatism (Cu mineralization), Early Mesozoic Paleo-Tethys Ocean subduction-related arc magmatism (Mo-U mineralization), and Late Mesozoic Paleo-Pacific oce- anic plate subduction direction change-related Mo(-Pb) mineralization. We proposed that the Huayang- chuan ore belt has undergone prolonged metallogenic evolution, and the magmatism and associated mineralization were controlled by regional geodynamic events.
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