地质科技通报 (Jan 2023)
Middle-Late Triassic regional-scale magmatic-hydrothermal metallogenic system in the eastern segment of the East Kunlun
Abstract
A large-scale mineralization occurred in the East Kunlun during the Early Mesozoic, forming a series of lode gold, quartz vein-type Ag-Pb-Zn, porphyry Cu-Mo, and skarn Fe polymetallic deposits. However, the genetic link between these deposits is still unclear. The eastern segment of the East Kunlun has diverse types of deposits which provides an excellent opportunity to decipher the genetic link. Here we summarize the geological features and spatial-temporal distribution of the major types of deposits in the eastern segment of the East Kunlun, and discuss their metallogenic ages, tectonic settings, and sources of ore-forming fluids and materials to explore possible genetic links between them. The results show that they were mainly formed in the Middle-Late Triassic (240-220 Ma), controlled by the Paleo-Tethys continental collision and post-collision extension. Additionally, these different types of deposits in the study area and the surrounding Northern East Kunlun Terrane have similar metal and fluid sources. They are closely related to the extensive deep magmatism developed during this period. We suggest that these deposits formed a giant magmatic-hydrothermal metallogenic system, and different mineralization types might be the products of different evolution stage. The deep subduction and break-off of the Bayankura Plate induced the upwelling of the asthenospheric mantle and the subsequent large-scale magmatic-fluid activities. The metal- and volatile-rich hydrothermal fluids extensively interacted with upper crustal rocks and shallow-derived fluids, and formed a regional-scale magmatic-hydrothermal metallogenic system. Based on the metallogenic system, the eastern segment of the East Kunlun has potential for multi-type paragenetic deposit exploration.
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