Origin of the Tongda fluorite deposit related to the paleo-Pacific Plate subduction in southern Jiangxi Province, China: New evidence from geochronology, geochemistry, fluid inclusion, and H–O isotope compositions
This data is about the study of the fluorite deposit in Tongda, Jiangxi, which mainly includes geochronology, geochemistry, fluid inclusion, and H-O isotope compositions. This study attempts to establish clear constraints on the origin of these deposits and propose a model to better explain the ore-forming processes. The Sm–Nd dating of fluorite and zircon U–Pb ages show that Tongda deposit was formed during Late Cretaceous, and the Huitong granitic complex is the ore host rather than metallogenic body of the Tongda deposit; the study of fluid inclusions and H-O isotope compositions shows that The ore-forming fluids can be mainly attributed to a NaCl-H2O system of low temperature, salinity, and density, and the ore-forming fluid was dominated by meteoric water, possibly with minor contribution of hydrothermal fluid. Based on the results, we think that 4) Both the interaction with host rocks and the cooling of hydrothermal fluids are the likely mechanisms underlaying fluorite precipitation in the Tongda deposit, and the mineralization was occurred in extensional faults during the Late Cretaceous associated with the subduction of the Paleo-Pacific Oceanic plate.