Vein-type fluorite mineralization of the Linxi district in the Great Xing'an Range, Northeast China: Insights from geochronology, mineral geochemistry, fluid inclusion and stable isotope systematics

• DOI: 10.1016/j.oregeorev.2022.104708
• Publication Date: 2022-01-18T01:22:55Z
• Authors: Qiu-Ming Pei; Cheng-Hong Li; Shou-Ting Zhang; Hao Zou; Yi Liang; Liang Wang; Shu-Le Li; Hua-Wen Cao
• Keywords: Fluorite; Geochronology; Isotope Geochemistry

The Linxi fluorite district is located in the southern Great Xing'an Range and tectonically belongs to eastern segment of Central Asian Orogenic Belt. Previous studies mainly focus on metal deposits this region, but relatively little attention has been paid mineralization. contains more than 60 while formation age, nature mineralized fluids, ore-forming processes are poorly understood. This study focuses geology, geochronology geochemistry which share similar relatable geological features. Fluorite veins strictly controlled by ∼S-N-, NNE-SSW- NE-SW-striking fault zones. Ore mineral assemblages quite simple include fluorite, quartz calcite. Geochronological data indicate that main-stage vein mineralization occurred approximately at 137–132 Ma. Fluid inclusions hosted calcite homogenize 140–220 °C, corresponding low salinities (mainly 0.3–1.2 wt% NaCl equivalent). Ore-forming fluids characterized temperatures, densities H2O–NaCl system. carbon, hydrogen oxygen isotopic compositions samples obtained from an origin meteoric water. Combined with trace element geochemistry, area a common hydrothermal origin. large-scale region may link Late Mesozoic metallogenic events associated extensional tectonic setting.