2021 Vol. 40, No. 5
Article Contents

XIE Xiaofeng, YANG Kunguang. Rb-Sr Isotope ages and fluid inclusion characteristics of Pb-Zn deposit and their prospecting significance in Panshi-Panxin region, eastern Guizhou Province[J]. Geological Bulletin of China, 2021, 40(5): 772-781.
Citation: XIE Xiaofeng, YANG Kunguang. Rb-Sr Isotope ages and fluid inclusion characteristics of Pb-Zn deposit and their prospecting significance in Panshi-Panxin region, eastern Guizhou Province[J]. Geological Bulletin of China, 2021, 40(5): 772-781.

Rb-Sr Isotope ages and fluid inclusion characteristics of Pb-Zn deposit and their prospecting significance in Panshi-Panxin region, eastern Guizhou Province

  • The Pb-Zn deposit in Panshi-Panxin area, located on the Western margin of Xuefeng Mountain and the junction of Yangtze block and Jiangnan orogenic belt, is relatively a typical one in Songtao area, East Guizhou.The Rb-Sr isochronal dating on sphalerite of main metallogenic period yields an age of 486±3 Ma(MSWD=1.2) and (87Sr/86Sr)i=0.70918±0.00002.The results of petrography, microthermometer and composition analysis on fluid inclusion in calcite show that the liquid-rich liquid-vapor-type fluid inclusions are the primary ones with a homogenization temperature of 277.23℃, and vapor phases are dominated by CO2 and H2O, with minor CH4 present in individual fluid inclusion, and the ionic compositions are dominated by Na+, Ca2+, Mg2+, Cl- and minor K+and SO42-.The comprehensive studies show that the Pb-Zn deposit of this area was formed in the Late Cambrian to Early Ordovician, later than the country rock of Cambrian Second Series Qingxudong Formation, and indicate a genesis of epigenetic deposit.The(87Sr/86Sr)i of sphalerite is higher than the wall rock, similar to the 87Sr/86Sr ratio of Early Cambrian seawater.Based on the analysis of the ore-bearing potential of the regional strata, it is speculated that the metallogenic material is derived from the Cambrian Niutitang Formation black shale series.The ore-forming fluid is of medium and low temperature hot brine origin and may be mixed with other hydrothermal sources.It is more likely that Pb and Zn migrated in the ore-forming fluid in the form of chloride.

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