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The Relationship Between The Fluid And Mineralization In The Baiyangping Polymetallic Mineralization District Of LanPing, Yunnan--A Study Of Fluid Inclusions

Posted on:2004-04-21Degree:MasterType:Thesis
Country:ChinaCandidate:Q SuFull Text:PDF
GTID:2120360092496546Subject:Mineralogy, petrology, ore deposits
Abstract/Summary:PDF Full Text Request
Lanping-Baiyangping silver polymetallic ore deposit is located in the mid Lanping Basin in the west of Yunnan Province. Studying the mineralizing fluid in this area can discuss the mineralization mechanism and offer the foundation of mineral prospecting.By testing and analyzing the fluid inclusion of ores in this area, we find that the fluid in this area mainly consists of NaCl-H2O binary system following NaCl-H2O-CaCl2 ternary system, its homogenization temperature is 90 ~ 220 , which belongs to low temperature; The salinity is on the low side (<25.3wB%NaCl), and the value of Na+ / K+ is almost bigger than 1. These suggest that the genesis of the fluid is thermal brine. The test of the hydrogen and oxygen isotopes of water in the fluid inclusion suggests the water is mainly from atmospheric sedimentation. The test of sulfur and lead isotope of ores shows that mineralizing matter mainly comes from deep. The ore minerals are typical low-to-moderate-temperature hydrothermal minerals, such as stylotypite, galenite and chalcopyrite. The gangue minerals are mostly carbonating minerals, fluorite, barite, celestite and so on; the rock alteration is slightly silicified, carbonated, baritizated, celestited, which is low-temperature alteration.Because of continual downgoing extrusion from India Plate to Euro-Asian Plate, there are some thrusting nappe structures in Lanping Basin related to the orogens on the two sides. The nappe structures made the faultage in this area developed. The faultage is along or close to meridional direction, and it offered favorable conditions for the formation of the mineralizing fluid. The mineralizing fluid in Lanping-Baiyangping area is deep circulatory thermal brine as a whole, the mineralizing matter mainly comes from deep, and the genetic type of the deposit belongs to the low-to-moderate-temperature hydrothermal silver polymetallic ore deposit related to nappe structures.
Keywords/Search Tags:fluid inclusion, mineralization, thermal brine, nappe structure, Lanping Basin
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