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《GEOCHIMICA》 1999-05
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Characteristics of ore forming fluid in Linglong Gold Mine, Shandong, China

Lu Huan Zhang①② J Guha① Fang Gengbao②(①Sciences de la terre, Université du Québec  Chicoutimi, Chicoutimi, Québec, Canada, G7H)(②Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550002)  
The Linglong area, located in Shandong Province, is one of the largest gold mining camps in China The Linglong granites, hosting about one hundred gold mines and showings are located in the Eastern Shandong Precambrian Shield The area is composed of Archean granulites and plagioclase horblendites forming a complex east west trending anticlinorium The Linglong intrusive is gneissic biotite granite The northeast trending, southeast dipping Puotouqing ductile shear zone occurs in the SE margin of Linglong granite Faults are several kilometers long and 300~800 m wide These faults are related to shear zone and controlled mineralization emplacement The deposit is divided into east and west zone, with a great difference in characteristics The east deposit consists of fault controlled stockwork type veins (or altered type), whereas the west deposit is mainly composed of large veins enclosed within shear zone and faults Four mineralization stages have been recognized: (1)milky quartz pyrite, (2) gold quartz pyrite, (3) gold polymetallic sulfides quartz and (4) carbonate stage The ore minerals are native gold and electrum associated with pyrite and chalcopyrite Associated alteration are mainly silicification, K feldspathization, sericitisation and chloritization These alternations are superimposed on the mineral assemblage of the granitic rocks A combination of H2O rich (with 3%~17% equivalent NaCl), CO2 rich, CO2 H2O, CO2 CH4 and daughter mineral bearing inclusions present in the four stages of vein formation indicates an evolutionary trend for the ore mineralizing fluid Two dominant phases are apparent, a NaCl H2O system and a CO2 H2O CH4 system, with a homogenization temperature ranging from 200 ℃ to 380 ℃ This may best be explained as unmixing of the two systems from a single phase However, a few oxygen and hydrogen isotope analyses of fluids from stage I, II, and Ⅲ of veins indicate a meteoric water (+2‰) mixing, driving the composition towards negative oxygen values (-2‰) The occurrence of a CO2 dominated system could be interpreted as having stemmed from a deeper fluid of magmatic or metamorphic origin
【Fund】: 国家自然科学基金!( 编号: 49373172)
【CateGory Index】: P618.51
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