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Fluid inclusion and stable isotopes study of Liancheng Cu-Mo polymetallic deposit in Lanping basin, Yunan Province TEXT SIZE: A A A

The sediments-hosted base metal deposits controlled by Cenozoic thrust-nappe structural system in Lanping basin, Southwest China, apparently differ from the sediments-hosted base metal deposits in other parts of the world. The Liancheng Cu-Mo polymetallic deposit is one of these deposits in Lanping basin. The ore-forming process can be divided into early, middle and late stages, which is characterized by quartz-molybdenites veins, quartz-sulfides veins and carbonates veins, respectively. Three types of fluid inclusions are distinguished including aqueous water (A-type) inclusions, CO2-H2O (B-type) inclusions and pure CO2 (C-type) inclusions. The homogenization temperatures of the primary A-type and B-type fluid inclusions in the early and middle-stage quartz range from 177 to 346 degrees C, with salinities ranging from 1% to 22% NaCl equivalent. Gases in fluid inclusions are CO2 and small quantities of CH4. The late-stage quartz veins contain only aqueous fluid inclusions with homogenization temperatures between 121 and 185 degrees C, and salinities ranging from 1% to 9% NaCl equivalent. The trapping pressure is up to 50 similar to 160Mpa, corresponding to the depth of 5 similar to 5. 9km. The delta(13) C values obtained from fluid inclusions in calcite and quartz range from - 3. 4 parts per thousand to - 8. 1 parts per thousand. The Liancheng deposit yield delta(18) O values of 5. 5 parts per thousand to 8. 6 parts per thousand and corresponding delta D values of - 56 parts per thousand to - 109 parts per thousand, suggesting that the mineralizing fluids originated mainly from magmatic water and accompanied participation of meteoric water. It was concluded from synthetical analyses that the buried magma hydrothermalism in the area induced by the Indo-Asian collision at about 65Ma might eventually led to the formation of the Liancheng Cu-Mo polymetallic deposit. Temperature decrease and fluid immiscibility are the important mechanism for deposition and enrichment of molybdenum and other mineralizing elements.

Publication name  ACTA PETROLOGICA SINICA Volume: 28  Issue: 5  Pages: 1373-1386  Published: MAY 2012
Author(s)  Zhang JinRang; Wen HanJie; Qin ChaoJian; Wang JiaSheng
Corresponding author  

 ZHANG Jinrang
 zhangjinrang123@163.com; wenhanjie@yip.gyig.ac.cn  
 Chinese Acad Sci, Inst Geochem, Key Lab Ore Deposit Geochem, Guiyang 550002, Peoples R China 

View here for the details from ISI Web of Knowledge

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