当前所在位置：首页 >> 科研成果 >> 论文
论文题目: Some new data on the genesis of the Linghou Cu-Pb-Zn polymetallic deposit-Based on the study of fluid inclusions and C-H-O-S-Pb isotopes
全部作者: Tang Yanwen; Li Xiaofeng; Zhang Xiaoqi; Yang Jianling; Xie Yuling; Lantingguang; Huang Youfu; Huang Cheng; Yin Rongchao
第一作者: TANG Yanwen
联系作者: TANG Yanwen
刊物名称: Ore Geology Reviews
发表年度: 2015
卷: 71
期:
页码: 248-262
摘要: The Linghou deposit, located near Hangzhou City of Zhejiang Province, eastern China, is a medium-sized polymetallic sulfide deposit associated with granitic intrusion. This deposit is structurally and lithologically controlled and commonly characterized by ore veins or irregular ore lenses. In this deposit, two mineralization events were identified, of which the former produced the Cu-Au-Ag orebodies, while the latter formed Pb-Zn-Cu orebodies. Silicification and calc-silicate (skarn type), phyllic, and carbonate alternation are four principal types of hydrothermal alteration. The early Cu-Au-Ag and late Pb-Zn-Cu mineralizations are characterized by quartz +/- sericite + pyrite + chalcopyrite + bornite +/- Au-Ag minerals +/- magnetite +/- molybdenite and calcite + dolomite + sphalerite + pyrite + chalcopyrite + galena, respectively. Calcite clusters and calcite +/- quartz vein are formed during the late hydrothermal stage. The NaCl-H2O-CO2 system fluid, coexisting with NaCl-H2O system fluid and showing the similar homogenization temperatures (385 degrees C and 356 degrees C, respectively) and different salinities (16.89-21.68 wt.% NaCl eqv. and 7.70-15.53 wt.% NaCl eqv.), suggests that fluid immiscibility occurred during the Cu-Au-Ag mineralization stage and might have given rise to the ore-metal precipitation. The ore-forming fluid of the Pb-Zn-Cu mineralization mainly belongs to the NaCl-H2O-CO2 system of high temperature (similar to 401 degrees C) and mid-high salinity (10.79 wt.% NaCl eqv.). Fluids trapped in the quartz-chalcopyrite vein, Cu-Au-Ag ores, Pb-Zn-Cu ores and calcite clusters yielded delta(OH2O)-O-18 and delta D values varying from 5.54%. to 13.11%. and from -71.8 parts per thousand to -105.1 parts per thousand, respectively, indicating that magmatic fluids may have played an important role in two mineralization events. The delta C-18(PDB) values of the calcite change from -2.78%. to -4.63%, indicating that the CO32- or CO2 in the ore-forming fluid of the Pb-Zn-Cu mineralization was mainly sourced from the magmatic system, although dissolution of minor marine carbonate may have also occurred during the ore-forming processes. The sulfide minerals have homogeneous lead isotopic compositions with Pb-206/Pb-204 ranging from 17.958 to 18.587, Pb-207/Pb-204 ranging from 15.549 to 15.701, and Pb-208/Pb-204 ranging from 37.976 to 39.052, indicating that metallic elements of the Linghou deposit came from a mixed source involving mantle and crustal components. Based on geological evidence, fluid inclusions, and H-O-C-S-Pb isotopic data, the Linghou polymetallic deposit is interpreted as a high-temperature, skarn-carbonate replacement type. Two types of mineralization are both related to the magmatic-hydrothermal system, with the Cu-Au-Ag mineralization having a close relationship with granodiorite. (C) 2015 Elsevier B.V. All rights reserved.
论文链接: http://www.sciencedirect.com/science/article/pii/S0169136815001596