南京大学学报（自然科学版）2018，Vol.54Issue(2)：322-335,14.DOI:10.13232/j.cnki.jnju.2018.02.008
江西省德兴市渔塘金矿的流体包裹体研究
The fluid inclusion study on the Yutang gold deposit in Dexing, Jiangxi province
摘要
Abstract
The Yutang gold deposit is located in the Neoproterozoic Jiangnan orogenic belt between the Yangtze and Cathaysia blocks,which belongs to the large copper-gold ore deposit cluster in Dexing area.These fluid inclusions can be divided into three categories:H2O-CO2 inclusions(type Ⅰ),CO2-enriched inclusions(type Ⅱ),and aqueous solution inclusions(type Ⅲ).Before the mineralization,the pre-ore stage of barren quartz veins mainly contain typeⅠ inclusions,and the proportion of CO2bubble ratio is relatively constant,with homogenization temperatures(Th)of 345 ℃~383 ℃ and salinities of 2.0 wt.%~6.5 wt.% NaCl equivalent;There are three types of inclusions in the ore stage of quartz veins with variable gas ratios and CO2contents,type Ⅱ inclusions show homogenization temperatures (Th)of 275 ℃~314 ℃ and a salinity of 1.8 wt.%~4.8 wt.% NaCl equivalent,type Ⅲ inclusions show homogeniza-tion temperatures(Th)of 278 ℃~354 ℃ and a salinity of 4.2 wt.%~9.6 wt.% NaCl equivalent,the type Ⅱ and type Ⅲ inclusions show similar homogenization temperatures,but different from the salinities,while type Ⅰ inclu-sions display homogeneous temperatures(Th)of 290 ℃~363 ℃ and a salinity of 1.0 wt.%~5.5 wt.% NaCl equivalent.In the post-mineralization stage,quartz-pyrite veins contain only type Ⅲ inclusions with lower tempera-tures and a lower salinity.The results of petrological observation and microscopic temperature measurement show that the fluid immiscibility mainly occurrs in the ore-forming stage of gold,resulting in uniform temperatures and different salinities,and gold is mainly enriched at this stage.The Yutang gold deposit shows similar metallogenic characteristics with the Jinshan gold deposit,as the ore-forming fluid has typical characteristics of fluid immiscibility. The Yutang gold deposit is a typical orogenic gold deposit.关键词
流体包裹体/流体不混溶/造山型金矿/渔塘金矿Key words
fluid inclusions/fluid immiscibility/orogenic gold deposit/Yutang gold deposit分类
天文与地球科学引用本文复制引用
赵丹蕾,倪培,朱安冬,王国光,丁俊英..江西省德兴市渔塘金矿的流体包裹体研究[J].南京大学学报（自然科学版）,2018,54(2):322-335,14.基金项目
科技部国家重点研发计划(2016YFC0600206),国家自然科学基金(41772063) （2016YFC0600206）
