地质科学2017，Vol.52Issue(4)：1282-1296,15.DOI:10.12017/dzkx.2017.079
赣中大王山钨多金属矿床流体包裹体及H-O-S同位素特征
Immiscibility and mineralization of Dawangshan tungsten polymetallic deposit, central Jiangxi Province
摘要
Abstract
The fluid inclusions and H-O-S isotopes of ore-stage quartz and sulfide are studied in order to determine the genetic type and geological characteristics of tungsten polymetallic deposit of Dawangshan in the central Jiangxi Province.Combined with field orebody shape,the study area can be divided into three stages of mineralization,there were some ore pockets in early mineralization stage,no obvious alteration phenomenon with the surrounding rock,the mainmineralization stage is the large veins,the surrounding rock occurred greisenization,in the late stage,there were ore minerals in quartz geodes.The results of fluid inclusion petrography and microthermometry showed that the quartz mainly contain gas-liquid inclusions,vapor-rich inclusions,CO2 three phase inclusion and gas-liquid-solid three-phase inclusion;The homogenization temperature of fluid inclusions is 180 ℃ ～280 ℃ (peak is 190 ℃ ～ 210 ℃),salinity is 7.86％ ～ 20.22％ NaCleqv (peak is 11％ ～ 17％ NaCleqv),belonging to the moderate temperature,and moderate-high salinity deposit;The δDγ-SMOW values of quartz inclusions is-93.1‰ ～-72.5‰,the δ18OH2O values is 0.9‰ ～ 3.4‰,as can be seen from the temperature salinity graph of quartz inclusions,ore-forming fluid was mixed with fluid phase of low temperature and low salinity;The δ34S values of sulfide range from-1.3‰ to + 1.9‰,shows that sulfur mainly derived from deep magma sources.Combined with previous researches,the crystallization time of wolframite is earlier than quartz's,and the ore-forming fluids is magmatic water,but mixed with meteoric water.The W-Mo polymetallic ore capsule,aplite veins and pegmatite veins were found in the ore-hosting alkali feldspar granite,and the metallogenic time is consistented with the diagenetic time.By synthetic analysis,the tungsten polymetallic of Dawangshan have good affinity to surrounding rock of alkali feldspar granite,and the magmaliquid immiscibility is a major cause of precipitation of W-Mo polymetallic ore.关键词
钨多金属矿床/流体包裹体/液态不混溶作用/大王山Key words
Tungsten polymetallic deposit/Fluid inclusion/Immiscibility/Dawangshan Mountain分类
天文与地球科学引用本文复制引用
杨庆坤,宣璞琰,张小亮,周万蓬,曲宏健..赣中大王山钨多金属矿床流体包裹体及H-O-S同位素特征[J].地质科学,2017,52(4):1282-1296,15.基金项目
国家自然科学基金项目(编号:41602069)、江西省教育厅科学技术研究项目(编号:GJJ150554)和放射性地质与勘探技术国防重点学科实验室开放基金项目(编号:RGET1402)资助. （编号:41602069）
