Ore-Forming Fluids and Metallogenetic Mechanism of Sibozi-Liubozi Molybdenum-Copper Deposit in Qinglong County , Hebei
详细信息
- 责任者：Li Qiang (MLR Key Laboratory of Metallogeny and Mineral Assessment ; Institute of Mineral Resources ; Chinese Academy of Geological Sciences ; Beijing 1 00037 ; China) ; Meng Xiangyuan
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(1)
- 关键词：钼矿 ; molybdenum ores ; 铜矿 ; copper ores ; 成矿流体 ; ore-forming fluids ; 河北 ; Hebei Province
- 页码：p.302-318
- 图表：12 illus., 4 tables, 43 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Sibozi-Liubozi molybdenum-copper deposit in Qinglong County is located in the east of Yanliao metallogenic belt,which is a newly-discovered medium-sized molybdenum-copper deposit.Molybdenite occurs in veinlets,stockwork,disseminated and membrane in the skarn hosted in quartz sandstone and dolomite,Changcheng System.The molybdenum mineralization is closely related with silicification.Ore bodies occur as bedded-like,vein and lenticular.On the basis of field evidence and petrographic analysis,the ore-forming process can be divided into two mineralization periods:skarn and quartz-sulfide.The quartz-sulfide period represents the main molybdenum-copper mineralization episode in the Sibozi-Liubozi deposit.Inclusions of the skarn period are dominantly fluid inclusions,while inclusions in quartz of the quartz-sulfide period mostly contain liquid inclusions,CO 2bearing three-phase inclusions and pure CO2 phase inclusions.Ore-forming fluids of skarn period are NaCl-H2 O system,the homogenization temperatures and salinities vary from 1 92 to 497℃and from 5.41%to 1 6.53%equivalent respectively while the densities range from 0.59 to 0.92g/ cm 3 .Ore-forming fluids of quartz-sulfide period are NaCl-H2 O-CO2(±CH 4 /N2)type of fluids,the homogenization temperatures and salinities vary mainly from 1 60 to 330℃and from 2.07%to 1 5.1 7%equivalent respectively while the densities range from 0.69 to 1.01 g/cm 3 .Theδ 18 O SMOW values of quartz in the ore vein range from 9.6‰to 1 4‰with correspondingδ 18 O H2 O values of-3.61‰to 5.30‰andδD values of fluid inclusions between-1 28‰and-80‰.The isotopic data imply that the ore-forming fluids of SiboziLiubozi molybdenum-copper deposit have the characteristic of mixing magmatic and meteoric water.Theδ 34S values of sulfide range from-0.9‰to 5.7‰with an average of 2.9‰,indicating that the sulfur in the fluids was derived from deep-seated magma.The Sibozi-Liubozi molybdenum-copper deposit took place in the earlier times of Early Jurassic,with its metallogenesis related to the late granite porphyry magma hydrothermal activity.
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