Global Geology 2021, 24(2) 80-88 DOI:     ISSN: 1673-9736 CN: 22-1371/P

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Keywords
 fluid inclusions
S isotopes
H-O isotopes
metallogenesis
Qinggouzi stibnite deposit
orogenic
deposits
Authors
BAKHT Shahzad
SUN Fengyue
WANG Linlin
XU Chenghan
YE Lina
ZHU Xinran and FAN Xingzhu
PubMed
Article by Bakht S
Article by Sun F
Article by Wang L
Article by Xu C
Article by Ye L
Article by Zhu XAFX

 Origin of ore-forming fluids in Qinggouzi stibnite deposit,NE China: Constraints from fluid inclusions and H-O-S isotopes

 BAKHT Shahzad,SUN Fengyue,WANG Linlin,XU Chenghan,YE Lina,

ZHU Xinran and FAN Xingzhu

 College of Earth Sciences,Jilin University,Changchun 130061,China

Abstract

 The Qinggouzi stibnite deposit is located in Huashan Town,Jilin Province,in the northeastern margin of North China Craton ( NCC) . It is controlled by fault structures,hosted within structurally controlled felsic dykes,predominantly surrounded by phyllite,schist and quartzite. This study presents the results of fluid

inclusions studies,intending to determine the source of the fluid responsible for ore-formation,hence exploring its metallogenesis. The aqueous biphase inclusions are identified in the stibnite-bearing quartz veins of the deposit.Moreover,aqueous biphase inclusions are further classified into ① biphase liquid-rich inclusions ( 1a)
and ② biphase gas-rich inclusions ( 1b) depending upon liquid to gas ratio trapped within the fluid inclusions. Homogenization temperatures for ( 1a) and ( 1b) range between 114. 8℃ to 422℃ and 128. 3℃ to 267. 5℃,
respectively. 1a and 1b have salinities of 0. 18% to 16. 14% NaCleqv and 1. 22% to 12. 88% NaCleqv ,and density range from 0. 43 to 1. 02 g /cm3 and 0. 81 to 0. 98 g /cm3,respectively. Sulfur isotopic analysis indicates
δ34SV-CDT from 4. 4 × 10 - 3 to 6. 5 × 10 - 3,with an average of 5. 2 × 10 - 3,whereas H isotopes values on δDV-SMOW standard are - 100. 8 × 10 - 3 and - 107. 5 × 10 - 3,while O isotopes data on δ18OV-SMOW standard range between 20. 1 × 10 - 3 and 20. 4 × 10 - 3 . Fluid inclusions study,combining with sulfur and H-O isotopic data reveal that the ore-forming fluids originated from deep source and were subsequently contaminated by meteoric water. Hydrostatic pressure calculation shows that the minimum and maximum pressures are 11. 65 and 42. 33 MPa,and relevant depths of deposit are estimated to be 1. 16 and 4. 23 km. Finally,we inferred that Qinggouzi stibnite deposit is a medium-low temperature,low salinity hydrothermal deposit,which is formed by deep source and later contaminated by meteoric water,and is classified as epizonal deposit in terms of orogenic series.

Keywords  fluid inclusions   S isotopes   H-O isotopes   metallogenesis   Qinggouzi stibnite deposit   orogenic
deposits
  
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