IGGCAS OpenIR  > 矿产资源研究院重点实验室
Evolution of fluids in the Dasuji porphyry Mo deposit on the northern margin of the North China Craton: Constraints from Microthermometric and LA-ICP-MS analyses of fluid inclusions
Chen, Peiwen1,2,3; Zeng, Qingdong1,2,3; Zhou, Tiancheng1,2,3; Wang, Yongbin1,2; Yu, Bing1,2,3; Chen, Junqi4
2019
Source PublicationORE GEOLOGY REVIEWS
ISSN0169-1368
Volume104Pages:26-45
AbstractThe newly discovered Dasuji Mo deposit is located on the northern margin of the North China Craton, and the Mo mineralization is related to Triassic granite porphyry and quartz porphyry. Alteration associated with the deposit includes silicification, sericitization, chloritization, K-feldspathization, kaolinitization, carbonatization, and fluoritization. The silicification and sericitization (phyllic alteration) are closely related to the Mo mineralization. Based on mineral assemblages and cross-cutting relationships, the hydrothermal ore-forming process can be divided into four stages: stage 1 is characterized by K-feldspathization with minor molybdenum mineralization; stage 2 is the main stage of molybdenum mineralization; stage 3 is involved in lead-zinc mineralization; and stage 4 is characterized by no mineralization. Four types of fluid inclusions are recognized: liquid rich, gas-rich, CO2-H2O, and daughter-mineral-bearing. Microthermometric data show a decrease in homogenization temperatures and salinities from the early to late stages, so that stages 1-4 show homogenization temperatures of 468-375, 435-271, 318-206, and 222-142 degrees C, respectively, and the fluids of stages 1, 3, and 4 had salinities of 2.57-16.50 (along with a few high-salinity inclusions: 32.04-48.05), 0.88-11.19, and 0.88-7.45 wt% NaCl equiv., respectively. The salinities of stage 2 fluid inclusions have a bimodal distribution: 1.40-17.48 and 29.20-53.25 wt% NaCl equiv. Laser ablation inductive coupled plasma mass spectrometer (LA-ICP-MS) analyses show that the fluid compositions are dominated by Na, K, Fe, and Mn. In stage 2 fluid inclusions, the Mo concentrations vary over a range of more than one order of magnitude (more than for any other element) as a result of fluid-rock interactions and molybdenite precipitation. Cu concentrations remain always relatively high in the fluids during their evolution (26-7092 ppm) because there was little chalcopyrite precipitation. The stage 3 fluid inclusions are rich in Mn, Pb, and Zn, while Ag concentrations increased in stage 3 and 4 fluid due to the addition of meteoric water from the surrounding rock. Reactions between the wallrock and hydrothermal fluids affected the composition of the hydrothermal fluids; sericitic alteration in particular had a great effect on fluid compositions, manifesting the variety of the content of Sr, Ba, Ca, Pb. The ore-forming fluids were mainly magmatic-hydrothermal fluids that were mixed with meteoric water during stages 3 and 4. Fluid immiscibility, a rapid decrease in pressure, fluid-rock reactions and fluid cooling were collectively responsible for the sulfide precipitation in the Dasuji deposit.
KeywordFluid inclusions Microthermometry LA-ICP-MS H-O isotopes Dasuji porphyry Mo deposit Northern margin of the North China Craton
DOI10.1016/j.oregeorev.2018.10.012
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS KeywordMAGMATIC-HYDROTHERMAL FLUIDS ; FREEZING-POINT DEPRESSION ; COPPER-MOLYBDENUM DEPOSIT ; EQUATION-OF-STATE ; NEW-MEXICO ; CH4-CO2-H2O SYSTEM ; MELT INCLUSIONS ; SILICATE MELTS ; ORE-DEPOSIT ; EL-SALVADOR
Language英语
Funding ProjectNational Natural Science Foundation of China[41390443]
Funding OrganizationNational Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Natural Science Foundation of China
WOS Research AreaGeology ; Mineralogy ; Mining & Mineral Processing
WOS SubjectGeology ; Mineralogy ; Mining & Mineral Processing
WOS IDWOS:000460710600003
PublisherELSEVIER SCIENCE BV
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/90911
Collection矿产资源研究院重点实验室
Corresponding AuthorZeng, Qingdong
Affiliation1.Chinese Acad Sci, Key Lab Mineral Resources, Inst Geol & Geophys, Beijing 100029, Peoples R China
2.Chinese Acad Sci, Inst Earth Sci, Beijing 100029, Peoples R China
3.Univ Chinese Acad Sci, Collage Earth Sci, Beijing 100049, Peoples R China
4.Inner Mongolia Zhongxi Min Co Ltd, Inner Mongolia 012300, Peoples R China
Recommended Citation
GB/T 7714
Chen, Peiwen,Zeng, Qingdong,Zhou, Tiancheng,et al. Evolution of fluids in the Dasuji porphyry Mo deposit on the northern margin of the North China Craton: Constraints from Microthermometric and LA-ICP-MS analyses of fluid inclusions[J]. ORE GEOLOGY REVIEWS,2019,104:26-45.
APA Chen, Peiwen,Zeng, Qingdong,Zhou, Tiancheng,Wang, Yongbin,Yu, Bing,&Chen, Junqi.(2019).Evolution of fluids in the Dasuji porphyry Mo deposit on the northern margin of the North China Craton: Constraints from Microthermometric and LA-ICP-MS analyses of fluid inclusions.ORE GEOLOGY REVIEWS,104,26-45.
MLA Chen, Peiwen,et al."Evolution of fluids in the Dasuji porphyry Mo deposit on the northern margin of the North China Craton: Constraints from Microthermometric and LA-ICP-MS analyses of fluid inclusions".ORE GEOLOGY REVIEWS 104(2019):26-45.
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