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Fluid properties and origins of the Lannigou Carlin-type gold deposit, SW China: Evidence from SHRIMP oxygen isotopes and LA-ICP-MS trace element compositions of hydrothermal quartz

Yan, Jun; Mavrogenes, John; Liu, Shen; Coulson, Ian M.

Description

Oxygen isotope and trace elements characteristics of ore-related quartz from Lannigou gold deposit, a typical fault-control second largest Carlin-type Au deposit in SW China, provide valuable information about the prop- erties and origins of the ore-forming fluids. Previous works has focused on vein quartz instead of ore-related jasperoid-like quartz grain due to hard separation. Based upon different cathodoluminescence (CL) textural patterns and intensities observed within the quartz, four...[Show more]

dc.contributor.authorYan, Jun
dc.contributor.authorMavrogenes, John
dc.contributor.authorLiu, Shen
dc.contributor.authorCoulson, Ian M.
dc.date.accessioned2022-01-10T23:21:36Z
dc.identifier.issn0375-6742
dc.identifier.urihttp://hdl.handle.net/1885/258298
dc.description.abstractOxygen isotope and trace elements characteristics of ore-related quartz from Lannigou gold deposit, a typical fault-control second largest Carlin-type Au deposit in SW China, provide valuable information about the prop- erties and origins of the ore-forming fluids. Previous works has focused on vein quartz instead of ore-related jasperoid-like quartz grain due to hard separation. Based upon different cathodoluminescence (CL) textural patterns and intensities observed within the quartz, four generations of quartz from this deposit were identified: Quartz I is sedimentary detrital quartz; Quartz II is syn-mineralization jasperoid-like quartz intergrown with and/or containing fine (< 10 μm) As-bearing pyrite and arsenopyrite; Quartz III is late-mineralization veinlet quartz with a small of medium-coarse-grained (about 50–100 μm) As-bearing pyrite; and Quartz IV is the post- mineralization drusy thick-veined quartz. Analyses by sensitive high-resolution ion microprobe (SHRIMP) and laser ablation inductively coupled mass spectrometry (LA-ICP-MS) were used to determine O isotope and trace elements compositions of quartz formed in different stages. The trace elemental (e.g., Al, Li, Ge, Ti) variation of quartz from Quartz II to IV reflect the effects of fluid saturation in CO2 as the result of decarbonization reactions, followed by a progressive fall in CO2, whereas the fluid pH and intensity of argillic alteration increase, pro- gressively. The range of δ18OVSMOW values in Quartz II (12.1–24.8‰) is wide but narrows in Quartz III (24.1–27.8‰) and IV (24.3–26.9‰). The estimated fluid δ18O values of early- or main-stage (calculated from Quartz II) is 3.2–15.9‰, the late-stage (calculated from Quartz III) is 12.5–16.2‰, and the post-stage (calcu- lated from Quartz IV) is 9.0–11.5‰. It is suggested that the ore-forming fluids of Lannigou gold deposit reflect a mixed source: a low O isotope end-member that was magmatic- or basement related, whereas the high O isotope end-member may have been fluid interacted with wall-rock, whose influence strengthened during the miner- alization episode. The narrow δ18OVSMOW ranges of Quartz III and IV also suggest that any meteoric water influence on the late hydrothermal system was weak.
dc.description.sponsorshipThis research was jointly funded by the key project of National Natural Science Foundation of China (41830432), National Natural Science Foundation of China for Youth Scientist (41903044) and the China Postdoctoral Science Foundation (2018M643531)
dc.format.mimetypeapplication/pdf
dc.language.isoen_AU
dc.publisherElsevier
dc.rights© 2020 Elsevier B.V.
dc.sourceJournal of Geochemical Exploration
dc.subjectLannigou Carlin-type Au deposit
dc.subjectQuartz
dc.subjectLA-ICP-MS trace elements
dc.subjectSHRIMP oxygen isotope
dc.subjectOre-forming fluid
dc.titleFluid properties and origins of the Lannigou Carlin-type gold deposit, SW China: Evidence from SHRIMP oxygen isotopes and LA-ICP-MS trace element compositions of hydrothermal quartz
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume215
dc.date.issued2020
local.identifier.absfor040306 - Mineralogy and Crystallography
local.identifier.ariespublicationa383154xPUB14259
local.publisher.urlhttp://www.elsevier.com/
local.type.statusPublished Version
local.contributor.affiliationYan, Jun, Chinese Academy of Sciences
local.contributor.affiliationMavrogenes, John, College of Science, ANU
local.contributor.affiliationLiu, Shen, Northwest University
local.contributor.affiliationCoulson, Ian M., University of Regina
local.description.embargo2099-12-31
local.bibliographicCitation.startpage1
local.bibliographicCitation.lastpage14
local.identifier.doi10.1016/j.gexplo.2020.106546
local.identifier.absseo970104 - Expanding Knowledge in the Earth Sciences
dc.date.updated2020-12-06T07:18:04Z
CollectionsANU Research Publications

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