In situ apatite and carbonate Lu-Hf and molybdenite Re-Os geochronology for ore deposit research:Method validation and example application to Cu-Au mineralisation
作者机构：Department of Earth SciencesUniversity of AdelaideSA 5005Australia Mineral Exploration Cooperative Research CentreUniversity of AdelaideSA 5005Australia Adelaide MicroscopyUniversity of AdelaideSA 5005Australia FortescueLevel 287Adelaide TerraceEast PerthWA 6005Australia Institute of Geology und MineralogyUniversity of Köln50674 KölnGermany British Geological SurveyNottinghamUK
出 版 物：《Geoscience Frontiers》 (地学前缘（英文版）)
年 卷 期：2024年第15卷第5期
页 面：339-354页
核心收录：
学科分类：081801[工学-矿产普查与勘探] 08[工学] 0818[工学-地质资源与地质工程]
基 金：supported by an Accelerated Discovery Initiative Grant(ADI RD02/260),entitled‘Integrated Exploration Under Deep Cover‘with joint funding from Fortescue and the Government of South Australia SG was further supported by an Australian Research Council Future Fellowship(FT210100906) The acquisition of isotope-dilution Lu-Hf dates was financially supported by the Mineral Exploration Cooperative Research Centre whose activities are funded by the Australian Government’s Cooperative Research Centre Program
主 题：Reaction-cell ICP-MS In-situ geochronology Lu-Hf Re-Os Iron Oxide Copper Gold Metal fluids
摘 要：The development of laser ablation inductively coupled plasma quadrupole tandem mass spectrometry(LA-ICP-Q-MS/MS)opens new opportunities to rapidly date a variety of hydrothermal *** we present in situ Lu-Hf and Re-Os dates for hydrothermal apatite and molybdenite,*** further report the first in situ Lu-Hf dates for bastnäsite,dolomite,and siderite,and assess their potential for constraining ore deposit *** method validation,we report isotope-dilution Lu-Hf dates for apatite reference material Bamble-1(1102±5 Ma)and calcite reference material ME-1(1531±7 Ma),enabling improved accuracy on matrix-matched calibration for LA-ICP-MS/MS Lu-Hf *** new methods are applied to the Vulcan Iron-Oxide Copper-Gold(IOCG)prospect in the Olympic Cu-Au Province of South *** deposits have been difficult to accurately date,given the general lack of reliable mineral geochronometers that are cogenetic with IOCG *** apatite Lu-Hf dates and molybdenite Re-Os dates demonstrate that mineralisation at Vulcan largely occurred at ca.1.6 Ga,contemporaneous with the world class Olympic Dam *** data also indicates that the Lu-Hf system in apatite is more robust than the U-Pb system for determining the timing of primary apatite formation in an IOCG *** further demonstrate that dolomite can retain Lu-Hf growth ages over an extended time period(1.5 billion years),providing constraints on the timing of primary ore mineral crystallisation during brecciation and IOCG ***,late Neoproterozoic(ca.589–544 Ma)and Carboniferous(ca.334±7 Ma)Lu-Hf dates were obtained for texturally late Cubearing carbonate veins,illustrating that the carbonate Lu-Hf method allows direct dating of Cu remobilisation *** has important implications for mineral exploration as the remobilised Cu may have been transferred to younger deposits hosted in Neoproterozoic sedimentary basins overlaying the Olympic IOCG provi
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