Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic-Hydrothermal Ore Systems

doi:10.3390/min9060364

CORC > 地质与地球物理研究所 > 中国科学院地质与地球物理研究所 > 中国科学院矿产资源研究重点实验室

	Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic-Hydrothermal Ore Systems
	Courtney-Davies, Liam 1; Ciobanu, Cristiana L.1; Verdugo-Ihl, Max R.1; Slattery, Ashley 2; Cook, Nigel J.1; Dmitrijeva, Marija 1; Keyser, William 1; Wade, Benjamin P.2; Domnick, Urs I.1; Ehrig, Kathy 3
刊名	MINERALS
	2019-06-01
卷号	9 期号:6 页码:34
关键词	zircon IOCG deposits Olympic Cu-Au Province HAADF STEM Fe-Cl-metasomatism chloro-hydroxy-zircon nanoprecipitates granite fertility
ISSN号	2075-163X
DOI	10.3390/min9060364
英文摘要	The petrography and geochemistry of zircon offers an exciting opportunity to better understand the genesis of, as well as identify pathfinders for, large magmatic-hydrothermal ore systems. Electron probe microanalysis, laser ablation inductively coupled plasma mass spectrometry, high-angle annular dark-field scanning transmission electron microscopy (HAADF-STEM) imaging, and energy-dispersive X-ray spectrometry STEM mapping/spot analysis were combined to characterize Proterozoic granitic zircon in the eastern Gawler Craton, South Australia. Granites from the similar to 1.85 Ga Donington Suite and similar to 1.6 Ga Hiltaba Suite were selected from locations that are either mineralized or not, with the same style of iron-oxide copper gold (IOCG) mineralization. Although Donington Suite granites are host to mineralization in several prospects, only Hiltaba Suite granites are considered fertile in that their emplacement at similar to 1.6 Ga is associated with generation of one of the best metal-endowed IOCG provinces on Earth. Crystal oscillatory zoning with respect to non-formula elements, notably Fe and Cl, are textural and chemical features preserved in zircon, with no evidence for U or Pb accumulation relating to amorphization effects. Bands with Fe and Ca show mottling with respect to chloro-hydroxy-zircon nanoprecipitates. Lattice defects occur along fractures crosscutting such nanoprecipitates indicating fluid infiltration post-mottling. Lattice stretching and screw dislocations leading to expansion of the zircon structure are the only nanoscale structures attributable to self-induced irradiation damage. These features increase in abundance in zircons from granites hosting IOCG mineralization, including from the world-class Olympic Dam Cu-U-Au-Ag deposit. The nano- to micron-scale features documented reflect interaction between magmatic zircon and corrosive Fe-Cl-bearing fluids in an initial metasomatic event that follows magmatic crystallization and immediately precedes deposition of IOCG mineralization. Quantification of alpha-decay damage that could relate zircon alteration to the first percolation point in zircon gives similar to 100 Ma, a time interval that cannot be reconciled with the 2-4 Ma period between magmatic crystallization and onset of hydrothermal fluid flow. Crystal oscillatory zoning and nanoprecipitate mottling in zircon intensify with proximity to mineralization and represent a potential pathfinder to locate fertile granites associated with Cu-Au mineralization.
资助项目	project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; ARC Research Hub for Australian Copper-Uranium[IH130200033]
WOS关键词	TRACE-ELEMENT SIGNATURES ; BANDED IRON-FORMATION ; SOUTH-AUSTRALIA ; OLYMPIC DAM ; MIDDLEBACK RANGES ; GAWLER CRATON ; GEOCHRONOLOGICAL CONSTRAINTS ; RADIATION-DAMAGE ; PB ; EVOLUTION
WOS研究方向	Mineralogy ; Mining & Mineral Processing
语种	英语
出版者	MDPI
WOS记录号	WOS:000473809300037
资助机构	project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; ARC Research Hub for Australian Copper-Uranium ; ARC Research Hub for Australian Copper-Uranium ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; ARC Research Hub for Australian Copper-Uranium ; ARC Research Hub for Australian Copper-Uranium ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; ARC Research Hub for Australian Copper-Uranium ; ARC Research Hub for Australian Copper-Uranium ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; project "Trace elements in iron-oxides: deportment, distribution and application in ore genesis, geochronology, exploration and mineral processing" - BHP Olympic Dam ; South Australian Government Mining and Petroleum Services Centre of Excellence ; South Australian Government Mining and Petroleum Services Centre of Excellence ; ARC Research Hub for Australian Copper-Uranium ; ARC Research Hub for Australian Copper-Uranium
内容类型	期刊论文
源URL	[http://ir.iggcas.ac.cn/handle/132A11/92673]
专题	地质与地球物理研究所_中国科学院矿产资源研究重点实验室
通讯作者	Courtney-Davies, Liam
作者单位	1.Univ Adelaide, Sch Chem Engn & Adv Mat, Adelaide, SA 5005, Australia 2.Univ Adelaide, Adelaide Microscopy, Adelaide, SA 5005, Australia 3.BHP Olymp Dam, Adelaide, SA 5000, Australia 4.Chinese Acad Sci, Inst Geol & Geophys, Key Lab Mineral Resources, Beijing 100029, Peoples R China
推荐引用方式 GB/T 7714	Courtney-Davies, Liam,Ciobanu, Cristiana L.,Verdugo-Ihl, Max R.,et al. Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic-Hydrothermal Ore Systems[J]. MINERALS,2019,9(6):34.
APA	Courtney-Davies, Liam.,Ciobanu, Cristiana L..,Verdugo-Ihl, Max R..,Slattery, Ashley.,Cook, Nigel J..,...&Kontonikas-Charos, Alkiviadis.(2019).Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic-Hydrothermal Ore Systems.MINERALS,9(6),34.
MLA	Courtney-Davies, Liam,et al."Zircon at the Nanoscale Records Metasomatic Processes Leading to Large Magmatic-Hydrothermal Ore Systems".MINERALS 9.6(2019):34.