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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

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Geoscience Frontiers 2024年第5期15卷 339-354页

作者： alexander.simpson Stijn Glorie Martin Hand Sarah E.Gilbert Carl Spandler Marija Dmitrijeva Greg Swain Angus Nixon Jacob Mulder Carsten Münker Department of Earth Sciences University of AdelaideSA 5005Australia Mineral Exploration Cooperative Research Centre University of AdelaideSA 5005Australia Adelaide Microscopy University of AdelaideSA 5005Australia Fortescue Level 287Adelaide TerraceEast PerthWA 6005Australia Institute of Geology und Mineralogy University of Köln50674 KölnGermany British Geological Survey NottinghamUK

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

关键词： Reaction-cell ICP-MS In-situ geochronology Lu-Hf Re-Os Iron Oxide Copper Gold Metal fluids

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Collaborating remotely:an evaluation of immersive capabilities on spatial experiences and team membership

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International Journal of Digital Earth 2018年第4期11卷 420-436页

作者： Danielle Oprean Mark simpson alexander Klippel Department of Architecture The Pennsylvania State UniversityUniversity ParkPAUSA Department of Geography The Pennsylvania State UniversityUniversity ParkPAUSA

Today’s workforce environments are steadily becoming more distributed across the globe,calling for improved ways of facilitating collaborations at a distance,including geo-collaborations or collaborations at critical *** technology is allowing distributed teams to move away from traditional conference rooms,taking collaborations into the field and giving remote teams more information about the *** idea of situating a remote collaborator’s experiences in the field,virtually,promises to enhance the understanding of geographically remote *** technologies in virtual reality(VR)hold promise for providing mobile spatial experiences in real-time,without being tied to fixed hardware,such as systems in conference *** exploratory study using VR technology on remote user experiences in a collaboration was conducted to identify the added value for remote *** findings suggest immersive capabilities improve feelings of presence in the remote locations and perceptions of being in the remote location increase feelings of team membership.

关键词： Presence geo-collaboration virtual reality

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Laser ablation(in situ)Lu-Hf dating of magmatic fluorite and hydrothermal fluorite-bearing veins

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Geoscience Frontiers 2023年第6期14卷 142-154页

作者： Stijn Glorie Jacob Mulder Martin Hand Adrian Fabris alexander.simpson Sarah Gilbert Department of Earth Sciences University of AdelaideSA 5005Australia Geological Survey of South Australia Department for Energy and MiningAdelaideSA 5005Australia Adelaide Microscopy University of AdelaideSA 5005Australia

Fluorite(CaF_(2))is a common hydrothermal mineral,which precipitates from fluorine-rich fluids with an exceptional capacity to transport metals and Rare Earth Elements(REEs).Hence,the ability to date fluorite has important implications for understanding the timing of metal transport in hydrothermal *** we present,for the first time,fluorite Lu-Hf dates from fluorite-carbonate veins from the Olympic Cu-Au Province in South *** fluorite dates were obtained in situ using the recently developed LA-ICP-MS/MS Lu-Hf dating method.A fluorite-calcite age of 1588±19 Ma was obtained for the Torrens Dam prospect,consistent with the timing of the formation of the nearby Olympic Dam iron-oxide copper gold Breccia *** in the overlying Neoproterozoic successions were dated at 502±14 Ma,indicating a temporal link between Cu-sulphide remobilisation and the Delamerian ***,we present a multi-session reproducible date for magmatic fluorite from a monzogranite in the Pilbara Craton(Lu-Hf age of 2866±19 Ma).This age is consistent with a garnet Lu-Hf age from the same sample(2850±12 Ma)and holds potential to be developed into a secondary reference material for future fluorite Lu-Hf dating.

关键词： Reaction-cell ICP-MS In-situ geochronology Fluorite-calcite veins Iron oxide copper-gold Critical mineral exploration Rare Earth Elements

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In situ Lu–Hf phosphate geochronology:Progress towards a new tool for space exploration

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Geoscience Frontiers 2022年第3期13卷 164-167页

作者： Stijn Glorie Thomas Burke Martin Hand alexander.simpson Sarah Gilbert Benjamin Wade Department of Earth Sciences The University of AdelaideSA 5005 AdelaideAustralia Adelade Microscopy The University of AdelaideSA 5005 AdelaideAustralia

Geochronology is fundamental to understanding planetary ***,as space exploration continues to expand,traditional dating methods,involving complex laboratory processes,are generally not realistic for unmanned space ***-style planetary exploration missions require dating methods that can(1)rapidly resolve age information on small samples,(2)be applied to minerals common in mafic rocks,and(3)be based on technologies that could be installed on future rover *** demonstrate the application of rapid in situ microanalytical Lu–Hf phosphate geochronology using samples of pallasite meteorites,which are representative examples of the deep interiors of differentiated planetoids that are generally difficult to *** pallasites were dated by laser ablation tandem mass-spectrometry(LA-ICP-MS/MS),demonstrating a rapid novel method for exploring planetary *** formation ages for individual pallasites agree with traditional methods and have<2%uncertainty,opening an avenue of opportunity for remote micro-analytical space exploration.

关键词： Pallasite meteorites Lu-Hf geochronology Laser ablation tandem mass-spectrometry Micro-analytical planetary exploration

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Two haplotype-resolved genomes reveal important flower traits in bigleaf hydrangea(Hydrangea macrophylla)and insights into Asterid evolution

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Horticulture Research 2023年第12期10卷 45-57页

作者： Xingbo Wu Sheron A.simpson Ramey C.Youngblood Xiaofen FLiu Brian E.Scheffler Timothy A.Rinehart Lisa W.alexander Amanda M.Hulse-Kemp Department of Environmental Horticulture Tropical Research and Education CenterUniversity of FloridaHomesteadFL 33031United States Genomics and Bioinformatics Research Unit USDA-ARSRaleighNC 27695United States Genomics and Bioinformatics Research Unit USDA-ARSStonevilleMS 38776United States Institute for Genomics Biocomputing and BiotechnologyMississippi State UniversityStarkvilleMS 39762United States Crop Production and Protection USDA-ARSBeltsvilleMD 20705United States Floral and Nursery Plants Research Unit U.S.National ArboretumUSDA-ARSMcMinnvilleTN 37110United States Department of Crop and Soil Sciences North Carolina State UniversityRaleighNC 27695United States

The Hydrangea genus belongs to the Hydrangeaceae family,in the Cornales order of flowering plants,which early diverged among the Asterids,and includes several species that are commonly used ornamental *** them,Hydrangea macrophylla is one of the most valuable species in the nursery trade,yet few genomic resources are available for this crop or closely related Asterid *** high-quality haplotype-resolved reference genomes of hydrangea cultivars‘Veitchii’and‘Endless Summer’[highest quality at 2.22 gigabase pairs(Gb),396 contigs,N5022.8 megabase pairs(Mb)]were assembled and scaffolded into the expected 18 *** the newly developed high-quality reference genomes along with high-quality genomes of other related flowering plants,nuclear data were found to support a single divergence point in the Asterids clade where both the Cornales and Ericales diverged from the *** mapping with an F1 hybrid population demonstrated the power of linkage mapping combined with the new genomic resources to identify the gene for inflorescence shape,CYP78A5 located on chromosome 4,and a novel gene,BAM3 located on chromosome 17,for causing double *** developed in this study will not only help to accelerate hydrangea genetic improvement but also contribute to understanding the largest group of flowering plants,the Asterids.

关键词： Hydra traits resolved

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Vegetation cover of the lahar valley on the Sarychev Peak volcano(Matua Isl.,Middle Kuril Islands) after the Eruption in 2009: current state and features of succession processes

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Journal of Mountain Science 2021年第7期18卷 1762-1777页

作者： Fedor A.ROMANYUK alexander V.KORDYUKOV Institute of Marine Geology and Geophysics Far East Branch Russian Academy of Sciences693022Yuzhno-SakhalinskNauki Street1bSakhalin regionRussia

The paper presents the study of the vegetation recovery after the descent of the lahar during the eruption of the Sarychev Peak volcano(Matua Isl.,Middle Kuriles) in *** works were carried out in *** was found that during the secondary succession,plant communities,typical of the altitudinal zonation of the volcanic structure vegetation,are formed on lahar sediments in the following manner: the upper sections of the slope are occupied by sparse meadow and shrub vegetation,the middle are presented by shrub belt with a developed canopy,and the lower are representative of shrub large-grass *** the same time,the ordination analysis of the vegetation cover of the lahar valley by the detrended correspondence analysis(DCA) revealed the dispersion of the counting areas along the altitudinal *** is opposite to that characteristic for both,the background communities on the slopes of the studied volcanic structure,and for communities in dynamical equilibrium of a typical altitude ***,directly correlating indicators of α-diversity of communities indicate the presence of open young communities at the stage of a complex *** the species Duschekia fruticosa which is an identifier in buried sites,forms communities in a state of dynamic equilibrium,with individuals of 40–50 years old,and at the time of the work,formed a canopy with individuals of 7–8 years old,a complete recovery of the communities of the lahar valley is possible in no less than 40 *** acquired data on the recovery of vegetation on lahar contribute to the study of succession processes in the sites located in the zone of active *** addition,in this work,for the first time,the rates of restoration of the vegetation cover following its destruction as a result of burial by lahar products,are *** specific features of this process are also *** the broad range of mathematical methods for quantitative analysis of indicators of young commun

关键词： Sarychev Peak volcano Lahar Plant communities Secondary succession Indirect ordination Correlation analysis Shannon-Weaver index of biodiversity simpson S dominance

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从运营中释放现金

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经济管理文摘 2009年第4期 48-48页

作者： alexander Niemeyer Bruce simpson

当经济进入低迷期时。企业应该避免不分青红皂白冲动地压缩运营。以平衡的观点对待运营并采取短期措施能够保持健康的现金流。

关键词：资金管理企业管理经营策略经济活动

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Performance and calibration of quark/gluon-jet taggers using 140 fb^(-1) of pp collisions at √s=13 TeV with the ATLAS detector

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Chinese Physics C 2024年第2期48卷 1-25页

作者： G. Aad B. Abbott K. Abeling N.J. Abicht S.H. Abidi A. Aboulhorma H. Abramowicz H. Abreu Y. Abulaiti B.S. Acharya C. Adam Bourdarios L. Adamczyk S.V. Addepalli M.J. Addison J. Adelman A. Adiguzel T. Adye A.A. Affolder Y. Afik M.N. Agaras J. Agarwala A. Aggarwal C. Agheorghiesei A. Ahmad F. Ahmadov W.S. Ahmed S. Ahuja X. Ai G. Aielli A. Aikot M. Ait Tamlihat B. Aitbenchikh I. Aizenberg M. Akbiyik T.P.A. Åkesson A.V. Akimov D. Akiyama N.N. Akolkar K. Al Khoury G.L. Alberghi J. Albert P. Albicocco G.L. Albouy S. Alderweireldt M. Aleksa I.N. Aleksandrov C. Alexa T. Alexopoulos F. Alfonsi M. Algren M. Alhroob B. Ali H.M.J. Ali S. Ali S.W. Alibocus M. Aliev G. Alimonti W. Alkakhi C. Allaire B.M.M. Allbrooke J.F. Allen C.A. Allendes Flores P.P. Allport A. Aloisio F. Alonso C. Alpigiani M. Alvarez Estevez A. Alvarez Fernandez M. Alves Cardoso M.G. Alviggi M. Aly Y. Amaral Coutinho A. Ambler C. Amelung M. Amerl C.G. Ames D. Amidei S.P. Amor Dos Santos K.R. Amos V. Ananiev C. Anastopoulos T. Andeen J.K. Anders S.Y. Andrean A. Andreazza S. Angelidakis A. Angerami A.V. Anisenkov A. Annovi C. Antel M.T. Anthony E. Antipov M. Antonelli F. Anulli M. Aoki T. Aoki J.A. Aparisi Pozo M.A. Aparo L. Aperio Bella C. Appelt A. Apyan N. Aranzabal S.J. Arbiol Val C. Arcangeletti A.T.H. Arce E. Arena J-F. Arguin S. Argyropoulos J.-H. Arling O. Arnaez H. Arnold G. Artoni H. Asada K. Asai S. Asai N.A. Asbah J. Assahsah K. Assamagan R. Astalos S. Atashi R.J. Atkin M. Atkinson H. Atmani P.A. Atmasiddha K. Augsten S. Auricchio A.D. Auriol V.A. Austrup G. Avolio K. Axiotis G. Azuelos D. Babal H. Bachacou K. Bachas A. Bachiu F. Backman A. Badea P. Bagnaia M. Bahmani A.J. Bailey V.R. Bailey J.T. Baines L. Baines O.K. Baker E. Bakos D. Bakshi Gupta V. Balakrishnan R. Balasubramanian E.M. Baldin P. Balek E. Ballabene F. Balli L.M. Baltes W.K. Balunas J. Balz E. Banas M. Bandieramonte A. Bandyopadhyay S. Bansal L. Barak M. Barakat E.L. Barberio D. Barberis M. Barbero M.Z. Barel K.N. Barends T. Barillari M-S. Barisits T. Barklow P. Baron D.A. Baron Mo The ATLAS Collaboration

The identification of jets originating from quarks and gluons,often referred to as quark/gluon tagging,plays an important role in various analyses performed at the Large Hadron Collider,as Standard Model measurements and searches for new particles decaying to quarks often rely on suppressing a large gluon-induced *** paper describes the measurement of the efficiencies of quark/gluon taggers developed within the ATLAS Collaboration,using √s=13 TeV proton–proton collision data with an integrated luminosity of 140 fb^(-1) collected by the ATLAS *** taggers with high performances in rejecting jets from gluon over jets from quarks are studied:one tagger is based on requirements on the number of inner-detector tracks associated with the jet,and the other combines several jet substructure observables using a boosted decision tree.A method is established to determine the quark/gluon fraction in data,by using quark/gluon-enriched subsamples defined by the jet *** in tagging efficiency between data and simulation are provided for jets with transverse momentum between 500 GeV and 2 TeV and for multiple tagger working points.

关键词： ATLAS JET QUARK GLUON TAGGING

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