ASEG Extended Abstracts最新文献_第4页

Metasomatic/depletion events affecting Cratons and “cratons” 影响克拉通和“克拉通”的交代/枯竭事件

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072937

T. Wise, S. Thiel, R. Dutch, M. Pawley, K. Robertson

引用次数: 0

Experimental acid and scCO2 reactions of Roseneath, Epsilon and Murteree gas shales: Opening or closing of gas accessible pores and metal release to water Roseneath、Epsilon和Murteree页岩的酸性和scCO2实验反应:打开或关闭可接近气体的孔隙和金属释放到水中

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073164

J. Pearce, T. Blach, G. Dawson, Y. Melnichenko, G. Southam, S. Golding, J. Bahadur, D. Paterson

{"title":"Experimental acid and scCO2 reactions of Roseneath, Epsilon and Murteree gas shales: Opening or closing of gas accessible pores and metal release to water","authors":"J. Pearce, T. Blach, G. Dawson, Y. Melnichenko, G. Southam, S. Golding, J. Bahadur, D. Paterson","doi":"10.1080/22020586.2019.12073164","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073164","url":null,"abstract":"Summary Shale oil and gas is of recent interest in Australia, and the Roseneath, Epsilon and Murteree (REM) shales of the Cooper Basin, Australia, are unconventional gas targets. Shales have a high proportion of porosity in the submicron scale and hydraulic stimulation of USA shales has historically employed high volumes of water with dilute HCl, proppants and various chemicals. Supercritical (sc) CO2 has also been used as a fracture fluid in water sensitive formations. In addition, shales may contain high concentrations of potentially toxic or regulated components such as U, As, Pb, or BTEX which may be released to production water. Improper disposal or treatment of waste water has caused recent environmental concerns in the USA. REM shales were characterised with various techniques including high resolution synchrotron XFM for association of metals with specific minerals. Several metals and As were associated with sulphides in coal pores; Mn with siderite, and Pb with pyrite cements. Shales were reacted with dilute HCl or scCO2-water +/- SO2. The fraction of SANS gas accessible meso-pores was highest in the Epsilon Formation core. Siderite dissolved in HCl reactions, and the fraction of open meso-pores increased. Fe-rich precipitates formed in scCO2 reactions and mesopores partly closed. Mobilised concentrations of Pb, Fe, U, and Na were highest from the reactions with dilute HCl. Understanding the mineral sources of metals and their potential release with different fracture fluids may result in better predictions and mitigation options for production water. Reactions of minerals such as siderite, and sulphides may release regulated metals to production water.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"13 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80030768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Twenty years of pre-competitive geoscience data in the Capricorn Orogen: the link between mineral systems and crustal evolution 摩羯座造山带20年的竞争前地球科学数据:矿物系统与地壳演化之间的联系

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073250

S. Johnson

引用次数: 0

Pilgangoora Lithium-Tantalum Project: deposit geology and new constraints on rare-metal pegmatite genesis Pilgangoora锂钽项目:矿床地质及稀土伟晶岩成因新制约因素

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073052

J. S. Holmes, J. L. Grigson

{"title":"Pilgangoora Lithium-Tantalum Project: deposit geology and new constraints on rare-metal pegmatite genesis","authors":"J. S. Holmes, J. L. Grigson","doi":"10.1080/22020586.2019.12073052","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073052","url":null,"abstract":"Summary The Pilgangoora lithium-tantalum project encompasses a globally significant Li-Ta pegmatite district which formed in the late-Mesoarchaean, along the western margin of the East Pilbara Terrane in Western Australia. Regional field mapping, coupled with local petrographic and micro-analytical investigation into lithium and tantalum mineralisation at Pilgangoora, have allowed a first step towards developing a mineral system-type model for rare-metal pegmatites, that looks beyond the internal features of the trap site, and considers factors such as the triggers, potential sources, and pathways of rare-metal pegmatite magmas. The Li-Ta pegmatite sheets and dykes at Pilgangoora are composite bodies of three paragenetically distinct magmatic phases, each showing differing degrees of ductile strain. The intrusions are structurally controlled and were emplaced within the strain halo of a regional shear zone that is kinematically distinct from, and overprinting of, deformational structures and fabrics belonging to earlier orogenic events in the East Pilbara Terrane. A crystallisation age of 2845 ± 4 Ma for tantalite, obtained during this study, is ~15 m.y. younger than a proximal pluton of the high-K Split Rock Supersuite. This seemingly rules out direct derivation of the rare-metal pegmatite magma from what has traditionally been considered the most likely parent granitic intrusive suite. Along with the evidence for multi-phase parageneses, such a timing relationship is at odds with the currently accepted paradigm for rare-metal pegmatite genesis. The new constraints on rare-metal pegmatite genesis identified as part of this study form valuable exploration criteria, which may be applied locally to locate additional resources and, longer term, more strategically to review and target lithium-bearing pegmatite fields throughout Western Australia.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"8 1","pages":"1 - 6"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88340745","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

West Australian gold resources: crisis or hubris? 西澳大利亚黄金资源:危机还是傲慢?

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073051

J. Vearncombe

引用次数: 0

VMS and Ni-Cu exploration using an integrated geophysical and drilling method 地球物理与钻井相结合的VMS和Ni-Cu勘探

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073033

F. Effersø, E. Smart, R. Mortimer

{"title":"VMS and Ni-Cu exploration using an integrated geophysical and drilling method","authors":"F. Effersø, E. Smart, R. Mortimer","doi":"10.1080/22020586.2019.12073033","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073033","url":null,"abstract":"Summary This case study illustrates the use of an exploration method that leverages modern exploration techniques for deep-seated VMS and Ni-Cu deposits in a 978 km2 survey area in the highly prospective Areachap Belt, South Africa. The exploration method comprises the use of a high power helicopter TEM (“HTEM”) system, a large fixed loop TEM (“FLTEM”) ground system and drilling that are employed in a staged process to keep down risks and costs and more importantly to optimize the chances of discovering viable economic mineral resources. Based on the HTEM survey 19 high priority VMS targets were detected for ground follow up with FLTEM. The FLTEM data confirmed all of these targets, and 2D plate modelling refined the parameter for optimal drilling of the targets. The first result of the drilling campaign led to the discovery of a significant Ni-Cu deposit. The prospect of this case study is that the employed method may be useful for certain types of mineral exploration. Provided that the electrical conductivity contrast between the mineralisation and the host rock is sufficient then the use of HTEM and FLTEM is a viable choice. The staged exploration process ensures that potential resources are detected and that risks and costs at each step are kept down.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"1 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90188777","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Using finite dipole lengths in complete earth 3D MT modelling 有限偶极子长度在全地球三维大地电磁学建模中的应用

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073129

W. Soyer, F. Miorelli, R. Mackie

{"title":"Using finite dipole lengths in complete earth 3D MT modelling","authors":"W. Soyer, F. Miorelli, R. Mackie","doi":"10.1080/22020586.2019.12073129","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073129","url":null,"abstract":"Summary We have quantified the use of finite electric dipole lengths from the point measurement assumptions typical in 3D MT inversion modeling. Electric fields are measured across dipoles of typically 50 m to 200 m at MT soundings. Modeling algorithms, however, normally use point electric field values at the surface of single cells to calculate MT transfer functions. This is perfectly reasonable for the majority of cases, but there are situations with strong shallow variability of resistivity, where measurements may not be simulated well by point electric fields, and detailed information might not be used optimally. We explore the consequences of this omission by quantifying the difference between point solutions and electric field integrations across dipoles in 3D forward calculations for selected cases. The topic ties closely with galvanic distortion and inversion for related parameters, lateral magnetic field variations, and the benefit of providing shallower constraints for the imaging of deeper targets. As a side product, the analysis led us to focus on the fields output from the 3D modeling, and we illustrate electric current systems through the cases analyzed. We observe that in the presence of strong topography and outcropping inhomogeneities, finite dipole solutions can differ considerably from point solutions, while over a variable regolith case the effect appears more contained","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"5 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85841965","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Soil gases, pathfinders for exploration of buried sulphide deposits: insights from laboratory experiments 土壤气体，埋藏硫化物矿床勘探的探路者:来自实验室实验的见解

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073149

C. Plet, C. Siégel, R. Noble, R. Anand, M. Woltering, R. Thorne, A. Pagès, S. Spinks

{"title":"Soil gases, pathfinders for exploration of buried sulphide deposits: insights from laboratory experiments","authors":"C. Plet, C. Siégel, R. Noble, R. Anand, M. Woltering, R. Thorne, A. Pagès, S. Spinks","doi":"10.1080/22020586.2019.12073149","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073149","url":null,"abstract":"Summary The future of mineral resources in Australia relies on the discovery of deposits under sedimentary cover. Traditional surface geochemistry techniques are of limited use in this context, and alternative exploration tools such as the detection of soil gases are gaining increasing interest. Previous studies have highlighted the potential of soil gases, such as sulphur gases and soil gas hydrocarbons, for locating buried mineralisation. Here, we performed laboratory weathering experiments of sulphides under sterile and non-sterile conditions to gain insights into the origin of these gases. The experiments revealed that hydrocarbon gases could not be detected, suggesting they commonly originate from microbial ecosystems in the cover and/or in the soil. In addition, equilibrium thermodynamic predictions indicate a larger range of sulphur gases than detected, which suggests the experimental system did not reach thermal equilibrium. Our results also reveal that CS2 is the most abundant gas produced, and could be of particular interest as a pathfinder for mineral exploration through cover.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":"31 1","pages":"1 - 4"},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86035234","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

The mineral factory: how to build a giant quartz reef 矿物工厂:如何建造一个巨大的石英礁

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072994

Lisa R Tannock, M. Herwegh, A. Berger, K. Regenauer‐Lieb

引用次数: 1

MinEx CRC - Exploration innovation through industry and researcher cooperation MinEx CRC -通过行业和研究人员合作探索创新

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073085

A. Bailey, D. Giles

引用次数: 0