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":null,"pages":null},"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":null,"pages":null},"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

Shallow transient electromagnetic method application for groundwater exploration: case study from Greece 浅层瞬变电磁法在地下水勘探中的应用:以希腊为例

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073044

M. Sharlov, I. Buddo, Alexander Pisarnitskiy, N. Misurkeeva, I. Shelohov

引用次数: 3

Combining arrival classification and velocity model building using expectation-maximization 结合到达分类和速度模型建立使用期望最大化

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073105

Cericia Martinez, J. Gunning, Juerg Hauser

{"title":"Combining arrival classification and velocity model building using expectation-maximization","authors":"Cericia Martinez, J. Gunning, Juerg Hauser","doi":"10.1080/22020586.2019.12073105","DOIUrl":"https://doi.org/10.1080/22020586.2019.12073105","url":null,"abstract":"Summary Probabilistic inversions of wide angle reflection and refraction data for crustal velocity models are regularly employed to understand the robustness of velocity models that can be inferred from these data. It is well understood that the uncertainties associated with the picks of individual arrivals contribute to overall model uncertainty. Typically only a modicum of effort is devoted to quantifying uncertainty in the traveltime picks; a constant noise estimate is commonly assigned to a given class of arrivals. Further, determining the class of arrivals is often left to the behest of the interpreter, contributing additional uncertainty to the data that is both difficult to quantify and may be altogether incorrect. Given the crucial role data uncertainty plays in characterising model robustness, there is a need to thoroughly and appropriately quantify uncertainty in the traveltime data which itself is inferred from the waveform. Here we propose a method that treats arrival or phase classification as part of the velocity model building (inversion) framework using the well-established expectation-maximization (EM) algorithm.","PeriodicalId":8502,"journal":{"name":"ASEG Extended Abstracts","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2019-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84823794","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

Regional magnetotelluric and potential field data analyses related to mineral exploration of the Fennoscandian Shield, Sweden 瑞典芬诺斯坎地盾矿产勘探的区域大地电磁和势场数据分析

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073184

Roshanak Vadoodi, Thorkild M Rasmussen, Maxim Yu Smirnov

引用次数: 5

Statistical rock physics analysis and modelling in the Browse Basin Browse盆地统计岩石物理分析与建模

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12072947

Shuich Desaki, Yuki Kobayashi, Peter Miklavs

引用次数: 0

New insights into the Exmouth Sub-basin: tectono-stratigraphic evolution 埃克斯茅斯次盆地的新认识:构造-地层演化

ASEG Extended Abstracts Pub Date : 2019-12-01 DOI: 10.1080/22020586.2019.12073004

C. Dempsey, R. Benson, G. O’Halloran, O. Schenk, A. Karvelas, S. Tewari

引用次数: 4