检索结果-南通市图书馆

Cu-Zn isotope compositions of hydrothermal sediments from the southern Mid-Atlantic Ridge:implications to the sediment formation and mineral exploration

引用

Journal of Oceanology and Limnology 2024年第5期42卷 1470-1485页

作者： Baoju YANG Lianhua HE Chuanshun LI Qiannan HU Bingfu JIN Jihua LIU School of Resources and Environmental Engineering Ludong UniversityYantai 264025China Key Laboratory of Marine Geology and Metallogeny First Institute of OceanographyMinistry of Natural ResourcesQingdao 266061China College of Earth Science and Engineering Shandong University of Science and TechnologyQingdao 266590China

Six hydrothermal sediment samples were collected from the Xunmei and Tongguan hydrothermal fields along the southern Mid-Atlantic Ridge during the China Ocean Cruise DY46 in *** and oxides in the samples were separated,and Cu and Zn isotope compositions were *** show that the ranges ofδ^(65)Cu values of the bulk sediments,sulfides,and oxides were 0.36‰-2.46‰,-0.21‰-1.10‰,and 0.68‰-1.52‰,***δ^(65)Cu values of sulfides in four samples(46II-14,46II-30,46III-06,and 46II-09)were relatively low(-0.21‰-0.50‰),corresponding to theδ^(65)Cu values of sulfides from inactive old hydrothermal chimneys in northern Mid-Atlantic Ridge(n MAR),suggesting that the sulfides in the sediments were originated from collapsed dead chimney *** theδ^(65)Cu values of the other two samples(46III-02 and 46III-08)were relatively high(1.10‰-0.96‰),corresponding to theδ^(65)Cu values for active hydrothermal chimneys sulfides in n MAR,which indicated that the sulfides in these two samples might mainly come from sulfide particles settled from active hydrothermal *** of the high density of sulfide particles,they tended to settle near the hydrothermal vents ***,highδ^(65)Cu values of sulfides in 46III-02 and 46III-08 implied that undiscovered active hydrothermal vents near the sampling positions of 46III-02 in the Xunmei hydrothermal field and 46III-08 in the Tongguan hydrothermal ***δ^(66)Zn values of hydrothermal sediments and sulfides ranged 0.11‰-0.43‰and 0.29‰-0.67‰,*** the four samples from the Xunmei hydrothermal field,a positive correlation was found between the distance of the sampling position from sulfide mineralized spot and the Zn isotopic ratio,showing that the greater the distance from the mineralized spot,the heavier the Zn isotope composition as seen in two samples(46II-30 and 46II-14)of the Xunmei-3 *** result aligned with the findings of Wilkinson et al.(2005)and Baumgartner et al.(2023),sugges

关键词： Cu-Zn isotope hydrothermal sediments mineral exploration southern Mid-Atlantic Ridge

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Metallogenic‘factories’and resultant highly anomalous mineral endowment on the craton margins of China

引用

Geoscience Frontiers 2022年第2期13卷 1-20页

作者： Li-Qiang Yang Jun Deng David I.Groves M.Santosh Wen-Yan He Nan Li Liang Zhang Rui-Rui Zhang Hong-Rui Zhang State Key Laboratory of Geological Processes and mineral Resources China University of GeosciencesBeijing 100083China Ministry of Natural Resources Key Laboratory of Gold mineralization Processes and Resources Utilization Shandong Institute of Geological SciencesJinan 250013China Centre for exploration Targeting University of Western AustraliaCrawleyWA 6009Australia Dept.of Earth Sciences University of AdelaideSA 5005Australia Division of Interdisciplinary Science Faculty of ScienceKochi UniversityKochi 780-8520Japan

The current margins of the North China and Yangtze Cratons provide arguably the best examples globally of anomalously high mineral endowment within a 100 km buffer zone,hosting 66 diverse world-class to giant ore systems that help explain China’s premier position as a producer of multiple metal and mineral *** the cratonization of these crustal blocks during the Neoarchean-Paleoproterozoic,with incorporation of iron ores on assembled micro-block margins,the margins of the cratons experienced multiple convergence and rifting events leading to metasomatism and fertilization of their underlying sub-continental lithospheric *** rifted margins with trans-lithosphere faults provided pathways for Cu-Au(Mo-W-Sn)-bearing felsic to Ni-Cu-bearing ultrabasic intrusions and REE-rich carbonatite magmas,and for the development of marginal sedimentary basins with both Cu-Pb-Zn-rich source units and reactive carbonate or carbonaceous host *** was diachronous formation of hydrothermal orogenic gold,antimony,and bismuth systems in the narrow orogenic belts between the *** in the Mesozoic Paleo-Pacific subduction systems resulted in asthenosphere upwelling and lithosphere extension and thinning in the North China Craton,leading to anomalous heat flow and formation of orogenic gold deposits,including those of the giant Jiaodong gold province on its north-eastern *** gold deposits,many of which formed from fluids liberated by devolatilization of previously metasomatized sub-continental lithospheric mantle,helped propel China to be the premier gold producer *** thick sub-continental lithospheric mantle of the cold buoyant cratons helped the preservation of some of the world’s oldest porphyry-skarn and epithermal mineral *** craton margins globally control the formation and preservation of a diverse range of mineral deposits,China represents the premier example in terms of metal endowment due to the anomalous length

关键词： Craton margin Ore deposits Geodynamic setting Fertile mantle lithosphere mineral exploration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Mapping alteration minerals using sub-pixel unmixing of ASTER data in the Sarduiyeh area,SE Kerman,Iran

引用

International Journal of Digital Earth 2011年第6期4卷 487-504页

作者： Mahdieh Hosseinjani Majid H.Tangestani Department of Earth Sciences Faculty of SciencesShiraz University71454 ShirazIran

This paper is an attempt to introduce the role of earth observation technology and a type of digital earth processing in mineral resources exploration and *** sub-pixel distribution and quantity of alteration minerals were mapped using linear spectral unmixing(LSU)and mixture tuned matched filtering(MTMF)algorithms in the Sarduiyeh area,SE Kerman,Iran,using the visible-near infrared(VNIR)and short wave infrared(SWIR)bands of the Advanced Spaceborne Thermal Emission and Reflection Radiometer(ASTER)instrument and the results were compared to evaluate the efficiency of *** groups of alteration minerals were identified:(1)pyrophylite-alunite(2)sericite-kaolinite,and(3)*** showed that high abundances within pixels were successfully corresponded to the alteration *** addition,a number of unreported altered areas were *** observations and X-ray diffraction(XRD)analysis of field samples confirmed the dominant mineral phases identified *** of LSU and MTMF were generally similar with overall accuracy of 82.9 and 90.24%,*** is concluded that LSU and MTMF are suitable for sub-pixel mapping of alteration minerals and when the purpose is identification of particular targets,rather than all the elements in the scene,the MTMF algorithm could be proposed.

关键词： remote sensing image processing linear spectral unmixing(LSU) mixture tuned matched filtering(MTMF) ASTER digital earth geology mineral exploration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Bayesian geological and geophysical data fusion for the construction and uncertainty quantification of 3D geological models

引用

Geoscience Frontiers 2021年第1期12卷 479-493页

作者： Hugo K.H.Olierook Richard Scalzo David Kohn Rohitash Chandra Ehsan Farahbakhsh Chris Clark Steven M.Reddy R.Dietmar Müller School of Earth and Planetary Sciences Curtin UniversityGPO Box U1987PerthWA6845Australia Centre for Translational Data Science University of SydneyNSW2006SydneyAustralia Sydney Informatics Hub University of SydneyNSW2006SydneyAustralia EarthByte Group School of GeosciencesUniversity of SydneyNSW2006SydneyAustralia Timescales of mineral Systems and John de Laeter Centre Curtin UniversityGPO Box U1987PerthWA6845Australia School of Mathematics and Statistics University of New South WalesSydneyNSW2052Australia Department of Mining Engineering Amirkabir University of Technology(Tehran Polytechnic)TehranIran

Traditional approaches to develop 3D geological models employ a mix of quantitative and qualitative scientific techniques,which do not fully provide quantification of uncertainty in the constructed models and fail to optimally weight geological field observations against constraints from geophysical ***,using the Bayesian Obsidian software package,we develop a methodology to fuse lithostratigraphic field observations with aeromagnetic and gravity data to build a 3D model in a small(13.5 km×13.5 km)region of the Gascoyne Province,Western *** approach is validated by comparing 3D model results to independently-constrained geological maps and cross-sections produced by the Geological Survey of Western *** fusing geological field data with aeromagnetic and gravity surveys,we show that 89%of the modelled region has>95%certainty for a particular geological unit for the given model and *** boundaries between geological units are characterized by narrow regions withmineral exploration and the development of 3D geological models under cover.

关键词： Capricorn orogen Machine learning Bayesian inference Markov chain Monte Carlo Solid earth mineral exploration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Application of cluster analysis to geochemical compositional data for identifying ore-related geochemical anomalies

引用

Frontiers of Earth Science 2018年第3期12卷 491-505页

作者： Shuguang ZHOU Kefa ZHOU Jinlin WANG Genfang YANG Shanshan WANG Xinjiang Institute of Ecology and Geography Chinese Academy of Sciences Urumqi 830011 China Xinjiang Laboratory of mineral Resources and Digital Geology Ummqi 830011 China Laboratory of Desert Environment & Engineering Ummqi 830011 China

Cluster analysis is a well-known technique that is used to analyze various types of data. In this study, cluster analysis is applied to geochemical data that describe 1444 stream sediment samples collected in northwestern Xinjiang with a sample spacing of approximately 2 km. Three algorithms （the hierarchical, k-means, and fuzzy cmeans algorithms） and six data transformation methods （the z-score standardization, ZST; the logarithmic transformation, LT; the additive log-ratio transformation, ALT; the centered log-ratio transformation, CLT; the isometric log-ratio transformation, ILT; and no transformation, NT） are compared in terms of their effects on the cluster analysis of the geochemical compositional data. The study shows that, on the one hand, the ZST does not affect the results of columnor variable-based （R-type） cluster analysis, whereas the other methods, including the LT, the ALT, and the CLT, have substantial effects on the results. On the other hand, the results of the row- or observation-based （Q-type） cluster analysis obtained from the geochemical data after applying NT and the ZST are relatively poor. However, we derive some improved results from the geochemical data after applying the CLT, the ILT, the LT, and the ALT. Moreover, the k-means and fuzzy cmeans clustering algorithms are more reliable than the hierarchical algorithm when they are used to cluster the geochemical data. We apply cluster analysis to the geochemical data to explore for Au deposits within the study area, and we obtain a good correlation between the results retrieved by combining the CLT or the ILT with the k-means or fuzzy c-means algorithms and the potential zones of Au mineralization. Therefore, we suggest that the combination of the CLT or the ILT with the k-means or fuzzy c-means algorithms is an effective tool to identify potential zones of mineralization from geochemical data.

关键词： cluster analysis compositional data geochemical anomaly mineral exploration

来源：

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Monte Carlo-based framework for risk-return analysis in mineral prospectivity mapping

引用

Geoscience Frontiers 2020年第6期11卷 2297-2308页

作者： Ziye Wang Zhen Yin Jef Caers Renguang Zuo State Key Laboratory of Geological Processes and mineral Resources China University of GeosciencesWuhan 430074China Department of Geological Sciences Stanford UniversityCalifornia94305USA

Quantification of a mineral prospectivity mapping(MPM)heavily relies on geological,geophysical and geochemical analysis,which combines various evidence layers into a single ***,MPM is subject to considerable uncertainty due to lack of understanding of the metallogenesis and limited spatial data *** this paper,we provide a framework that addresses how uncertainty in the evidence layers can be quantified and how such uncertainty is propagated to the prediction of mineral *** specifically,we use Monte Carlo simulation to jointly quantify uncertainties on all uncertain evidence variables,categorized into geological,geochemical and *** stochastically simulated sets of the multiple input layers,logistic regression is employed to produce different quantifications of the mineral potential in terms of *** we address lie in the downscaling of magnetic data to a scale that makes such data comparable with known mineral ***,we deal with the limited spatial sampling of geochemistry that leads to spatial ***,we deal with the conceptual geological uncertainty related to how the spatial extent of the influence of evidential geological features such as faults,granite intrusions and sedimentary ***,we provide a novel way to interpret the established uncertainty in a risk-return analysis to decide areas with high potential but at the same time low uncertainty on that *** methods are illustrated and compared with traditional deterministic MPM on a real case study of prospecting skarn Fe deposition in southwestern Fujian,China.

关键词： Uncertainty quantification Geostatistics mineral exploration Risk vs return

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

ASTER Analysis for Locating REE-Bearing Granites in Arid Regions:Example from the Arabian Shield

引用

Journal of Earth Science 2022年第5期33卷 1114-1123页

作者： Reda Amer Timothy M.Kusky Department of Earth and Space Sciences Lamar UniversityBeaumontTX77710USA State Key Laboratory of Geological Processes and mineral Resources Center for Global TectonicsSchool of Earth SciencesBadong National Observatory and Research Station for GeohazardsChina University of GeosciencesWuhan430074China

The world’s increasing demand for rare earth elements(REEs)highlights the potential for using new multispectral remote sensing techniques to define new exploration targets in arid regions,such as the Kingdom of Saudi Arabia(KSA),Egypt,and regions of central and western *** REEs cannot be detected by satellite multispectral instruments,REEs-bearing alkaline granites can be identified on ASTER ***,we develop a new ASTER band ratio scheme to delineate mineralization-related features of the Ghurayyah REE-bearing peralkaline granite in the northwestern *** Ghurayyah peralkaline stock is located at the intersection of a NW striking segment of the Najd-fault system,and an E-W striking *** is surrounded to the north and west by metavolcanics,from east by the Jabal Dabbagh alkali granite,and from the south by *** mineralogical composition of granitic rocks resulted in spectral variation and causes absorption features at different wavelengths in the shortwave infrared(SWIR).The newly developed band ratios were constructed from(b6+b8)/(b6–b8)in red;(b6+b8)/b4 in green,and(b7–b9)/(b7+b9)in blue,enabling the discrimination between the Ghurayyah REE-bearing peralkaline granite,Jabal Dabbagh alkali granite,monzogranite,and *** work will be carried out to perform higher-resolution drone-based hyperspectral imaging for new high-resolution mapping and evaluate the existing REE deposits,emphasizing field spectral measurements to identify the spectral reflectance of REEs mineralized zones and the absorption features of monazite,columbite-tantalite,and aeschynite-(Y),coupled with rock sampling for petrographical,spectral,and geochemical *** methods have great potential for locating REEs-bearing peralkaline granites in the Arabian shield and elsewhere,such as arid portions of central and western China and adjacent regions.

关键词： remote sensing multispectral imaging rare earth elements Arabian Shield mineral exploration

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

A machine learning approach to tungsten prospectivity modelling using knowledge-driven feature extraction and model confidenc

引用

Geoscience Frontiers 2020年第6期11卷 2067-2081页

作者： Christopher M.Yeomans Robin K.Shail Stephen Grebby Vesa Nykanen Maarit Middleton Paul A.J.Lusty Camborne School of Mines College of EngineeringMathematics and Physical SciencesUniversity of ExeterPenryn CampusPenrynCornwallTR109FEUK British Geological Survey Environmental Science CentreKeyworthNottinghamshireNG125GGUK University of Nottingham Nottingham Geospatial InstituteInnovation ParkNottinghamNG72TUUK Geological Survey of Finland P.O.Box 77FI-96101RovaniemiFinland

Novel mineral prospectivity modelling presented here applies knowledge-driven feature extraction to a datadriven machine learning approach for tungsten *** method emphasises the importance of appropriate model evaluation and develops a new Confidence Metric to generate spatially refined and robust exploration *** data-driven Random ForestTM algorithm is employed to model tungsten mineralisation in SW England using a range of geological,geochemical and geophysical evidence layers which include a depth to granite evidence *** models are presented,one using standardised input variables and a second that implements fuzzy set theory as part of an augmented feature extraction *** use of fuzzy data transformations mean feature extraction can incorporate some user-knowledge about the mineralisation into the *** typically subjective approach is guided using the Receiver Operating Characteristics(ROC)curve tool where transformed data are compared to known training *** modelling is conducted using 34 known true positive samples with 10 sets of randomly generated true negative samples to test the random effect on the *** two models have similar accuracy but show different spatial distributions when identifying highly prospective *** analysis shows that the fuzzy-transformed model is a better discriminator and highlights three areas of high prospectivity that were not previously *** Confidence Metric,derived from model variance,is employed to further evaluate the *** new metric is useful for refining exploration targets and highlighting the most robust areas for follow-up *** fuzzy-transformed model is shown to contain larger areas of high model confidence compared to the model using standardised ***,legacy mining data,from drilling reports and mine descriptions,is used to further validate the fuzzy-transformed model and gauge the depth of potential *** of m

关键词： Machine learning mineral prospectivity modelling mineral exploration Random ForestTM Tungsten SW England

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Imaging the Architecture of mineral Systems and the Pathways of Ore-forming Fluids across Mongolia with Magnetotellurics

引用

Acta Geologica Sinica(English Edition) 2024年第S01期98卷 11-13页

作者： Matthew J.COMEAU Rafael RIGAUD Erdenechimeg BATMAGNAI Shoovdor TSERENDUG Sodnomsambuu DEMBEREL Michael BECKEN Alexey KUVSHINOV Department of Geoscience&Engineering Delft University of Technology The Netherlands Institute of Geophysics ETHZürichSwitzerland Institute of Astronomy and Geophysics Mongolian Academy of SciencesUlaanbaatarMongolia Institut für Geophysik Universität MünsterGermany

In the framework of a mineral system approach,a combination of components is required to develop a mineral *** includes the whole-lithosphere architecture,which controls the transport of ore-forming fluids,and favorable tectonic and geodynamic processes,occurring at various spatial and temporal scales,that influence the genesis and evolution of ore-forming fluids(Huston et al.,2016;Groves et al.,2018;Davies et al.,2020).Knowledge of the deep structural framework can advance the understanding of the development of a mineral system and the emplacement of mineral *** geophysical exploration carried out with this aim is increasingly important for targeting new ore deposits in unexplored and underexplored regions(Dentith et al.,2018;Dentith,2019).

关键词： magnetotellurics electrical resistivity mineral exploration mineral emplacement ore fluids fluid transport

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Investigating the Whole-lithosphere Structure of a mineral System——Pathways and Source of Ore-forming Fluids Imaged with Magnetotelluric Modeling

引用

Acta Geologica Sinica(English Edition) 2021年第S01期95卷 73-75页

作者： Matthew J.COMEAU Michael BECKEN Alexey V.KUVSHINOV Sodnomsambuu DEMBEREL Erdenechimeg BATMAGNAI Shoovdor TSERENDUG Institut für Geophysik Universitat MünsterGermany Institute of Geophysics ETHZürichSwitzerland Institute of Astronomy and Geophysics Mongolian Academy of SciencesUlaanbaatarMongolia

Whole-lithosphere structure has direct implications for both the genesis of minerals and the locations of mineral emplacement;thus knowledge of the deep structural framework of the lithosphere can advance understandin... 详细信息

关键词： magnetotellurics electrical resistivity lithosphere structure mineral exploration metal belt oreforming fluids mineral emplacement fluid transport

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：