scholarly journals Identifying Geochemical Anomalies Associated with Gold Mineralization Using Factor Analysis and Spectrum–Area Multifractal Model in Laowan District, Qinling-Dabie Metallogenic Belt, Central China

Minerals ◽  
2020 ◽  
Vol 10 (3) ◽  
pp. 229
Author(s):  
Ruoyu Wu ◽  
Jianli Chen ◽  
Jiangnan Zhao ◽  
Jinduo Chen ◽  
Shouyu Chen
Keyword(s):  
Factor Analysis ◽  
Gold Mineralization ◽  
Fractal Model ◽  
Central China ◽  
Geochemical Data ◽  
Geochemical Anomalies ◽  
Theoretical Support ◽  
Metallogenic Belt ◽  
Spectrum Area ◽  
Anomaly Map

The Laowan deposit is a typical gold deposit in the Qinling-Dabie metallogenic belt, which produces the most gold resources in Central China. After being explored for decades, follow-up exploration requires additional theoretical support. In this study, the factor analysis (FA) and spectrum–area (S–A) multifractal model were used to process multi-element geochemical data from 369 samples collected in the study area for identifying the geochemical anomalies associated with gold mineralization. The results showed that: (1) the mean Au content in this region is up to 1000 times higher than the Au background values of the upper crust of the South Qinling unit; (2) the factor analysis revealed that Au, Ag, Cu, As, Sb, and S can be used as direct ore-prospecting criteria; (3) the observed elemental zonation is consistent with the zonation of metallic elements in the magmatic–hydrothermal system. This supports the magmatic–hydrothermal origin of the Laowan deposit; (4) the spectrum–area fractal model can help to decompose the geochemical patterns in a complex geological setting. The decomposed geochemical anomaly map obtained by the S–A multifractal model indicated that highly anomalous areas have a great relationship with the Au occurrence and can be a guidance for further exploration in the study area.

Application of spectrum–area fractal model to identify of geochemical anomalies based on soil data in Kahang porphyry-type Cu deposit, Iran

Geochemistry ◽  
2013 ◽  
Vol 73 (4) ◽  
pp. 533-543 ◽  
Author(s):  
Peyman Afzal ◽  
Hamid Harati ◽  
Younes Fadakar Alghalandis ◽  
Amir Bijan Yasrebi
Keyword(s):  
Fractal Model ◽  
Geochemical Anomalies ◽  
Spectrum Area

Application of C-N fractal model, factor analysis, and geochemical mineralization probability index (GMPI) for delineating geochemical anomalies related to Mn-Fe deposit and associated Cu mineralization in west-central Sinai, Egypt

2021 ◽  
pp. geochem2021-031
Author(s):  
Hossam A. Helba ◽  
Ahmed M. El-Makky ◽  
Khalil I. Khalil
Keyword(s):  
Factor Analysis ◽  
Spatial Distribution ◽  
Country Rock ◽  
Fractal Model ◽  
Geochemical Anomaly ◽  
Rock Composition ◽  
Geochemical Anomalies ◽  
West Central ◽  
Supplementary Material ◽  
Probability Index

The west-central Sinai area includes one of the most productive manganese deposits in Egypt (Um Bogma Mn-Fe ore). The explored area is covered by a Carboniferous and Cambro-Ordovician sedimentary succession overlying Precambrian basement rocks. The purpose of this study is to delineate geochemical anomalies of ore and related elements and track their dispersion trains, which may lead to discovery of unknown ore deposits. For this purpose, 143 stream sediment samples were analyzed and the data were interpreted using the concentration-number (C-N) fractal model, factor analysis, and the geochemical mineralization probability index. Geochemical thresholds obtained from the C-N fractal model, factor scores, and GMPI were used for constructing geochemical anomaly maps and delineating probable anomalous sites. The spatial distribution of Mn, Cu, Co, Pb, and Zn anomalies was correlated to Mn and Cu mineralization sites whereas those of Fe and Cr were consistent with mafic rock distributions. Factor analysis revealed significant element associations for mineralization (Cu, Co, Mn, Zn, Pb), country rock composition (Fe, Cr), and element mobility (Cd, Zn). The spatial distribution of ore elements (Mn, Cu) delineated by the factor score and GMPI distribution maps was confirmed and more accurately interpreted using geochemical anomaly maps constructed based on the fractal-derived thresholds. Based on the current study, recent Cu and Mn mineralization sites may be suggested. Cobalt, Zn, Pb, and Cd are suggested as efficient pathfinder elements for marine Mn deposits. A dispersion sequence of Cd>Mn>Co>Pb>Zn>Cu>Cr>Fe was proposed based on the threshold distribution patterns of these elements.Supplementary material:https://doi.org/10.6084/m9.figshare.c.5463511

scholarly journals Geology and Geochemistry of Selected Gold Deposits in the Ailaoshan Metallogenic Belt, China: Origin of Ore-Forming Fluids

Minerals ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1276
Author(s):  
Yang Li ◽  
Denghong Wang ◽  
Chenghui Wang ◽  
Yan Sun ◽  
MIMA Pu-chi
Keyword(s):  
Host Rock ◽  
Large Scale ◽  
Gold Mineralization ◽  
Mining Area ◽  
Gold Deposits ◽  
Pb Isotopes ◽  
Late Triassic ◽  
Geochemical Data ◽  
Continental Scale ◽  
Metallogenic Belt

The formation of the Ailaoshan metallogenic belt was the result of: the Neoproterozoic super mantle plume, the Indosinian and South China blocks in the Late Triassic after the Paleo-Tethys Ocean closure, and Oligocene-Eocene continental-scale shearing related to the India-Eurasia collision. It is one of the most important Cenozoic gold ore province in the world. In this paper, the geological characteristics, isotopic geochemistry, and geochemical data of ore-forming fluids of four large-scale gold deposits in the Ailaoshan metallogenic belt (Mojiang Jinchang, Zhenyuan Laowangzhai, Yuanyang Daping, and Jinping Chang’an) are comprehensively compared. The features of host-rock alteration, metallogenetic periods and stages, geochronology, fluid inclusion, and C-H-O-S-Pb isotopes of gold deposits are summarized and analyzed. The gold mineralization in the Ailaoshan metallogenic belt occurred mostly in 50–30 Ma, belonging to the Himalayan period. The gold mineralization is closely related to silicification, argillation, carbonation, and pyritization due to the strong mineralization of hydrothermal fluid, the development of alteration products, and the inconspicuous spatial zonation of alteration types. The ore-forming fluid is mainly composed of mantle fluid (magmatic water) and metamorphic fluid (metamorphic water). The ore-forming materials of the Jinchang, Chang’an, and Laowangzhai gold deposits mainly originate the host-rock strata of the mining area, and the carbon is more likely to from marine carbonate. The carbon in the Daping gold deposit from the original magma formed by the partial melting of the mantle. Pb isotopes have characteristics of crustal origin, accompanied by mixing of mantle-derived materials and multisource sulfur mixing, and are strongly homogenized.

scholarly journals Re–Os Pyrite Geochronological Evidence of Three Mineralization Styles within the Jinchang Gold Deposit, Yanji–Dongning Metallogenic Belt, Northeast China

Minerals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 448 ◽  
Author(s):  
Shun-Da Li ◽  
Zhi-Gao Wang ◽  
Ke-Yong Wang ◽  
Wen-Yan Cai ◽  
Da-Wei Peng ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Northeast China ◽  
Gold Mineralization ◽  
Metallogenic Belt ◽  
Isotopic Analyses ◽  
Mantle Sources ◽  
Stage 1 ◽  
Geochronological Evidence ◽  
Gold Bearing

The Jinchang gold deposit is located in the eastern Yanji–Dongning Metallogenic Belt in Northeast China. The orebodies of the deposit are hosted within granite, diorite, and granodiorite, and are associated with gold-mineralized breccia pipes, disseminated gold in ores, and fault-controlled gold-bearing veins. Three paragenetic stages were identified: (1) early quartz–pyrite–arsenopyrite (stage 1); (2) quartz–pyrite–chalcopyrite (stage 2); and (3) late quartz–pyrite–galena–sphalerite (stage 3). Gold is hosted predominantly within pyrite. Pyrite separated from quartz–pyrite–arsenopyrite cement within the breccia-hosted ores (Py1) yield a Re–Os isochron age of 102.9 ± 2.7 Ma (MSWD = 0.17). Pyrite crystals from the quartz–pyrite–chalcopyrite veinlets (Py2) yield a Re–Os isochron age of 102.0 ± 3.4 Ma (MSWD = 0.2). Pyrite separated from quartz–pyrite–galena–sphalerite veins (Py3) yield a Re–Os isochron age of 100.9 ± 3.1 Ma (MSWD = 0.019). Re–Os isotopic analyses of the three types of auriferous pyrite suggest that gold mineralization in the Jinchang Deposit occurred at 105.6–97.8 Ma (includes uncertainty). The initial 187Os/188Os values of the pyrites range between 0.04 and 0.60, suggesting that Os in the pyrite crystals was derived from both crust and mantle sources.

Supergene ore and hypogene sub-economic gold mineralization at Shewushan, Hubei, central China

2000 ◽  
Vol 109 (3) ◽  
pp. 196-198 ◽  
Author(s):  
Hong Hanlie ◽  
Bian Qiujuan ◽  
Wang Qinyan
Keyword(s):  
Gold Mineralization ◽  
Central China

Mineral Exploration using CSAMT data: Application to Longmen region metallogenic belt, Guangdong Province, China

Geophysics ◽  
2013 ◽  
Vol 78 (3) ◽  
pp. B111-B119 ◽  
Author(s):  
Xiangyun Hu ◽  
Ronghua Peng ◽  
Guiju Wu ◽  
Weiping Wang ◽  
Guangpu Huo ◽  
...  
Keyword(s):  
Large Scale ◽  
Southern China ◽  
Mineral Exploration ◽  
Geochemical Data ◽  
Data Application ◽  
Metallogenic Belt ◽  
Fe Content ◽  
Geophysical Surveys ◽  
Occam’S Inversion ◽  
Integrated Interpretation

A controlled-source audio-frequency magnetotelluric (CSAMT) survey has been carried out to investigate potential iron (Fe) and polymetallic (Pb-Zn-Cu) deposits in Longmen region, which is one of the main metallogenic belts in southern China. Conducting geophysical surveys in this area is quite difficult due to mountainous terrain, dense forest, and thick vegetation cover. A total of 560 CSAMT soundings were recorded along twelve surveying lines. Two-dimensional Occam’s inversion scheme was used to interpret these CSAMT data. The resulting electric resistivity models showed that three large-scale highly conductive bodies exist within the surveying area. By integrated interpretation combined with available geologic, geophysical, and geochemical data in this area, three prospective mineral deposits were demarcated. Based on the CSAMT results, a borehole penetrating approximately 250-m depth was drilled at the location of 470 m to the northwest end of line 06, defined with a massive pyrite from the depth of 52–235 m with 7%–16% Fe content, as well as locally high-grade Pb-Zn- and Ag-Ti-bearing ores.

The Age of Gold Mineralization in the Yana–Kolyma Metallogenic Belt, Northeastern Russia: First Data of Re–Os Isotope Geochronology of Native Gold

2021 ◽  
Vol 15 (4) ◽  
pp. 293-306
Author(s):  
V. Yu. Fridovsky ◽  
N. A. Goryachev ◽  
R. Sh. Krymsky ◽  
M. V. Kudrin ◽  
B. V. Belyatsky ◽  
...  
Keyword(s):  
Native Gold ◽  
Gold Mineralization ◽  
Northeastern Russia ◽  
Isotope Geochronology ◽  
Metallogenic Belt ◽  
Os Isotope

Examining the influences of perceived exclusivity and perceived rarity on consumers' perception of luxury

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Xujia Wang ◽  
Billy Sung ◽  
Ian Phau
Keyword(s):  
Factor Analysis ◽  
Confirmatory Factor Analysis ◽  
Design Methodology ◽  
Marketing Strategies ◽  
Content Type ◽  
Product Categories ◽  
Theoretical Support ◽  
Confirmatory Factor ◽  
Luxury Market ◽  
Practical Implications

PurposeThe purpose of this study is to investigate how exclusivity and rarity (natural versus virtual) influence consumers' perceptions of luxury. Further, it examines whether exclusivity and rarity can function as distinct marketing strategies in today's luxury market environment.Design/methodology/approachOnline questionnaires were administered by adapting developed scales from prior research. Research stimuli were chosen from three luxury categories including bags, wine and cruise. Confirmatory factor analysis and multiple regressions were used to test the hypotheses.FindingsThe results confirmed that exclusivity, natural rarity and virtual rarity were perceived as relatively distinct constructs among our sample. Findings also highlighted that perceived natural rarity (PNR) has consistently emerged as a positive and significant contributor to consumers' perceptions of luxury across all three luxury categories. The influence of perceived exclusivity (PE) on perceptions of luxury has also shown to be significant for two product categories (luxury bag and luxury wine), whereas perceived virtual rarity (PVR) did not show any significant effects across all three categories.Practical implicationsThe results indicate that consumers perceive natural rarity, virtual rarity and exclusivity as relatively distinctive marketing strategies. This suggests that luxury businesses can adopt each strategy independently to achieve desired marketing outcomes.Originality/valueThis study offers theoretical support for the proposition that exclusivity and rarity may have different functions in luxury marketing implementations. It provides empirical evidence showing the distinctiveness of perceived exclusivity and perceived rarity, which have not be done in previous research.

Geology of the Liese Zone, Pogo Property, East-Central Alaska

SEG Discovery ◽  
1999 ◽  
pp. 1-21
Author(s):  
MOIRA SMITH ◽  
JOHN F.H. THOMPSON ◽  
JASON BRESSLER ◽  
PAUL LAYER ◽  
JAMES K. MORTENSEN ◽  
...  
Keyword(s):  
Gold Deposit ◽  
Gold Mineralization ◽  
Geochemical Data ◽  
East Central ◽  
Gold Silver ◽  
Ore Minerals ◽  
Middle Paleozoic ◽  
Deposit Type ◽  
Alteration Minerals ◽  
Native Bismuth

ABSTRACT The Liese zone is a recently discovered high-grade gold deposit on the Pogo claims, approximately 90 miles (145 km) southeast of Fairbanks. A conservative geologic resource for the Liese zone is 9.98 million tons at an average grade of 0.52 oz/t, for a total of 5.2 million contained ounces. The region is underlain by highly deformed, amphibolite-grade paragneiss and minor orthogneiss of the Late Proterozoic(?) to middle Paleozoic Yukon-Tanana terrane, which has been intruded by Cretaceous felsic granitoid bodies thought to be related to gold mineralization in the Fairbanks area and elsewhere along the Tintina gold belt. The Liese zone is hosted primarily in gneiss, and lies approximately 1.5 km south of the southern margin of the Late Cretaceous Goodpaster batholith. Mineralization occurs in three or more tabular, gently dipping quartz bodies, designated L1 (uppermost), L2, and L3 (lowermost). The thickness of the quartz bodies ranges from 1 to 20 m, averaging approximately 7 m. The quartz contains approximately 3 percent ore minerals, including pyrite, pyrrhotite, loellingite, arsenopyrite, chalcopyrite, bismuthinite, various Ag-Pb-Bi ± S minerals, maldonite, native bismuth, and native gold. Early biotite and later quartz-sericite-stockwork and sericite-dolomite alteration are spatially associated with the Liese zone, which shows characteristics of both vein and replacement styles of mineralization. Geochemical data indicate a strong correlation between gold and bismuth, and weaker correlations between gold, silver, and arsenic. Based on U-Pb dating of intrusive rocks, the Liese zone was formed between 107 and 94.5 m.y. ago, although 40Ar/39Ar cooling ages on alteration minerals return younger ages of 91 Ma, suggesting a protracted or multiphase thermal history. The Liese zone may represent a deep-seated manifestation of the "intrusion-related" gold deposit type.

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