Hydrothermal alteration characteristics of the Chating Cu-Au deposit in Xuancheng City, Anhui Province, China: Significance of sericite alteration for Cu-Au exploration

Yan, Zhaokun; Li, Longming; Yang, Kai; Xing, Guangfu; Xiao, Wenjiao; Zhang, Hongliang; Xiu, Liancun; Zhong-you, Yao; Xie, Zhongliang

doi:10.1016/j.oregeorev.2020.103844

Cited by 18 publications

(4 citation statements)

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“…The pH of the fluid is relatively lower, the sericite is Al-rich, and the Pos2200 value is lower in the channel interior, where high-grade Cu-Au mineralization occurred. Relatively, the pH and Pos2200 values are higher in the channel exterior due to the buffer of surrounding rocks [36]. In the porphyry Cu-Mo deposit of the Highland Valley region, Canada, the sericite with a lower Pos2200 value belongs to light-gray phengitic muscovite that coexists with bornite-chalcopyrite-molybdenite assemblage, suggesting a higher formation temperature and Na-rich composition.…”

Section: Exploration Indicator Of Sericitementioning

confidence: 96%

“…The common spectral MEIs include sericite Al-OH absorption peak (Pos2200) shift and illite crystallization (IC) [1,2,[29][30][31][32][33][34][35][36], chlorite Fe-OH absorption peak (Pos2250) shift [1,4,33,[37][38][39][40], alunite 1480 nm absorption peak (Pos1480) shift [3,41] and REE-bearing mineral absorption features at the bands of 640-870 nm [5][6][7][8]42]. The common chemical MEIs include contents of Ti, Sr, Mn, Pb, and their ratio values in chlorite [4,[43][44][45][46][47], contents of Si, Al, Mn, Zn, and their ratio values in sericite [30,48], contents of As and Sb, and their ratio values in epidote [45,46,49] and contents of K, Na, La, Sr, Pb, and their ratio values in alunite [3,41].…”

Section: Research Advances and Problems Of Meismentioning

confidence: 99%

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Advances on Exploration Indicators of Mineral VNIR-SWIR Spectroscopy and Chemistry: A Review

et al. 2022

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Establishing exploration vectors to infer the properties of ore-forming fluids, locate blind ore bodies with the aid of visible to near-infrared (VNIR) and short-wave infrared (SWIR) spectroscopy, and infer the chemistry of minerals, is a new research interest for economic geology. Common alterations and clay minerals, including sericite, chlorite, epidote, alunite, kaolinite, tourmaline, etc., are ideal objects for the study of exploration indicators due to their sensitivity to variations in the nature of hydrothermal fluid. The diagnostic spectral feature and chemistry vary spatially and systematically with physicochemical change. VNIR spectroscopy can characterize the REE-bearing clay minerals directly. Obtaining spectral or chemical parameters with the aid of VNIR-SWIR spectroscopy, electron probe micro-analyzer (EPMA) or laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS) can help to establish exploration vectors. This paper systematically summarizes recent advances in mineral exploration indicators (MEIs) of VNIR-SWIR spectroscopy and chemistry, and compares them in different regions or deposits. We found that some MEI spatial variation trends are random, even the same type of deposit can show an opposite trend. The controlling factors that limit the application of the established MEIs are vague. Conducting further research on petrology and mineralogy with the aids of observation under microscopy, X-ray diffraction (XRD), TESCAN Integrated Mineral Analyzer (TIMA), and EPMA are suggested to discover alteration mineral assemblage, alteration stages, and behaviors of “the pathfinder elements” related to mineralization. Based on the above research, the physicochemical properties of ore-forming fluids and their control over MEIs can be inferred. Refining the theoretical basis is critical to understanding and popularization of spectral and chemical MEIs.

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Section: Exploration Indicator Of Sericitementioning

confidence: 96%

Section: Research Advances and Problems Of Meismentioning

confidence: 99%

Advances on Exploration Indicators of Mineral VNIR-SWIR Spectroscopy and Chemistry: A Review

et al. 2022

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“…This spectral range includes vibrations of essential absorption characteristics linked to the molecular bonds of OH, H2O, CO3, NH4, AlOH, FeOH, and MgOH [1]. Therefore, it is widely in use for the determination of different mineral groups, including phyllosilicates, hydroxylated silicates and sulfates, carbonates, and ammonium-bearing minerals [2] to create mineral-based alteration maps and models [3][4][5][6][7][8]. Earlier efforts on ore deposits have concentrated on the alteration of minerals as exploration vectors of mineralization since large-scale hydrothermal alteration is typically associated with mineralization [4,9,10].…”

Section: Introductionmentioning

confidence: 99%

Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Aluç

Kuşcu

Moritz

2023

Mugla Journal of Science and Technology

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The Kirazlı mineral district is located at the center of the Biga peninsula metallogenic province, in a geological setting characterized by an extensional tectonic environment. The district hosts a high-sulfidation (HS) ore body with a total reserve of 33.86 Mt @ 0.69 g/t Au and 9.42 g/t Ag within a large-scale hydrothermal alteration. Although the ideal magmatic-hydrothermal models present the spatial and temporal association of HS-epithermal and porphyry Cu deposits, the porphyry Cu potential at the Kirazlı has not been evaluated, yet. Therefore, the mineral-based alteration mapping with the help of SWIR reflectance spectroscopy was carried out. Our study demonstrates that nine different mineral zone have been distinguished and mapped: (1) Silicification, (2) Alunite, (3) Kaolinite, (4) Dickite, (5) Illite, (6) Pyrophyllite, (7) Chlorite, (8) Sericite, and (9) Montmorillonite zones. Collectively, these alterations exhibit a zoned pattern, from central massive silicification to residual silica, NW-SE oriented alunite, and marginal montmorillonite-illite zones within widespread kaolinite – dickite dominated alteration in Kirazlı main zone. The occurrence of pyrophyllite and sericite dominates at the SE of the Kirazlı district, which refers to relative temperature increase. Subsequent drilling confirms the potential for deep prospecting of porphyry Cu mineralization in the region.

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“…Currently, geological research focuses primarily on the geological characteristics of typical deposits, geochronology of ore-bearing intrusions, regional metallogenic regularities, and tectonic evolution history [5][6][7][8][9][10][11][12]. However, research on deep structural frameworks and deep metallogenic backgrounds is relatively limited due to the fact that this area is mostly covered by Mesozoic and Cenozoic strata, with small rock outcrops.…”

Section: Introductionmentioning

confidence: 99%

Deep Structure of Nanling-Xuancheng Ore District, Eastern China: Insights from Integrated Geophysical Exploration

Guo,

Lan,

et al. 2023

Minerals

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As the depth of mineral exploration increases, integrated geophysical methods are increasingly playing a crucial role in prospecting deep structures at the district scale. The Nanling-Xuancheng ore district is the eighth ore district in the middle-lower Yangtze metallogenic belt in China. To reveal the deep structure of the mining district, this study mainly focuses on regional high-precision gravity and magnetic data and integrates the interpretation of magnetotelluric and reflection seismic data from a key area. By using a 2.5D joint inversion method with prior information constraints, new insights into the deep structures, tectonic deformation, and magmatic activity are obtained. Structurally, the Nanling-Xuancheng ore district presents a structural pattern of “two uplifts and two depressions” composed of multi-level thrust-overturned and folds formed by Mesozoic depressions, which has a three-layer structure in the vertical direction (shallower than 10 km). Tectonically, the main faults in the study area trend NW, which intersect with NE-trending and EW-trending faults to form a branching structure from deep to shallow. The fault intersections provide pathways for magma intrusion. The distribution of deep-seated concealed magmatic rocks shows the characteristic pattern of “a primary magma source spawning multiple subsidiary intrusion”.

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Hydrothermal alteration characteristics of the Chating Cu-Au deposit in Xuancheng City, Anhui Province, China: Significance of sericite alteration for Cu-Au exploration

Cited by 18 publications

References 25 publications

Advances on Exploration Indicators of Mineral VNIR-SWIR Spectroscopy and Chemistry: A Review

Advances on Exploration Indicators of Mineral VNIR-SWIR Spectroscopy and Chemistry: A Review

Identifying Potential Porphyry Cu Mineralization at the Kirazli District in Biga Peninsula (Nw Turkey): Insights From the Mapping Hydrothermal Alteration by Using Shortwave Infrared (Swir) Spectrometry

Deep Structure of Nanling-Xuancheng Ore District, Eastern China: Insights from Integrated Geophysical Exploration

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