Significance of native arsenic in the Baogutu gold deposit, western Junggar, Xinjiang, NW China

An, Fang; Zhu, Yongfeng

doi:10.1007/s11434-009-0086-6

Cited by 18 publications

(5 citation statements)

References 15 publications

(13 reference statements)

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“…4). The mineral assemblage formed in this deposit is native Asenative gold/electrumestibnite at 230e270 C, log f(O 2 ) is À42 to À56.5 with log f(S 2 ) of À13.3 to À16.6 (An and Zhu, 2009). …”

Section: The Geochemical Behavior Of Gold In Hydrothermal Systemsmentioning

confidence: 88%

Geochemistry of hydrothermal gold deposits: A review

Zhu

Tan

2011

Geoscience Frontiers

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133

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Mineral assemblages formed during hydrothermal alteration reflect the geochemical composition of ore-forming fluids. Gold is mainly transported in solution as AueCl and AueS complexes. The change of physicochemical conditions such as temperature, pressure, oxygen fugacity, and sulfur fugacity are effective mechanisms for gold precipitation. Gold tends to be concentrated in the vapor phase of fluids at high temperatures and pressures. AueAs and AueSb associations are common in gold deposit. Native antimony and/or arsenic e native gold assemblages may precipitate from hydrothermal fluids with low sulfur fugacity. Hydrothermal fluids forming epithermal gold deposits are Au-saturated in most cases, whereas fluids of Carlin-type are Au-undersaturated. Quasi-steady As-bearing pyrite extracts solid solution Au from hydrothermal fluids through absorption. The capability of As-bearing pyrite to absorb Au from under-saturated fluid is the key to the formation of large-scale Carlin-type deposits. With increasing new data, studies on the geochemistry of gold deposits can be used to trace the origin of ore-forming fluids, the source of gold, and the transporting form of Au and other ore-forming elements, such as Si, S, F, Cl, As and Ag. ª 2011, China University of Geosciences (Beijing) and Peking University. Production and hosting by Elsevier B.V. All rights reserved.

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Section: The Geochemical Behavior Of Gold In Hydrothermal Systemsmentioning

confidence: 88%

Geochemistry of hydrothermal gold deposits: A review

Zhu

Tan

2011

Geoscience Frontiers

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133

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“…The strata mainly consist of Carboniferous and Devonian andesitic basalt, andesite, felsic tuff and tuffite in the southern West Junggar ( Fig. 1b; An and Zhu, 2009;Choulet et al, 2012;Geng et al, 2011). Plutons in West Junggar mostly consist of granitoids, emplaced mostly by three distinct epochs, i.e., 422-405 Ma, 346-321 Ma, and 316-281 Ma (Chen and Jahn, 2004;Fig.…”

Section: Geological Setting and Petrological Characteristicsmentioning

confidence: 99%

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China: Implications for Late Paleozoic crustal growth in Central Asia

et al. 2015

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“…Apart from being dominated by gold and chromite, this region is an oilfield for China as well as a potential exploration for Cu-Au-Pb-Zn. In addition, this region has complex tectonic and magmatic activities which have resulted in numerous mineralisations (e.g., porphyry Cu and Au deposits, porphyry-quartz vein-greisen tungsten and Mo deposits, copper-nickel sulphide deposits and podiform chromite deposits) (An & Zhu, 2009;Liu et al, 2009b;Zhu, 2014).…”

Section: Geological Backgroundmentioning

confidence: 99%

Application of geostatistical analyst methods in discovering concealed gold and pathfinder elements as geochemical anomalies related to ore mineralisation

Lindagato

Yang

et al. 2018

Geologos

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The study area in the West Junggar Basin is known to be rich in hydrothermal gold deposits and occurrences, even though there has been minimum exploration in the area. It is here hypothesised that this area could host more gold deposits if mineral exploration methods were to be reinforced. This research is aimed at identifying geochemical anomalies of Au, and determining possible factors and conditions which facilitate the formation of anomalies by referring to As and Hg as gold pathfinders. Geostatistical analyst techniques have been applied to 9,852 stream sediments and bedrock data collected on a total surface of 1,280 km2 of West Junggar, Xinjiang (northwest China). The kriging interpolation and quantile-quantile plot methods, combined with statistical methods, successfully identified both Au and its pathfinders’ anomalies. In the present study, median was considered as background values (10.2 ppm for As, 9.13 ppb for Hg and 2.5 ppb for Au), whereas the 95th percentile were threshold values (28.03 ppm for As, 16.71 ppb for Hg and 8.2 ppb for Au) and values greater than thresholds are geochemical anomalies. Moreover, the high concentrations of these three discovered elements are caused primarily by hydrothermal ore mineralisation and are found to be controlled mainly by the Hatu and Sartohay faults of a northeast-southwesterly direction as well as their related secondary faults of variable orientation, which facilitate the easy flow of hydrothermal fluids towards the surface resulting in the formation of geochemical anomalies. Most of anomalies concentration of Au are found near the mining sites, which indicates that the formation of new Au anomalies is influenced by current or previous mining sites through geological or weathering processes. In addition, the low concentration of gold and its pathfinders found far from active gold mine or faults indicates that those anomalies are formed due to primary dispersion of hosting rock.

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Significance of native arsenic in the Baogutu gold deposit, western Junggar, Xinjiang, NW China

Cited by 18 publications

References 15 publications

Geochemistry of hydrothermal gold deposits: A review

Geochemistry of hydrothermal gold deposits: A review

Petrogenesis of Early-Permian sanukitoids from West Junggar, Northwest China: Implications for Late Paleozoic crustal growth in Central Asia

Application of geostatistical analyst methods in discovering concealed gold and pathfinder elements as geochemical anomalies related to ore mineralisation

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