Geochronology and geochemistry of porphyritic intrusions in the Duolong porphyry and epithermal Cu-Au district, central Tibet: Implications for the genesis and exploration of porphyry copper deposits

Sun, Jing; Mao, Jingwen; Beaudoin, Georges; Duan, Xianzhe; Yao, Fojun; Ouyang, Hegen; Wu, Yue; Li, Yubin; Meng, Xuyang

doi:10.1016/j.oregeorev.2016.08.029

Cited by 40 publications

(12 citation statements)

References 91 publications

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“…Previous studies indicated small intermediate-felsic porphyritic intrusions and Cu-Au sulfide ores in Duolong ore district were from 120 to 110 Ma [45,46], which was accompanied by large-scale mineralization. In fact, aluminum hydroxyl (Al-OH) and magnesium hydroxyl (Mg-OH) were important prospecting indicators [36][37][38][39].…”

Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

“…Our model can be applied to optimizing ore prospecting target areas in the deposit. The metals and ore-forming fluids of Porphyry deposits in Duolong ore district are more likely to be released from magma chamber [45,46]. The RS-based model of alteration zonation constructed for the Duolong ore district was integrated with various prospecting factors in the western part of the Bangong-Nujiang metallogenic belt.…”

Section: Discussionmentioning

confidence: 99%

“…Cretaceous Meiriqie Formation is composed up of basaltic andesite and andesite, and widely distributed in the Duolong district (Figure 1c). An extensive emplacement of volumetrically small intermediate-felsic porphyritic intrusions that comprise similar major minerals (quartz, ±plagioclase, ±amphibole, ±biotite) and accessory minerals (magnetite, ±zircon, ±apatite) took place from 120 to 110 Ma [45,46], which was accompanied by large-scale mineralization in the Duobuza and Bolong deposits. The oldest rocks in the Duolong district are represented by the Triassic Riganpeicuo Group, which mainly consists of marble and limestone (Figure 1b).…”

Section: Tectonic Settingmentioning

confidence: 99%

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A Remote-Sensing-Based Alteration Zonation Model of the Duolong Porphyry Copper Ore District, Tibet

Yao

Yang

et al. 2021

Remote Sensing

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Remote sensing (RS) of alteration zones and anomalies can provide information that is useful for geological prospecting and exploration. RS is an effective method for porphyry copper mineral exploration and prospecting prediction. More specifically, the Advanced Spaceborne Thermal Emission and Reflection radiometer (ASTER) data, which include 14 spectral channels from visible light to thermal infrared, are useful in such cases. This study uses visible-shortwave infrared and thermal infrared ASTER data together with surface material spectra from the Duolong porphyry copper ore district to construct an RS-based alteration zonation model of the deposit. In this study, an RS alteration zoning model is established based on ground-spectral alteration zoning results. The methods include PCA (Principal Component Analysis), Ratio, and Slope methods. The information obtained by each method is different. RS-based alteration zonation is developed based on the intersection of maps, resultant from the different methods for extracting information related to different minerals. The alteration zonation information extracted from ASTER RS data is consistent with geological observations. Using information from the RS-based model, we mapped the alteration minerals and zones of the Duolong ore district, thereby identifying prospecting target areas of the deposit.

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Section: Discussionmentioning

confidence: 93%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Tectonic Settingmentioning

confidence: 99%

See 2 more Smart Citations

A Remote-Sensing-Based Alteration Zonation Model of the Duolong Porphyry Copper Ore District, Tibet

Yao

Yang

et al. 2021

Remote Sensing

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“…While the closure time of the BNO is controversial, some studies suggest that the BNO may have closed during the Late Jurassic–Early Cretaceous through arc–arc ‘soft’ collision, most likely within 140–130 Ma (Zhu et al, 2016), and then entered the post‐collisional stage of the orogeny at approximately 110 Ma (Qu, Wang, Xin, Jiang, & Chen, 2012; Song et al, 2018). However, some studies have recommended that the BNO was still subducting northward during the Early Cretaceous, possibly within 106–125 Ma (Geng et al, 2016; Li et al, 2014; Sun et al, 2017; Xu et al, 2017).…”

Section: Geological Backgroundmentioning

confidence: 99%

Sulphide geochemistry of the superlarge Tiegelongnan Cu (Au) deposit in Tibet, China: Implication for the mineralization process

Lin

Wang

et al. 2021

Geological Journal

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The Tiegelongnan deposit in central Tibet presents a typical high‐sulfidation porphyry Cu (Au) mineralization system. Optical microscopy, scanning electron microscopy–energy dispersive spectrometry (SEM–EDS), and laser ablation inductively coupled plasma mass spectrometry (LA–ICPMS) were used to understand the mineralization processes. The advanced argillic alteration zone directly contacts the phyllic alteration zone, which is linked to the Early Cretaceous porphyritic intrusions. In this study, the spatial distributions of chief copper sulphides with variable gangue minerals are illustrated. The deep inner phyllic zone typically produced an end‐member assemblage of chalcopyrite–sericite (±dolomite), which trended upwards to produce more bornite–sericite (±siderite ± magnesite), and subsequently, the advanced argillic alteration yielded the representative end‐member assemblage of tennantite–alunite ± (aluminium‐phosphate‐sulphate, namely, APS, ±kaolinite). In the phyllic–advanced argillic transition zone, intensive covellite precipitation with the widespread occurrence of sericite–kaolinite (±APS) assemblage is proposed as an important feature in this study, which is mainly produced on the southwest side of the ore‐body centre. The typical co‐occurrence of chalcopyrite with dolomite at great depths indicates that it was related to a gently acidic fluid containing CO2; however, the pervasive tennantite–alunite association present at shallower levels suggests that fluids with SO2 were mainly involved and produced stronger acidic conditions. Acidic fluids are demonstrated to highly accelerate water‐rock alteration. Trace element analyses of the copper sulphides reflect that Au concentrations of bornite and tennantite are higher than chalcopyrite and covellite and present small signal variations. Moreover, comparing the presence of micron‐sized Au‐telluride in tennantite under advanced argillic alteration with the nano‐sized native gold in bornite resulting from phyllic alteration suggests that to a certain extent, Au enrichment is affected by the shift of more Te contents in fluid towards shallower levels, which could promote Au precipitation. Additionally, the Se contents of the selected samples were typically concentrated in chalcopyrite, bornite, and covellite, which yielded contents an order of magnitude greater than those in tennantite, indicating the intimate hydrothermal origin of the first three sulphides. Overall, the sulphide–gangue mineral associations and their copper sulphide geochemistry indicate that the hypogene–chalcopyrite of low Au contents from the phyllic zone closely corresponds to the action of gentle acidic fluids with CO2, while more acidic fluids with SO2 are involved in the formation of supergene tennantite with relatively high values of Au and Te in the advanced argillic alteration.

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Primary fluid exsolution in porphyry copper systems: evidence from magmatic apatite and anhydrite inclusions in zircon

Evans

et al. 2020

Miner Deposita

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Geochronology and geochemistry of porphyritic intrusions in the Duolong porphyry and epithermal Cu-Au district, central Tibet: Implications for the genesis and exploration of porphyry copper deposits

Cited by 40 publications

References 91 publications

A Remote-Sensing-Based Alteration Zonation Model of the Duolong Porphyry Copper Ore District, Tibet

A Remote-Sensing-Based Alteration Zonation Model of the Duolong Porphyry Copper Ore District, Tibet

Sulphide geochemistry of the superlarge Tiegelongnan Cu (Au) deposit in Tibet, China: Implication for the mineralization process

Primary fluid exsolution in porphyry copper systems: evidence from magmatic apatite and anhydrite inclusions in zircon

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