The ore-forming process of the Maoping Pb–Zn deposit, northeastern Yunnan, China: Constraints from cathodoluminescence (CL) petrography of hydrothermal dolomite

Wei, Aiying; Xue, Chuandong; Xiang, Kun; Li, Jing; Liao, Cheng; Akhter, Qureshi Javed

doi:10.1016/j.oregeorev.2015.02.007

Cited by 37 publications

(10 citation statements)

References 36 publications

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“…Dong et al, 2016;Mansurbeg et al, 2016;Feng et al, 2017) and as hosts to Mississippi Valley-Type lead-zinc mineralization (e.g. Leach and Sangster, 1993;Hendry et al, 2015;Wei et al, 2015). In most cases, hydrothermal dolomites form near faults developed in extensional tectonic settings, where faults provide pathways for hydrothermal fluids (e.g.…”

Section: Introductionmentioning

confidence: 99%

Syn‐sedimentary hydrothermal dolomites in a lacustrine rift basin: Petrographic and geochemical evidence from the lower Cretaceous Erlian Basin, Northern China

Yang

Whitaker

et al. 2019

Sedimentology

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Dolomites occur extensively in the lower Cretaceous along syn-sedimentary fault zones of the Baiyinchagan Sag, westernmost Erlian Basin, within a predominantly fluvial-lacustrine sedimentary sequence. Four types of dolomite are identified, associated with hydrothermal minerals such as natrolite, analcime and Fe-bearing magnesite. The finely-crystalline dolomites consist of anhedral to subhedral crystals (2 to 10 μm), evenly commixed with terrigenous sediments that occur either as matrix supporting grains (Fd1) or as massive argillaceous dolostone (Fd2). Medium-crystalline (Md) dolomites are composed of subhedral to euhedral crystals aggregates (50 to 250 μm) and occur in syn-sedimentary deformation laminae/bands. Coarse-crystalline (Cd) dolomites consist of non-planar crystals (mean size >1 mm), and occur as fracture infills crosscutting the other dolomite types. Fd1, Md and Cd dolomites have similar values of δ 18 O (−20.5 to −11.0 ‰ Vienna PeeDee Belemnite) and δ 13 C (+1.4 to +4.5 ‰ Vienna PeeDee Belemnite), but Fd2 dolomites are isotopically distinct (δ 18 O −8.5 to −2.3‰ Vienna PeeDee Belemnite; δ 13 C +1.4‰ to +8.6‰ Vienna PeeDee Belemnite). Samples define three groups which differ in light rare-earth elements vs. high rare-earth elements enrichment/depletion and significance of Tb, Yb and Dy anomalies. Md dolomites have signatures that indicate formation from brines at very high temperature, with salinities of 11.8 to 23.2 eq. wt. % NaCl and T h values of 167 to 283°C. The calculated temperatures of Fd1 and Cd dolomites extend to slightly lower values (141 to 282°C), while Fd2 dolomites are distinctly cooler (81 to 124°C). These results suggest that the dolomites formed from hydrothermal fluid during and/or penecontemporaneous with sediment deposition. Faults and fractures bounding the basin were important conduits through which high-temperature Mg-rich fluids discharged, driven by an abnormally high heat flux associated with local volcanism. It is thought that differing amounts of cooling and degassing of these hydrothermal fluids, and of mixing with lake waters, facilitated the precipitation of dolomite and associated minerals, and resulted in the petrographic and geochemical differences between the dolomites.

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Section: Introductionmentioning

confidence: 99%

Syn‐sedimentary hydrothermal dolomites in a lacustrine rift basin: Petrographic and geochemical evidence from the lower Cretaceous Erlian Basin, Northern China

Yang

Whitaker

et al. 2019

Sedimentology

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“…Numerous studies have shown that most of the Pb-Zn deposits in the SYG area are MVT deposits, including Huize (Han et al 2007a), Tianbaoshan (Ye et al 2016), Daliangzi (Yuan et al 2014), Maoping (Wei et al 2015), Wusihe (Xiong et al 2018) and Jinshachang (Bai et al 2013) deposits. Interestingly, the Fule deposit is hosted in the middle Permian Yangxin Formation, and the distance between the Fule Pb-Zn ore bodies and upper Permian Emeishan flood basalts is less than 50 m (Fig.…”

Section: C Ore Genesismentioning

confidence: 99%

“…Zhang et al 2015;Zhou et al 2018a). Several giant deposits have been found, including the Huize (> 5.0 Mt of PbþZn reserves; Zhou et al 2001), Daliangzi (c. 3.0 Mt of PbþZn reserves; Zheng & Wang, 1991), Maoping (> 2.5 Mt of PbþZn reserves; Wei et al 2015), Tianbaoshan (> 2.0 Mt of PbþZn reserves; Zhou et al 2013c), Nayongzhi (c. 1.5 Mt of PbþZn reserves; Zhou et al 2018b) and Fule (> 1.0 Mt of PbþZn reserves; Lü, 2014) Pb-Zn deposits. Among these deposits, the Fule deposit is hosted in the carbonate rocks of the middle Permian Yangxin Formation ( Fig.…”

Section: Introductionmentioning

confidence: 99%

Origin of the Fule Pb–Zn deposit, Yunnan Province, SW China: insight from in situ S isotope analysis by NanoSIMS

et al. 2019

Geol. Mag.

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The Sichuan–Yunnan–Guizhou (SYG) Pb–Zn metallogenic province is one of the most productive areas of Pb–Zn resources in China. The Fule deposit occurs in Permian carbonate and contains Pb–Zn reserves exceeding 1 Mt. To investigate the sulphur source, in situ S isotopic analysis of sphalerite and pyrite was carried out using nanoscale secondary-ion mass spectrometry. The results show that the δ34S values of the sulphide minerals range from +16.1‰ to +23.0‰, higher than that of marine sulphates hosted in Permian carbonate rocks (+11‰), but similar to that of sulphates over a broader area (+12.9‰ to +25.9‰). The sulphates in the regional rocks could therefore represent an important source of S for the Fule deposit via thermochemical sulphate reduction. The S source of the Fule deposit is different from those of most other Pb–Zn deposits in the SYG Pb–Zn mineralization province, which were mainly derived from the ore-bearing strata. The δ34S values of the early to late generations and some single sulphide crystals from the cores to rims show a slight increasing trend, implying that partial Rayleigh fractionation took place in the Fule deposit. It is suggested that the Fule sulphide precipitation resulted from the mixing of a metalliferous fluid with a H2S-rich fluid derived from the regional strata. Combining the geology, mineralogy and S isotope results with previous Pb isotope studies, it is suggested that the Fule deposit should be attributed to a Mississippi Valley type deposit.

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“…They find evidence for two distinct ore-forming fluids, an ascending metamorphic fluid and a descending basinal brine, which mixed in structural traps along thrust and later strike-slip faults. Wei et al (2015) report on detailed ore-forming processes in the Maoping Pb-Zn MVT deposit, which is hosted by Carboniferous limestones in the Sichuan-Yunnan-Guizhou Pb-Zn metallogenic province of the western Yangtze Block, southwestern China. They relate ore deposition to diagenetic processes involving dolomitization and carbonate dissolution by acids generated during sulfide precipitation.…”

Section: Contents Lists Available At Sciencedirectmentioning

confidence: 99%

Preface

Richards¹

2015

Ore Geology Reviews

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The ore-forming process of the Maoping Pb–Zn deposit, northeastern Yunnan, China: Constraints from cathodoluminescence (CL) petrography of hydrothermal dolomite

Cited by 37 publications

References 36 publications

Syn‐sedimentary hydrothermal dolomites in a lacustrine rift basin: Petrographic and geochemical evidence from the lower Cretaceous Erlian Basin, Northern China

Syn‐sedimentary hydrothermal dolomites in a lacustrine rift basin: Petrographic and geochemical evidence from the lower Cretaceous Erlian Basin, Northern China

Origin of the Fule Pb–Zn deposit, Yunnan Province, SW China: insight from in situ S isotope analysis by NanoSIMS

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