Trace Element Contents in Sphalerite from the Nayongzhi Zn-Pb Deposit, Northwestern Guizhou, China: Insights into Incorporation Mechanisms, Metallogenic Temperature and Ore Genesis

Chen, Wei; Huang, Zhilong; Yan, Zeyu; Hu, Yusi; Ye, Lin

doi:10.3390/min8110490

Cited by 36 publications

(24 citation statements)

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“…This number could be expressed as PC1*=ln( ), and the empirical relationship between this number and the homogenization temperature is expressed as T(°C)= -(55.4 ± 7.3)•PC1* + (208 ± 10). Based on that formula, the oreforming temperature of several Zn-Pb deposits have been calculated according to trace element concentrations in sphalerite, such as Nayongzhi Zn-Pb deposit (100.5-164.4°C in accordant with the homogenization temperature of fluid inclusions in sphalerite 102.1-155.2°C , Wei et al, 2018). Similarly, considering the lack of study on the homogenization temperature of fluid inclusions in Dadongla, the ore-forming temperature of this deposit could be obtained using the empirical formula, listed in Table 2.…”

Section: Ore-forming Temperaturementioning

confidence: 99%

Trace Elements in Sphalerite from the Dadongla Zn‐Pb Deposit, Western Hunan–Eastern Guizhou Zn‐Pb Metallogenic Belt, South China

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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The western Hunan–eastern Guizhou Zn‐Pb metallogenic belt is one of the important Zn‐Pb mineralization regions in China. The Dadongla deposit, located in the northeast of Guizhou Province, is one of the typical Zn‐Pb deposits in the region and has estimated resources more than 12 million metric tons (Mt) with an average grade of 4.11 wt% Zn+Pb. Its orebodies are hosted in the lower Cambrian Aoxi Formation dolomite, occurring as bedded, para‐bedded in shape, and in conformity with the wall rock. The ore mineral assemblage is simple, dominated by sphalerite with minor pyrite and galena, and the gangue minerals are composed of dolomite, calcite with minor bitumen and barite. In view of the lack of geological and geochemical researches, the genesis of Zn‐Pb ore is still unclear. Laser ablation‐inductively coupled plasma mass spectrometry (LA‐ICPMS) spot and mapping analyses were used to obtain sphalerite trace element chemistry in the Dadongla Zn‐Pb deposit in Guizhou, China, aiming to constrain its ore genesis. The results show that sphalerite is characterized by the enrichment of Cd, Fe, Ge and Hg, corresponding with that of typical MVT deposits. Four zones were identified in the sphalerite crystal from Dadongla from the center to margin according to the color bands, in which the zone in the center, representing the early ore‐stage sphalerite, is characterized by enrichment of Cd relatively, while the zone forming at late ore‐stage is enriched in Ge and Hg relatively. The finding was controlled by differential leached metals content in ore‐forming fluid from its source rock. Notably, critical element Ge trends to be enriched at the late ore‐stage and follows a substitution of 2Zn2+↔ Ge4++□ (vacancy). Moreover, the calculated ore‐forming temperature ranges from 79.9°C to 177.6°C by the empirical formula, which is similar to that of typical Mississippi Valley‐type (MVT) deposits. Compared with the features of trace elements in sphalerite from different types of deposits, together with the geology, the Dadongla deposit belongs to an MVT Zn‐Pb deposit.

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Section: Ore-forming Temperaturementioning

confidence: 99%

Trace Elements in Sphalerite from the Dadongla Zn‐Pb Deposit, Western Hunan–Eastern Guizhou Zn‐Pb Metallogenic Belt, South China

Chen

et al. 2020

Acta Geologica Sinica (Eng)

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“…The following isotopes were monitored: 23 66 Zn served for internal calibration, using measured 64.6 wt.% data from EPMA (Wei et al, 2018a). External reference materials STDGL2b3 (Danyushevsky et al, 2011), GSD-1G and GSE-1G were used for instrument drift correction and trace-element quantification.…”

Section: La-icpms Multi-element Analysis and Element Mappingmentioning

confidence: 99%

“…The deposit lies in the NE-trending Wuzhishan anticline and is limited by two parallel NNE-trending regional faults, the Jichangpo and the Xiongchang faults (Fig. 1c; Wei et al , 2018a and reference therein). In the Nayongzhi area, the lower Cambrian Qingxudong Formation is divided into three members based on lithological features: (1) argillaceous dolostone and carbonaceous dolostone; (2) laminated dolostone interlayered with zebra dolostone; and (3) fine-grained dolostone and argillaceous dolostone (e.g.…”

Section: Geology Of the Nayongzhi Mvt Depositmentioning

confidence: 99%

“…

Fig. 1(a) The location of the Sichuan–Yunnan–Guizhou metallogenic province (SYGMP) in South China (modified from Wei et al , 2018a); (b) location of the Nayongzhi deposit in the SYGMP (modified from CIGMR, 2003); (c) simplified geological map of the Nayongzhi deposit; (d) representative cross-section showing the occurrence and morphology of the sulfide orebodies at Nayongzhi. The location of the section is indicated in (c).…”

Section: Geology Of the Nayongzhi Mvt Depositmentioning

confidence: 99%

“…The economic minerals in the Nayongzhi MVT deposit consist of sphalerite and galena with minor pyrite, accompanied by hydrothermal dolomite and calcite as the main gangue minerals. The main ore stage consists of coarsely crystallised sphalerite and galena, accompanied by fine-grained pyrite with co-existing hydrothermal dolomite (Wei et al , 2018a; Zhou et al , 2018). Coarsely crystallised sphalerite is essentially restricted to cavity and fracture fillings of the host rock (Wei, 2018), which is a common texture of the main ore stage.…”

Section: Geology Of the Nayongzhi Mvt Depositmentioning

confidence: 99%

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In situtrace elements and S isotope systematics for growth zoning in sphalerite from MVT deposits: A case study of Nayongzhi, South China

Chen

Huang

et al. 2021

MinMag

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Zoning texture in sphalerite has been described in many studies, although its genesis and ore formation process are poorly constrained. In this investigation, we compare the in situ trace element and isotopic composition of colour-zoned sphalerites from Nayongzhi, South China, to explain the zoning growth process. Petrographic observations identified two broad types of zoned sphalerite, core–rim (CR) and core–mantle–rim (CMR) textures. Each zoned sphalerite displays two or three colour zones, including brown core, light colour bands and/or pale-yellow zones. In situ laser ablation inductively coupled plasma mass spectrometry trace-element analyses show that the three colour zones display variable trace-element compositions. Brown cores exhibit distinctly high Mn, Fe, Co, Ge, Tl and Pb concentrations, whereas pale-yellow and light colour zones have elevated Ga, Cd, Sn, In and Sb concentrations. Copper, Sb, In and Sn show slight variations between pale-yellow and light zones, the latter having higher In and Sn, but lower Cu and Sb abundances. Given the low concentration range of Pb, Ge, Tl, Mn Sb, Cd, etc., the colour of sphalerite is attributed mainly to Fe compositional variation. The δ34S values of sphalerite from Nayongzhi range from +22.3 to +27.9‰, suggesting reduced sulfur was generated by thermochemical sulfate reduction of marine sulfate in ore-hosted strata. Single-crystal colour-zoned sphalerite exhibits intracrystalline δ34S variation (up to 4.3‰), which is attributed to the δ34S composition of H2S in the original fluid. The lack of correlation between trace elements and δ34S values indicates episodic ore solution influxes and mixes with the reduced sulfur-rich fluid derived from the aquifers of the ore-hosted strata, which play a key role in the formation of the zoned Nayongzhi sphalerite. In conclusion, in situ trace element and S isotope studies of zoned sphalerite crystals might provide insight into the ore-forming process of MVT deposits.

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Genesis of greenockite (CdS) and associated sulphide‐gold mineralization from Mahakoshal belt, Central Indian Tectonic Zone

et al. 2023

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The Zn‐Cd‐S critical minerals system is a significant mineralogical indicator of hydrothermal ore‐forming processes. The understanding of greenockite (CdS) formation in natural mineral systems is very restricted due to low crustal abundances (Cd <0.2 ppm). We report the first occurrence of greenockite from the Bagada orogenic gold prospect, Paleoproterozoic Mahakoshal belt, Central Indian Tectonic Zone (CITZ). This provides an ideal opportunity to access the occurrence and its genesis. Greenockite occurs in discrete sheared quartz veins hosted in phyllites. Sulphide mineralization is closely associated with hydrothermal chlorite alterations. Pyrrhotite, arsenopyrite, pyrite, and chalcopyrite assemblages are formed at high temperatures, while sphalerite and galena precipitated when the temperature decreased. Greenockite, native silver and bismuth with gold precipitated during the breakdown of arsenopyrite to scorodite in progressively oxidizing conditions. Greenockite precipitation occurred in a transforming hydrothermal environment from a reducing to an oxidizing one during late‐stage hydrothermal alteration. Sphalerite and chlorite thermometry yielded temperatures in the range from 266 to 366°C for this late‐stage hydrothermal alteration. Textural relations show two modes of occurrence of greenockite, one (Gck‐1) as exsolution within sphalerite (Sp‐2) and the other (Gck‐2) occurring as a discontinuous rim replacing the Cd‐rich sphalerite (Sp‐3). The Gck‐1 contains high Zn and low Cd, while as compared to Gck‐2. Zinc and Cd in greenockite show diadochy relation (Zn2+ ↔ Cd2+). Laser ablation ICPMS analyses of sphalerite (Sp‐2) reveal remarkably high Cd contents (1.9–12 wt%). Cd >0.02 ppm suggests possible Cd derivation from sphalerite (Sp‐2) under variable fS2, T, pH, fO2 conditions, fluid–rock interaction, and change in the Zn/Cd ratio. Sphalerite compositions display a low Zn/Cd (av.22) ratio and high temperature of formation, with characteristics intermediate between volcanogenic massive sulphides (VMS) and magmatic‐hydrothermal Cu‐Pb‐Zn system.

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Trace Element Contents in Sphalerite from the Nayongzhi Zn-Pb Deposit, Northwestern Guizhou, China: Insights into Incorporation Mechanisms, Metallogenic Temperature and Ore Genesis

Cited by 36 publications

References 47 publications

Trace Elements in Sphalerite from the Dadongla Zn‐Pb Deposit, Western Hunan–Eastern Guizhou Zn‐Pb Metallogenic Belt, South China

Trace Elements in Sphalerite from the Dadongla Zn‐Pb Deposit, Western Hunan–Eastern Guizhou Zn‐Pb Metallogenic Belt, South China

In situtrace elements and S isotope systematics for growth zoning in sphalerite from MVT deposits: A case study of Nayongzhi, South China

Genesis of greenockite (CdS) and associated sulphide‐gold mineralization from Mahakoshal belt, Central Indian Tectonic Zone

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