Indium Mineralization in Copper–Tin Stratiform Skarn Ores at the Saishitang–Rilonggou Ore Field, Qinghai, Northwest China

Liu, Jianping; Gu, Xiangping; Shao, Yongjun; Feng, Yuzhou; Lai, Jin

doi:10.1111/rge.12108

Cited by 6 publications

(7 citation statements)

References 18 publications

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“…The Hf isotope data indicates that the intrusions of the Saishitang deposit originated from the partial melting of Mesoproterozoic lower crustal materials with the involvement of mantle-derived magmas [28]. The zircon U-Pb ages of the quartz diorite yielded an estimate of 223-220 Ma, suggesting that they were emplaced in the Late Triassic [26,39].…”

Section: Intrusive Rocksmentioning

confidence: 99%

“…The stratigraphy of the Saishitang deposit consists mainly of a Lower Permian series that underwent extensive regional metamorphism (also regarded as the Middle-Lower Triassic by some researchers [28]) overlain by Paleogene-Neogene and Quaternary covers (Figure 1b), as well as a slice of Proterozoic high-grade metamorphosed rock [26,29]. The ore-bearing stratum of the Saishitang deposit constitutes Group C of the Lower Permian series [26].…”

Section: Stratigraphymentioning

confidence: 99%

“…Cu-polymetallic skarn deposits are distributed east of the Elashan region, particularly in the Saishitang-Rilonggou orefield [26,29,35] which is the most important Cu mineralization area in Qinghai, or even in China [35]. Among these deposits, the Saishitang Cu deposit is a well-developed and studied deposit [26][27][28][29]36,37], and furthermore, constitutes a typical skarn Cu deposit example for understanding mineralization in the Elashan region. A large number of Cu-polymetallic skarn, Fe-polymetallic skarn, and orogenic Au deposits (Figure 1b) in the EMB are related to the Late Triassic granites [34].…”

Section: Regional Geology Of the Elashan Regionmentioning

confidence: 99%

“…The ore-bearing stratum of the Saishitang deposit constitutes Group C of the Lower Permian series [26]. Skarn and ore bodies occur mainly in the contact between intrusions, metamorphosed tuff, and marble-containing metamorphosed siltstone [28].…”

Section: Stratigraphymentioning

confidence: 99%

“…The deposit is hosted in stratiform skarn, which contains 1468 t of Cd, last evaluated in 1980s [25]. Zincian greenockite was previously discovered during critical metals studies [26]. This provides a good opportunity to assess how the zincian greenockite was formed during the mineralization processes of skarn deposits.…”

Section: Introductionmentioning

confidence: 99%

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A New Zincian Greenockite Occurrence in the Saishitang Cu Skarn Deposit, Qinghai Province, Northwest China

Liu

Shu-gen

2017

Minerals

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Zn-Cd-S series minerals not only comprise industrial resources for Zn and Cd, but are also significant mineralogical indicators for hydrothermal ore-forming processes. Due to its unique formation conditions and rare occurrence, our understanding of the formation of zincian greenockite in natural systems is limited. Zincian greenockite was discovered during mineralogical studies in the Saishitang Cu skarn deposit, Qinghai Province, Northwest China. This provided an ideal opportunity to assess the occurrence and formation of zincian greenockite in skarn-type deposits. Ore minerals were observed using reflected-light microscopy, and the zincian greenockite was further analyzed using electron-probe microanalysis (EPMA) and X-ray diffraction (XRD). The zincian greenockite occurs in the bornite-chalcopyrite ores and is composed of subhedral to anhedral grains approximately 50 × 150 µm 2 to 200 × 300 µm 2 in size, replaces the bornite, and is replaced by native silver. Two phases (I and II) were identified based on back-scattered electron images, X-ray element-distributions maps, and EPMA data. The textural relationship indicated that Phase I was replaced by Phase II. Phase I contained high Zn (14.6 to 21.7 mol % ZnS) and low Cd (72.4 to 82.2 mol % CdS), while Phase II contained low Zn (5.6 to 9.1 mol % ZnS) and high Cd (85.4 to 89.9 mol % CdS). The zincian greenockite was formed at temperature of 300~270 • C during the transformation from a reducing environment to an oxidizing one in the late stage of the mineralization process in the Saishitang deposit.

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Section: Intrusive Rocksmentioning

confidence: 99%