Preliminary observations of kaolinite in a volcanogenic massive sulphide deposit of Permian age

McLeod, R. L.

doi:10.1007/bf01082965

Cited by 13 publications

(3 citation statements)

References 14 publications

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“…Because different hydrothermal fluids usually form under different physicochemical conditions, the contents of trace elements in pyrite vary significantly. Co and Ni are the most common trace elements in pyrite, and their contents and the Co/Ni ratio are often used to trace the genesis, deposition environment, and formation temperature of pyrite (Bralia et al, 1979;Campbell and Ethier, 1984;Bajwah et al, 1987;Cook, 1996). Different genetic types of pyrite usually have different Co/Ni ratios (Bralia et al, 1979;Brill, 1989;Large et al, 2011).…”

Section: Genesis Of Pyritementioning

confidence: 99%

Mineralization of the Tuwu Porphyry Cu Deposit in Eastern Tianshan, NW China: Insights From In Situ Trace Elements of Chlorite and Pyrite

Tan

Mao

et al. 2021

Front. Earth Sci.

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The Tuwu porphyry copper deposit is located on the Dananhu-Haerlik island arc in eastern Tianshan, NW China. Based on geology, petrology, and in situ trace element studies of pyrite and chlorite, we redefined the characteristics of hydrothermal fluids and the following three mineralization stages: premineralization stage (stage Ⅰ), porphyry metallogenic stage (stage Ⅱ), and superimposed transformation stage (stage Ⅲ). Pyrite stage Ⅰ (Py-I) has the highest Co/Ni ratios, and the precipitation crystallization of chlorite (Chl-I2) has the similar rare earth element distribution patterns with those of volcanic rocks Carboniferous Qieshan (CQ), indicating intense volcanic hydrothermal activity. The Co/Ni ratios of Py-II1 and Py-II2 (stage Ⅱ) tend to decrease over time. Moreover, the rare earth element (REE) distribution patterns of Chl-II have similar LREE enrichment, and the Eu anomalies in Chl-II1, Chl-II2, and Chl-II3 range from positive to negative. The initial ore-forming fluid was mainly magmatic hydrothermal fluid, and with the late-stage addition of meteoric water and continuous sulfide precipitation, the trace element composition of the fluid changed, and the whole system became more oxidizing. Py-III (stage Ⅲ) has the lowest Co/Ni ratios, and the REE distribution pattern of Chl-III is characterized by LREE enrichment. Moreover, the Chl-III shows obvious shear deformation characteristics. The results indicate that the host rocks experienced intensely superimposed reformation. By combining and integrating our results with the regional evolution processes in the eastern Tianshan, we propose that the Tuwu porphyry deposit has undergone magmatic hydrothermal and metamorphic hydrothermal processes. Volcanism (stage Ⅰ) provided the space and initial conditions for the emplacement of the metallogenic body. With the emplacement of the plagiogranite porphyry (stage Ⅱ), the main copper mineralization occurred in the porphyry and surrounding rocks. After porphyry mineralization (stage Ⅲ), regional ductile shearing and collisional compression led to a copper reaction, and its accumulation along the faults formed an ore shoot.

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Section: Genesis Of Pyritementioning

confidence: 99%

Mineralization of the Tuwu Porphyry Cu Deposit in Eastern Tianshan, NW China: Insights From In Situ Trace Elements of Chlorite and Pyrite

Tan

Mao

et al. 2021

Front. Earth Sci.

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“…Differences in host rock composition and metamorphic grade lead to differences in the phyllosilicate mineral assemblages associated with VMS deposits, potentially providing a remote sensing basis for their discrimination. For instance, greenschist-grade metamorphic rocks show enhanced crystallinity of clay minerals, both associated with hydrothermal alteration, and within the groundmass (for example, McLeod and Stanton, 1984;McLeod, 1985McLeod, , 1987McLeod and others, 1987). Higher metamorphic grades, such as amphibolite facies, will destroy clay minerals, such as kaolinite, unless these clay minerals are replenished through supergene alteration processes.…”

Section: Geologic Settingmentioning

confidence: 99%

Recent U.S. Geological Survey Studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada-Results of a 5-Year Project

Gough¹,

Day²

2010

Scientific Investigations Report

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Cover. View of a portion of the Black Mountain tectonic zone (ridge in background) looking northeast across the Tibbs Creek drainage within the Yukon-Tanana Upland. This zone, the subject of chapter D of this report, is the locus of almost all of the mineralized base and precious metal veins in the Big Delta B-1 quadrangle. The zone is characterized by complex faulting, shearing, intrusions, and zones of gold and antimony mineralization (photograph by Larry P. Gough).

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“…Such rocks show enhanced crystallinity of clay minerals, both associated with hydrothermal alteration, and within the metamorphic rock groundmass (e.g. McLeod and Stanton, 1984;McLeod, 1985;1987;McLeod et al, 1987). Higher metamorphic grades such as amphibolite will alter clay minerals such as kaolinite unless they are replenished by supergene alteration processes.…”

Section: Geologic Settingmentioning

confidence: 99%

Geologic Mapping and Mineral Resource Assessment of the Healy and Talkeetna Mountains Quadrangles, Alaska Using Minimal Cloud- and Snow-Cover ASTER Data

Hubbard¹,

Rowan²,

Dusel-Bacon³

et al. 2007

Open-File Report

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On July 8, 2003, ASTER acquired satellite imagery of a 60 km-wide swath of parts of two 1:250,000 Alaska quadrangles, under favorable conditions of minimal cloud-and snow-cover. Rocks from eight different lithotectonic terranes are exposed within the swath of data, several of which define permissive tracts for various mineral deposit types such as: volcanic-hosted massive sulfides (VMS) and porphyry copper and molybdenum. Representative rock samples collected from 13 different lithologic units from the Bonnifield mining district within the Yukon-Tanana terrane (YTT), plus hydrothermally altered VMS material from the Red Mountain prospect, were analyzed to produce a spectral library spanning the VNIR-SWIR (0.4-2.5 µm) through the TIR (8.1-11.7 µm).

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Preliminary observations of kaolinite in a volcanogenic massive sulphide deposit of Permian age

Cited by 13 publications

References 14 publications

Mineralization of the Tuwu Porphyry Cu Deposit in Eastern Tianshan, NW China: Insights From In Situ Trace Elements of Chlorite and Pyrite

Mineralization of the Tuwu Porphyry Cu Deposit in Eastern Tianshan, NW China: Insights From In Situ Trace Elements of Chlorite and Pyrite

Recent U.S. Geological Survey Studies in the Tintina Gold Province, Alaska, United States, and Yukon, Canada-Results of a 5-Year Project

Geologic Mapping and Mineral Resource Assessment of the Healy and Talkeetna Mountains Quadrangles, Alaska Using Minimal Cloud- and Snow-Cover ASTER Data

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