Genesis of acid-sulfate alteration and Au-Cu-Ag mineralization at Summitville, Colorado

Stoffregen, Roger E.

doi:10.2113/gsecongeo.82.6.1575

Cited by 299 publications

(240 citation statements)

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“…High concentrations of Al have never been observed in general hot spring fluids on lands and at mid oceanic ridges, except for extremely acidic fluids with a pH of less than 2 (Ossaka et al, 1977;Gamo et al, 1997b). Aluminum is known to be leached from silicate minerals by acid attack (Stoffregen, 1987). A high sulfidation hydrothermal system at the DESMOS Caldera in the eastern Manus Basin, Papua New Guinea, is associated with the hydrothermal plume with aluminum anomaly of 1,500 nM at its maximum .…”

Section: Hydrothermal Plumesmentioning

confidence: 99%

Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane

et al. 2004

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This paper reports a series of studies leading to the discovery of a submarine hydrothermal field (called Nakayama Field) at an arc seamount (12∞43¢ N, 143∞32¢ E) in the southernmost part of the Mariana Trough, western Pacific Ocean. We first detected hydrothermal plumes characterized by water column anomalies of temperature, light transmission, Mn, Fe, Al, O 2 , CH 4 , and d 13 C of CH 4 above the summit caldera of the seamount. Then deep-tow camera surveys confirmed the existence of hydrothermal activity inside the caldera, and an ROV dive finally discovered white smoker-type fluid venting associated with vent fauna. A high concentration of aluminum in the plume and white smoker-type emissions imply acidic hydrothermal activity similar to that observed at the DESMOS Caldera in the eastern Manus Basin, Papua New Guinea. Anomalously low d 13 C (CH 4 ) of -38‰ of a vent fluid sample compared to other arc hydrothermal systems along the IzuBonin and Mariana Arcs suggests an incorporation of biogenic methane based on a subsurface microbial ecosystem.

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Section: Hydrothermal Plumesmentioning

confidence: 99%

Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane

et al. 2004

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“…Alunite is a common mineral occurring in advanced argillic alteration in alumino-silicate rocks (Meyer and Hemly 1967;Stoffregen 1987). Keshe is the first occurrence of this kind of alteration described in Central Iran with geologic, mineralogical and geochemical data.…”

Section: Discussionmentioning

confidence: 99%

Geology and mineralogy of advanced argillic alteration in the Keshe area (Mt. Karkas), Central Iran

Taghipour¹,

Mackizadeh²,

Pourmoghani³

et al. 2008

Central European Geology

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The Keshe area is a part of Cenozoic magmatic belt of Central Iran. Some volcanics in this area underwent hydrothermal alteration including kaolinitization and alunitization. The altered rocks are characterized by an assemblage of alunite, kaolinite and quartz, which is typical in advanced argillic alteration. The mineralogical study suggests that the hydrothermal alteration in this area occurred in a magmatic hydrothermal environment.

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“…열수변질대를 구성하는 열수변질광물들은 가시 근적외선, 단파장적외선, 열적외선 영역의 특정파장대 역에서 특징적인 분광학적 흡수특성을 보인다 (Abrams et al, 1983;Spatz and Wilson, 1995). 진행되고 있다 Rowan et al, 2006;Di Tommaso and Rubinstein, 2007 (Steven and Ratt, 1960;Buchanan, 1981;Stoffregen, 1987;Sillitoe, 1993; (Koh, 1996), 이 중 해남층은 다 시 6개 화산암류와 서로 시기가 다른 3개의 화성복합 체로 세분된다 (Bowden, 2007). (Clark et al, 1993).…”

Section: 여러 유형의 금속광상 중에서 반암동광상은 열수변unclassified

Identification of Advanced Argillic-altered Rocks of the Haenam Area, Using by ASTER Spectral Analysis

Lee¹,

Kim²,

Moon³

2011

Economic and Environmental Geology

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The Haenam epithermal mineralized zone is located in the southwestern part of South Korea, and hosts low sulfidation epithermal Au-Ag deposit (Eunsan-Moisan) and clay quarries (Okmaesan, Seongsan, and Chunsan). Epithermal deposits and accompanying hydrothermal alteration related to Cretaceous volcanism caused large zoned assemblages of hydrothermal alteration minerals. Advanced argillic-altered rocks with mineral assemblages of alunite-quartz, alunite-dickite-quartz, and dickite-kaolinite-quartz exposed on the Okmaesan, Seongsan, and Chunsan area. Advanced Spaceborne Thermal Emission and Reflection Radiometer (ASTER), with three visible and near infrared bands, six shortwave infrared bands, and five thermal infrared bands, was used to identify advanced argillic-altered rocks within the Haenam epithermal mineralized zone. The distinct spectral features of hydrothermal minerals allow discrimination of advanced argillic-altered rocks from non-altered rocks within the study area. Because alunite, dickite, and kaolinite, consisting of advanced argillic-altered rocks within the study area are characterized by Al-O-H-bearing minerals, these acid hydrothermal minerals have a strong absorption feature at 2.20 µm. The band combination and band ratio transformation cause increasing differences of DN values between advanced argillic-altered rock and non-altered rock. The alunite and dickite-kaolinite of advanced argillic-altered rocks from the Okmaesan, Seongsan, and Chunsan have average DN values of 1.523 and 1.737, respectively. These values are much higher than those (1.211 and 1.308, respectively) of non-altered area. ASTER images can remotely provide the distribution of hydrothermal minerals on the surface. In this way good relation between ASTER spectra analysis and field data suggests that ASTER spectral analysis can be useful tool in the initial steps of mineral exploration.

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Genesis of acid-sulfate alteration and Au-Cu-Ag mineralization at Summitville, Colorado

Cited by 299 publications

References 0 publications

Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane

Discovery of a new hydrothermal venting site in the southernmost Mariana Arc: Al-rich hydrothermal plumes and white smoker activity associated with biogenic methane

Geology and mineralogy of advanced argillic alteration in the Keshe area (Mt. Karkas), Central Iran

Identification of Advanced Argillic-altered Rocks of the Haenam Area, Using by ASTER Spectral Analysis

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