CHARACTERIZATION OF A HIGH-SULFIDATION EPITHERMAL DEPOSIT WITHIN THE ANTELOPE VALLEY VOLCANIC CENTER, SIERRA COUNTY CALIFORNIA

2018 ◽  
Author(s):  
Sommer M. Casady ◽  
◽  
Hannah Aird
Keyword(s):  
Volcanic Center ◽  
Epithermal Deposit ◽  
High Sulfidation

EXPLORATION OF A HIGH-SULFIDATION EPITHERMAL DEPOSIT WITHIN THE ANTELOPE VALLEY VOLCANIC CENTER, SIERRA COUNTY CALIFORNIA

2017 ◽  
Author(s):  
Sommer M. Casady ◽  
◽  
Hannah Aird ◽  
Hannah Aird ◽  
Andrew Guglielmo ◽  
...  
Keyword(s):  
Volcanic Center ◽  
Epithermal Deposit ◽  
High Sulfidation

The Nadun Cu–Au mineralization, central Tibet: Root of a high sulfidation epithermal deposit

2016 ◽  
Vol 78 ◽  
pp. 371-387 ◽  
Author(s):  
Jin-Xiang Li ◽  
Ke-Zhang Qin ◽  
Guang-Ming Li ◽  
Noreen J. Evans ◽  
Jun-Xing Zhao ◽  
...  
Keyword(s):  
Epithermal Deposit ◽  
High Sulfidation ◽  
Central Tibet

Characterization of Illite Clays associated with the Sinongduo low sulfidation epithermal deposit, Central Tibet using field SWIR spectrometry

2020 ◽  
Vol 120 ◽  
pp. 103228 ◽  
Author(s):  
Na Guo ◽  
Wenbo Guo ◽  
Weixin Shi ◽  
Yiru Huang ◽  
Yanan Guo ◽  
...  
Keyword(s):  
Epithermal Deposit ◽  
Central Tibet ◽  
Low Sulfidation

Characterization of the oxidation and oxidation-sulfidation of chromium niobium alloys

1994 ◽  
Vol 52 ◽  
pp. 674-675
Author(s):  
J. C. Duncan ◽  
L. Touryan ◽  
L. W. Hobbs
Keyword(s):  
Coal Gasification ◽  
Scale Growth ◽  
Protective Oxide ◽  
Niobium Alloys ◽  
High Sulfidation ◽  
Simultaneous Oxidation ◽  
Energy Conversion Systems ◽  
Environmental Sem ◽  
Simultaneous Oxidation And Sulfidation

Materials in mixed corrosion environments, such as those in coal gasification processes or other energy conversion systems, may be exposed to both oxygen and sulfur. Alloys that exhibit simultaneous oxidation and sulfidation resistance are sought for these applications. Alloys containing sufficient Al or Cr readily form a protective oxide scale but generally have high sulfidation rates. Refractory metals, such as Nb or Mo, form protective sulfides but oxidize at catastrophic rates. Materials containing additives of one of these groups have been studied for their complex corrosion resistance. A binary alloy containing components from each group (Cr and Nb) has been investigated in mixed oxidants .Isothermal thermogravimetric measurements give overall scale growth kinetics but do not give details for complex scales or substrates. Multiple layers, different growth regimes and preferential corrosion can complicate interpretation. The environmental SEM with a hot stage attachment allows the observation of scale development at temperature.

scholarly journals The Pliocene Xoconostle high sulfidation epithermal deposit in the Trans-Mexican Volcanic Belt: Preliminary study

2020 ◽  
Vol 72 (3) ◽  
pp. A260520
Author(s):  
Edith Fuentes-Guzmán ◽  
Antoni Camprubí ◽  
Janet Gabites ◽  
Eduardo González-Partida ◽  
Vanessa Colás
Keyword(s):  
Regional Scale ◽  
Volcanic Belt ◽  
Structural Features ◽  
Epithermal Deposit ◽  
Metallogenic Province ◽  
High Sulfidation ◽  
South Central ◽  
Mexican Volcanic Belt ◽  
Trans Mexican Volcanic Belt ◽  
Good Agreement

The Xoconostle prospect in northeastern Michoacán state, south-central Mexico, is constituted by high sulfidation epithermal breccias and stockworks with Au and Hg prospective anomalies. The mineralization is hosted by latest Miocene to Pliocene rocks grouped into the El Terrero ignimbrite and the Siete Cruces dome complex and a stock of intermediate composition and undetermined (Pliocene?) age. Two alunite samples from deep hypogene advanced argillic alteration assemblages within the deposit yielded 40Ar/39Ar ages at 5.57 ± 0.44 (Messinian) and 3.67 ± 0.20 Ma (Zanclean). Such ages are in good agreement with those of volcanic rocks at a semi-regional scale, especially those associated with the nearby Amealco caldera. Assuming that the formation of Xoconostle deposit could be genetically related to any of the eruptive units in this caldera, it would be associated with dacitic-andesitic rocks at ~4.7 Ma or with bimodal andesite-basalt volcanism at ~3.7 Ma, with which rhyolites at the southwest rim of the caldera (nearer to the epithermal deposit) are contemporaneous. The obtained ages are also in good agreement with those determined for the youngest stages in the evolution of the Trans-Mexican Volcanic Belt (TMVB). In addition, such ages compare well with those established for the E-W striking Morelia-Acambay normal fault zone (or Acambay graben). The occurrence of E-W structural features in the study area support their correlation with those in the Acambay graben. Although the metallogenesis of the TMVB needs further endeavours that contribute to its understanding, the Xoconostle prospect adds up to other dated magmatic-hydrothermal deposits that may collectively constitute a Pliocene metallogenic province whose inception was geologically circumscribed to this volcanic arc. However, this and its companion papers in this issue confirm the metallogenic potential of the TMVB in most of its stages of evolution, particularly in the late Miocene-Pliocene stage of acid and bimodal volcanism.

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