Mineralogy of the Ash Mountain Sn-bearing skarn, Tuya Range, northern British Columbia, Canada

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F17%3A00094934" target="_blank" >RIV/00216224:14310/17:00094934 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.3749/canmin.1600064" target="_blank" >http://dx.doi.org/10.3749/canmin.1600064</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3749/canmin.1600064" target="_blank" >10.3749/canmin.1600064</a>

Result language

angličtina

Original language name

Mineralogy of the Ash Mountain Sn-bearing skarn, Tuya Range, northern British Columbia, Canada

Original language description

The Ash Mountain Sn-bearing skarn, located in the Tuya Range of the Cassiar Mountains in northern British Columbia, was investigated in order to provide the first modern, comprehensive characterization of its mineralogy and zoning and to identify the main skarn-forming processes. The Ash Mountain skarn is unusual with respect to other Sn-bearing skarns because the main Sn-bearing minerals are malayaite and andradite (with 2.33 wt.% SnO2), and no cassiterite has been found to date. The associated intrusive body-the Parallel Creek granite-is a highly fractionated, felsic, A-type, biotite granite that was generated in a within-plate setting. The biotite in the granite is Al-rich annite with elevated Ti (up to 2.77 wt.% TiO2), F (up to 2.04 wt.% F), and Cl (up to 0.33 wt.% Cl); annite in an associated aplite dike contains up to 0.47 wt.% Cl. High F and Cl in annite indicate a high amount of fluxing components and could be used as an indicator of mineralized granites. The Ash Mountain skarn is an oxidized, calcic tin skarn that was formed through a sequence of metasomatic events that resulted in the crystallization of two distinct skarn zones: a proximal andradite skarn and a distal grossular-diopside-vesuvianite skarn. The paragenetic sequence of the skarn was determined to be: (1) Al + Si metasomatism of dolomite-bearing limestone to a grossular-diopside-vesuvianite skarn, (2) overprinting of the grossular-diopside-vesuvianite skarn by a Sn-bearing andradite skarn due to Fe metasomatism, and (3) remobilization of Sn in the andradite skarn by a reducing hydrothermal fluid, to crystallize malayaite. The near endmember composition of the malayaite suggests that this latest stage of skarn formation occurred at low temperatures (ca., 450 degrees C). The absence of cassiterite can be attributed to prevailing basic conditions during hydrothermal alteration.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10500 - Earth and related environmental sciences

Project

<a href="/en/project/GA14-13347S" target="_blank" >GA14-13347S: Variability of light elements (Li, Be, B) in selected rock-forming and accessory minerals from felsic magmatic and metamorphic rocks</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Canadian Mineralogist

ISSN

0008-4476

e-ISSN

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Volume of the periodical

55

Issue of the periodical within the volume

2

Country of publishing house

CA - CANADA

Number of pages

15

Pages from-to

333-347

UT code for WoS article

000405808600009

EID of the result in the Scopus database

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