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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10500 - Earth and related environmental sciences

Projekt

<a href="/cs/project/GA14-13347S" target="_blank" >GA14-13347S: Variabilita lehkých prvků (Li, Be, B) ve vybraných horninotvorných a akcesorických minerálech z felsických magmatických a metamorfovaných hornin</a><br>

Návaznosti

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

Rok uplatnění

2017

Kód důvěrnosti údajů

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

Název periodika

Canadian Mineralogist

ISSN

0008-4476

e-ISSN

—

Svazek periodika

55

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

CA - Kanada

Počet stran výsledku

15

Strana od-do

333-347

Kód UT WoS článku

000405808600009

EID výsledku v databázi Scopus

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