Trace-element geochemistry of sulfides in lherzolite xenoliths from East Antarctica

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F21%3A00000114" target="_blank" >RIV/00025798:_____/21:00000114 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.mdpi.com/2075-163X/11/7/773" target="_blank" >https://www.mdpi.com/2075-163X/11/7/773</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3390/min11070773" target="_blank" >10.3390/min11070773</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Trace-element geochemistry of sulfides in lherzolite xenoliths from East Antarctica

Popis výsledku v původním jazyce

Sulfides in upper mantle lherzolite xenoliths from Cretaceous alkaline-ultramafic rocks inthe Jetty Peninsula (East Antarctica) were studied for their major and trace-element compositionsusing SEM and LA-ICP-MS applied in situ. Modal abundance of sulfides is the lowest in Cpx-poorlherzolites Spl-Grt lherzolites <;<; Cpx-rich lherzolites. Most sulfides are either interstitial (i-type) orinclusions in rock-forming minerals (e-type) with minor sulfide phases mostly present in metasomaticveinlets and carbonate-silicate interstitial patches (m-type). The main sulfide assemblage is pentlandite+ chalcopyrite pyrrhotite; minor sulfides are polydymite, millerite, violarite, siegenite, andmonosulfide solution (mss). Sulfide assemblages in the xenolith matrix are a product of the subsolidusre-equilibration of primary mss at temperatures below 300 C. Platinum group elements (PGE)abundances suggest that most e-type sulfides are the residues of melting processes and that the i-typesulfides are crystallization products of sulfide-bearing fluids/liquids. The m-type sulfides might haveresulted from low-temperature metasomatism by percolating sulfide-carbonate-silicate fluids/melts.The PGE in sulfide record processes are related to partial melting in mantle and intramantle meltmigration. Most other trace elements initially partitioned into interstitial sulfide liquid and latermetasomatically re-enriched residual sulfides overprinting their primary signatures. The extent ofelement partitioning into sulfide liquids depends on P, T, fO2, and host peridotite composition

Název v anglickém jazyce

Trace-element geochemistry of sulfides in lherzolite xenoliths from East Antarctica

Popis výsledku anglicky

Sulfides in upper mantle lherzolite xenoliths from Cretaceous alkaline-ultramafic rocks inthe Jetty Peninsula (East Antarctica) were studied for their major and trace-element compositionsusing SEM and LA-ICP-MS applied in situ. Modal abundance of sulfides is the lowest in Cpx-poorlherzolites Spl-Grt lherzolites <;<; Cpx-rich lherzolites. Most sulfides are either interstitial (i-type) orinclusions in rock-forming minerals (e-type) with minor sulfide phases mostly present in metasomaticveinlets and carbonate-silicate interstitial patches (m-type). The main sulfide assemblage is pentlandite+ chalcopyrite pyrrhotite; minor sulfides are polydymite, millerite, violarite, siegenite, andmonosulfide solution (mss). Sulfide assemblages in the xenolith matrix are a product of the subsolidusre-equilibration of primary mss at temperatures below 300 C. Platinum group elements (PGE)abundances suggest that most e-type sulfides are the residues of melting processes and that the i-typesulfides are crystallization products of sulfide-bearing fluids/liquids. The m-type sulfides might haveresulted from low-temperature metasomatism by percolating sulfide-carbonate-silicate fluids/melts.The PGE in sulfide record processes are related to partial melting in mantle and intramantle meltmigration. Most other trace elements initially partitioned into interstitial sulfide liquid and latermetasomatically re-enriched residual sulfides overprinting their primary signatures. The extent ofelement partitioning into sulfide liquids depends on P, T, fO2, and host peridotite composition

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2021

Kód důvěrnosti údajů

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

Název periodika

Minerals

ISSN

2075-163X

e-ISSN

—

Svazek periodika

11

Číslo periodika v rámci svazku

7 : 773

Stát vydavatele periodika

CH - Švýcarská konfederace

Počet stran výsledku

32

Strana od-do

nestránkováno

Kód UT WoS článku

000676488400001

EID výsledku v databázi Scopus

2-s2.0-85110085152