Human impacts in Antarctica: trace-element geochemistry of freshwater lakes in the Larsemann Hills, East Antarctica

2000 ◽  
Vol 39 (9) ◽  
pp. 963-976 ◽  
Author(s):  
M. Gasparon ◽  
J. S. Burgess
Keyword(s):  
Trace Element ◽  
Human Impacts ◽  
East Antarctica ◽  
Trace Element Geochemistry ◽  
Freshwater Lakes ◽  
Element Geochemistry ◽  
Larsemann Hills

scholarly journals Trace-Element Geochemistry of Sulfides in Upper Mantle Lherzolite Xenoliths from East Antarctica

Minerals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 773
Author(s):  
Alexandre V. Andronikov ◽  
Irina E. Andronikova ◽  
Tamara Sidorinova
Keyword(s):  
Trace Element ◽  
Upper Mantle ◽  
East Antarctica ◽  
Trace Element Geochemistry ◽  
Sulfide Liquid ◽  
Element Geochemistry ◽  
Element Partitioning ◽  
Icp Ms ◽  
Modal Abundance

Sulfides in upper mantle lherzolite xenoliths from Cretaceous alkaline-ultramafic rocks in the Jetty Peninsula (East Antarctica) were studied for their major and trace-element compositions using SEM and LA-ICP-MS applied in situ. Modal abundance of sulfides is the lowest in Cpx-poor lherzolites ≤ Spl-Grt lherzolites << Cpx-rich lherzolites. Most sulfides are either interstitial (i-type) or inclusions in rock-forming minerals (e-type) with minor sulfide phases mostly present in metasomatic veinlets and carbonate-silicate interstitial patches (m-type). The main sulfide assemblage is pentlandite + chalcopyrite ± pyrrhotite; minor sulfides are polydymite, millerite, violarite, siegenite, and monosulfide solution (mss). Sulfide assemblages in the xenolith matrix are a product of the subsolidus re-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-type sulfides are crystallization products of sulfide-bearing fluids/liquids. The m-type sulfides might have resulted 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 melt migration. Most other trace elements initially partitioned into interstitial sulfide liquid and later metasomatically re-enriched residual sulfides overprinting their primary signatures. The extent of element partitioning into sulfide liquids depends on P, T, fO2, and host peridotite composition.

REGIONAL TRACE ELEMENT GEOCHEMISTRY OF ZIRCONS IN THE JURASSIC VOLCANIC ARC OF THE SOUTHWEST U.S

2016 ◽  
Author(s):  
Jennifer A. Laughlin ◽  
◽  
Joseph L. Wooden ◽  
A.P. Barth ◽  
John T. Shukle ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Volcanic Arc

PATTERNS OF TRACE ELEMENT GEOCHEMISTRY IN CULTURED NEOGLOBOQUADRINA PACHYDERMA CRUST CALCITE

2020 ◽  
Author(s):  
Caitlin M. Livsey ◽  
◽  
Catherine V. Davis ◽  
Jennifer S. Fehrenbacher ◽  
Claudia Benitez-Nelson ◽  
...  
Keyword(s):  
Trace Element ◽  
Trace Element Geochemistry ◽  
Element Geochemistry ◽  
Neogloboquadrina Pachyderma
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