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Title: Experimental study bearing on the absence of carbonate in mantle-derived xenoliths

Abstract

Experimentation at high pressures in peridotite + CO{sub 2} systems has suggested that some CO{sub 2}-rich, Si-undersaturated magmas originate in mantle source regions consisting of carbonated peridotite. However, a caveat to the petrological application of such experiments has been the virtual absence of carbonate in mantle xenoliths. Decompression experiments were undertaken to resolve this problem and to test the hypothesis that carbonated peridotite exists in the upper mantle, but decomposes during ascent as xenoliths in its host magma. The author demonstrate that carbonate coexisting with silicates in mantle-derived xenoliths could not survive entrainment even in the fastest ascending magmas due to rapid decarbonation upon decompression. The author conclude that carbonate may indeed exist in the upper mantle, and that the paucity of this phase in mantle-derived xenoliths does not require its absence in the mantle source regions of many primary, alkalic magmas.

Authors:
 [1]
  1. Univ. of Alberta, Edmonton (Canada)
Publication Date:
OSTI Identifier:
6140033
Resource Type:
Journal Article
Journal Name:
Geology; (USA)
Additional Journal Information:
Journal Volume: 18:10; Journal ID: ISSN 0091-7613
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; CARBONATE ROCKS; DECOMPOSITION; CARBON DIOXIDE; EARTH MANTLE; MAGMA; PERIDOTITES; SILICATE MINERALS; SOURCE ROCKS; CARBON COMPOUNDS; CARBON OXIDES; CHALCOGENIDES; CHEMICAL REACTIONS; IGNEOUS ROCKS; MINERALS; OXIDES; OXYGEN COMPOUNDS; PLUTONIC ROCKS; ROCKS; SEDIMENTARY ROCKS; 580000* - Geosciences

Citation Formats

Canil, D. Experimental study bearing on the absence of carbonate in mantle-derived xenoliths. United States: N. p., 1990. Web. doi:10.1130/0091-7613(1990)018<1011:ESBOTA>2.3.CO;2.
Canil, D. Experimental study bearing on the absence of carbonate in mantle-derived xenoliths. United States. https://doi.org/10.1130/0091-7613(1990)018<1011:ESBOTA>2.3.CO;2
Canil, D. 1990. "Experimental study bearing on the absence of carbonate in mantle-derived xenoliths". United States. https://doi.org/10.1130/0091-7613(1990)018<1011:ESBOTA>2.3.CO;2.
@article{osti_6140033,
title = {Experimental study bearing on the absence of carbonate in mantle-derived xenoliths},
author = {Canil, D},
abstractNote = {Experimentation at high pressures in peridotite + CO{sub 2} systems has suggested that some CO{sub 2}-rich, Si-undersaturated magmas originate in mantle source regions consisting of carbonated peridotite. However, a caveat to the petrological application of such experiments has been the virtual absence of carbonate in mantle xenoliths. Decompression experiments were undertaken to resolve this problem and to test the hypothesis that carbonated peridotite exists in the upper mantle, but decomposes during ascent as xenoliths in its host magma. The author demonstrate that carbonate coexisting with silicates in mantle-derived xenoliths could not survive entrainment even in the fastest ascending magmas due to rapid decarbonation upon decompression. The author conclude that carbonate may indeed exist in the upper mantle, and that the paucity of this phase in mantle-derived xenoliths does not require its absence in the mantle source regions of many primary, alkalic magmas.},
doi = {10.1130/0091-7613(1990)018<1011:ESBOTA>2.3.CO;2},
url = {https://www.osti.gov/biblio/6140033}, journal = {Geology; (USA)},
issn = {0091-7613},
number = ,
volume = 18:10,
place = {United States},
year = {Mon Oct 01 00:00:00 EDT 1990},
month = {Mon Oct 01 00:00:00 EDT 1990}
}