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Title: Shishaldin volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation

Abstract

High-alumina basalts (HABs) from volcanic arcs commonly contain 30%-50% (modal) plagioclase. It has been suggested that they reflect plagioclase addition and are not primary compositions. In rocks from the Aleutian volcano Shishaldin, the authors search for evidence of plagioclase accumulation: Al{sub 2}O{sub 3}, CaO, and Na{sub 2}O vs. modal plagioclase; europium anomalies in HABs; plagioclase-liquid equilibrium; and the HAB groundmass. The HABs do not appear to be results of plagioclase addition to liquids of dacitic, Fe-Ti enriched, or high-Mg basaltic compositions. Plagioclase loss from HABs does appear to yield the Fe-Ti-enriched basalts. Shishaldin HABs may reflect near-primary compositions, and HAB phase equilibria may thus be useful in evaluating the origin of such arc basalts.

Authors:
;  [1]
  1. (Johns Hopkins Univ., Baltimore, Maryland (USA))
Publication Date:
OSTI Identifier:
5524287
Resource Type:
Journal Article
Journal Name:
Geology; (USA)
Additional Journal Information:
Journal Volume: 19:3; Journal ID: ISSN 0091-7613
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; ALEUTIAN ISLANDS; VOLCANOES; BASALT; GEOCHEMISTRY; ALASKA; ALUMINIUM OXIDES; ANORTHOSITES; CALCIUM OXIDES; ENRICHMENT; EQUILIBRIUM; EUROPIUM COMPOUNDS; IRON; MAGNESIUM; ORIGIN; PHASE STUDIES; SODIUM OXIDES; TITANIUM; ALKALI METAL COMPOUNDS; ALKALINE EARTH METAL COMPOUNDS; ALKALINE EARTH METALS; ALUMINIUM COMPOUNDS; CALCIUM COMPOUNDS; CHALCOGENIDES; CHEMISTRY; DEVELOPED COUNTRIES; ELEMENTS; FEDERAL REGION X; GABBROS; IGNEOUS ROCKS; ISLANDS; METALS; NORTH AMERICA; OXIDES; OXYGEN COMPOUNDS; PLUTONIC ROCKS; RARE EARTH COMPOUNDS; ROCKS; SODIUM COMPOUNDS; TRANSITION ELEMENTS; USA; VOLCANIC ROCKS; 580000* - Geosciences

Citation Formats

Fournelle, J., and Marsh, B.D. Shishaldin volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation. United States: N. p., 1991. Web. doi:10.1130/0091-7613(1991)019<0234:SVAHAB>2.3.CO;2.
Fournelle, J., & Marsh, B.D. Shishaldin volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation. United States. doi:10.1130/0091-7613(1991)019<0234:SVAHAB>2.3.CO;2.
Fournelle, J., and Marsh, B.D. Fri . "Shishaldin volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation". United States. doi:10.1130/0091-7613(1991)019<0234:SVAHAB>2.3.CO;2.
@article{osti_5524287,
title = {Shishaldin volcano: Aleutian high-alumina basalts and the question of plagioclase accumulation},
author = {Fournelle, J. and Marsh, B.D.},
abstractNote = {High-alumina basalts (HABs) from volcanic arcs commonly contain 30%-50% (modal) plagioclase. It has been suggested that they reflect plagioclase addition and are not primary compositions. In rocks from the Aleutian volcano Shishaldin, the authors search for evidence of plagioclase accumulation: Al{sub 2}O{sub 3}, CaO, and Na{sub 2}O vs. modal plagioclase; europium anomalies in HABs; plagioclase-liquid equilibrium; and the HAB groundmass. The HABs do not appear to be results of plagioclase addition to liquids of dacitic, Fe-Ti enriched, or high-Mg basaltic compositions. Plagioclase loss from HABs does appear to yield the Fe-Ti-enriched basalts. Shishaldin HABs may reflect near-primary compositions, and HAB phase equilibria may thus be useful in evaluating the origin of such arc basalts.},
doi = {10.1130/0091-7613(1991)019<0234:SVAHAB>2.3.CO;2},
journal = {Geology; (USA)},
issn = {0091-7613},
number = ,
volume = 19:3,
place = {United States},
year = {1991},
month = {3}
}