Basalt magma interaction with harzburgite and the formation of high‐magnesium andesites
作者:
Martin R. Fisk,
期刊:
Geophysical Research Letters
(WILEY Available online 1986)
卷期:
Volume 13,
issue 5
页码: 467-470
ISSN:0094-8276
年代: 1986
DOI:10.1029/GL013i005p00467
数据来源: WILEY
摘要:
The interaction of basalt melt with mantle harzburgite at low pressure might result in silica enrichment of the melt by assimilation of orthopyroxene. Experimental tests of this hypothesis show that silica‐rich liquids (56 wt %) are produced by melt‐orthopyroxene reaction at 1200° to 1250°C. These silica‐rich liquids are enriched in Na2O and K2O over that found in the starting basalt melt which indicates that the alkalis diffused against a concentration gradient into the silica‐rich liquid. The liquids produced in this way are chemically similar to high‐magnesium andesites o
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