Abstract
There is a chemical gap between basalts and intermediate lavas in numerous anorogenic volcanic suites. The principal cause is thought to be in situ closed-system high-pressure partial crystallization of bodies of basaltic magma, with release of evolved liquid residua only when the masses are approximately half solid. This implies that most tholeiitic andesites, hawaiites and trachyandesites are generated at upper mantle depths, not in high-level sub-volcanic magma reservoirs.
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THOMPSON, R. Evidence for a Chemical Discontinuity near the Basalt–Andesite Transition in Many Anorogenic Volcanic Suites. Nature 236, 106–110 (1972). https://doi.org/10.1038/236106a0
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DOI: https://doi.org/10.1038/236106a0
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