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Reaction experiments between tonalitic melt and mantle olivine and their implications for genesis of high-Mg andesites within cratons

Reaction experiments between tonalitic melt and mantle olivine and their implications for genesis... High-Mg (Mg#>45) andesites (HMA) within cratons attract great attention from geologists. Their origin remains strongly debated. In order to examine and provide direct evidence for previous assumptions about HMA’s genesis inferred from petrological and geochemical investigations, we performed reaction experiments between tonalitic melt and mantle olivine on a six-anvil apparatus at high-temperature of 1250–1400°C and high-pressure of 2.0–5.0 GPa. Our experiments in this work simulated the interaction between the tonalitic melt derived from partial melting of eclogitized lower crust foundering into the Earth’s mantle and mantle peridotite. The experimental results show that the reacted melts have very similar variations in chemical compositions to the HMAs within the North China Craton. Therefore, this interaction is probably an important process to generate the HMAs within crations. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Science in China Series D: Earth Sciences Springer Journals

Reaction experiments between tonalitic melt and mantle olivine and their implications for genesis of high-Mg andesites within cratons

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References (32)

Publisher
Springer Journals
Copyright
Copyright © 2013 by Science China Press and Springer-Verlag Berlin Heidelberg
Subject
Earth Sciences; Earth Sciences, general
ISSN
1006-9313
eISSN
1869-1897
DOI
10.1007/s11430-013-4658-6
Publisher site
See Article on Publisher Site

Abstract

High-Mg (Mg#>45) andesites (HMA) within cratons attract great attention from geologists. Their origin remains strongly debated. In order to examine and provide direct evidence for previous assumptions about HMA’s genesis inferred from petrological and geochemical investigations, we performed reaction experiments between tonalitic melt and mantle olivine on a six-anvil apparatus at high-temperature of 1250–1400°C and high-pressure of 2.0–5.0 GPa. Our experiments in this work simulated the interaction between the tonalitic melt derived from partial melting of eclogitized lower crust foundering into the Earth’s mantle and mantle peridotite. The experimental results show that the reacted melts have very similar variations in chemical compositions to the HMAs within the North China Craton. Therefore, this interaction is probably an important process to generate the HMAs within crations.

Journal

Science in China Series D: Earth SciencesSpringer Journals

Published: Nov 1, 2013

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