A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems

Research output: Contribution to journalArticleResearchpeer review

Authors

  • Xudong Wang
  • Tong Hou
  • Meng Wang
  • Chao Zhang
  • Zhaochong Zhang
  • Ronghao Pan
  • Felix Marxer
  • Hongluo Zhang

Research Organisations

External Research Organisations

  • China University of Geosciences
  • Northwest University China
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Details

Original languageEnglish
Pages (from-to)621-637
Number of pages17
JournalEuropean journal of mineralogy
Volume33
Issue number5
Publication statusPublished - 15 Oct 2021

Abstract

Clinopyroxene-only thermobarometry is one of the most practical tools to reconstruct crystallization pressures and temperatures of clinopyroxenes. Because it does not require any information of coexisting silicate melt or other co-crystallized mineral phases, it has been widely used to elucidate the physiochemical conditions of crystallizing magmas. However, previously calibrated clinopyroxene-only thermobarometers display low accuracy when being applied to mafic and intermediate magmatic systems. Hence, in this study, we present new empirical nonlinear barometric and thermometric models, which were formulated to improve the performance of clinopyroxene-only thermobarometry. Particularly, a total of 559 experimental runs conducted in the pressure range of 1gbar to 12gkbar have been used for calibration and validation of the new barometric and thermometric formulation. The superiority of our new models with respect to previous ones was confirmed by comparing their performance on 100 replications of calibration and validation, and the standard error of estimate (SEE) of the new barometer and thermometer are 1.66gkbar and 36.6gg C, respectively. Although our new barometer and thermometer fail to reproduce the entire test dataset, which has not been used for calibration and validation, they still perform well on clinopyroxenes crystallized from subalkaline basic to intermediate magmas (i.e., basaltic, basalt-andesitic, dacitic magma systems). Thus, their applicability should be limited to basaltic, basalt-andesitic and dacitic magma systems. In a last step, we applied our new thermobarometer to several tholeiitic Icelandic eruptions and established magma storage conditions exhibiting a general consistency with phase equilibria experiments. Therefore, we propose that our new thermobarometer represents a powerful tool to reveal the crystallization conditions of clinopyroxene in mafic to intermediate magmas.

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Cite this

A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems. / Wang, Xudong; Hou, Tong; Wang, Meng et al.
In: European journal of mineralogy, Vol. 33, No. 5, 15.10.2021, p. 621-637.

Research output: Contribution to journalArticleResearchpeer review

Wang X, Hou T, Wang M, Zhang C, Zhang Z, Pan R et al. A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems. European journal of mineralogy. 2021 Oct 15;33(5):621-637. doi: 10.5194/ejm-33-621-2021
Wang, Xudong ; Hou, Tong ; Wang, Meng et al. / A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems. In: European journal of mineralogy. 2021 ; Vol. 33, No. 5. pp. 621-637.
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AU - Hou, Tong

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AU - Zhang, Chao

AU - Zhang, Zhaochong

AU - Pan, Ronghao

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AU - Zhang, Hongluo

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