A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-Review

Autoren

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

Externe Organisationen

  • China University of Geosciences (CUG)
  • Northwest University China
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Details

OriginalspracheEnglisch
Seiten (von - bis)621-637
Seitenumfang17
FachzeitschriftEuropean journal of mineralogy
Jahrgang33
Ausgabenummer5
PublikationsstatusVeröffentlicht - 15 Okt. 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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A new clinopyroxene thermobarometer for mafic to intermediate magmatic systems. / Wang, Xudong; Hou, Tong; Wang, Meng et al.
in: European journal of mineralogy, Jahrgang 33, Nr. 5, 15.10.2021, S. 621-637.

Publikation: Beitrag in FachzeitschriftArtikelForschungPeer-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 Okt 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 ; Jahrgang 33, Nr. 5. S. 621-637.
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AU - Wang, Xudong

AU - Hou, Tong

AU - Wang, Meng

AU - Zhang, Chao

AU - Zhang, Zhaochong

AU - Pan, Ronghao

AU - Marxer, Felix

AU - Zhang, Hongluo

N1 - Funding Information: Financial support. This research has been supported by

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Y1 - 2021/10/15

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JO - European journal of mineralogy

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