A discussion on the geobarometers applied to estimate the crystallization pressure of calc- alkaline felsic intrusions
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    Abstract:

    In this review, four commonly used geobarometers, i.e., aluminum- in- amphibole, biotite, sphene (titanite), and “quartz” barometers, are testified for their suitability to estimate the crystallization pressure of calc- alkaline felsic intrusive rocks. Using a compilation of mineral chemistry and whole- rock composition data from some typical calc- alkaline felsic intrusions in home and abroad, we found that there are systematic correlations between the results from the new proposed octahedral aluminum- in- amphibole barometer and those from the typical aluminum- in- hornblende barometer. Meanwhile, the pressures calculated by the sphene (titanite) Al2O3 content barometer are finely correlated with the estimations from aluminum- in- hornblende barometer. The “quartz” barometer which is established on the Qtz—Ab—Or hapalogranitic system, can be only used to constraints the crystallization pressures of the metaluminous to weak peraluminous granites (s.s.). However, neither the empirical biotite barometer nor the experiment- derived biotite barometer replicate the aluminum- in- amphibole barometry for natural rocks. Accordingly, it is suggested that the barometry from biotite is not suitable for calculating the crystallization pressure of calc- alkaline felsic intrusive rocks.

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XU Hongxue, WANG Yang.2023. A discussion on the geobarometers applied to estimate the crystallization pressure of calc- alkaline felsic intrusions[J]. Geological Review,69(6):2325-2334.

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History
  • Received:December 08,2022
  • Revised:August 14,2023
  • Adopted:
  • Online: November 20,2023
  • Published: