Single clinopyroxene thermobarometry for garnet peridotites. Part I. Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer
- Paolo NimisAffiliated withResearch School of Earth Sciences, Australian National University, Canberra 0200, Australia e-mail: firstname.lastname@example.org
- , Wayne R. TaylorAffiliated withResearch School of Earth Sciences, Australian National University, Canberra 0200, Australia e-mail: email@example.com
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where \(\) K)). The thermometer reproduces the experimental temperatures to ±30 °C (1σ).
The uncertainties of the present formulations are comparable to, or better than, those of the most widely used thermobarometers for garnet peridotites. P-T estimates obtained for diamond-bearing and graphite-bearing lherzolite xenoliths and peridotitic clinopyroxene inclusions in kimberlitic and lamproitic diamonds confirm the reliability of the thermobarometer. Cr-diopside thermobarometry appears to be a potential tool for obtaining information on the thermal state of the upper mantle and the extent of mantle sampling by deep-seated magmas. We consider the Cr-in-Cpx barometer to be the best alternative to the Al-in-Opx barometer for the evaluation of pressure conditions of equilibration of natural garnet lherzolites. P-T conditions of equilibration can be directly retrieved from the composition of Cr-diopside alone, thus allowing application to partially altered xenoliths, inclusions in diamonds, and loose grains from sediments. We foresee application of the present thermobarometer to evaluation of the diamond potential of kimberlite and lamproite provinces and in diamond exploration where Cr-diopside from deep mantle sources is preserved in the surficial weathering environment.
- Single clinopyroxene thermobarometry for garnet peridotites. Part I. Calibration and testing of a Cr-in-Cpx barometer and an enstatite-in-Cpx thermometer
Contributions to Mineralogy and Petrology
Volume 139, Issue 5 , pp 541-554
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