Garnet–orthopyroxene (GOPX) geothermometer: a comparative study

Thomas, Harel; Rana, Haritabh; Shahid, Mohammad

doi:10.1007/s12517-018-4060-y

Cited by 5 publications

(6 citation statements)

References 28 publications

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“…To test the validity and applicability of garentcordierite (Gt-Crd) thermometry, we have collected 70 samples (60 of granulites and 10 of UHT/UHP) from the literature all over the world. Selection of samples fit the following criteria (Wu and Cheng, 2006;Thomas et al, 2018;Thomas and Rana, 2019):…”

Section: Valid Gcrd Geothermometry In Granulitesmentioning

confidence: 99%

“…The validity of a thermometer is a prerequisite in the study of metamorphism. Several thermobarometric studies had been undertaken in the past few years, which led to the development of a range of thermometers and barometers, such as garnet-biotite thermometer (Wu and Cheng, 2006;Thomas and Rana, 2019), garnetclinopyroxene thermometer (Jahnson et al, 1983;Fu et al, 1998), garnet-orthopyroxene thermometer (Thomas et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

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Applicability of garnet-cordierite (Gt-Crd) geothermometer

Thomas

Rana

Mishra

2020

Journal of Nepal Geological Society

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The garnet-cordierite pairs are commonly found in the assemblages of granulites and hence are suitable for estimating equilibrium temperature of these metamorphic rocks. At present, there are many calibrations of garnet - cordierite (Gt-Crd) thermometer that may confuse geologists in choosing a reliable thermometer. To test the accuracy of the garnet - cordierite thermometers, we have applied eleven models formulated by a number of researchers since (1976) till date. We have collected 70 samples from the literature all over the world, which has been processed through “Gt-Crd.EXE” software. Based on the present study, we have identified a set of the best among all the eleven models which were considered under this comparative study. We have concluded that the five garnet-cordierite thermometers are the most valid and reliable of this kind of thermometer (Holdaway and Lee, 1977; Perchuk et al. 1985; Thompson, 1976; Wells,1979 and Aranovich and Podlesskii ,1989).

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Section: Valid Gcrd Geothermometry In Granulitesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Applicability of garnet-cordierite (Gt-Crd) geothermometer

Thomas

Rana

Mishra

2020

Journal of Nepal Geological Society

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“…Several thermobarometric studies have been undertaken over the years, which led to the development of a range of thermometers and barometers, such as garnetclinopyroxene thermometry [1,2], garnet-orthopyroxene thermometry [3], garnetbiotite thermometry [4,5], garnet-hornblende thermometry [6], garnet cordierite thermometry [7], and two pyroxene thermometry [8].…”

Section: Introductionmentioning

confidence: 99%

An Evaluation of Garnet – Clinopyroxene Geothermometer

Thomas,

Rana

2024

Metamorphic Rocks as the Key to Understanding Geodynamic Processes

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The garnet-clinopyroxene pair commonly found in upper amphibolite, granulite, and eclogite facies assemblage, as well as in garnet peridotites serves as a basic tool to estimate the equilibrium temperature for these metamorphic rocks. Several empirical and experimental calibrations for garnet-clinopyroxene thermometers have been proposed in the last four decades. Due to several calibrations for this pair, scholars often find difficulty in choosing the most optimum and valid thermometer. In the present study, eleven garnet-clinopyroxene thermometers formulated since 1972 have been evaluated to find the most valid thermometer checked on 89 sample data collated from the published global literature and processed through Gt-Cpx.Exe software. The authors used the relationship of LnKD versus the inverse of temperature and regression values. Out of the eleven geothermometer models, five models showing highest regression values with clustering of data at smaller ranges and less deviation for the collated data have been considered the best one: Raheim and Green (Contributions to Mineralogy and Petrology 48: 179–203, 1974); Mysen and Heier (Contributions to Mineralogy and Petrology 36: 73–94, 1972); Jun Lui (International Geology Review 40: 579–608, 1998); Ganguly and Saxena (Minerals Rocks 19: 1–291, 1987) and Ganguly (Geochimica et Cosmochimica Acta, 43: 1021–1029, 1979).

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“…Several models for two pyroxene (Opx-Cpx) thermometers have been proposed in recent decades. Numerous thermobarometric studies undertaken over the last few decades led to the development of a range of thermometers and barometers, such as garnet-clinopyroxene thermometry (Johnson et al, 1983;Fu et al, 1998), garnet-orthopyroxene thermometry (Thomas et al, 2018), garnet -biotite thermometry (Thomas and Rana, 2019), garnet -cordierite thermometry , clinopyroxene is the basis of widely used geothermometers for deep-seated mantle rocks and high grade crustal terrains, mainly granulites and garnet peridotites. Its correct determination is thus crucial for estimating pressure temperature distributions in the earth's crust and mantle.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of two (opx-cpx) pyroxene Geothermometer

Thomas,

Shukla,

Rana

et al. 2023

Journal of Nepal Geological Society

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In the last few decades, for estimation of the original equilibrium conditions of the mantle and deep crustal rocks, several empirical as well as synthetic thermometers have been proposed. Various types of rocks from earth, moon or meteorites contain two coexisting pyroxenes. Petrologists have long recognised the potential of coexisting high Ca and low Ca pyroxenes to yield thermometric calculations. Several models have been proposed for two pyroxene thermometers in the last few decades. The authors have compared ten models of two pyroxene thermometers proposed since 1973. Sixty one (61) sample data of granulites from the global literature were collected and processed through the “Opx-Cpx.EXE” software. We conclude that three models are the most valid and reliable of this kinds of thermometers: Kretz (1982), Bertrend and Mercier (1985) and Nickel and Green (1985).

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Garnet–orthopyroxene (GOPX) geothermometer: a comparative study

Cited by 5 publications

References 28 publications

Applicability of garnet-cordierite (Gt-Crd) geothermometer

Applicability of garnet-cordierite (Gt-Crd) geothermometer

An Evaluation of Garnet – Clinopyroxene Geothermometer

Evaluation of two (opx-cpx) pyroxene Geothermometer

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