Petrochemical Criteria of Staurolite Stability in Metapelites at Medium-Temperature Low- and Medium-Pressure Metamorphism

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Petrochemical Criteria of Staurolite Stability in Metapelites at Medium-Temperature Low- and Medium-Pressure Metamorphism. / Borisova, E. B.; Baltybaev, Sh K.

In: Petrology, Vol. 29, No. 4, 07.2021, p. 336-350.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{83830e513e6942eb888e6e42a8640072,

title = "Petrochemical Criteria of Staurolite Stability in Metapelites at Medium-Temperature Low- and Medium-Pressure Metamorphism",

abstract = "Abstract: Staurolite stability in rocks of zonal metamorphic complexes and the subsequent decomposition of this mineral in the rocks at increasing temperature is a criterion for distinguishing the staurolite metamorphic zone. Along with other metamorphic zones, this zone reflects the temperature distribution configuration when the metamorphic zoning was formed. Staurolite-bearing mineral assemblages are formed in metapelites of appropriate chemical composition at metamorphic temperatures of ~500–650°C. The fact that staurolite is stable within a relatively narrow temperature range makes it possible to predict the presence or absence of this mineral in rocks if representative data on the composition of their protoliths are available. We propose a method for identifying potentially staurolite-bearing rocks using computational petrochemical modules, whose values are calibrated on natural rocks and modeled rock compositions that can occur in nature. Four petrochemical modules are proposed in the form of specified proportions of major chemical components in metamorphic rocks: Al2O3/SiO2, CaO/FM (where FM = FeOt + MgO), K2O/FM, and Na2O/FM. They can be used as criteria for estimating the possibility of staurolite crystallization in rocks when a suitable temperature (and pressure) is reached. These modules make it possible to select and more reliably specify the boundaries of the staurolite zone when, for example, maps of metamorphism are produced.",

keywords = "metamorphic zoning, metamorphism, mineral assemblage, petrochemical module, staurolite",

author = "Borisova, {E. B.} and Baltybaev, {Sh K.}",

note = "Publisher Copyright: {\textcopyright} 2021, Pleiades Publishing, Ltd.",

year = "2021",

month = jul,

doi = "10.1134/S0869591121040020",

language = "English",

volume = "29",

pages = "336--350",

journal = "Petrology",

issn = "0869-5911",

publisher = "МАИК {"}Наука/Интерпериодика{"}",

number = "4",

}

RIS

TY - JOUR

T1 - Petrochemical Criteria of Staurolite Stability in Metapelites at Medium-Temperature Low- and Medium-Pressure Metamorphism

AU - Borisova, E. B.

AU - Baltybaev, Sh K.

PY - 2021/7

Y1 - 2021/7

N2 - Abstract: Staurolite stability in rocks of zonal metamorphic complexes and the subsequent decomposition of this mineral in the rocks at increasing temperature is a criterion for distinguishing the staurolite metamorphic zone. Along with other metamorphic zones, this zone reflects the temperature distribution configuration when the metamorphic zoning was formed. Staurolite-bearing mineral assemblages are formed in metapelites of appropriate chemical composition at metamorphic temperatures of ~500–650°C. The fact that staurolite is stable within a relatively narrow temperature range makes it possible to predict the presence or absence of this mineral in rocks if representative data on the composition of their protoliths are available. We propose a method for identifying potentially staurolite-bearing rocks using computational petrochemical modules, whose values are calibrated on natural rocks and modeled rock compositions that can occur in nature. Four petrochemical modules are proposed in the form of specified proportions of major chemical components in metamorphic rocks: Al2O3/SiO2, CaO/FM (where FM = FeOt + MgO), K2O/FM, and Na2O/FM. They can be used as criteria for estimating the possibility of staurolite crystallization in rocks when a suitable temperature (and pressure) is reached. These modules make it possible to select and more reliably specify the boundaries of the staurolite zone when, for example, maps of metamorphism are produced.

AB - Abstract: Staurolite stability in rocks of zonal metamorphic complexes and the subsequent decomposition of this mineral in the rocks at increasing temperature is a criterion for distinguishing the staurolite metamorphic zone. Along with other metamorphic zones, this zone reflects the temperature distribution configuration when the metamorphic zoning was formed. Staurolite-bearing mineral assemblages are formed in metapelites of appropriate chemical composition at metamorphic temperatures of ~500–650°C. The fact that staurolite is stable within a relatively narrow temperature range makes it possible to predict the presence or absence of this mineral in rocks if representative data on the composition of their protoliths are available. We propose a method for identifying potentially staurolite-bearing rocks using computational petrochemical modules, whose values are calibrated on natural rocks and modeled rock compositions that can occur in nature. Four petrochemical modules are proposed in the form of specified proportions of major chemical components in metamorphic rocks: Al2O3/SiO2, CaO/FM (where FM = FeOt + MgO), K2O/FM, and Na2O/FM. They can be used as criteria for estimating the possibility of staurolite crystallization in rocks when a suitable temperature (and pressure) is reached. These modules make it possible to select and more reliably specify the boundaries of the staurolite zone when, for example, maps of metamorphism are produced.

KW - metamorphic zoning

KW - metamorphism

KW - mineral assemblage

KW - petrochemical module

KW - staurolite

UR - http://www.scopus.com/inward/record.url?scp=85111289786&partnerID=8YFLogxK

U2 - 10.1134/S0869591121040020

DO - 10.1134/S0869591121040020

M3 - Article

AN - SCOPUS:85111289786

VL - 29

SP - 336

EP - 350

JO - Petrology

JF - Petrology

SN - 0869-5911

IS - 4

ER -

ID: 93113522