UHP-UHT peak conditions and near-adiabatic exhumation path of
diamond-bearing garnet-clinopyroxene rocks from the Eger
Crystalline Complex, North Bohemian Massif

J 2016

UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif

HAIFLER, Jakub a Jana KOTKOVÁ

Základní údaje

Originální název

UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif

Autoři

HAIFLER, Jakub (203 Česká republika, domácí) a Jana KOTKOVÁ (203 Česká republika, garant, domácí)

Vydání

Lithos, Elsevier, 2016, 0024-4937

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Nizozemské království

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 3.677

Kód RIV

RIV/00216224:14310/16:00087943

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1016/j.lithos.2016.02.001

UT WoS

000373863900026

Klíčová slova anglicky

Ultrahigh-pressure; Diamond; Ti-in-zircon; Granulite; Thermobarometry; Bohemian Massif

Štítky

AKR, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 14. 4. 2017 21:24, Ing. Andrea Mikešková

Anotace

V originále

Intermediate garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif, contain microdiamonds enclosed in garnet and zircon. P-T evolution of the rocks is evaluated using using univariant equilibria and thermodynamic modelling, and ternary feldspar solvus, Ti-in-garnet, Zr-in-rutile and Ti-in-zircon thermometry. Zircon mantle domains with diamond inclusions contain 111-189 ppm Ti, reflecting temperatures of 1037-1117 degrees C at c. 4.5-5.0 GPa. Ti-in-garnet thermometry using the Ti content of diamond-bearing garnet core yielded temperatures of 993-1039 degrees C at c. 5.0 GPa. An omphacite inclusion in garnet (reflecting c. 2.3-2.4 GPa at c. 1050 degrees C) and metastably preserved kyanite represent relics of eclogite-facies conditions. The dominant high-pressure granulite-facies mineral assemblage of low-Ca garnet, diopsidic clinopyroxene, antiperthitic feldspar and quartz equilibrated at 1.8-2.1 GPa and c. 1050 degrees C. Thermodynamic modelling shows that a steep rimward decrease of XGrs and increase of X-Mg in garnet reflect omphacite and kyanite breakdown reactions producing garnet and plagioclase during decompression without heating. The Ti content in the rim zone of zircon (13-42 ppm), exsolved plagioclase and K-feldspar associated with matrix diopside and garnet rim, matrix rutile grains containing 2028-4390 ppm Zr and late biotite reflect temperatures of c. 830-900 degrees C at c. 1.4 GPa. Our results show that the garnet-clinopyroxene rocks from North Bohemia are UHP-UHT rocks which were extensively overprinted under HP granulite-facies conditions during rapid exhumation along a near-adiabatic P-T path. The UHT peak and UHT-HT exhumation distinguish this area from the other UHP terrains worldwide. The calculated UHP-UHT conditions are similar to those determined for the associated garnet peridotites, providing evidence for juxtaposition of these crustal and mantle rocks during deep Variscan subduction.

Návaznosti

GA13-21450S, projekt VaV

Název: Severočeské granulity obsahující diamant a coesit: studium médií vzniku diamantu v hluboké subdukční zóně a důsledky pro geodynamické modely

Investor: Grantová agentura ČR, Severočeské granulity obsahující diamant a coesit: studium médií vzniku diamantu v hluboké subdukční zóně a důsledky pro geodynamické modely

Citovat

HAIFLER, Jakub a Jana KOTKOVÁ. UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif. Lithos. Elsevier, 2016, roč. 248, April, s. 366-381. ISSN 0024-4937. Dostupné z: https://dx.doi.org/10.1016/j.lithos.2016.02.001.

@article{1345839,
   author = {Haifler, Jakub and Kotková, Jana},
   article_number = {April},
   doi = {http://dx.doi.org/10.1016/j.lithos.2016.02.001},
   keywords = {Ultrahigh-pressure; Diamond; Ti-in-zircon; Granulite; Thermobarometry; Bohemian Massif},
   language = {eng},
   issn = {0024-4937},
   journal = {Lithos},
   title = {UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif},
   url = {http://www.sciencedirect.com/science/article/pii/S0024493716000621},
   volume = {248},
   year = {2016}
}

TY  - JOUR
ID  - 1345839
AU  - Haifler, Jakub - Kotková, Jana
PY  - 2016
TI  - UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif
JF  - Lithos
VL  - 248
IS  - April
SP  - 366-381
EP  - 366-381
PB  - Elsevier
SN  - 00244937
KW  - Ultrahigh-pressure
KW  - Diamond
KW  - Ti-in-zircon
KW  - Granulite
KW  - Thermobarometry
KW  - Bohemian Massif
UR  - http://www.sciencedirect.com/science/article/pii/S0024493716000621
L2  - http://www.sciencedirect.com/science/article/pii/S0024493716000621
N2  - Intermediate garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif, contain microdiamonds enclosed in garnet and zircon. P-T evolution of the rocks is evaluated using using univariant equilibria and thermodynamic modelling, and ternary feldspar solvus, Ti-in-garnet, Zr-in-rutile and Ti-in-zircon thermometry. Zircon mantle domains with diamond inclusions contain 111-189 ppm Ti, reflecting temperatures of 1037-1117 degrees C at c. 4.5-5.0 GPa. Ti-in-garnet thermometry using the Ti content of diamond-bearing garnet core yielded temperatures of 993-1039 degrees C at c. 5.0 GPa. An omphacite inclusion in garnet (reflecting c. 2.3-2.4 GPa at c. 1050 degrees C) and metastably preserved kyanite represent relics of eclogite-facies conditions. The dominant high-pressure granulite-facies mineral assemblage of low-Ca garnet, diopsidic clinopyroxene, antiperthitic feldspar and quartz equilibrated at 1.8-2.1 GPa and c. 1050 degrees C. Thermodynamic modelling shows that a steep rimward decrease of XGrs and increase of X-Mg in garnet reflect omphacite and kyanite breakdown reactions producing garnet and plagioclase during decompression without heating. The Ti content in the rim zone of zircon (13-42 ppm), exsolved plagioclase and K-feldspar associated with matrix diopside and garnet rim, matrix rutile grains containing 2028-4390 ppm Zr and late biotite reflect temperatures of c. 830-900 degrees C at c. 1.4 GPa. Our results show that the garnet-clinopyroxene rocks from North Bohemia are UHP-UHT rocks which were extensively overprinted under HP granulite-facies conditions during rapid exhumation along a near-adiabatic P-T path. The UHT peak and UHT-HT exhumation distinguish this area from the other UHP terrains worldwide. The calculated UHP-UHT conditions are similar to those determined for the associated garnet peridotites, providing evidence for juxtaposition of these crustal and mantle rocks during deep Variscan subduction.
ER  -

HAIFLER, Jakub a Jana KOTKOVÁ. UHP-UHT peak conditions and near-adiabatic exhumation path of diamond-bearing garnet-clinopyroxene rocks from the Eger Crystalline Complex, North Bohemian Massif. \textit{Lithos}. Elsevier, 2016, roč.~248, April, s.~366-381. ISSN~0024-4937. Dostupné z: https://dx.doi.org/10.1016/j.lithos.2016.02.001.

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