Significance of Zr-in-Rutile Thermometry for Deducing the Decompression P–T Path of a Garnet–Clinopyroxene Granulite in the Moldanubian Zone of the Bohemian Massif

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F17%3A00480051" target="_blank" >RIV/67985831:_____/17:00480051 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1093/petrology/egx050" target="_blank" >http://dx.doi.org/10.1093/petrology/egx050</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1093/petrology/egx050" target="_blank" >10.1093/petrology/egx050</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Significance of Zr-in-Rutile Thermometry for Deducing the Decompression P–T Path of a Garnet–Clinopyroxene Granulite in the Moldanubian Zone of the Bohemian Massif

Popis výsledku v původním jazyce

We apply Zr-in-rutile thermometry to a garnet-clinopyroxene (Grt-Cpx) granulite from the Moldanubian Zone of the Bohemian Massif. Three major metamorphic evolutionary stages are identified from the Grt-Cpx granulite. Application of Zr-in-rutile thermometry yields a temperature of ~830 °C at ~1.8 GPa for the early HP stage of granulite evolution. Rutile grains in the clinopyroxene-plagioclase domain of the matrix generally occur as small euhedral crystals and have higher Zr contents, corresponding to 1000–1050 °C at ~1.2 GPa using Zr-in-rutile thermometry. In contrast, those in the quartz-feldspar domains of the matrix occur as coarser and more elongated grains with lower Zr contents, yielding slightly lower temperatures. Si and Zr X-ray compositional mapping by electron microprobe reveals that rutile grains in both the domains were formed in quartz-bearing but zircon-free conditions. Thus, the Zr-in-rutile temperatures obtained for rutile grains in the matrix indicate the minimum estimates. Based on these results, we reveal that the studied Grt-Cpx granulite underwent significant heating by about 200 °C during the early stage of decompression from the peak pressure. This heating was caused by incorporation of the Grt-Cpx granulite into higher temperature felsic granulites rapidly exhumed from deeper parts of the continental collision zone.

Název v anglickém jazyce

Significance of Zr-in-Rutile Thermometry for Deducing the Decompression P–T Path of a Garnet–Clinopyroxene Granulite in the Moldanubian Zone of the Bohemian Massif

Popis výsledku anglicky

We apply Zr-in-rutile thermometry to a garnet-clinopyroxene (Grt-Cpx) granulite from the Moldanubian Zone of the Bohemian Massif. Three major metamorphic evolutionary stages are identified from the Grt-Cpx granulite. Application of Zr-in-rutile thermometry yields a temperature of ~830 °C at ~1.8 GPa for the early HP stage of granulite evolution. Rutile grains in the clinopyroxene-plagioclase domain of the matrix generally occur as small euhedral crystals and have higher Zr contents, corresponding to 1000–1050 °C at ~1.2 GPa using Zr-in-rutile thermometry. In contrast, those in the quartz-feldspar domains of the matrix occur as coarser and more elongated grains with lower Zr contents, yielding slightly lower temperatures. Si and Zr X-ray compositional mapping by electron microprobe reveals that rutile grains in both the domains were formed in quartz-bearing but zircon-free conditions. Thus, the Zr-in-rutile temperatures obtained for rutile grains in the matrix indicate the minimum estimates. Based on these results, we reveal that the studied Grt-Cpx granulite underwent significant heating by about 200 °C during the early stage of decompression from the peak pressure. This heating was caused by incorporation of the Grt-Cpx granulite into higher temperature felsic granulites rapidly exhumed from deeper parts of the continental collision zone.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10505 - Geology

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2017

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Petrology

ISSN

0022-3530

e-ISSN

—

Svazek periodika

58

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

GB - Spojené království Velké Británie a Severního Irska

Počet stran výsledku

26

Strana od-do

1173-1198

Kód UT WoS článku

000412822200006

EID výsledku v databázi Scopus

2-s2.0-85037833198