The Kabul Block (Afghanistan), a segment of the Columbia Supercontinent, with a Neoproterozoic metamorphic overprint

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F16%3A10331669" target="_blank" >RIV/00216208:11310/16:10331669 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216224:14310/16:00094064

Výsledek na webu

<a href="http://dx.doi.org/10.1016/j.gr.2015.02.019" target="_blank" >http://dx.doi.org/10.1016/j.gr.2015.02.019</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.gr.2015.02.019" target="_blank" >10.1016/j.gr.2015.02.019</a>

Jazyk výsledku

angličtina

Název v původním jazyce

The Kabul Block (Afghanistan), a segment of the Columbia Supercontinent, with a Neoproterozoic metamorphic overprint

Popis výsledku v původním jazyce

We report field relationships, petrography and isotopic ages from two superposed basement units of the Kabul Block, the so called Lower Sherdarwaza and Upper Welayati formations. The Sherdarwaza Formation is represented mostly by migmatites and gneisses that are derived from pelitic and psammitic lithologies with lenses and layers of mafic and carbonate rocks. Several bodies of orthogneisses are also exposed in the Sherdarwaza Formation. The Upper Welayati Formation is characterized by micaschist, quartzite and amphibolites. SHRIMP U-Pb data on zircon from the orthogneiss in the Sherdarwaza Formation indicates a Neoarchean age of ca 25-2.8 Ga for their magmatic crystallization. The rocks exhibit granulite facies conditions of 5-7 kbar and 800 degrees C that are documented by the presence of orthopyroxene and Ti-rich biotite in the orthogneiss and by olivine and phlogopite in some talc-silicate rocks at contact with marble. A Paleoproterozoic age of ca. 1.85-1.80 Ga for this metamorphism was obtained using U-Pb SHRIMP dating on zircon and U-Th dating on monazite. Mineral textural relations also show a younger amphibolite facies metamorphism that is documented in both the Sherdarwaza and Welayati formations. This metamorphism occurred at relatively higher pressure conditions of up to 9 kbar at ca. 650 degrees C, compared to the granulite facies event. A Neoproterozoic age of ca 0.85-0.9 Ga, for this metamorphism is confirmed by Ar-Ar data on biotite and white mica as well as by U-Th data on monazite.

Název v anglickém jazyce

The Kabul Block (Afghanistan), a segment of the Columbia Supercontinent, with a Neoproterozoic metamorphic overprint

Popis výsledku anglicky

We report field relationships, petrography and isotopic ages from two superposed basement units of the Kabul Block, the so called Lower Sherdarwaza and Upper Welayati formations. The Sherdarwaza Formation is represented mostly by migmatites and gneisses that are derived from pelitic and psammitic lithologies with lenses and layers of mafic and carbonate rocks. Several bodies of orthogneisses are also exposed in the Sherdarwaza Formation. The Upper Welayati Formation is characterized by micaschist, quartzite and amphibolites. SHRIMP U-Pb data on zircon from the orthogneiss in the Sherdarwaza Formation indicates a Neoarchean age of ca 25-2.8 Ga for their magmatic crystallization. The rocks exhibit granulite facies conditions of 5-7 kbar and 800 degrees C that are documented by the presence of orthopyroxene and Ti-rich biotite in the orthogneiss and by olivine and phlogopite in some talc-silicate rocks at contact with marble. A Paleoproterozoic age of ca. 1.85-1.80 Ga for this metamorphism was obtained using U-Pb SHRIMP dating on zircon and U-Th dating on monazite. Mineral textural relations also show a younger amphibolite facies metamorphism that is documented in both the Sherdarwaza and Welayati formations. This metamorphism occurred at relatively higher pressure conditions of up to 9 kbar at ca. 650 degrees C, compared to the granulite facies event. A Neoproterozoic age of ca 0.85-0.9 Ga, for this metamorphism is confirmed by Ar-Ar data on biotite and white mica as well as by U-Th data on monazite.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

DB - Geologie a mineralogie

OECD FORD obor

—

Projekt

<a href="/cs/project/GAP210%2F10%2F0249" target="_blank" >GAP210/10/0249: Vývoj raní konvergence a exhumace ultravysokotlakých litologií ve variském orogénu</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Gondwana Research

ISSN

1342-937X

e-ISSN

—

Svazek periodika

34

Číslo periodika v rámci svazku

1 June 2016

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

20

Strana od-do

221-240

Kód UT WoS článku

000384702600015

EID výsledku v databázi Scopus

2-s2.0-84928243178