Petrologic study of the eclogite xenoliths in fengzhen carbonatite, North China Craton: Evidence for the start of modern-style plate tectonic regime in Paleoproterozoic

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F21%3APU142286" target="_blank" >RIV/00216305:26620/21:PU142286 - isvavai.cz</a>

Result on the web

<a href="https://www.researchgate.net/publication/350819645_Petrologic_study_of_the_eclogite_xenoliths_in_fengzhen_carbonatite_North_China_Craton_Evidence_for_the_start_of_modern-style_plate_tectonic_regime_in_Paleoproterozoic" target="_blank" >https://www.researchgate.net/publication/350819645_Petrologic_study_of_the_eclogite_xenoliths_in_fengzhen_carbonatite_North_China_Craton_Evidence_for_the_start_of_modern-style_plate_tectonic_regime_in_Paleoproterozoic</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.18654/1000-0569/2021.02.05" target="_blank" >10.18654/1000-0569/2021.02.05</a>

Result language

angličtina

Original language name

Petrologic study of the eclogite xenoliths in fengzhen carbonatite, North China Craton: Evidence for the start of modern-style plate tectonic regime in Paleoproterozoic

Original language description

The onset of modern plate tectonic regime on Earth became increasingly controversial in recent years because of the lack of continuously newly found records of subduction and collision. Here, we present the study of the ultra-high pressure eclogite xenoliths in the Paleoproterozoic Fengzhen carbonatite complex, including the garnet-rich (Fz-2) and the omphacite-rich (Fz-16) samples. All samples are collected from the same site and exhibit identical mineral chemistry and textures. The xenoliths display whole-rock compositions indicative of the protoliths of oceanic gabbro. At least two metamorphic stages are recognized in these eclogites epidote/amphibole-eclogite stage M1 and lawsonite-eclogite stage M2. Coesite pseudomorph within radial cracks occurs as inclusions in garnet and omphacite. Columnar lawsonite pseudomorph as aggregates of coexisted kyanite and zoisite occasionally present as inclusion in garnet. The porphyroblastic garnet exhibits an inclusion-rich core and an inclusion-poor rim. The garnet displays compositional zoning, with the increasing pyrope and decreasing almandine content from core to rim. The phase equilibria modeling records the prograde path from amphibole-eclogite phase to lawsonite eclogite phase, at pressure and temperature of 2.6 similar to 3.7GPa and 655 similar to 670 degrees C, recorded from garnet zonation. The garnet-omphacite-phengite-kyanite-quartz thermobarometry yields a pressure and temperature of 3.0GPa and 734 degrees C. The Zr-in-rutile thermometer also gives a similar temperature range of 601 similar to 685 degrees C at 2.6 similar to 3.7GPa. The coesite and lawsonite pseudomorphs within the garnet and omphacite support the existence of the lawsonite-eclogite stage, representing the oldest record of low temperature ultra-high pressure metamorphic rock in the world. With a thermal gradient of 216 +/- 35 degrees C/GPa, the eclogite rocks supports the onset of modern-style cold subduction prior to similar to 1.8Ga.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

ACTA PETROLOGICA SINICA

ISSN

1000-0569

e-ISSN

2095-8927

Volume of the periodical

37

Issue of the periodical within the volume

2

Country of publishing house

CN - CHINA

Number of pages

26

Pages from-to

391-416

UT code for WoS article

000629649100005

EID of the result in the Scopus database

2-s2.0-85122735229