Petrogenesis and tectonic implication of Paleoproterozoic granites and granulites in the Fengzhen area of North China craton

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F62156489%3A43410%2F17%3A43913048" target="_blank" >RIV/62156489:43410/17:43913048 - isvavai.cz</a>

Alternative codes found

RIV/00216305:26620/17:PU136044

Result on the web

<a href="https://doi.org/10.1016/j.precamres.2017.10.015" target="_blank" >https://doi.org/10.1016/j.precamres.2017.10.015</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.precamres.2017.10.015" target="_blank" >10.1016/j.precamres.2017.10.015</a>

Result language

angličtina

Original language name

Petrogenesis and tectonic implication of Paleoproterozoic granites and granulites in the Fengzhen area of North China craton

Original language description

The North China Craton (NCC) is one of the oldest cratons in the world that preserves the records of many important geological events in the early evolution of the Earth. However, the early Precambrian tectonic evolution history of the NCC is still controversial. Here we report Paleoproterozoic leucogranites, garnet granites and granulites in the Fengzhen area that constitutes a junction between the Khondalite Belt and the Trans-North China Orogen (TNCO). The leucogranites have high SiO2 content (75-85 wt%), and magmatic zircon U-Pb age of 2199 +/- 3 Ma. Their zircons have slightly various epsilon Hf-(t) values (-0.45 to 1.41) with T-DM model ages of 2.5-2.6 Ga. The granites show strong LREE enrichment with La/Yb-cn ratio of 12-176, and have high initial Nd isotope (epsilon(Nd(t)) = 3.5-4.5). Most of them display positive Eu anomaly, excluding fractional crystallization contribution on the high Si feature. The leucogranite was produced by melting of Late Archean felsic TTGs (tonalite-trondhjemite-granodiorite) and addition of juvenile crust. Magmatic zircons yield the garnet granite age of 2002 3 Ma. The zircons show various epsilon Hf-(t) values (-5.8 to 7.1) and T-DM model ages (2.1-2.6 Ga). Low initial epsilon(Nd(t)) isotope value (-4.2 to-8.3) was determined in the granites. The granulites are high pressure metamorphic rocks with a peak pressure of 12.0 +/- 0.8 kbar, and have similar metamorphic age of 1967 10 Ma to the garnet granites. This indicates that the Fengzhen area underwent 2-Ga inter-continental orogeny, in which the melting of sedimentary rock formed the garnet granites. Similarly, sodic TTG melting to form K-rich leucogranites also needs high pressure. However, the leucogranite age is obviously older than the peak metamorphic timing of continent-continent collision. This implies that the Fengzhen area may have underwent arc-continental collision at 2.2 Ga.

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

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OECD FORD branch

10505 - Geology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

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

Name of the periodical

Precambrian Research

ISSN

0301-9268

e-ISSN

—

Volume of the periodical

302

Issue of the periodical within the volume

November

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

14

Pages from-to

298-311

UT code for WoS article

000415908200016

EID of the result in the Scopus database

2-s2.0-85032736391