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

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F17%3APU136044" target="_blank" >RIV/00216305:26620/17:PU136044 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/62156489:43410/17:43913048

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

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

PRECAMBRIAN RESEARCH

ISSN

0301-9268

e-ISSN

1872-7433

Svazek periodika

302

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

14

Strana od-do

298-311

Kód UT WoS článku

000415908200016

EID výsledku v databázi Scopus

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