Petrogenesis and tectonic implication of Paleoproterozoic granites and granulites in the Fengzhen area of North China craton
Identifikátory výsledku
Kód výsledku v 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>
Nalezeny alternativní kódy
RIV/00216305:26620/17:PU136044
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>
Alternativní jazyky
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.
Klasifikace
Druh
J<sub>imp</sub> - Článek v periodiku v databázi Web of Science
CEP obor
—
OECD FORD obor
10505 - Geology
Návaznosti výsledku
Projekt
—
Návaznosti
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Ostatní
Rok uplatnění
2017
Kód důvěrnosti údajů
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Údaje specifické pro druh výsledku
Název periodika
Precambrian Research
ISSN
0301-9268
e-ISSN
—
Svazek periodika
302
Číslo periodika v rámci svazku
November
Stát vydavatele periodika
NL - Nizozemsko
Počet stran výsledku
14
Strana od-do
298-311
Kód UT WoS článku
000415908200016
EID výsledku v databázi Scopus
2-s2.0-85032736391