Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000159" target="_blank" >RIV/00025798:_____/22:00000159 - isvavai.cz</a>
Result on the web
<a href="https://www.frontiersin.org/articles/10.3389/feart.2022.890171/full" target="_blank" >https://www.frontiersin.org/articles/10.3389/feart.2022.890171/full</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3389/feart.2022.890171" target="_blank" >10.3389/feart.2022.890171</a>
Alternative languages
Result language
angličtina
Original language name
Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya
Original language description
The tectonic evolution of the Himalayan orogenic belt before Cenozoic convergence isimportant to understand its modern structural framework. There is still controversyregarding the tectonic history of the lower Lesser Himalaya Sequence (LHS) in the frameof the Paleoproterozoic geological record. In this study, integrated analysis of field geology,zircon U-Pb age, Hf isotope, and whole-rock geochemistry was conducted across the LHSand the Main Central Thrust zone in the Arun Valley, eastern Nepal, to address theirPrecambrian tectonic evolution and the later convergence. Two groups ofmetasedimentary rocks with different age spectrums of detrital zircons and Hf isotope inthe Paleoproterozoic can be distinguished in an imbricated duplexing system in the study area.One group with a maximum depositional age around ca. 1800Ma has a unimodal detritalzircon pattern and negative zircon ƐHf (t) values ranging from −8.9 to 0.9. These data can beinterpreted to reflect the deposition of zircons close to a Japanese-type arc that was isolatedfrom the northern Indian Craton. The other group of calc-silicate rocks and quartzite withmultiple peaks of detrital zircons in the Paleoproterozoic show a younger maximumdepositional age around ca. 1,600Ma and variable zircon ƐHf (t) values ranging from −6.7to 8.8, indicating their deposition in a back-arc basin of an Andean-type arc established on thenorthern Indian Craton. The geochemistry of an orthogneiss sample dated at 1783 ± 11Maindicates high potassium, peraluminous granodiorite protolith emplaced in a volcanic arc orsyn-collisional tectonic setting, supporting the existence of the Paleoproterozoic Andean-typearc. We hypothesize that possibly two arc systems developed, respectively, onto and in theproximity of northern Indian Craton in the Paleoproterozoic at the final stages of the Columbiasupercontinent formation. These two arcs were juxtaposed either in the Paleoproterozoic orCenozoic time, and were finally imbricated during the Cenozoic duplexing.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - 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
Result continuities
Project
<a href="/en/project/GX19-27682X" target="_blank" >GX19-27682X: Principal mechanisms of peripheral continental growth during supercontinent cycle</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Others
Publication year
2022
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Frontiers in Earth Science
ISSN
2296-6463
e-ISSN
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Volume of the periodical
10
Issue of the periodical within the volume
May : 890171
Country of publishing house
CH - SWITZERLAND
Number of pages
15
Pages from-to
nestránkováno
UT code for WoS article
000803549000001
EID of the result in the Scopus database
2-s2.0-85131153282