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Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya
Li, Rui1,2,3,4; Ao, Songjian4,5; Xiao, Wenjiao1,2,3,4; Schulmann, Karel6; Mao, Qigui1,2,3,4; Song, Dongfang4,5; Tan, Zhou1,2,3,4; Wang, Hao1,2,3,4; Bhandari, Saunak7
2022-05-12
Source PublicationFRONTIERS IN EARTH SCIENCE
Volume10Pages:15
AbstractThe tectonic evolution of the Himalayan orogenic belt before Cenozoic convergence is important to understand its modern structural framework. There is still controversy regarding the tectonic history of the lower Lesser Himalaya Sequence (LHS) in the frame of 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 LHS and the Main Central Thrust zone in the Arun Valley, eastern Nepal, to address their Precambrian tectonic evolution and the later convergence. Two groups of metasedimentary rocks with different age spectrums of detrital zircons and Hf isotope in the Paleoproterozoic can be distinguished in an imbricated duplexing system in the study area. One group with a maximum depositional age around ca. 1800 Ma has a unimodal detrital zircon pattern and negative zircon sigma(Hf) (t) values ranging from -8.9 to 0.9. These data can be interpreted to reflect the deposition of zircons close to a Japanese-type arc that was isolated from the northern Indian Craton. The other group of calc-silicate rocks and quartzite with multiple peaks of detrital zircons in the Paleoproterozoic show a younger maximum depositional age around ca. 1,600 Ma and variable zircon sigma(Hf) (t) values ranging from -6.7 to 8.8, indicating their deposition in a back-arc basin of an Andean-type arc established on the northern Indian Craton. The geochemistry of an orthogneiss sample dated at 1783 +/- 11 Ma indicates high potassium, peraluminous granodiorite protolith emplaced in a volcanic arc or syn-collisional tectonic setting, supporting the existence of the Paleoproterozoic Andean-type arc. We hypothesize that possibly two arc systems developed, respectively, onto and in the proximity of northern Indian Craton in the Paleoproterozoic at the final stages of the Columbia supercontinent formation. These two arcs were juxtaposed either in the Paleoproterozoic or Cenozoic time, and were finally imbricated during the Cenozoic duplexing.
KeywordCenozoic duplexing eastern Nepalese Himalaya Paleoproterozoic arcs zircon U-Pb age zircon Hf
DOI10.3389/feart.2022.890171
WOS KeywordCENTRAL THRUST ZONE ; IN-SITU ANALYSIS ; U-PB ; TRACE-ELEMENT ; HF ISOTOPES ; LU-HF ; ZIRCON ; EVOLUTION ; INDIA ; DISCRIMINATION
Language英语
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000803549000001
PublisherFRONTIERS MEDIA SA
Citation statistics
Document Type期刊论文
Identifierhttp://ir.iggcas.ac.cn/handle/132A11/105998
Collection岩石圈演化国家重点实验室
Corresponding AuthorLi, Rui; Xiao, Wenjiao
Affiliation1.Chinese Acad Sci, Xinjiang Inst Ecol & Geog, State Key Lab Desert & Oasis Ecol, Urumqi, Peoples R China
2.Xinjiang Key Lab Mineral Resources & Digital Geol, Urumqi, Peoples R China
3.Univ Chinese Acad Sci, Coll Earth & Planetary Sci, Beijing, Peoples R China
4.Innovat Acad Earth Sci, Chinese Acad Sci, Beijing, Peoples R China
5.Chinese Acad Sci, Inst Geol & Geophys, State Key Lab Lithospher Evolut, Beijing, Peoples R China
6.Czech Geol Survey, Ctr Lithospher Res, Prague, Czech Republic
7.Govt Nepal, Dept Mines & Geol, Kathmandu, Nepal
Recommended Citation
GB/T 7714
Li, Rui,Ao, Songjian,Xiao, Wenjiao,et al. Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya[J]. FRONTIERS IN EARTH SCIENCE,2022,10:15.
APA Li, Rui.,Ao, Songjian.,Xiao, Wenjiao.,Schulmann, Karel.,Mao, Qigui.,...&Bhandari, Saunak.(2022).Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya.FRONTIERS IN EARTH SCIENCE,10,15.
MLA Li, Rui,et al."Tectonic Juxtaposition of Two Independent Paleoproterozoic Arcs by Cenozoic Duplexing in the Arun Tectonic Window of the Eastern Nepalese Himalaya".FRONTIERS IN EARTH SCIENCE 10(2022):15.
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