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Article: Geochemistry and U-Pb detrital zircon dating of Paleozoic graywackes in East Junggar, NW China: insights into subduction-accretion processes in the southern Central Asian Orogenic Belt
Title | Geochemistry and U-Pb detrital zircon dating of Paleozoic graywackes in East Junggar, NW China: insights into subduction-accretion processes in the southern Central Asian Orogenic Belt | ||||||||
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Authors | |||||||||
Keywords | Central asian orogenic belt Detrital zircons Junggar Provenance Tectonics | ||||||||
Issue Date | 2012 | ||||||||
Publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr | ||||||||
Citation | Gondwana Research, 2012, v. 21 n. 2-3, p. 637-653 How to Cite? | ||||||||
Abstract | The southern Central Asian Orogenic Belt (CAOB) is characterized by multiple and linear accretionary orogenic collages, including Paleozoic arcs, ophiolites, and accretionay wedges. A complex history of subduction-accretion processes makes it difficult to distinguish the origin of these various terranes and reconstruct the tectonic evolution of the southern CAOB. In order to provide constraints on the accretionary history, we analyzed major and trace element compositions of Paleozoic graywackes from the Huangcaopo Group (HG) and Kubusu Group (KG) in East Junggar. The HG graywackes have relatively low Chemical Index of Alteration (CIA) values (50 to 66), suggesting a source that underwent relatively weak chemical weathering. The identical average Index of Compositional Variability (ICV) values (1.1) for both the KG and HG samples point to an immature source for the Paleozoic graywackes in East Junggar, which is consistent with an andesitic-felsic igneous source characterized by low La/Th ratios and relatively high Hf contents. These graywackes are geochemically similar to continental island arc sediments and therefore were probably deposited at an active continental margin. U-Pb dating of detrital zircons from the lower subgroup of the HG yielded a young age peak at 440Ma, indicating a post-Early Silurian depositional age. However, the youngest populations of detrital zircons from the KG graywackes and the upper subgroup of the HG yielded 206Pb/ 238U ages of 346Ma and 355Ma, respectively, which suggest a post-Early Carboniferous depositional age. Because of similarities of rock assemblages, these two units should be incorporated into the Early Carboniferous Nanmingshui Formation. The detrital zircon age spectrum of the Early Paleozoic HG graywackes resembles that of the Habahe sediments in the Chinese Altai, which suggests that the ocean between East Junggar and the Chinese Altai was closed before the deposition of the sediments and that the Armantai ophiolite was emplaced prior to the Early Devonian. The differences in age spectra for detrital zircons from the post-Early Carboniferous graywackes in East Junggar and the Harlik arc indicate that the emplacement of the Kalamaili ophiolite postdates the Early Carboniferous. Therefore, a long-lasting northward subduction-accretion process is suggested for the formation of East Junggar and the reconstruction of the Early Paleozoic evolution of the southern CAOB. © 2011 International Association for Gondwana Research. | ||||||||
Persistent Identifier | http://hdl.handle.net/10722/151356 | ||||||||
ISSN | 2023 Impact Factor: 7.2 2023 SCImago Journal Rankings: 1.742 | ||||||||
ISI Accession Number ID |
Funding Information: We are very grateful to R.D. Nance and the three reviewers, whose polishing work and constructive comments have greatly improved the manuscript This study was supported by the National Basic Research Program of China (2007CB411308), the National Natural Science Foundation of China (NSFC 40803009, 40725009 and 40721063) and the Hong Kong RGC (HKU704307P). We express our appreciation to KJ. Hou, Y. Liu and XL Tu for their laboratory assistance. This is contribution No. IS-1345 from GIGCAS. | ||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Long, X | en_US |
dc.contributor.author | Yuan, C | en_US |
dc.contributor.author | Sun, M | en_US |
dc.contributor.author | Safonova, I | en_US |
dc.contributor.author | Xiao, W | en_US |
dc.contributor.author | Wang, Y | - |
dc.date.accessioned | 2012-06-26T06:21:04Z | - |
dc.date.available | 2012-06-26T06:21:04Z | - |
dc.date.issued | 2012 | en_US |
dc.identifier.citation | Gondwana Research, 2012, v. 21 n. 2-3, p. 637-653 | en_US |
dc.identifier.issn | 1342-937X | en_US |
dc.identifier.uri | http://hdl.handle.net/10722/151356 | - |
dc.description.abstract | The southern Central Asian Orogenic Belt (CAOB) is characterized by multiple and linear accretionary orogenic collages, including Paleozoic arcs, ophiolites, and accretionay wedges. A complex history of subduction-accretion processes makes it difficult to distinguish the origin of these various terranes and reconstruct the tectonic evolution of the southern CAOB. In order to provide constraints on the accretionary history, we analyzed major and trace element compositions of Paleozoic graywackes from the Huangcaopo Group (HG) and Kubusu Group (KG) in East Junggar. The HG graywackes have relatively low Chemical Index of Alteration (CIA) values (50 to 66), suggesting a source that underwent relatively weak chemical weathering. The identical average Index of Compositional Variability (ICV) values (1.1) for both the KG and HG samples point to an immature source for the Paleozoic graywackes in East Junggar, which is consistent with an andesitic-felsic igneous source characterized by low La/Th ratios and relatively high Hf contents. These graywackes are geochemically similar to continental island arc sediments and therefore were probably deposited at an active continental margin. U-Pb dating of detrital zircons from the lower subgroup of the HG yielded a young age peak at 440Ma, indicating a post-Early Silurian depositional age. However, the youngest populations of detrital zircons from the KG graywackes and the upper subgroup of the HG yielded 206Pb/ 238U ages of 346Ma and 355Ma, respectively, which suggest a post-Early Carboniferous depositional age. Because of similarities of rock assemblages, these two units should be incorporated into the Early Carboniferous Nanmingshui Formation. The detrital zircon age spectrum of the Early Paleozoic HG graywackes resembles that of the Habahe sediments in the Chinese Altai, which suggests that the ocean between East Junggar and the Chinese Altai was closed before the deposition of the sediments and that the Armantai ophiolite was emplaced prior to the Early Devonian. The differences in age spectra for detrital zircons from the post-Early Carboniferous graywackes in East Junggar and the Harlik arc indicate that the emplacement of the Kalamaili ophiolite postdates the Early Carboniferous. Therefore, a long-lasting northward subduction-accretion process is suggested for the formation of East Junggar and the reconstruction of the Early Paleozoic evolution of the southern CAOB. © 2011 International Association for Gondwana Research. | en_US |
dc.language | eng | en_US |
dc.publisher | Elsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/jcr | en_US |
dc.relation.ispartof | Gondwana Research | en_US |
dc.subject | Central asian orogenic belt | en_US |
dc.subject | Detrital zircons | en_US |
dc.subject | Junggar | en_US |
dc.subject | Provenance | en_US |
dc.subject | Tectonics | en_US |
dc.title | Geochemistry and U-Pb detrital zircon dating of Paleozoic graywackes in East Junggar, NW China: insights into subduction-accretion processes in the southern Central Asian Orogenic Belt | en_US |
dc.type | Article | en_US |
dc.identifier.email | Long, X: longxp@gig.ac.cn | en_US |
dc.identifier.email | Yuan, C: yuanchao@gig.ac.cn | - |
dc.identifier.email | Sun, M: minsun@hku.hk | - |
dc.identifier.authority | Sun, M=rp00780 | en_US |
dc.description.nature | link_to_subscribed_fulltext | en_US |
dc.identifier.doi | 10.1016/j.gr.2011.05.015 | en_US |
dc.identifier.scopus | eid_2-s2.0-84856213411 | en_US |
dc.identifier.hkuros | 205441 | - |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84856213411&selection=ref&src=s&origin=recordpage | en_US |
dc.identifier.volume | 21 | en_US |
dc.identifier.issue | 2-3 | en_US |
dc.identifier.spage | 637 | en_US |
dc.identifier.epage | 653 | en_US |
dc.identifier.isi | WOS:000301087300025 | - |
dc.publisher.place | Netherlands | en_US |
dc.identifier.scopusauthorid | Wang, Y=37762225700 | en_US |
dc.identifier.scopusauthorid | Xiao, W=7202456615 | en_US |
dc.identifier.scopusauthorid | Safonova, I=7003902437 | en_US |
dc.identifier.scopusauthorid | Sun, M=25932315800 | en_US |
dc.identifier.scopusauthorid | Yuan, C=35241599200 | en_US |
dc.identifier.scopusauthorid | Long, X=14012199100 | en_US |
dc.identifier.issnl | 1342-937X | - |