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Article: Early Paleozoic sedimentary record of the Chinese Altai: Implications for its tectonic evolution

TitleEarly Paleozoic sedimentary record of the Chinese Altai: Implications for its tectonic evolution
Authors
KeywordsAltai
Geochemistry
Metasedimentary rocks
Sedimentary provenance
Tectonic evolution
Issue Date2008
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/sedgeo
Citation
Sedimentary Geology, 2008, v. 208 n. 3-4, p. 88-100 How to Cite?
AbstractThe Chinese Altai is a typical part of the Central Asian Orogenic Belt (CAOB), but its tectonic evolution is not well understood. Geochemical study of Early Paleozoic metasedimentary rocks was conducted to better constrain their provenance and tectonic environment. These rocks have relatively low CIA values (49 to 79), with ICV values (0.73-1.36) higher than that of post-Archean Australian average shale (PAAS), suggesting that they experienced relatively weak chemical weathering and were mainly derived from an immature source. Compared to PAAS and upper crust, the samples mostly have relatively lower high field strength elements (HFSE) (e.g. Zr, Hf, Nb, Ta) and large ion lithophile element (LILE) contents (e.g. Rb, Sr, Ba, Th, U, Pb). However, their relatively high Rb concentrations (> 40 ppm), low Rb/Sr (0.04-3.24) and Th/U (Th/U = 3-8) ratios are indicative of an acidic-intermediate igneous source that had undergone weak chemical weathering. All of the samples are moderately enriched in LREE (light REE) and show relatively flat Chondrite-normalized HREE (heavy REE) patterns (La N/Yb N = 3.2-12.6) with various negative Eu anomalies (Eu/Eu* = 0.4-0.9). Meta-arenaceous samples have moderate SiO 2 (average 72.9 wt.%), Al 2O 3 (average 11.5 wt.%), Fe 2O 3 T + MgO (average 7.16 wt.%) contents and moderate Al 2O 3/SiO 2 (average 0.16), K 2O/Na 2O (average 0.93) ratios, similar to those of graywackes from continental island arcs or active continental margins. However, meta-argillaceous samples have high SiO 2 (average 60.8 wt.%), Al 2O 3 (average 17.2 wt.%), Fe 2O 3 T + MgO (average 12.2 wt.%) contents and high K 2O/Na 2O (average 3.45), Al 2O 3/SiO 2 (average 0.28) ratios similar to mudstones from continental arc basins. This kind of tectonic environment is also manifested in tectonic discrimination diagrams including Th-Sc-Zr/10 and La-Th-Sc. These geochemical characteristics suggest that the metasedimentary rocks were deposited in an active continental margin or continental arc setting. This does not favor the previously proposed passive continental margin model. Therefore, this study supports an arc accretion model for the Chinese Altai. © 2008 Elsevier B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/58693
ISSN
2015 Impact Factor: 2.236
2015 SCImago Journal Rankings: 1.513
ISI Accession Number ID
Funding AgencyGrant Number
National Basic Research Program of China2007CB411308
Hong Kong RGCHKU7040/04P
HKU704307P
National Natural Science Foundation of China40772130,40572043
HKU Research200711159058
Chinese Academy of Sciences Innovation ProjectGIGCX-07-03
CAS/ SAFEA International Partnership Program
Funding Information:

This study was supported by National Basic Research Program of China (2007CB411308), Hong Kong RGC Grants (HKU7040/04P and HKU704307P), National Natural Science Foundation of China (40772130,40572043), HKU Research Grant (200711159058), Chinese Academy of Sciences Innovation Project (GIGCX-07-03) and CAS/ SAFEA International Partnership Program for Creative Research Teams. We thank B.P. Roser and R.L. Cullers for their constructive suggestions, which have greatly improved the manuscript. We also thank Paul Robinson for his polishing work and X.P. Xia, Y.H. He, K. Wong, J. Wong and H.Y. Geng for laboratory assistance.

References

 

DC FieldValueLanguage
dc.contributor.authorLong, Xen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorYuan, Cen_HK
dc.contributor.authorXiao, Wen_HK
dc.contributor.authorCai, Ken_HK
dc.date.accessioned2010-05-31T03:35:08Z-
dc.date.available2010-05-31T03:35:08Z-
dc.date.issued2008en_HK
dc.identifier.citationSedimentary Geology, 2008, v. 208 n. 3-4, p. 88-100en_HK
dc.identifier.issn0037-0738en_HK
dc.identifier.urihttp://hdl.handle.net/10722/58693-
dc.description.abstractThe Chinese Altai is a typical part of the Central Asian Orogenic Belt (CAOB), but its tectonic evolution is not well understood. Geochemical study of Early Paleozoic metasedimentary rocks was conducted to better constrain their provenance and tectonic environment. These rocks have relatively low CIA values (49 to 79), with ICV values (0.73-1.36) higher than that of post-Archean Australian average shale (PAAS), suggesting that they experienced relatively weak chemical weathering and were mainly derived from an immature source. Compared to PAAS and upper crust, the samples mostly have relatively lower high field strength elements (HFSE) (e.g. Zr, Hf, Nb, Ta) and large ion lithophile element (LILE) contents (e.g. Rb, Sr, Ba, Th, U, Pb). However, their relatively high Rb concentrations (> 40 ppm), low Rb/Sr (0.04-3.24) and Th/U (Th/U = 3-8) ratios are indicative of an acidic-intermediate igneous source that had undergone weak chemical weathering. All of the samples are moderately enriched in LREE (light REE) and show relatively flat Chondrite-normalized HREE (heavy REE) patterns (La N/Yb N = 3.2-12.6) with various negative Eu anomalies (Eu/Eu* = 0.4-0.9). Meta-arenaceous samples have moderate SiO 2 (average 72.9 wt.%), Al 2O 3 (average 11.5 wt.%), Fe 2O 3 T + MgO (average 7.16 wt.%) contents and moderate Al 2O 3/SiO 2 (average 0.16), K 2O/Na 2O (average 0.93) ratios, similar to those of graywackes from continental island arcs or active continental margins. However, meta-argillaceous samples have high SiO 2 (average 60.8 wt.%), Al 2O 3 (average 17.2 wt.%), Fe 2O 3 T + MgO (average 12.2 wt.%) contents and high K 2O/Na 2O (average 3.45), Al 2O 3/SiO 2 (average 0.28) ratios similar to mudstones from continental arc basins. This kind of tectonic environment is also manifested in tectonic discrimination diagrams including Th-Sc-Zr/10 and La-Th-Sc. These geochemical characteristics suggest that the metasedimentary rocks were deposited in an active continental margin or continental arc setting. This does not favor the previously proposed passive continental margin model. Therefore, this study supports an arc accretion model for the Chinese Altai. © 2008 Elsevier B.V. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/sedgeoen_HK
dc.relation.ispartofSedimentary Geologyen_HK
dc.subjectAltaien_HK
dc.subjectGeochemistryen_HK
dc.subjectMetasedimentary rocksen_HK
dc.subjectSedimentary provenanceen_HK
dc.subjectTectonic evolutionen_HK
dc.titleEarly Paleozoic sedimentary record of the Chinese Altai: Implications for its tectonic evolutionen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0037-0738&volume=208&spage=88&epage=100&date=2008&atitle=Geochemical+study+of+sedimentary+rocks+from+the+Habahe+Group,+Chinese+Altai:+Implications+for+Paleozoic+tectonic+evolutionen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.sedgeo.2008.05.002en_HK
dc.identifier.scopuseid_2-s2.0-48349112272en_HK
dc.identifier.hkuros161219en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-48349112272&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume208en_HK
dc.identifier.issue3-4en_HK
dc.identifier.spage88en_HK
dc.identifier.epage100en_HK
dc.identifier.isiWOS:000259078800003-
dc.publisher.placeNetherlandsen_HK
dc.identifier.scopusauthoridLong, X=14012199100en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridYuan, C=35241599200en_HK
dc.identifier.scopusauthoridXiao, W=7202456615en_HK
dc.identifier.scopusauthoridCai, K=14011943800en_HK

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