File Download

There are no files associated with this item.

  Links for fulltext
     (May Require Subscription)
Supplementary

Article: The high-grade Tseel Terrane in SW Mongolia: an early Paleozoic arc system or a Precambrian sliver?

TitleThe high-grade Tseel Terrane in SW Mongolia: an early Paleozoic arc system or a Precambrian sliver?
Authors
KeywordsDevonian
Gneiss
Metamorphism
Paleozoic
Precambrian
Issue Date2012
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithos
Citation
Lithos, 2012, v. 142-143, p. 95-115 How to Cite?
AbstractThe high-grade metamorphic Tseel Terrane in southwestern Mongolia is dominated by a strongly deformed sequence of migmatitic gneisses which has previously been interpreted as an early Precambrian continental sliver. However, the protolith age and timing of high-grade metamorphism remain poorly constrained. To resolve this problem, high-grade gneisses selected from the western Tseel Terrane were dated in the present study. Zircons with oscillatory zoning from three paragneisses predominantly yielded early Paleozoic ages between 450 and 550. Ma, with prominent peaks at 471 and 506. Ma. U-Pb dating of zircons from a granitic gneiss revealed that the protolith was emplaced at 420. Ma. Zircons from a leucocratic granite vein gave a concordant age of 385 ± 3. Ma, close to ages of metamorphic zircons in the gneissic rocks, which is interpreted to record a high-temperature thermal event in the region. These results indicate that the Tseel Terrane principally consists of early Paleozoic rocks which underwent a high-grade metamorphic event in the Middle Devonian. In addition, SHRIMP dating of dominant magmatic zircons from an associated schist yielded a concordant U-Pb age of 495 ± 5. Ma, similar to those of the major zircon group in the high-grade paragneiss. A felsic tuffaceous sample yielded a U-Pb zircon age of 511 ± 4. Ma, documenting early Paleozoic volcanism which probably contributed to the deposition of the sediments in the region. Geochemically, high-grade paragneisses and low-grade schists show close similarities, and their common features suggest that their protoliths may represent significant erosion products of Cambrian arc magmatic rocks with minor old crustal components that were deposited in an active margin setting. The granitic gneiss with subduction-related chemical characteristics further favors an arc setting for the Tseel Terrane. Accordingly, our data combined with previous work suggest that the Tseel Terrane represents the constituent part of an early Paleozoic arc system situated on the southern margin of North Mongolian Domain. This arc system extended from western Mongolia to the Chinese Altai because various geological features of these two regions have close similarities. © 2012 Elsevier B.V.
Persistent Identifierhttp://hdl.handle.net/10722/151374
ISSN
2015 Impact Factor: 3.723
2015 SCImago Journal Rankings: 2.920
ISI Accession Number ID
Funding AgencyGrant Number
Chinese National 973 Program2007CB411308
Hong Kong Research Grants CouncilHKU704307P
HKU705311P
NSFC40725009
Hong Kong University
Hong Kong-Germany Joint Research Scheme
Funding Information:

This study was financially supported by funds from the Chinese National 973 Program (2007CB411308), the Hong Kong Research Grants Council (HKU704307P, HKU705311P), the NSFC (40725009), Hong Kong University research grants and Hong Kong-Germany Joint Research Scheme. Hongyan Geng and Jean Wong at HKU and technicians in the Beijing SHRIMP Centre, CAGS, are acknowledged for laboratory assistance. Profs. Jinyi Li, Tao Wang and Dr. Ying Tong from CAGS are acknowledged for collaboration and discussion. We thank scientists from the Institute of Geology and Mineral Resources, Mongolian Academy of Sciences, for help during our field investigation. We are indebted to two anonymous reviewers, as well as associated editor Dr. Marco Scambelluri for their constructive reviews and valuable comments that improved the manuscript.

 

DC FieldValueLanguage
dc.contributor.authorJiang, Yen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorKroner, Aen_US
dc.contributor.authorTumurkhuu, Den_US
dc.contributor.authorLong, Xen_US
dc.contributor.authorZhao, Gen_US
dc.contributor.authorYuan, Cen_US
dc.contributor.authorXiao, Wen_US
dc.date.accessioned2012-06-26T06:21:20Z-
dc.date.available2012-06-26T06:21:20Z-
dc.date.issued2012en_US
dc.identifier.citationLithos, 2012, v. 142-143, p. 95-115en_US
dc.identifier.issn0024-4937en_US
dc.identifier.urihttp://hdl.handle.net/10722/151374-
dc.description.abstractThe high-grade metamorphic Tseel Terrane in southwestern Mongolia is dominated by a strongly deformed sequence of migmatitic gneisses which has previously been interpreted as an early Precambrian continental sliver. However, the protolith age and timing of high-grade metamorphism remain poorly constrained. To resolve this problem, high-grade gneisses selected from the western Tseel Terrane were dated in the present study. Zircons with oscillatory zoning from three paragneisses predominantly yielded early Paleozoic ages between 450 and 550. Ma, with prominent peaks at 471 and 506. Ma. U-Pb dating of zircons from a granitic gneiss revealed that the protolith was emplaced at 420. Ma. Zircons from a leucocratic granite vein gave a concordant age of 385 ± 3. Ma, close to ages of metamorphic zircons in the gneissic rocks, which is interpreted to record a high-temperature thermal event in the region. These results indicate that the Tseel Terrane principally consists of early Paleozoic rocks which underwent a high-grade metamorphic event in the Middle Devonian. In addition, SHRIMP dating of dominant magmatic zircons from an associated schist yielded a concordant U-Pb age of 495 ± 5. Ma, similar to those of the major zircon group in the high-grade paragneiss. A felsic tuffaceous sample yielded a U-Pb zircon age of 511 ± 4. Ma, documenting early Paleozoic volcanism which probably contributed to the deposition of the sediments in the region. Geochemically, high-grade paragneisses and low-grade schists show close similarities, and their common features suggest that their protoliths may represent significant erosion products of Cambrian arc magmatic rocks with minor old crustal components that were deposited in an active margin setting. The granitic gneiss with subduction-related chemical characteristics further favors an arc setting for the Tseel Terrane. Accordingly, our data combined with previous work suggest that the Tseel Terrane represents the constituent part of an early Paleozoic arc system situated on the southern margin of North Mongolian Domain. This arc system extended from western Mongolia to the Chinese Altai because various geological features of these two regions have close similarities. © 2012 Elsevier B.V.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/lithosen_US
dc.relation.ispartofLithosen_US
dc.subjectDevonianen_US
dc.subjectGneissen_US
dc.subjectMetamorphismen_US
dc.subjectPaleozoicen_US
dc.subjectPrecambrianen_US
dc.titleThe high-grade Tseel Terrane in SW Mongolia: an early Paleozoic arc system or a Precambrian sliver?en_US
dc.typeArticleen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.emailLong, X: longxp@hku.hk-
dc.identifier.emailZhao, G: gzhao@hkucc.hku.hk-
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/j.lithos.2012.02.016en_US
dc.identifier.scopuseid_2-s2.0-84860510103en_US
dc.identifier.hkuros204263-
dc.identifier.volume142-143en_US
dc.identifier.spage95en_US
dc.identifier.epage115en_US
dc.identifier.isiWOS:000304725500007-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridXiao, W=7202456615en_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridZhao, G=55204406000en_US
dc.identifier.scopusauthoridLong, X=55204877700en_US
dc.identifier.scopusauthoridTumurkhuu, D=55204866900en_US
dc.identifier.scopusauthoridKröner, A=7006453132en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridJiang, Y=39861696800en_US
dc.identifier.citeulike10525388-

Export via OAI-PMH Interface in XML Formats


OR


Export to Other Non-XML Formats