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Article: Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau
Title | Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau | ||||||||||||||
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Authors | |||||||||||||||
Keywords | Arc-like volcanic rocks Heterogeneous mantle source Magma chamber processes SE margin of the Tibetan Plateau Sr-Nd-Pb-Hf isotopes Tengchong | ||||||||||||||
Issue Date | 2012 | ||||||||||||||
Publisher | Springer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm | ||||||||||||||
Citation | Contributions To Mineralogy And Petrology, 2012, v. 163 n. 5, p. 841-860 How to Cite? | ||||||||||||||
Abstract | The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1-4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive mantle-normalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87Sr/ 86Sr ratios (0.706-0.709), εNd values (-3.2 to -8.7), and εHf values (+4.8 to -6.4) indicate a highly heterogeneous mantle source. The Pb isotopic ratios of the lavas ( 206Pb/ 204Pb = 18.02-18.30) clearly show an EMI-type mantle source. The underlying mantle source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous mantle source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting. © 2011 The Author(s). | ||||||||||||||
Persistent Identifier | http://hdl.handle.net/10722/147121 | ||||||||||||||
ISSN | 2023 Impact Factor: 3.5 2023 SCImago Journal Rankings: 1.865 | ||||||||||||||
ISI Accession Number ID |
Funding Information: Support from research grants from the State Key Laboratory of Ore Deposit Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences (200802) to MFZ, National Natural Science Foundation of China (41172191) to DPY, CAS Hundred Talents projects to CYW, and a CAS/SAFEA International Partnership Program for Creative Research Teams (KZCX2-YW-t004), are gratefully acknowledged. Field assistance was provided by Xu Zhangbao from the Yunnan Geological Survey. We thank two anonymous referees for helpful reviews. | ||||||||||||||
References |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Zhou, MF | en_HK |
dc.contributor.author | Robinson, PT | en_HK |
dc.contributor.author | Wang, CY | en_HK |
dc.contributor.author | Zhao, JH | en_HK |
dc.contributor.author | Yan, DP | en_HK |
dc.contributor.author | Gao, JF | en_HK |
dc.contributor.author | Malpas, J | en_HK |
dc.date.accessioned | 2012-05-28T08:18:54Z | - |
dc.date.available | 2012-05-28T08:18:54Z | - |
dc.date.issued | 2012 | en_HK |
dc.identifier.citation | Contributions To Mineralogy And Petrology, 2012, v. 163 n. 5, p. 841-860 | en_HK |
dc.identifier.issn | 0010-7999 | en_HK |
dc.identifier.uri | http://hdl.handle.net/10722/147121 | - |
dc.description.abstract | The Tengchong volcanic field north of the Burma arc comprises numerous Quaternary volcanoes in the southeastern margin of the Tibetan Plateau. The volcanic rocks are grouped into four units (1-4) from the oldest to youngest. Units 1, 3 and 4 are composed of olivine trachybasalt, basaltic trachyandesite and trachyandesite, and Unit 2 consists of hornblende dacite. The rocks of Units 1, 3, and 4 form a generally alkaline suite in which the rocks plot along generally linear trends on Harker diagrams with only slight offset from unit to unit. They contain olivine phenocrysts with Fo values ranging from 65 to 85 mol% and have Cr-spinel with Cr# ranging from 23 to 35. All the rocks have chondrite-normalized REE patterns enriched in LREE and primitive mantle-normalized trace element patterns depleted in Ti, Nb and Ta, but they are rich in Th, Ti and P relative to typical arc volcanics. Despite minor crustal contamination, 87Sr/ 86Sr ratios (0.706-0.709), εNd values (-3.2 to -8.7), and εHf values (+4.8 to -6.4) indicate a highly heterogeneous mantle source. The Pb isotopic ratios of the lavas ( 206Pb/ 204Pb = 18.02-18.30) clearly show an EMI-type mantle source. The underlying mantle source was previously modified by subduction of the Neo-Tethyan oceanic and Indian continental lithosphere. The present heterogeneous mantle source is interpreted to have formed by variable additions of fluids and sediments derived from the subducted Indian Oceanic lithosphere, probably the Ninety East Ridge. Magma generation and emplacement was facilitated by transtensional NS-trending strike-slip faulting. © 2011 The Author(s). | en_HK |
dc.language | eng | en_US |
dc.publisher | Springer Verlag. The Journal's web site is located at http://link.springer.de/link/service/journals/00410/index.htm | en_HK |
dc.relation.ispartof | Contributions to Mineralogy and Petrology | en_HK |
dc.rights | The Author(s) | en_US |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | en_US |
dc.subject | Arc-like volcanic rocks | en_HK |
dc.subject | Heterogeneous mantle source | en_HK |
dc.subject | Magma chamber processes | en_HK |
dc.subject | SE margin of the Tibetan Plateau | en_HK |
dc.subject | Sr-Nd-Pb-Hf isotopes | en_HK |
dc.subject | Tengchong | en_HK |
dc.title | Heterogeneous mantle source and magma differentiation of quaternary arc-like volcanic rocks from Tengchong, SE margin of the Tibetan Plateau | en_HK |
dc.type | Article | en_HK |
dc.identifier.openurl | http://www.springerlink.com/link-out/?id=2104&code=J175154718L28GV1&MUD=MP | en_US |
dc.identifier.email | Zhou, MF: mfzhou@hkucc.hku.hk | en_HK |
dc.identifier.email | Malpas, J: jgmalpas@hku.hk | en_HK |
dc.identifier.authority | Zhou, MF=rp00844 | en_HK |
dc.identifier.authority | Malpas, J=rp00059 | en_HK |
dc.description.nature | published_or_final_version | en_US |
dc.identifier.doi | 10.1007/s00410-011-0702-8 | en_HK |
dc.identifier.scopus | eid_2-s2.0-84859726759 | en_HK |
dc.relation.references | http://www.scopus.com/mlt/select.url?eid=2-s2.0-84859726759&selection=ref&src=s&origin=recordpage | en_HK |
dc.identifier.volume | 163 | en_HK |
dc.identifier.issue | 5 | en_HK |
dc.identifier.spage | 841 | en_HK |
dc.identifier.epage | 860 | en_HK |
dc.identifier.eissn | 1432-0967 | en_US |
dc.identifier.isi | WOS:000302816200006 | - |
dc.publisher.place | Germany | en_HK |
dc.description.other | Springer Open Choice, 28 May 2012 | en_US |
dc.identifier.scopusauthorid | Zhou, MF=7403506005 | en_HK |
dc.identifier.scopusauthorid | Robinson, PT=7403720506 | en_HK |
dc.identifier.scopusauthorid | Wang, CY=34976092700 | en_HK |
dc.identifier.scopusauthorid | Zhao, JH=49061691300 | en_HK |
dc.identifier.scopusauthorid | Yan, DP=36683417500 | en_HK |
dc.identifier.scopusauthorid | Gao, JF=25638167000 | en_HK |
dc.identifier.scopusauthorid | Malpas, J=7006136845 | en_HK |
dc.identifier.citeulike | 10003963 | - |
dc.identifier.issnl | 0010-7999 | - |