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Article: Geochemistry of basaltic lavas from the Mariana Trough: Evidence for influence of subduction component on the generation of backarc basin magmas

TitleGeochemistry of basaltic lavas from the Mariana Trough: Evidence for influence of subduction component on the generation of backarc basin magmas
Authors
KeywordsIgneous geochemistry
Mariana trough
Oceanic regions
Pacific Ocean
World
Issue Date2005
PublisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGR
Citation
International Geology Review, 2005, v. 47 n. 4, p. 387-397 How to Cite?
AbstractThis paper reports the results of a petrological and geochemical study of eight volcanic rock samples collected from the Mariana Trough (18°00′-18°15′ N, 144°35′-144°55′ E). The samples are basalts or basaltic andesites with geochemical features of the calc-alkaline series. They are enriched in LILE and LREE, with a LaN = 10.68-22.64 and (La/Yb)N = 1.61-2.47, and have positive Eu anomalies. In trace element-normalized plots, seven of the eight samples are obviously depleted in Nb and enriched in Zr and Hf, but one sample does not show pronounced depletion in Nb. The ratios of HFSE/HFSE, LILE /HFSE, and LILE/LILE for these basaltic samples vary between N-MORB and EMI, suggesting that the magma may have been derived from an upper mantle source that was altered or affected by a subduction component. Compared with those from the Okinawa Trough, basaltic rocks from the Mariana Trough show a weaker Nb depletion, implying that the influence of a subduction component is relatively weaker than from the Okinawa Trough. This suggests that magma sources and dynamic processes of the Mariana Trough, in the transition from rift to seafloor spreading, are different from those of the Okinawa Trough, in the stage of a backarc rift. Copyright © 2005 by V. H. Winston & Son, Inc. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/72645
ISSN
2015 Impact Factor: 2.365
2015 SCImago Journal Rankings: 1.248
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorTian, Len_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorZhao, Gen_HK
dc.contributor.authorShi, Xen_HK
dc.contributor.authorLv, Hen_HK
dc.date.accessioned2010-09-06T06:43:46Z-
dc.date.available2010-09-06T06:43:46Z-
dc.date.issued2005en_HK
dc.identifier.citationInternational Geology Review, 2005, v. 47 n. 4, p. 387-397en_HK
dc.identifier.issn0020-6814en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72645-
dc.description.abstractThis paper reports the results of a petrological and geochemical study of eight volcanic rock samples collected from the Mariana Trough (18°00′-18°15′ N, 144°35′-144°55′ E). The samples are basalts or basaltic andesites with geochemical features of the calc-alkaline series. They are enriched in LILE and LREE, with a LaN = 10.68-22.64 and (La/Yb)N = 1.61-2.47, and have positive Eu anomalies. In trace element-normalized plots, seven of the eight samples are obviously depleted in Nb and enriched in Zr and Hf, but one sample does not show pronounced depletion in Nb. The ratios of HFSE/HFSE, LILE /HFSE, and LILE/LILE for these basaltic samples vary between N-MORB and EMI, suggesting that the magma may have been derived from an upper mantle source that was altered or affected by a subduction component. Compared with those from the Okinawa Trough, basaltic rocks from the Mariana Trough show a weaker Nb depletion, implying that the influence of a subduction component is relatively weaker than from the Okinawa Trough. This suggests that magma sources and dynamic processes of the Mariana Trough, in the transition from rift to seafloor spreading, are different from those of the Okinawa Trough, in the stage of a backarc rift. Copyright © 2005 by V. H. Winston & Son, Inc. All rights reserved.en_HK
dc.languageengen_HK
dc.publisherTaylor & Francis Inc. The Journal's web site is located at http://www.tandf.co.uk/journals/TIGRen_HK
dc.relation.ispartofInternational Geology Reviewen_HK
dc.subjectIgneous geochemistry-
dc.subjectMariana trough-
dc.subjectOceanic regions-
dc.subjectPacific Ocean-
dc.subjectWorld-
dc.titleGeochemistry of basaltic lavas from the Mariana Trough: Evidence for influence of subduction component on the generation of backarc basin magmasen_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0020-6814&volume=47&issue=4&spage=387&epage=397&date=APR&atitle=Geochemistry+of+basaltic+lavas+from+the+Mariana+Trough:+Evidence+for+influence+of+subduction+component+on+the+generation+of+backarc+basin+magmasen_HK
dc.identifier.emailZhao, G:gzhao@hkucc.hku.hken_HK
dc.identifier.authorityZhao, G=rp00842en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.2747/0020-6814.47.4.387-
dc.identifier.scopuseid_2-s2.0-17144372242en_HK
dc.identifier.hkuros108536en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-17144372242&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume47en_HK
dc.identifier.issue4en_HK
dc.identifier.spage387en_HK
dc.identifier.epage397en_HK
dc.identifier.isiWOS:000227996500004-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridTian, L=8349754700en_HK
dc.identifier.scopusauthoridZhao, G=8620950100en_HK
dc.identifier.scopusauthoridZhao, G=7403296321en_HK
dc.identifier.scopusauthoridShi, X=15728663000en_HK
dc.identifier.scopusauthoridLv, H=8349754600en_HK

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