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Article: Nb-depleted, continental rift-related Akaz metavolcanic rocks (West Kunlun): Implication for the rifting of the Tarim Craton from Gondwana

TitleNb-depleted, continental rift-related Akaz metavolcanic rocks (West Kunlun): Implication for the rifting of the Tarim Craton from Gondwana
Authors
Issue Date2004
PublisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/sp
Citation
Geological Society Special Publication, 2004, v. 226, p. 131-143 How to Cite?
AbstractThe Akaz metavolcanic rocks of the West Kunlun Mountains possess low to intermediate SiO2 (42.3-64.7 wt%) and MgO (2.69-7.54 wt%) and high TiO2 (0.94-3.05 wt%) and Fe2O3 T (7.64-18.47 wt%), indicating a basaltic to andesitic protolith. These rocks have high contents of Zr (89.6-470 ppm), Nb (10.0-40.3 ppm), Y (19.7-52.7 ppm), Th (0.86-15.96 ppm) and total REE (67.7-407 ppm), and are characterized by relatively high Ti/Y (183-649), Th/Yb (0.5-3.9), and low Hf/Ta (3.0-8.6) ratios. They are LREE-enriched (La/Yb = 5.4-20) and most have small negative Nb anomalies (Nb/Nb* = 0.20-1.16). These characteristics are transitional between within-plate and subduction-related basalts. The relatively higg Gd/Yb ratios (1.4-2.9) distinguish these rocks from island-arc tholeiites and the high Zr/Y (3-12), Ta/Yb (0.3-0.7) and low Zr/Nb (< 12) ratios strongly support a continental affinity. The protoliths for the Akaz metavolcanic rocks are interpreted to be continental rift basalts formed during rifting of the Tarim Craton from Gondwana. Stratigraphic and palaeontological data indicate that the rifting occurred in Sinian to Cambrian times, roughly contemporaneously with rifting in the East Kunlun and North Qilian orogenic belts farther to the east. © The Geological Society of London 2004.
Persistent Identifierhttp://hdl.handle.net/10722/151266
ISSN
2015 SCImago Journal Rankings: 0.747
References

 

DC FieldValueLanguage
dc.contributor.authorYuan, Cen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorYang, Jen_US
dc.contributor.authorZhou, Hen_US
dc.contributor.authorZhou, MFen_US
dc.date.accessioned2012-06-26T06:19:40Z-
dc.date.available2012-06-26T06:19:40Z-
dc.date.issued2004en_US
dc.identifier.citationGeological Society Special Publication, 2004, v. 226, p. 131-143en_US
dc.identifier.issn0305-8719en_US
dc.identifier.urihttp://hdl.handle.net/10722/151266-
dc.description.abstractThe Akaz metavolcanic rocks of the West Kunlun Mountains possess low to intermediate SiO2 (42.3-64.7 wt%) and MgO (2.69-7.54 wt%) and high TiO2 (0.94-3.05 wt%) and Fe2O3 T (7.64-18.47 wt%), indicating a basaltic to andesitic protolith. These rocks have high contents of Zr (89.6-470 ppm), Nb (10.0-40.3 ppm), Y (19.7-52.7 ppm), Th (0.86-15.96 ppm) and total REE (67.7-407 ppm), and are characterized by relatively high Ti/Y (183-649), Th/Yb (0.5-3.9), and low Hf/Ta (3.0-8.6) ratios. They are LREE-enriched (La/Yb = 5.4-20) and most have small negative Nb anomalies (Nb/Nb* = 0.20-1.16). These characteristics are transitional between within-plate and subduction-related basalts. The relatively higg Gd/Yb ratios (1.4-2.9) distinguish these rocks from island-arc tholeiites and the high Zr/Y (3-12), Ta/Yb (0.3-0.7) and low Zr/Nb (< 12) ratios strongly support a continental affinity. The protoliths for the Akaz metavolcanic rocks are interpreted to be continental rift basalts formed during rifting of the Tarim Craton from Gondwana. Stratigraphic and palaeontological data indicate that the rifting occurred in Sinian to Cambrian times, roughly contemporaneously with rifting in the East Kunlun and North Qilian orogenic belts farther to the east. © The Geological Society of London 2004.en_US
dc.languageengen_US
dc.publisherGeological Society Publishing House. The Journal's web site is located at http://www.geolsoc.org.uk/spen_US
dc.relation.ispartofGeological Society Special Publicationen_US
dc.titleNb-depleted, continental rift-related Akaz metavolcanic rocks (West Kunlun): Implication for the rifting of the Tarim Craton from Gondwanaen_US
dc.typeArticleen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.emailZhou, MF: mfzhou@hkucc.hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.identifier.authorityZhou, MF=rp00844en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1144/GSL.SP.2004.226.01.07en_US
dc.identifier.scopuseid_2-s2.0-5544226517en_US
dc.identifier.hkuros108619-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-5544226517&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume226en_US
dc.identifier.spage131en_US
dc.identifier.epage143en_US
dc.publisher.placeUnited Kingdomen_US
dc.identifier.scopusauthoridYuan, C=35241599200en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridYang, J=35335519900en_US
dc.identifier.scopusauthoridZhou, H=7404741996en_US
dc.identifier.scopusauthoridZhou, MF=7403506005en_US
dc.customcontrol.immutablesml 130308-

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