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Article: Mesozoic lower crustal xenoliths and their significances in lithospheric evolution beneath the Sino-Korean Craton

TitleMesozoic lower crustal xenoliths and their significances in lithospheric evolution beneath the Sino-Korean Craton
Authors
KeywordsCrust/Mantle Interaction
Geochemistry
Lower Crustal Composition
Mesozoic Xenolith
Petrology
Sino-Korean Craton
Issue Date2003
PublisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tecto
Citation
Tectonophysics, 2003, v. 361 n. 1-2, p. 37-60 How to Cite?
AbstractMafic high-pressure granulite, eclogite and pyroxenite xenoliths have been collected from a Mesozoic volcaniclastic diatreme in Xinyang, near south margin of the Sino-Korean Craton (SKC). The high-pressure granulite xenoliths are mainly composed of fine-grained granoblasts of Grt+Cpx+Pl+ Hbl±Kfs±Q±Ilm with relict porphyritic mineral assemblage of Grt+Cpx ±Pl±Rt. P-T estimation indicates that the granoblastic assemblage crystallized at 765-890 °C and 1.25-1.59 GPa, corresponding to crustal depths of ca. 41-52 km with a geotherm of 75-80 mW/m2. Calculated seismic velocities (Vp) of high-pressure granulites range from 7.04 to 7.56 km/s and densities (D) from 3.05 to 3.30 g/cm3. These high-pressure granulite xenoliths have different petrographic and geochemical features from the Archean mafic granulites. Elevated geotherm and petrographic evidence imply that the lithosphere of this craton was thermally disturbed in the Mesozoic prior to eruption of the host diatreme. These samples have sub- alkaline basaltic compositions, equivalent to olivine- and quartz- tholeiite. REE patterns are flat to variably LREE-enriched (LaN/YbN= 0.98-9.47) without Eu anomaly (Eu/Eu*=0.95-1.11). They possess 48-127 ppm Ni and 2-20 ppm Nb with Nb/U and La/Nb ratios of 13-54 and 0.93-4.75, respectively, suggesting that these high-pressure granulites may be products of mantle-derived magma underplated and contaminated at the base of the lower crust. This study also implies that up to 10 km Mesozoic lowermost crust was delaminated prior to eruption of the Cenozoic basalts on the craton. © 2002 Elsevier Science B.V. All rights reserved.
Persistent Identifierhttp://hdl.handle.net/10722/151094
ISSN
2015 Impact Factor: 2.65
2015 SCImago Journal Rankings: 1.971
ISI Accession Number ID
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, Jen_US
dc.contributor.authorSun, Men_US
dc.contributor.authorLu, Fen_US
dc.contributor.authorPearson, Nen_US
dc.date.accessioned2012-06-26T06:17:01Z-
dc.date.available2012-06-26T06:17:01Z-
dc.date.issued2003en_US
dc.identifier.citationTectonophysics, 2003, v. 361 n. 1-2, p. 37-60en_US
dc.identifier.issn0040-1951en_US
dc.identifier.urihttp://hdl.handle.net/10722/151094-
dc.description.abstractMafic high-pressure granulite, eclogite and pyroxenite xenoliths have been collected from a Mesozoic volcaniclastic diatreme in Xinyang, near south margin of the Sino-Korean Craton (SKC). The high-pressure granulite xenoliths are mainly composed of fine-grained granoblasts of Grt+Cpx+Pl+ Hbl±Kfs±Q±Ilm with relict porphyritic mineral assemblage of Grt+Cpx ±Pl±Rt. P-T estimation indicates that the granoblastic assemblage crystallized at 765-890 °C and 1.25-1.59 GPa, corresponding to crustal depths of ca. 41-52 km with a geotherm of 75-80 mW/m2. Calculated seismic velocities (Vp) of high-pressure granulites range from 7.04 to 7.56 km/s and densities (D) from 3.05 to 3.30 g/cm3. These high-pressure granulite xenoliths have different petrographic and geochemical features from the Archean mafic granulites. Elevated geotherm and petrographic evidence imply that the lithosphere of this craton was thermally disturbed in the Mesozoic prior to eruption of the host diatreme. These samples have sub- alkaline basaltic compositions, equivalent to olivine- and quartz- tholeiite. REE patterns are flat to variably LREE-enriched (LaN/YbN= 0.98-9.47) without Eu anomaly (Eu/Eu*=0.95-1.11). They possess 48-127 ppm Ni and 2-20 ppm Nb with Nb/U and La/Nb ratios of 13-54 and 0.93-4.75, respectively, suggesting that these high-pressure granulites may be products of mantle-derived magma underplated and contaminated at the base of the lower crust. This study also implies that up to 10 km Mesozoic lowermost crust was delaminated prior to eruption of the Cenozoic basalts on the craton. © 2002 Elsevier Science B.V. All rights reserved.en_US
dc.languageengen_US
dc.publisherElsevier BV. The Journal's web site is located at http://www.elsevier.com/locate/tectoen_US
dc.relation.ispartofTectonophysicsen_US
dc.rightsTectonophysics. Copyright © Elsevier BV.-
dc.subjectCrust/Mantle Interactionen_US
dc.subjectGeochemistryen_US
dc.subjectLower Crustal Compositionen_US
dc.subjectMesozoic Xenolithen_US
dc.subjectPetrologyen_US
dc.subjectSino-Korean Cratonen_US
dc.titleMesozoic lower crustal xenoliths and their significances in lithospheric evolution beneath the Sino-Korean Cratonen_US
dc.typeArticleen_US
dc.identifier.emailSun, M: minsun@hku.hken_US
dc.identifier.authoritySun, M=rp00780en_US
dc.description.naturelink_to_subscribed_fulltexten_US
dc.identifier.doi10.1016/S0040-1951(02)00537-1en_US
dc.identifier.scopuseid_2-s2.0-0037426688en_US
dc.identifier.hkuros81710-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-0037426688&selection=ref&src=s&origin=recordpageen_US
dc.identifier.volume361en_US
dc.identifier.issue1-2en_US
dc.identifier.spage37en_US
dc.identifier.epage60en_US
dc.identifier.isiWOS:000180362700003-
dc.publisher.placeNetherlandsen_US
dc.identifier.scopusauthoridZheng, J=48961536100en_US
dc.identifier.scopusauthoridSun, M=25932315800en_US
dc.identifier.scopusauthoridLu, F=22958588500en_US
dc.identifier.scopusauthoridPearson, N=7004954526en_US
dc.customcontrol.immutablesml 130311-

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