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Article: Xinyang mafic granulitic xenoliths and its significance for the early Mesozoic lower crustal nature on the south margin of the North China Craton

TitleXinyang mafic granulitic xenoliths and its significance for the early Mesozoic lower crustal nature on the south margin of the North China Craton
Authors
KeywordsEarly Mesozoic lower crust
Mafic granulite xenolith
Magmas underplating in Early Proterozoic
South margin of the North China Craton
Issue Date2005
PublisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspx
Citation
Acta Petrologica Sinica, 2005, v. 21 n. 1, p. 91-98 How to Cite?
AbstractPetrography, mineral chemistry, petrochemistry, trace elements, Nd isotope and calculated P-T conditions and petrophyscial nature about the mafic garnet granulite xenoliths collected from a Mesozoic volcaniclastic diatreme in Xinyang, south margin of the North China Craton, have been reported in this paper. The 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. Calculated seismic velocities (Vp) of granulites range from 7.04 to 7.56 km/s and densities (D) from 3.05 to 3.30 g/cm3. These samples have sub-alkaline basaltic compositions, equivalent to olivine- and quartz-tholeiitic basalts. 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. Present-day 143Nd/144Nd isotope ratios of the granulites are 0.512267 to 0.512700 with ε Nd(T) = -5.72 to + 1.01. Nd depleted mantle model ages (TDM) are 1.8 - 1.9 Ga. The primary materials of these mafic granulites possibly resulted in the magmas underplating in early Proterozoic, and may triggered by the subduction and collision of the Yangtze with the North China Cratons. The newly formed dense lower crust must have been significantly delaminated and modified, as evidenced by the mafic granulites carried up by the Cenozoic basalts on the North China Craton.
Persistent Identifierhttp://hdl.handle.net/10722/72491
ISSN
2015 Impact Factor: 1.234
2015 SCImago Journal Rankings: 0.892
References

 

DC FieldValueLanguage
dc.contributor.authorZheng, JPen_HK
dc.contributor.authorSun, Men_HK
dc.contributor.authorLu, FXen_HK
dc.contributor.authorYu, CMen_HK
dc.contributor.authorWang, FZen_HK
dc.date.accessioned2010-09-06T06:42:20Z-
dc.date.available2010-09-06T06:42:20Z-
dc.date.issued2005en_HK
dc.identifier.citationActa Petrologica Sinica, 2005, v. 21 n. 1, p. 91-98en_HK
dc.identifier.issn1000-0569en_HK
dc.identifier.urihttp://hdl.handle.net/10722/72491-
dc.description.abstractPetrography, mineral chemistry, petrochemistry, trace elements, Nd isotope and calculated P-T conditions and petrophyscial nature about the mafic garnet granulite xenoliths collected from a Mesozoic volcaniclastic diatreme in Xinyang, south margin of the North China Craton, have been reported in this paper. The 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. Calculated seismic velocities (Vp) of granulites range from 7.04 to 7.56 km/s and densities (D) from 3.05 to 3.30 g/cm3. These samples have sub-alkaline basaltic compositions, equivalent to olivine- and quartz-tholeiitic basalts. 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. Present-day 143Nd/144Nd isotope ratios of the granulites are 0.512267 to 0.512700 with ε Nd(T) = -5.72 to + 1.01. Nd depleted mantle model ages (TDM) are 1.8 - 1.9 Ga. The primary materials of these mafic granulites possibly resulted in the magmas underplating in early Proterozoic, and may triggered by the subduction and collision of the Yangtze with the North China Cratons. The newly formed dense lower crust must have been significantly delaminated and modified, as evidenced by the mafic granulites carried up by the Cenozoic basalts on the North China Craton.en_HK
dc.languageengen_HK
dc.publisherChinese Academy of Sciences, Institute of Geology and Geophysics. The Journal's web site is located at http://www.ysxb.ac.cn/ysxb/ch/index.aspxen_HK
dc.relation.ispartofActa Petrologica Sinicaen_HK
dc.subjectEarly Mesozoic lower crusten_HK
dc.subjectMafic granulite xenolithen_HK
dc.subjectMagmas underplating in Early Proterozoicen_HK
dc.subjectSouth margin of the North China Cratonen_HK
dc.titleXinyang mafic granulitic xenoliths and its significance for the early Mesozoic lower crustal nature on the south margin of the North China Cratonen_HK
dc.typeArticleen_HK
dc.identifier.emailSun, M:minsun@hku.hken_HK
dc.identifier.authoritySun, M=rp00780en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-22744453202en_HK
dc.identifier.hkuros108602en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-22744453202&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume21en_HK
dc.identifier.issue1en_HK
dc.identifier.spage91en_HK
dc.identifier.epage98en_HK
dc.publisher.placeChinaen_HK
dc.identifier.scopusauthoridZheng, JP=35212471400en_HK
dc.identifier.scopusauthoridSun, M=25932315800en_HK
dc.identifier.scopusauthoridLu, FX=22958588500en_HK
dc.identifier.scopusauthoridYu, CM=7404977798en_HK
dc.identifier.scopusauthoridWang, FZ=7501311273en_HK

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