Geochronologic-petrochemical studies of the Hongshishan mafic-ultramafic intrusion, Beishan area, Xinjiang (NW China): Petrogenesis and tectonic implications

Simple item page
dc.contributor.authorSu, B.
dc.contributor.authorQin, K.
dc.contributor.authorSakyi, P.A.
dc.contributor.authorTang, D.
dc.contributor.authorLiu, P.
dc.contributor.authorMalaviarachchi, S.P.K.
dc.contributor.authorXiao, Q.
dc.contributor.authorSun, H.
dc.date.accessioned2019-01-21T10:48:02Z
dc.date.available2019-01-21T10:48:02Z
dc.date.issued2012-02
dc.description.abstractThe Hongshishan mafic-ultramafic intrusion (SIMS zircon U-Pb age 286.4 ± 2.8Ma) consists of dunite, clinopyroxene peridotite, troctolite, and gabbro. Major elements display systematic correlations. Trace elements have identical distribution patterns, including flat rare-earth element (REE) patterns with positive Eu anomalies and enrichments in large ion lithophile elements (LILE) but depletions in Nb and Ta, indicating fractional crystallization as a key factor in magmatic evolution. Petrologic and geochemical variations in drill core samples demonstrate that minor assimilation and progressive magma injections were closely associated with Ni-Cu mineralization. Mass balance estimates and Sr-Nd isotopes reveal that the Hongshishan parental magmas were high-Mg and low-Ti tholeiitic basalts and were derived from a lithospheric mantle source that had been modified by subducted slab metasomatism before partial melting. Southward subduction of the Palaeo-Tianshan-Junggar Ocean is further constrained by a compilation of inferred, subduction-induced modifications of mantle sources in mafic-ultramafic intrusions distributed in the eastern Tianshan-Beishan area. Integrating the regional positive εNd(t) granites, high-Mg and low-Ti basaltic magmas (mafic-ultramafic intrusions), and slightly later high-Ti basalts in NW China suggests that their petrogenesis could be attributed to Permian mantle plume activities. © 2012 Copyright Taylor and Francis Group, LLC.en_US
dc.identifier.otherVolume 54, Issue 3, Pages 270-289
dc.identifier.otherhttps://doi.org/10.1080/00206814.2010.543011
dc.identifier.urihttp://ugspace.ug.edu.gh/handle/123456789/26937
dc.language.isoenen_US
dc.publisherInternational Geology Reviewen_US
dc.subjectBeishanen_US
dc.subjecteastern Tianshanen_US
dc.subjectfractional crystallizationen_US
dc.subjectmafic-ultramafic intrusionsen_US
dc.subjectmantle plumeen_US
dc.titleGeochronologic-petrochemical studies of the Hongshishan mafic-ultramafic intrusion, Beishan area, Xinjiang (NW China): Petrogenesis and tectonic implicationsen_US
dc.typeArticleen_US

Files

License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.6 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Department of Earth Science