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Geochemistry and Os-Nd-Sr isotopes of the Gaositai Alaskantype ultramafic complex from the northern North China craton: implications for mantle-crust interaction

Chen, Bin; Suzuki, K; Tian, Wei; Jahn, B.M.; Ireland, Trevor

Description

We report petrological, chemical and Os-Nd-Sr isotopic data for the Gaositai ultramafic complex from northern North China craton (NCC) to reveal its petrogenesis. The complex shows features of Alaskan-type intrusions, including (1) the concentric zoning from dunite core, to clinopyroxenite and hornblendite in the rim, and the common cumulative textures; (2) the abundance of olivine, clinopyroxene and hornblende, and the scarcity of orthopyroxene and plagioclase, and (3) the systematic decrease...[Show more]

dc.contributor.authorChen, Bin
dc.contributor.authorSuzuki, K
dc.contributor.authorTian, Wei
dc.contributor.authorJahn, B.M.
dc.contributor.authorIreland, Trevor
dc.date.accessioned2015-12-10T21:57:41Z
dc.identifier.issn0010-7999
dc.identifier.urihttp://hdl.handle.net/1885/39893
dc.description.abstractWe report petrological, chemical and Os-Nd-Sr isotopic data for the Gaositai ultramafic complex from northern North China craton (NCC) to reveal its petrogenesis. The complex shows features of Alaskan-type intrusions, including (1) the concentric zoning from dunite core, to clinopyroxenite and hornblendite in the rim, and the common cumulative textures; (2) the abundance of olivine, clinopyroxene and hornblende, and the scarcity of orthopyroxene and plagioclase, and (3) the systematic decrease in Mg# of ferromagnesian phases from core to rim, accompanied by the Fe-enrichment trend of accessory spinel. The different rock types show highly varied, radiogenic Os isotopic ratios (0.129-5.2), and unradiogenic Nd isotopic composition (ε Nd(t) = -8 to -15), but are homogeneous in I Sr ratios (0.7054-0.7066). The ( 187Os/ 188Os) i ratios are found to be anti-correlated with ε Nd(t) values and whole-rock Mg# as well. These data suggest significant crustal contamination during magma evolution. The crustal contaminants are dominantly Archean mafic rocks in the lower crust, and subordinate TTG gneisses at shallower crustal levels. The parental magma was hydrous picritic in composition, derived from an enriched lithospheric mantle source above a subduction zone. The zoned pattern of the complex formed probably through "flow differentiation" of a rapidly rising crystal mush along a fracture zone that was developed as a result of lithospheric extension in a back-arc setting in the northern margin of the NCC at ca. 280 Ma.
dc.publisherSpringer
dc.sourceContributions to Mineralogy and Petrology
dc.subjectKeywords: clinopyroxene; crust-mantle boundary; crustal contamination; enrichment; hornblende; igneous geochemistry; isotopic composition; isotopic ratio; magmatism; mantle source; neodymium isotope; osmium isotope; strontium isotope; subduction zone; ultramafic ro Alaskan-type; North China craton; Os-Nd-Srisotopes; Ultramafic rocks
dc.titleGeochemistry and Os-Nd-Sr isotopes of the Gaositai Alaskantype ultramafic complex from the northern North China craton: implications for mantle-crust interaction
dc.typeJournal article
local.description.notesImported from ARIES
local.identifier.citationvolume158
dc.date.issued2009
local.identifier.absfor040203 - Isotope Geochemistry
local.identifier.ariespublicationu4047674xPUB185
local.type.statusPublished Version
local.contributor.affiliationChen, Bin, Peking University
local.contributor.affiliationSuzuki, K, Japan Agency for Marine Earth Science and Technology
local.contributor.affiliationTian, Wei, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationJahn, B.M., Institute of Earth Sciences, Academia Sinica
local.contributor.affiliationIreland, Trevor, College of Physical and Mathematical Sciences, ANU
local.description.embargo2037-12-31
local.bibliographicCitation.issue5
local.bibliographicCitation.startpage683
local.bibliographicCitation.lastpage702
local.identifier.doi10.1007/s00410-009-0404-7
dc.date.updated2016-02-24T10:31:42Z
local.identifier.scopusID2-s2.0-70349224334
local.identifier.thomsonID000269846800008
CollectionsANU Research Publications

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