Origin of a Mesozoic granite with A-type characteristics from the North China craton: highly fractionated from I-type magmas?

Origin of a Mesozoic granite with A-type characteristics from the North China craton: highly fractionated from I-type magmas?

We report geochronological, geochemical and isotopic data for the Mesozoic Shangshuiquan granite from the northern margin of the North China craton. The granite is highly fractionated, with SiO 2  > 74%. Occurrence of annitic biotite, high contents of alkalis (K 2 O + Na 2 O), Rb, Y, Nb and heavy...

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Veröffentlicht in:Contributions to mineralogy and petrology 2009-07, Vol.158 (1), p.113-130
Hauptverfasser: Jiang, Neng, Zhang, Shuangquan, Zhou, Wenge, Liu, Yongsheng
Format: Artikel
Sprache:eng
Schlagworte:
Alkalinity
Earth and Environmental Science
Earth Sciences
Fractionation
Geochemistry
Geology
Granite
Isotopes
Mesozoic
Mineral Resources
Mineralogy
Original Paper
Petrology
Rare earth elements
Rocks
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Zusammenfassung:We report geochronological, geochemical and isotopic data for the Mesozoic Shangshuiquan granite from the northern margin of the North China craton. The granite is highly fractionated, with SiO 2  > 74%. Occurrence of annitic biotite, high contents of alkalis (K 2 O + Na 2 O), Rb, Y, Nb and heavy rare earth elements, high FeO t /MgO, low contents of CaO, Al 2 O 3 , Ba, and Sr, and large negative Eu anomalies, makes it indistinguishable from typical A-type granites. A mantle-derived origin for the rocks of the granite is not favored because their high initial 87 Sr/ 86 Sr (≥0.706) and low ε Nd ( t ) (
ISSN:0010-7999
1432-0967
DOI:10.1007/s00410-008-0373-2