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Oxygen isotopes in mantle related and geothermally altered magmatites of the Transhimalayan (Gangdese) ranges

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Abstract

In closed magma systems SiO2 approximately measures differentiation progress and oxygen isotopes can seem to obey Rayleigh fractionation only as a consequence of the behaviour of SiO2. The main role of δ 18O is as a sensitive indicator of contamination, either at the start of differentiation (δ 18Oinit) or as a proportion of fractionation in AFC. Plots of δ 18O vs SiO2-allow to determine initial δ 18O values for different sequences for source comparison. For NBS-28=9.60, the δ 18O at 48% SiO2-varies between a high 6.4‰ for Kiglapait (Kalamarides 1984), 5.9‰ for Transhimalaya, 5.8‰ for Hachijo-Jima (Matsuhisa 1979), 5.6‰ for Koloula (Chivas et al. 1982) and a low 5.3‰ for the Darran Complex, New Zealand. The Transhimalayan batholiths (Gangdese belt) were emplaced in the ‘Ladakh-Lhasa terrane’, between the present-day Banggong-Nujiang, and Indus-Yarlung Tsangbo suture zones, after its accretion to Eurasia. The gradient of the least contaminated continuous (δ 18O vs SiO2-igneous trend line is similar to that of Koloula, and AFC calculations suggest a low secondary assimilation rate of less than 0.05 times the rate of crystallisation. Outliers enriched in 18O are frequent in the Lhasa, and apparently rare in the Ladakh transsect. Low-δ 18O (5.0‰−0‰) granitoids and andesites on the Lhasa-Yangbajain axis are the result of present day or recent near-surface geothermal activity; their quartzes still trace the granitoids to the Transhimalaya δ 18O trend line, but the distribution of low total rock or feldspar δ 18O values could be a guide to more recent heat flow and thermally marked tectonic lineaments. Two ignimbrites from Maqiang show hardly any 18O-contamination by crustal material.

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  1. Xu Yong

    Present address: Department of Geology, University of Bei**g, Bei**g, China

Authors and Affiliations

  1. DSIR Geological Survey, PO Box 30 368, Lower Hutt, New Zealand

    P. Blattner

  2. Institute of Geology, Academia Sinica, PO Box 634, Bei**g, China

    ** Cheng-wei

  3. Geothermal Institute, University of Auckland, Private Bag, Auckland, New Zealand

    Xu Yong

  4. Institute of Nuclear Sciences, PO Box 31 312, Lower Hutt, New Zealand

    P. Blattner

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Blattner, P., Cheng-wei, J. & Yong, X. Oxygen isotopes in mantle related and geothermally altered magmatites of the Transhimalayan (Gangdese) ranges. Contr. Mineral. and Petrol. 101, 438–446 (1989). https://doi.org/10.1007/BF00372217

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