Contrasting 18O enrichment and origins of High Himalayan and Transhimalayan intrusives

Details Contrasting 18O enrichment and origins of High Himalayan and Transhimalayan intrusives Contrasting 18O enrichment and origins of High Himalayan and Transhimalayan intrusives

Nov 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983e%26psl..65..276b&link_type=abstract

Earth and Planetary Science Letters, Volume 65, Issue 2, p. 276-286.

Computer Science

13

Scientific paper

Twelve analysed leucogranites of the High Himalaya in Bhutan (Chung La, Mönlakarchung) and Garhwal (Badrinath) are among the most 18O-enriched granites known (11.5-12.4‰ δ18OSMOW with two exceptions) and separate minerals show good isotopic concordance. The data strongly support an origin of the granites by anatexis of continental basement such as the Indian crystalline basement sheet or slab, undercut by the Main Central Thrust, of which five samples were analysed. In contrast, the pre-collision Transhimalayan (Gangdese) batholiths to the north of the Indus-Tsangpo suture, as exemplified by the Ladakh intrusives, show an initially oceanic trend of δ18O vs. SiO2 that becomes gradually somewhat enriched with respect to Hachijo-Jima. While not completely outside the range of enrichment that seems possible by fractional crystallisation, this could tie in with the 87Sr inhomogeneities reported by Honegger et al. [9], which may be due to assimilation of variably radiogenic Eurasian continental basement. For both the leucogranites and Ladakh intrusives the 18O levels and the concordance between minerals rule out significant cumulative water/rock ratios in syn- or post-magmatic interaction with subsurface waters.

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