Geochemical discrimination and petrogenetic affinities of dykes intruding the Ladakh batholith, NW India

Heri, A. R.; Bahl, J.; Villa, Igor M. (2019). Geochemical discrimination and petrogenetic affinities of dykes intruding the Ladakh batholith, NW India. Geological Society Special Publications, 481(1), pp. 231-250. London: Geological Society, London 10.1144/SP481-2017-150

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Eocene dykes extending over 50 km along the southern margin of the Ladakh batholith (NW India) fall into two main groups showing different orientation as well as isotope and trace element geochemistry. Both dyke families formed in the same tectonic setting over a time span of approximately 4 Ma. However, each family is far from monolithic, and therefore we tested several statistical approaches to identify geochemical subgroups from REE data and relate them to magmatogenetic processes.
Hierarchical Clustering and Multidimensional Scaling calculate similarities/dissimilarities among individuals of a population. Both statistical tools, when applied to the Ladakh dykes, reflect the east-west dichotomy. However, detailed quantification of the resulting grouping varies according to input data. Normalization to chondrites yields slightly different groupings from unnormalized concentration data. Population-internal REE normalization provides the most accurate grouping as revealed by the fact that multiple samples from the same dyke are assigned the closest relatedness. Independently from normalization, east-west dichotomy is mirrored by marked differences in degree of crustal assimilation and magma evolution, pointing to km-scale geological heterogeneity. Finally, dykes intruding the Ladakh batholith 150 km SE of the present samples are geochemically similar, but cluster as distinct group.

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