Tschermaks Clinopyroxene-bearing Calc-silicate Skarn Rock at Nirwand, Patcham Island, Kutchh, Gujarat

Abstract

The alkaline plug of Nirwandh in Patchaam Island, Kutchh district, Gujarat is emplaced within the unmetamorphosed Jurassic limestone of Patcham Formation. A thin band of Tschermaks clinopyroxene (fassaite)-grandite-bearing calc-silicate occurs as skarn rock at the contact of the alkaline plug and limestone sediments. The mineralogical and textural evidences indicate that the rock is evolved by contact metamorphism due to fluid infiltration at shallower depth during very high temperature regime.

Kimberlites, Lamproites, Lamprophyres, Carbonatites, other Alkaline Rocks, and Mafic Dykes from the Indian Shield: Glimpses of Research (2012-2016)

“…The enrichment of incompatible elements in the alkali feldspar syenites is suggestive of the involvement of mantle metasomatism in the genesis of these syenites (Hari et al, 2014). A thin band of Tschermaks clinopyroxene (fassaite)-grandite-bearing calc-silicate skarn rock has been reported at the contact of the alkaline plug and limestone sediments at the alkaline plug of Nirwandh in Patchaam Island, Kutchh district, Gujarat (Maitra and Korakoppa, 2012). The alkaline plug is emplaced within the Jurassic limestone of Patcham Formation..…”

“…The alkaline plug is emplaced within the Jurassic limestone of Patcham Formation.. The mineralogical and textural evidences point out that the skarn rock is evolved by contact metamorphism due to fluid infiltration at shallower depth during very high temperature regime (Maitra and Korakoppa, 2012). A large number of igneous intrusions related to the Deccan magmatism are exposed in the western and central part of the Indian shield.…”