Variolithic lavas of basalts of the Mauranipur greenstone belt of the Bundelkhand craton, Indian Shield
The pillow and massive variolitic lavas with the signs of silicate immiscibility were documented firstly for the Mesoarchean basalt series from Mauranipur greenstone belt. The silicate immiscibility is indicated by occurrence of the varioles (globules) with the differing chemical composition compared to matrix along with the coalescence processes marked by the formation of lense clusters in the cores of the pillow lavas and top of the lava flows. The formation of the variolated structure might be caused by the «low-temperature» metastable liquation occurring «in situ» within the lava flows, lava beds and lava pillows after eruption.