Characters | Kaman-Shilotter | Sativli 194 hill | Saphale | Nandgaon Murba |
Clast/fragment size | Average size 2 to 64 mm 10% to 15% > 64 mm, maximum lm | 2 to 64 mm | Upto 64 mm | Murba, mainly lapilli size max. 64 mm |
Composition of clast | Basalt, dolerite gabbro, subordinate cherty, siliceous. | Basalt, dolerite, gabbro, diorite, cherty, pumice | Basalt, GPB, gabbro, diorite, dolerite. | Tuffaceous lapilli, basalt, subordinate gabbro, |
Shape of Pyroclasts | Sub-angular to angular, bigger ones are more angular, chilled margms | Bombs of various shapes, fragments of bombs, smaller fragments angular. | Subangular to blocky, basaltic blocks | Various shaped bombs, ribbon, spherical and spindle. |
Matrix | Basaltic, gray with angular clasts of cherty and soot material, size gradation at places | Tuffaceous glassy, small lapilli of siliceous material with chilled margins | Basaltic, occasional radish clayey muddy. | Basaltic, occasionally muddy. |
Welding, compaction, cohesiveness | Cohesive with magmatic character, finer flows have tuffaceous matrix. | Very well welded glassy nature, coarser parts are magmatic and cohesive. | Well consolidated, open framework. | Vitreous nature, magmatic with patches of muddy matrix, less welded |
Depositional structures | Massive with occasional gravity bedded, basalt boulders aligned parallel to beds, vitreous tuff beds | Massive, small sectors contain compositionally banded tuffs with planar bedding, bedding sags | Non bedded massive | Massive non bedded |
Geometry of the deposit | Sheet, with localized circular to semicircular out crop. | Sheet, inter-layered with tuffs | Wedge shaped with circular out crops | Lenticular, lensoid. |
Associated facies | Basalticflows, pumiceous layer on top, pockets of tuff present, interlayered with basic vitric tuff bands, acidic dykes | Thinly bedded compositionally banded tuffs, basalt flows, acidic dykes. | Basaltic flows, gabbro intrusives. | Basaltic flows, plugs of basaltic nature dyke swarm. |
Vesicularity of clasts | Scoraceous | Vesicular basalt fragments., small pumice fragments, vesiculated acidic tuff fragments with non vesicular blocks and smaller fragments of all. | Scoraceous fragments of basalt and soot material occasional pumice fragments along with non vesicular fragments. | Scoraceous basalt fragments and scoraceous lava soot material, occasional pumice fragments Besides non vesicular fragments of all. |
basalt, pumice, vesiculated tuffaceous clasts, non-vesicular blocks of dolerite, gabbro, and acidic rocks and vein quartz. | ||||
Relation with the associated facies. | Gradational, conformable and interfingering relation with the associated rocks | Conformable but not gradational, interlayerd with compositionally banded and felsic/flows | Gradational with basalt. Housed within the basaltic pile. | Gradational with the basalt flows, encompassed within the flows itself. |