Journal of Geological Society of India (Online archive from Vol 1 to Vol 78)

M. Masroor Alam ¹, A. H. M. Ahmed ², M. Haris A. Khan ²

Affiliations
1 Geology Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh - 202 002, (U.P.), IN
2 Department of Geology, Aligarh Muslim University, Aligarh - 202 002, (U.P.), IN

Abstract

The lower Jurassic Lathi Formation forms the lower part of the Jaisalmer basin and comprises 360 m thick succession of medium to coarse grained sandstones with interbeds of shale, claystone and occasional lignite. The rocks are exposed amidst desert sand as low mounds and in shallow stone quarries. The sandstones were deposited in shallow marine to deltaic depositional environments. Our study deals mainly with the identification of various diagenetic features such as cements and their paragenesis, compaction, depth of burial and porosity evolution. The sandstones are marked by iron oxide, calcite, silica and dolomite cements. Compaction is mainly mechanical with a depth of burial in the range of 725-1125 m. The sandstones show good amount of porosity with an average of 13.3%. Porosity reduction is mainly due to early stage of mechanical compaction and subsequent pervasive calcite and iron oxide cementation.

Keywords

Lathi Formation, Diagenetic Features, Compaction, Cementation, Porosity, Depth of Burial.

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