Diagenetic Features of Jurassic Fort Member Sandstone, Jaisalmer Formation, Western Rajasthan
Authors
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Department of Geology, Aligarh Muslim University, Aligarh - 202 002 (U.P.)
Faiz Ahmad -
Department of Geology, Aligarh Muslim University, Aligarh - 202 002 (U.P.)
A. H. M. Ahmad
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Department of Geology, Aligarh Muslim University, Aligarh - 202 002 (U.P.)
M. A. Quasim
DOI:
https://doi.org/10.1007/s12594-017-0715-7Abstract
Jaisalmer Formation consists of 360m thick succession of medium to coarse grained sandstones with interbeds of shale, claystone and occasional lignite that rest over Lathi Formation, is the basal part of the Jaisalmer basin. The rocks are exposed amidst desert, low mounds and shallow stone quarries. Sandstones were deposited in shallow marine to deltaic environments. The studied sandstones consist of abundant quartz followed by feldspar, mica, chert, rock fragments and heavy minerals. The study mainly deals with identification of various diagenetic features such as compaction, cementation and porosity evolution. During mechanical compaction rearrangement of grains took place and point, long and suture contacts were formed. The sandstones are cemented by iron oxide, silica overgrowth, carbonate and clay. Porosity has developed due to dissolution of iron, carbonate cement and feldspar grains. Dissolution and alteration of feldspar, lithic fragments and pressure solution were the main source of quartz cements. The sandstones show good amount of existing optical porosity with an average of 7.19%. Porosity reduction is mainly due to early stage of mechanical compaction and subsequent pervasive calcite and iron oxide cementation. Further, porosity reduced due to deposition of clay cement.
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