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Early Miocene shell concentration in the mixed carbonate-siliciclastic system of Kutch and their distribution in sequence stratigraphic framework

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Title Early Miocene shell concentration in the mixed carbonate-siliciclastic system of Kutch and their distribution in sequence stratigraphic framework
 
Creator KUMAR, P
SARASWATI, PK
BANERJEE, S
 
Subject bivalve taphonomy
western india
paleobiology
settings
kachchh
beds
shell concentration
mixed carbonate-siliciclastic system
systems tract
early miocene
kutch
gujarat
 
Description The Early Miocene succession of Kutch represents a mixed carbonate-siliciclastic depositional system. The carbonate part of the succession, characterized by high abundance of shallow marine benthic fauna, hosts typical shell concentrations (also referred as shell beds). The thickness of shell concentrations vary in scale from 5 cm to 100 cm and are separated by poorly fossiliferous to barren silty shales/siltstones. Based on taphonomic and sedimentological observations, shell concentrations are classified as lag, event, composite/multi-event and hiatal types. The occurrence of different types of shell concentrations in the background of sequence stratigraphic framework is the main theme for the present study. Overall, the shell concentrations occupy the middle part of the sequence i.e. upper part of the transgressive systems tract and lower part of the highstand systems tract. Lag concentrations are found in the lower part of the sequence while composite concentrations, the major contributors in the sequence, occur in upper part of the transgressive systems tract and in the lower part of the highstand systems tract. The hiatal concentrations are associated with maximum flooding surface while the position of event concentrations is independent of sequence stratigraphic framework. The shell concentrations occupy marine flooding surface or marine ravinement surface, thus mark parasequence boundaries.
 
Publisher SPRINGER INDIA
 
Date 2011-08-30T05:47:11Z
2011-12-26T12:58:47Z
2011-12-27T05:49:19Z
2011-08-30T05:47:11Z
2011-12-26T12:58:47Z
2011-12-27T05:49:19Z
2009
 
Type Article
 
Identifier JOURNAL OF THE GEOLOGICAL SOCIETY OF INDIA, 74(4), 432-444
0016-7622
http://dx.doi.org/10.1007/s12594-009-0158-x
http://dspace.library.iitb.ac.in/xmlui/handle/10054/12212
http://hdl.handle.net/10054/12212
 
Language en