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Algal microboring on ooids: An evidence of Holocene sea transgression in eastern India

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Title Algal microboring on ooids: An evidence of Holocene sea transgression in eastern India
 
Creator Bandyopadhyay, Amitava
De, Chirananda
 
Description 181-184
Ooid
concentrated sediments occur at about 75 and 120 m depths on the outer
continental shelf off Chennai. They are associated with sediments containing
predominantly of terrigenous and authigenic green clay facies . Quartz,
foraminifers and green grains are present in the nucleus of the ooids. SEM
studies on the surfaces of ooids revealed pits formed mechanically in high
energy conditions and pits and channels tailored by endolithic algae. Ooids
associated with microborings probably indicate their formation in shallow
marine environment and their concentration at two specific depths indicate sea
level still stands close to ooid depths. Presence of terraces and reefal
barriers at depths around 60 and 110 m on this margins also support
palaeo-strand lines at these depths and ooid formation in two successive phases
of Holocene transgression.
 
Date 2014-01-07T12:27:26Z
2014-01-07T12:27:26Z
2000-06
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/25342
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.29(2) [June 2000]