Record Details

Holocene land-sea interactions and landform changes in the coastal lands of Vembanad lagoon, Kerala, SW India

NOPR - NISCAIR Online Periodicals Repository

View Archive Info
 
 
Field Value
 
Title Holocene land-sea interactions and landform changes in the coastal lands of Vembanad lagoon, Kerala, SW India
 
Creator Padmalal, D.
Maya, K.
Mohan, S. Vishnu
Baburaj, B.
 
Subject Holocene land-sea interactions
Landform changes
Vembanad lagoon South west coast of India
 
Description 1152-1156
The
sedimentological, palynological, geomorphological and stable isotope (δ13C
and δ15N) studies of six borehole cores retrieved from the Vembanad
basin together with sedimentological studies of 14 surface sediment samples
collected from the barrier beach separating the lagoon from nearby sea were
analysed for decoding signatures of land – sea interactions in the sedimentary
archives of the area. The radiocarbon age of the subsurface sediments varied
from 10620±160 yrs BP to 3990±150 yrs BP. Stable isotope studies reveal
indications of the dominance of marine components in the basal portions of the
borehole sediments of southern sector. Presence of higher order riparian
vegetation is noticed in central and northern sectors of the basin before the
region being occupied by lagoon waters of the Holocene transgressive phase. The
northward drift of sediments was well represented in the mineralogical
diversities of the heavy mineral residue, in addition to the northerly
deflections of the distributary channels, especially in the northern part of
the basin. The lagoon entrances also showed significant changes during the
Holocene epoch. The prominent entrance of the lagoon till Late Holocene was at
Andhakaranazhi which was indicated by the anomalous presence of pyriboles
(pyroxenes + amphiboles) within the sillimanite dominant domain of the
sub-surface sedimentary archive. This entrance became inactive during the
latter half of the Late Holocene because of sediment build up and subsequent
landform changes. Simultaneously, the entrance at Fort Kochi
was devoloped for the exchange of water between the lagoon and the sea.
 
Date 2016-06-26T19:41:11Z
2016-06-26T19:41:11Z
2014-07
 
Type Article
 
Identifier 0975-1033 (Online); 0379-5136 (Print)
http://hdl.handle.net/123456789/34421
 
Language en_US
 
Rights CC Attribution-Noncommercial-No Derivative Works 2.5 India
 
Publisher NISCAIR-CSIR, India
 
Source IJMS Vol.43(7) [July 2014]