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Somayajulu, B. L. K.
- North America and Adjacent Oceans During the Last Deglaciation
Authors
1 Physical Research Laboratory, Ahmedabad - 380 009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 32, No 2 (1988), Pagination: 151-151Abstract
No Abstract.Full Text
- Geochronology of Miliolite Rocks of Kutch, Western India
Authors
1 Physical Research Laboratory, Ahmedabad 380009, IN
2 KDMIPE, Oil and Natural Gas Commission, Dehra Dun 248195, IN
3 Post-Graduate and Research Institute, Deccan College, Pune 411 006, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 33, No 6 (1989), Pagination: 588-593Abstract
Preliminary geochemical, mineralogical and geochronological studies using 230Th/234U method, of nine rniliolite rocks from Kutch are reported. The Kutch miliolites are characterised by lower CaCO3and higher quartz contents compared to their Saurashtra counterparts. The range of ages for the Kutch and Saurashtra miliolites are same and both can be accommodatedin the 50-70, 75-115 and > 140 K. Yr age groups proposed by Baskaran (1985).The origin of the Kutch miliolites, like those of Saurashtra, appears to be marine. Theories to explain their occurrence in Kutch have to await more detailed studies of this type alongwith ichnological and petrographic observations.
- Clay Mineral Distributions in Dated Miliolites of the Late Quaternary from Saurashtra and Kutch, Gujarat
Authors
1 Physical Research Laboratory, Ahmedabad 380009, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 35, No 5 (1990), Pagination: 471-479Abstract
Forty-three dated miliolites (ages ranging from 30-235 kyr) of the late Quaternary period, from Saurashtra and Kutch regions of Gujarat State have been analysed for their detrital contents as well as for the four clay minerals, smectite, illite, kaolinite, and chlorite in the less than 2 micron fraction.
Between 235 kyr and 140 kyr BP. there was less detrital material available in the regions of miliolite formation. Landward and seaward sources, notably from southeast and northwest directions contributed equally efficiently to the clay component of the detritus resulting in illite smectite ratio of 1.0. This situation prevailed during 70-50 kyr BP as well as at around 12 kyr BP except that the total detritus in miliolites increased by a factor of about three, during the two recent periods. However, during 95-115 kyr BP, despite the high detrital content of 24%, the illite/smectite ratio dropped to 0.3 indicating the expected dominance of the local and southeastern sources which are enriched in smectite in their clay fractions.