Record Details

Occurrence of rhyolytic tuffs at deep sea drilling project site 219 on the Laccadive Ridge

DRS at CSIR-National Institute of Oceanography

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Title Occurrence of rhyolytic tuffs at deep sea drilling project site 219 on the Laccadive Ridge
 
Creator Siddiquie, H.N.
Sukheswala, R.N.
 
Subject Geology and Geophysics
Geology and Geophysics
deep sea drilling
petrology
mineralogy
texture
palaeo studies
ISW, Laccadive
 
Description A study of thin sections from the lower and middle parts of Unit 5 (Paleocene) from Site 219 shows that these largely consist of acidic or rhyolitic tuffs. The overlying limestones in Unit 5 (Paleocene) and Unit 4 (Lower Eocene) also contain tuffaceous material in varying proportions. Albite/oligoclase forms the phenocrysts as also needles in the groundmass of these tuffs and tuffaceous material in limestones. The euhedral fresh felspars suggest that the source of activity was nearby and possibly most of the activity was subaqueous rather than subaerial. Similar acidic tuffs in the Deccan Traps have been reported particularly from the West Coast of India. The acidic tuffs at site 219 are of the same age as the Deccan Traps and may represent a late phase of Deccan Trap activity on the Laccadive Ridge before its subsidence and separation from peninwular India
 
Date 1997-11-26T09:56:51Z
2017-09-29T13:47:05Z
1997-11-26T09:56:51Z
2017-09-29T13:47:05Z
1976
 
Type Journal Article
 
Identifier Journal of the Geological Society of India, vol.17(4); 1976; 539-546
0016-7622
http://drs.nio.org/drs/handle/2264/5516
 
Language en
 
Relation J Geol Soc India
SCI
 
Publisher Geological Society of India