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Avasia, R. K.
- Nepheline Syenite in the Deccan Traps of Jawhar, Bombay
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Authors
Affiliations
1 Geology Department, St. Xavier's College, Bombay, IN
1 Geology Department, St. Xavier's College, Bombay, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 7 (1966), Pagination: 86-91Abstract
The paper records the occurrence of nepheline syenite noticed as a narrow vertical dyke in the Deccan Trap area near Khuded, about 90 miles north-east of Bombay. A full description is given of the nepheline syenite, including its physical, chemical and optical characters; and on the basis of these data, the mode of origin of this nepheline syenite and its age relationship with reference to the adjacent Deccan basalts are discussed.
- Pyroxenes from Alkaline Rocks of the Chhota Udaipur Carbonatite-Alkaiic Province, Gujarat, India
Abstract Views :182 |
PDF Views:1
Authors
Affiliations
1 Geology Department, St. Xavier's College, Bombay, IN
1 Geology Department, St. Xavier's College, Bombay, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 39, No 4 (1992), Pagination: 313-319Abstract
The Amba Dongar, Sirivasan and Panwad-Kawant carbonatite-alkalic complexes have close spatial relation. In Amba Dongar olivine-free nephelinite is the predominent type of alkaline rock with a few phonolite dykes; in Sirivasan tinguaite is more abundant than nephelinilte while in Panwad-Kawant region bulk of the alkaline rocks is made up of phonolite and tinguaite. The chemistry of the pyroxenes of these alkaline rocks has been interpreted and their evolutionary trends are discussed. The pyroxenes of Amba Dongar and Sirivasan complexes show early acmitic trend with phenocrysts being more calcic. The groundmass pyroxenes are more acmitic. The pyroxenes of the Panwad-Kawant complex, on the other hand, are less evolved diopsidic-salite type, showmg only slight initial hedenbcrgite enrichment and the final aemitic enrichment. These two trends are attributed to varying crystallizing conditions of the two batches of the same magma.Keywords
Amba Dongar, Sirivasan, Nephelinite, Phonolite, Carbonatite, Alkaline Rocks Gujarat.- Extrusive Phase of Carbonatite-Alkalic Activity in Amba Dongar Complex, Chhota Udaipur, Gujarat
Abstract Views :185 |
PDF Views:127
Authors
Affiliations
1 Department of Geology, St. Xavier's College, Mumbai - 400 001, IN
2 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
3 Bhabha Atomic Research Centre, Trombay, Mumbai, IN
1 Department of Geology, St. Xavier's College, Mumbai - 400 001, IN
2 Physical Research Laboratory, Navrangpura, Ahmedabad - 380 009, IN
3 Bhabha Atomic Research Centre, Trombay, Mumbai, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 66, No 3 (2005), Pagination: 273-276Abstract
It is noteworthy that Amba Dongar carbonatite complex has both intrusive and extrusive phase carbonatites. The stratified tuff with components of both carbonatite and nephelinite have been recently traced in western part of Amba Dongar complex. In this preliminary report we present trace and rare earth elements data and C and O isotopes of these tuffs. The C and O isotopes of the least altered tuff falls within the mantle box while the remaining samples plot in the narrow field of 16-20% in oxygen. These values are explained using simple model of water-Rock interaction.Keywords
Carbonatites, Extrusive Phase, Amba Dongar, Gujarat.Full Text