Petrological studies of Angadimogar quartz-syenite intrusive, Kasaragod District, Kerala, India.
Author(s):
V. Sai Krishna Priya, K. Rajensra Prasad, M. Srinivas
Keywords:
quartz syenite, syeno granite, Angadimogar Pluton, Kasaragod, Kerala.
Abstract
Neo-Proterozoic aged Syenite and alkali granite intrusions with strong alkaline characteristics sporadically penetrate the granulitic terrain of SW India. These intrusions, found in the Precambrian terrain, remain unaltered by metamorphism or deformation, displaying a distinct alkalic signature. They are closely associated with taphrogenic faults and regional lineaments. Among them, the Angadimogar intrusive (AM) [12⁰38’N - 75⁰00’E] in the Kasaragod district of Kerala is one of 18 bodies that have punctured the Peninsular shield of India, preserving evidence of significant felsic magmatic activity. The AM pluton is positioned near the continental margin, along a fault lineament trending NW-SE. The AM pluton consists of 3 types of rocks that are quartz syenite, quartz monzonite and syeno granite, they show medium to coarse grained texture, and are predominantly composed of K-feldspar ranging from 35 to 63%, with subordinate amounts of quartz 5-18%, plagioclase 1-27%, and ferromagnesian minerals such as amphibole biotite ranging from 5 to 30%. Accessories like magnetite, sphene, apatite, and zircon are also present.
Article Details
Unique Paper ID: 164057

Publication Volume & Issue: Volume 10, Issue 12

Page(s): 25 - 29
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