Himalayan Geology, Vol. 32
(2), 2011, pp. 169-171, Printed in India
Short Note: Is chert breccia at Kalakot, J&K Sedimentary in Origin?
MATSYENDRA K. SHUKLA, N. SIVA SIDDAIAH
Wadia Institute of Himalayan Geology, Dehra Dun - 248 001, India
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Abstract : Chert breccia that occurs between Precambrian Sirban
Limestone and Late Paleocene –Middle Eocene Subathu Formation at Kalakot
village in Jammu & Kashmir was studied for its mineralogy and texture by
optical microscopy. It consists dominantly of quartz followed by feldspar,
rutile, magmatic zircon, biotite, tourmaline and pyrite. Hexagonal
dipyramidal quartz and quartz-eye textures are common in Kalakot chert
breccia. Volatile rich melt inclusions occur within the quartz. The
characteristic features of quartz and accessory minerals like rutile,
magmatic zircon, biotite, pyrite and tourmaline clearly contradict the
previous view of sedimentary origin of this breccia.
Keywords: Breccia, quartz- textures, Kalakot, Himalaya.