Geological Bulletin, Volume 11University of Peshawar, 1979 - Geology |
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Page 9
... usually form a confused mixture with the flows . The ignimbritic character in`the tuffs is quite prevalent . Due to fine texture and intense alteration , it becomes difficult to decipher various cycles of volcanism with authentisity ...
... usually form a confused mixture with the flows . The ignimbritic character in`the tuffs is quite prevalent . Due to fine texture and intense alteration , it becomes difficult to decipher various cycles of volcanism with authentisity ...
Page 92
... usually in minor quantity or absent whilst some of the rocks contain only one of the two named hydrous minerals . Jan and Kempe ( 1973 ) regarded the rocks to have been originally , without exception , pyroxene diorites and the ...
... usually in minor quantity or absent whilst some of the rocks contain only one of the two named hydrous minerals . Jan and Kempe ( 1973 ) regarded the rocks to have been originally , without exception , pyroxene diorites and the ...
Page 105
... usually less than 1.8 metres accross and in some the orbicules are highly concentrated . The orbicules are usually subrounded to ellipsoidal in shape . They are of various dimensions , ranging from 2 to 25 cm in size , many are up to 12 ...
... usually less than 1.8 metres accross and in some the orbicules are highly concentrated . The orbicules are usually subrounded to ellipsoidal in shape . They are of various dimensions , ranging from 2 to 25 cm in size , many are up to 12 ...
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Common terms and phrases
abundant amphibole amphibolites andesite anorthosite assemblages associated Bajaur Baltistan bands Baraul belt biotite Bull calc-alkaline Chaudhry Chitral chlorite clinopyroxene coarse-grained composition contain Cretaceous Desio Diwangar epidote fault feldspar foliation Formation garnet granulites Geol Geology Gilgit gneisses gneissose grains granitic rocks Granodiorite granulites green Greenstone Complex grey Group Hazara Himalaya hornblende hypersthene igneous Indo-Pakistan Indus valley intrusions island arc Jan and Mian Jandul Kakar Kalam Karakoram Khan Kohistan layers limestone mafic magma Main Mantle Thrust margins metamorphic metasedimentary rocks metasediments mica Nanga Parbat norites occur opaque minerals orthopyroxene outcrops Pakistan pegmatites peridotites Peshawar Petrography petrology plagioclase plate pyroxene pyroxene granulites pyroxenites quartz diorites quartzites rarely region Reshun rutile schists sequence SiO2 slates southern sphene structure suture zone Swat Kohistan syntaxis Tahirkheli tectonic Tertiary texture thick trend tuffs twinning ultramafic rocks Univ Upper Swat Ushu Gol Utmankhel veins vicinity volcanic rocks whilst xenoliths Yasin