Geological Bulletin, Volume 11University of Peshawar, 1979 - Geology |
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Page 58
... altered . Minor biotitic mica and chlorite have also been noted in a few altered feldspars . The composition of the plagioclase determined from symmetrical extinction angles on albite twins is in the range of andesine but in rare cases ...
... altered . Minor biotitic mica and chlorite have also been noted in a few altered feldspars . The composition of the plagioclase determined from symmetrical extinction angles on albite twins is in the range of andesine but in rare cases ...
Page 80
... altered along grain margins , fractures , and cleavages . The alteration product is normally serpentine ( rarely talc ) and magnetite . In a few the alteration is intense and covers the whole grains , and the serpentine may be enveloped ...
... altered along grain margins , fractures , and cleavages . The alteration product is normally serpentine ( rarely talc ) and magnetite . In a few the alteration is intense and covers the whole grains , and the serpentine may be enveloped ...
Page 94
... alteration product after it and , in a few rocks , is accompanied by sphene muscovite and epidote , or prehnite . In SK 705 , the biotite is completely altered to a fine - grained material composed of reddish iron oxide or hydroxide and ...
... alteration product after it and , in a few rocks , is accompanied by sphene muscovite and epidote , or prehnite . In SK 705 , the biotite is completely altered to a fine - grained material composed of reddish iron oxide or hydroxide and ...
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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