Geological Bulletin, Volume 11University of Peshawar, 1979 - Geology |
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Page 37
... albite are among the alteration products . In some rocks where the plagioclase is fresh , its composition ( based on maximum symmetrical extinction angle on albite twins ) is near An 40 , but in rare cases it is calcic andesine ...
... albite are among the alteration products . In some rocks where the plagioclase is fresh , its composition ( based on maximum symmetrical extinction angle on albite twins ) is near An 40 , but in rare cases it is calcic andesine ...
Page 58
... albite twins is in the range of andesine but in rare cases it is sodic labradorite . The most common twins are according to albite law , followed by those on pericline / acline law ; however , occasional combinations of Carlsbad twins ...
... albite twins is in the range of andesine but in rare cases it is sodic labradorite . The most common twins are according to albite law , followed by those on pericline / acline law ; however , occasional combinations of Carlsbad twins ...
Page 77
... albite or pericline / acline , and only rarely Carlsbad . " Growth twins in igneous crystals are commonly complex ... albite - pericline / acline , a few Carlsbad - albite and , very rarely , Carlsbad - albite - pericline / acline laws ...
... albite or pericline / acline , and only rarely Carlsbad . " Growth twins in igneous crystals are commonly complex ... albite - pericline / acline , a few Carlsbad - albite and , very rarely , Carlsbad - albite - pericline / acline laws ...
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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