Geological Bulletin, Volume 14University of Peshawar, 1981 - Geology |
From inside the book
Results 1-3 of 5
Page 34
The latter , usually , has a reverse pleochroic scheme ( a > y ) compared to
common biotite ( y > a ) and , thus , looks like astrophyllite under the microscope .
Apatite may be fractured , filled with carbonate , and in some cases is
concentrated in ...
The latter , usually , has a reverse pleochroic scheme ( a > y ) compared to
common biotite ( y > a ) and , thus , looks like astrophyllite under the microscope .
Apatite may be fractured , filled with carbonate , and in some cases is
concentrated in ...
Page 36
Tr of Plg , Epi , Pyr 93 - 6 KASC 25 - 6 / 78 91 3 - 4 - 2 Dark mica , usually Ti -
bearing phlogopite , is usually less than 3 % but in some up to 8 % . The
carbonate is usually more than 70 % except in the apatite - amphibole type . It is
commonly ...
Tr of Plg , Epi , Pyr 93 - 6 KASC 25 - 6 / 78 91 3 - 4 - 2 Dark mica , usually Ti -
bearing phlogopite , is usually less than 3 % but in some up to 8 % . The
carbonate is usually more than 70 % except in the apatite - amphibole type . It is
commonly ...
Page 38
They are generally medium - grained and dark brownish in colour , and show
obvious effects of solution activity . Dark mica ( usually biotite but in a few , e . g .
C 23 - 27 / 77 , phlogopite ) in these rocks may be phenocrystic and is usually 20
...
They are generally medium - grained and dark brownish in colour , and show
obvious effects of solution activity . Dark mica ( usually biotite but in a few , e . g .
C 23 - 27 / 77 , phlogopite ) in these rocks may be phenocrystic and is usually 20
...
What people are saying - Write a review
We haven't found any reviews in the usual places.
Contents
The Geology and Petrography of the Tarbela Alkaline Complex | 1 |
Petrography of the Loe Shilman Carbonatite Complex Khyber Agency | 29 |
Major Elements Abundance in the Kalam Lavas | 45 |
Copyright | |
12 other sections not shown
Other editions - View all
Common terms and phrases
abundant albite albitites alkaline altered amphibole andesite apatite associated band basic beds belt biotite bodies brown Bull calcite carbonate carbonatite chemical chlorite complex composition consist contain deposits described detailed developed diorites dolomite epidote et al fault feldspar field Formation gabbroic Geol Geology gneisses grains granites granitic rocks green Himalayas hornblende igneous indicate Indus intrusions island arc Jurassic Kalam Karakoram Kempe Kohistan Late Limestone locally lower magmatic magnetite major margin metamorphism microfacies minerals minor muscovite normal northern obducted occur origin outcrop Pakistan Peshawar petrography phases plagioclase Plate Pleistocene present pyrite pyrochlore quartz quartzite range region reported river rocks samples sandstones schists sediments sequence sericite shales similar Siwalik sphene structure suggest Swat syenites Table Tahirkheli Tarbela tectonic thick thin Traces Univ University Upper Valley varieties veins volcanic Warsak West zone