Geological Bulletin, Volume 5University of Peshawar - Geology |
From inside the book
Results 1-3 of 10
Page 36
... twinned than in diorites ; it appears that stresses were a hindrence in the development of twinning . It may , however , be mentioned that , in some cases , these characters are not strong enough to tell apart one from the other ...
... twinned than in diorites ; it appears that stresses were a hindrence in the development of twinning . It may , however , be mentioned that , in some cases , these characters are not strong enough to tell apart one from the other ...
Page 42
... twinning . The anorthite content could be deter- mined in only a few cases and the plagioclase is either andesine or oligoclase . The amphibole of the rocks is occasionally - twinned hornblende but in many it is altered to a fibrous ...
... twinning . The anorthite content could be deter- mined in only a few cases and the plagioclase is either andesine or oligoclase . The amphibole of the rocks is occasionally - twinned hornblende but in many it is altered to a fibrous ...
Page 140
... twinning and others also have Carlsbad twinning . In- clusions of magnetite and secondary chlorite are present in most of the oligoclase phenocrysts , many of which have sharp boundaries with the groundmass while others are corroded ...
... twinning and others also have Carlsbad twinning . In- clusions of magnetite and secondary chlorite are present in most of the oligoclase phenocrysts , many of which have sharp boundaries with the groundmass while others are corroded ...
Contents
Vol | 1 |
Vol | 5 |
Petrography of the upper part of Kohistan and southwestern Gilgit | 27 |
4 other sections not shown
Other editions - View all
Common terms and phrases
abundant Ahmad Ali Masjid altered amphibole amphibolites Attock Attock Slates Attock-Cherat Range bands biotite Bull calcareous calcite carbonate Carboniferous Cherat chlorite colour correlated Cretaceous cross-bedding Darwazai deposits Devonian diorites dolomite epidote exposed feet thick feldspar fossils fractures garnet Geol geology Gilgit Agency gneisses grains granitic green grey Hazara District hornblende Ibid igneous India Indus River intrusions Jamrud Jan and Tahirkheli Jour Khan Khattak Khewra Formation Khwar Khyber Agency Kohat Kohistan Landikotal Slate limestone lithological Manki Slate Masjid Formation metamorphism metasedimentary miles minerals minor Mohmand Agency muscovite nala norites Nowshera occur outcrops Palaeozoic Paleocene Panjab Univ pegmatites Peshawar phyllites plagioclase pyroxene quartz quartzite reef region Rehman Ripple Marks rocks Salt Range sandstone Schistose Group schists sedimentary Shagai Shagai Limestone Shah Dheri shale Silurian Siluro-Devonian slaty shale Stauffer stratigraphic structures Surv Tertiary thin bedded Thin Section ultramafic veins weathered West Pakistan yellowish