Records of the Geological Survey of India, Volume 113, Part 4The Survey, 1984 - Earthquakes Vols. 1- include Report of the Geological Survey, 1867- ; v. 32- include Review of the mineral production of India, 1898/1903- ; v. 75 consists of Professional papers, no. 1-16; v. 76 consists of Bulletins of economic minerals. |
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Page 25
... places developed within pyroxe- nite which contains around 10-20 % magnetite . In the ijolite - rich zone , pyroxenite grade to alkali pyroxenite with development of strongly pleo- chroic , prismatic grains of aegirine augite and at pla ...
... places developed within pyroxe- nite which contains around 10-20 % magnetite . In the ijolite - rich zone , pyroxenite grade to alkali pyroxenite with development of strongly pleo- chroic , prismatic grains of aegirine augite and at pla ...
Page 25
... places highly altered to mica- ceous and zeolitic ( natrolite ) material . Oriented fine needles ( ? aegirine ) are sometimes ob- served in some nepheline grains . Aegirine augite ( ZA c = 52 ° + , X = green , Z = yellowish green ) is ...
... places highly altered to mica- ceous and zeolitic ( natrolite ) material . Oriented fine needles ( ? aegirine ) are sometimes ob- served in some nepheline grains . Aegirine augite ( ZA c = 52 ° + , X = green , Z = yellowish green ) is ...
Page 51
... places . Basaltic to andesitic flows are the predominant constituents . These include ' aa ' and ' pahoehoe ' types of flows . Flow breccia on the top of ' aa ' flows and red bole - like glassy crust of flows are seen at many places . A ...
... places . Basaltic to andesitic flows are the predominant constituents . These include ' aa ' and ' pahoehoe ' types of flows . Flow breccia on the top of ' aa ' flows and red bole - like glassy crust of flows are seen at many places . A ...
Contents
GEOLOGICAL SURVEY OF INDIA | 1 |
Problems of correlation of PreGondwana rock units of Arunachal Pradesh and adjoining areasa review | 15 |
The Abor Group of rocks in Arunachal Pradesh | 48 |
7 other sections not shown
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Common terms and phrases
Abor Volcanic Arunachal Pradesh assemblage associated axial bands basement bedrock beds belt biotite bore holes Buxa carbonatite Chattopadhyay chert chromite coal seam coalfields complex correlation Cretaceous crystalline Daling Darjeeling developed Disangs dykes exploration fault folds Formation Gamnom garnierite geochemical Geol Geological Survey GHOSH gneiss goethite Gondwana Grade grains granite Group Himalayas horizon ijolite Khasi limestone lineaments Lohit Lohit district Manipur Manipur East Maskut Meghalaya metamorphic migmatites mineral Mishmi Naga Hills Nagaland Nandy nepheline Ni-content North Eastern occur ophiolite ophiolite suite overburden phase Phokphur Plate postulated pyroxene pyroxenite quartz quartzite Ranga valley reflected refraction regional river rocks samples sandstone schist seam/s sedimentary sediments sequence serpentinite shale Shillong Siang district sillimanite Sirohi soil profile Sonapahar stratigraphic structural studies sub-surface Subansiri district Sung Valley Survey of India tectonic Tertiary thickness thrust Tidding serpentinites tion trending ultramafics Unpublished GSI Report upto veins zone