Records of the Geological Survey of India, Volume 139, Part 5The Survey, 2006 - 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 61
... veins generally vary in thickness from a few mm to maximum 20 cm . Due to pinching and swelling , folding and shearing , the thickness of the vein varies greatly . The quartz vein on both the walls of the trench shows branching and ...
... veins generally vary in thickness from a few mm to maximum 20 cm . Due to pinching and swelling , folding and shearing , the thickness of the vein varies greatly . The quartz vein on both the walls of the trench shows branching and ...
Page 104
... veins as well as in the altered country rocks . At the contact of the hanging wall and footwall zones , the quartz veins exhibit well - developed brecciation , sericitisation and intense limonitisation . Anastomising hydrothermal vein ...
... veins as well as in the altered country rocks . At the contact of the hanging wall and footwall zones , the quartz veins exhibit well - developed brecciation , sericitisation and intense limonitisation . Anastomising hydrothermal vein ...
Page 117
... veins in the bands analysed 0.83 to 146.30 ppm Au and the wall rock , 0.46 to 3 ppm . Since both the host rock and the quartz veins have been found to be mineralized , the area was taken up for detailed exploration by drilling to find ...
... veins in the bands analysed 0.83 to 146.30 ppm Au and the wall rock , 0.46 to 3 ppm . Since both the host rock and the quartz veins have been found to be mineralized , the area was taken up for detailed exploration by drilling to find ...
Contents
ANDHRA PRADESH | 1 |
Quaternary Geology | 9 |
Project National Geochemica Mapping NGCM | 16 |
Copyright | |
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abutment alignment amphibolite Andhra Pradesh assess bands basin bed rock biotite biotite gneiss block boreholes carried charnockite coast cut-off trench depth district dolerite drilled dunes dyke earth dam enclaves excavation exposed field season folds foliation Formation foundation fresh rock garnet Geochemical Mapping geological mapping GEOTECHNICAL INVESTIGATION gneiss gold grained granite granite gneiss granitoids granodiorite granulite gravity grouting holes hornblende indicated intrusive Item joints Karnataka Kerala Khondalite kimberlite laterite limestone lithounits located lugeons mafic metabasalt migmatite mineralisation minerals moderate mylonite NNW-SSE NW-SE occur overburden pegmatite penstock permeability tests phyllite powerhouse project authorities proposed pyroxene quartz quartz veins quartzite reservoir river samples were collected sand schist belt shale shear zone shotcrete slope soil Specialised Thematic Mapping spillway STAGE GEOTECHNICAL stream sediment samples strike structure studies sulphide surface Tamil Nadu thick toposheet traverse trending tsunami ultramafic upto values varying vertical weathered weir width