Enayam Port

Tamil Research Institute
RAPID TECHNO-ECONOMIC FEASIBILITY REPORT FOR
DEVELOPMENT OF COLACHEL PORT AT TAMILNADU
FINAL REPORT
interpretation of Satellite imagery are 1) Structural Hills 2) Bazada 3) Valley Fill, 4) Flood Plain 5) Pediment, 6)
Shallow Buried Pediments, 7) Deep Buried Pediments, and 8) Coastal Plain.
The geology of this district is comprises of the following rocks/sediments:
Precambrian Crystalline: Precambrian crystalline rocks, which consist of khondalites, gneisses and
incipient charnockites, have significant composition in this region.
Basic Intrusives: Basic intrusives like gabbro and dolerite are present in the Precambrian crystalline rocks.
Neogene Sedimentary Rocks: Neogene sedimentary rocks are present in the coastal region. It
comprises of carbonaceous clays with lignified tissues/coal seams, china clay and friable sandstone.
Laterites: Laterites are of the recently formed litho units, which are formed above the Precambrian
crystallines and Tertiary sedimentaries.
Quaternary Sediments: Quaternary sediments like sand bars, sandy hats, alluvial sands and lacustrine
deposits. These sediments are found in patches and are separated by laterites.
3.2.2.3. Seismicity and Earthquake
The seismo-tectonic faults and earthquake zonation is shown in next figure. From the map it is evident that no
major/regional seismically active faults, thrusts or trenches are present in the project area. The proposed project
area is located in Zone III - the moderate damage risk zone.
3.2.2.4. Soils
Figure 16. Seismic and Earthquake Zones and Regional Faults in Tamil Nadu and Kerala.
To assess the soil quality of the project area, the physico-chemical and fertility characteristics of the soils within
the study area were examined by specific studies in the Kanyakumari area. Soil texture of the area varied from
sandy clay loamy to loamy. Soil pH was observed to be neutral to slightly alkaline. Electrical conductivity varied
from 100 to 250 μS/cm. Organic matter content in the soil samples, which indicates the soil fertility, was
observed to be very variable, high in some places and in other sites it was observed to be comparatively low,
indicate the poor fertility of the soil in these areas.
CP1832-FR-AX-05-CP-Initial Environmental Examination-Ed4.docx AX05 - 31
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