5 research outputs found
Magnetic and palaeomagnetic studies as an aid in deciphering groundwater flow: a case study from deccan traps
This paper reports the utility of palaeomagnetic investigations first time in the ground water studies. The magnetic anomalies along with palaeomagnetic studies are used to locate barriers obstructing groundwater flow in a basaltic terrain. Magnetic anomalies in an area of around 4 sq. km in the university campus, Nanded, Maharashtra, India brought out two distinct anomaly closures that can be attributed to bodies with different directions of magnetizations. Palaeomagnetic investigations reveal that the basalts are almost uniformly magnetized, asserting that the anomalies come form the subsurface and the anomalous sources are attributed to weathering of basal basaltic flows. The difference between the measured palaeomagnetic directions of the surface rocks and the observed magnetic anomalies, in corroboration with local geomorphologic conditions and thenature of the basaltic flows in thin basaltic terrains suggest that subsurface weathering plays a major role in the ground water movement. This paper presents a novel idea on the utilization of the palaeomagnetic studies coupled with ground magnetic anomalies in deciphering groundwater flow
MAGNETIC AND PALAEOMAGNETIC STUDIES AS AN AID IN DECIPHERING GROUNDWATER FLOW: A CASE STUDY FROM DECCAN TRAPS
This paper reports the utility of palaeomagnetic investigations first time in the ground water studies. The magnetic anomalies along with palaeomagnetic studies are used to locate barriers obstructing groundwater flow in a basaltic terrain. Magnetic anomalies in an area of around 4 sq. km in the university campus, Nanded, Maharashtra, India brought out two distinct anomaly closures that can be attributed to bodies with different directions of magnetizations. Palaeomagnetic investigations reveal that the basalts are almost uniformly magnetized, asserting that the anomalies come form the subsurface and the anomalous sources are attributed to weathering of basal basaltic flows. The difference between the measured palaeomagnetic directions of the surface rocks and the observed magnetic anomalies, in corroboration with local geomorphologic conditions and thenature of the basaltic flows in thin basaltic terrains suggest that subsurface weathering plays a major role in the ground water movement. This paper presents a novel idea on the utilization of the palaeomagnetic studies coupled with ground magnetic anomalies in deciphering groundwater flow
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Evolution of Proterozoic mafic dyke swarms of the Bundelkhand Granite Massif, Central India
The early Proterozoic Bundelkhand Granite Massif of
Central India is extensively intruded by NW–SE and
NE–SW trending mafic and ultramafic dykes. These
dykes are mostly dolerites with subordinate pyroxenite
or lamproites, and geochemical signatures are different
for the NW–SE and NE–SW trending dyke suites.
40Ar/39Ar age determinations of the dolerite dykes
suggest two phases of dyke activity at ca. 2150 Ma and
2000 Ma and supported by palaeomagnetic results in
this region. Apart from other magmatic emplacements,
there are younger deformational events recorded by
minerals (1800 Ma event recorded by some mafic regions
of dykes and 692–750 Ma given by plagioclase feldspars) subsequent to their magmatic emplacements. The dolerites are typically tholeiites and quartz normative types, while the ultramafics are komatiite or basaltic komatiite in composition and show an olivinenormative character. Most of the tholeiites display incompatible elements pattern indicative of an enriched mantle source, while those of the ultramafics indicate a depleted source