Crustal structure associated with Gondwana graben across the Narmada-Son lineament in India: An inference from aeromagnetics

Rao, D. Atchuta; Babu, H. V. Ram; Sinha, Gautam

doi:10.1016/0040-1951(92)90148-y

Cited by 11 publications

(2 citation statements)

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“…In the regional gravity picture, this NW-SE trend is found to extend further north and abuts against the Delhi-Aravalli system. When extended southwards, the trend joins with the Gondwana Godavari graben (Atchuta Rao et al, 1992) implying that the NW-SE trending Permian-Jurassic Gondwana rift valley runs from central India to the east coast, till the ocean continent boundary (Rajaram et al, 2000).…”

Section: Discussionmentioning

confidence: 99%

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Anand

Rajaram

2014

Earth Planet Sp

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Aeromagnetic data analysis over the Narmada-Son Lineament (NSL) shows that prominent anomalies are located over dyke swarms and trap flows and the major formations present have distinct magnetic signatures. A major extensive ENE fault is identified which coincides with the course of the Narmada river and which appears, as earlier suggested, to control Gondwana sedimentation to the south and Vindhyan sedimentation to the north. By isolating the sources, it is found that the signatures of the Deccan traps have a distribution that is possibly related to their time of eruption and subsequent evolution. The region between Hoshangabad (HBD) and Narsimapura (NSR) are made up of two structural units: a shallow ENE structure superposed on a deeper NW-SE feature which is possibly related to the continuation of the Godavari Gondwana Graben towards the northwest. The region north and south of the deep-seated fault F1 has undergone different evolutionary history. The thickness of the magnetic crust in the Narmada-Son region lies between 25 to 31 km, implying a lithological change below this depth. This is borne out by the high velocity layer (7.2 km/s) within the lower crust identified by DSS studies.

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Section: Discussionmentioning

confidence: 99%

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Anand

Rajaram

2014

Earth Planet Sp

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“…This area is mostly covered by thick alluvium and outcrops are sparse with a few exposures of the Mahakoshal Supergroup (Figure 2b). The aeromagnetic survey picked up a glaring anomaly in the central block located towards the south of Gadarwara town (22.552 • N, 78.472 • E) [31,37]. The magnitude of the anomaly is about a 600 nT, above background values and covers an area of approximately 40 km 2 .…”

Section: The Gadarwara Magnetic Anomalymentioning

confidence: 99%

Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny

Raju

Kumar

2020

Minerals

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A government airborne geophysical survey flown in the late 1970s detected a large Magnetic anomaly at Gadarwara, Madhya Pradesh, in north-central India. Deep drilling indicates that the oval-shaped Magnetic anomaly is caused by underlying Magnetite-bearing banded iron formation belonging to the Mahakoshal Formation of Archean to Early Proterozoic age. The anomaly is hosted in a tectonic rift zone (Narmada-Son Lineament). After drilling alluvium up to 312 m thick, rocks intersected to depths of 612 m provided core samples for research. Broadly speaking, the samples contain banded hematite jaspilite (BHJ) and banded Magnetite (BM) iron formation with pervasive carbonate alterations. Three vertical diamond drill holes were drilled along a 1.4 km long N-S transect across the center of the geophysical anomaly. DDH-1, near the northern edge of the anomaly, went through 309 m of alluvium before intersecting bedrock and then cored 303 m of bedrock for a total depth of 612 m. Copper mineralization with appreciable amounts of cobalt, zinc, molybdenum, silver, rare earth elements, uranium and other elements was intersected. The litho-units are highly oxidised and intensely brecciated with hydrothermal overprinting of Na-K metasomatism alteration mineralogy. The second borehole, DDH-2 failed as the core drilling bit stuck in the alluvium and further drilling was abandoned, whereas the third borehole DDH-3 didnot intersect a Magnetite-hematite association and cored only siltstone. Two-dimensional model studies suggest that the signature of high Magnetic anomaly is at a depth of 0.4 km from the surface, with a width of 3.5 km, dipping at 45∘ in a northerly direction. The causative body has a Magnetic susceptibility of 0.0052 C.G.S. units, suggestive of a hematite with quartz veinlets lithology. Based on predictive Magnetic exploration models for Iron-Oxide-Copper-Gold (IOCG), such deposits can be inferred from geological observations combined with petrophysical data and forward modelling of the observed Magnetic signatures. This paper reports a prospective IOCG-like mineralization style hosted in a rift (Narmada-Son) type of tectonic environment.

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Continental Lithosphere

Dessai

2020

Modern Approaches in Solid Earth Sciences

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Crustal structure associated with Gondwana graben across the Narmada-Son lineament in India: An inference from aeromagnetics

Cited by 11 publications

References 11 publications

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Crustal structure of Narmada-Son Lineament: An aeromagnetic perspective

Magnetic Survey for Iron-Oxide-Copper-Gold (IOCG) and Alkali Calcic Alteration Signatures in Gadarwara, M.P, India: Implications on Copper Metallogeny

Continental Lithosphere

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