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GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Madagascar (1)
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Asia
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Indian Peninsula
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Godavari River (1)
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India
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Gujarat India
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Karnataka India (2)
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Commonwealth of Independent States
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oxygen
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fossils
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Invertebrata
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palynomorphs
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Primary terms
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Africa
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Ghats
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Western Ghats (29)
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Gujarat India
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Kutch India (1)
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Saurashtra (1)
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Karnataka India (2)
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Kerala India
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Trivandrum India (1)
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Krishna River (1)
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Madhya Pradesh India (1)
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Koyna Dam (2)
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Koyna River (1)
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Narmada-Son Lineament (1)
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Rajasthan India (1)
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Satpura Range (1)
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Krasnoyarsk Russian Federation
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lower Paleocene
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K-T boundary (4)
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Chordata
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Vertebrata
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Reptilia
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igneous rocks
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volcanic rocks
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flood basalts (6)
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mid-ocean ridge basalts (1)
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ocean-island basalts (1)
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Indian Ocean Islands
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Madagascar (1)
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intrusions (1)
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Invertebrata
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Arthropoda
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Mandibulata
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Insecta
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Pterygota
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Neoptera
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Endopterygota
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Hymenoptera (1)
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-
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-
-
-
-
isotopes
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radioactive isotopes
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Pb-206/Pb-204 (1)
-
-
stable isotopes
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Nd-144/Nd-143 (1)
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O-18/O-16 (1)
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Sr-87/Sr-86 (2)
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metal ores
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rock formations
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Siberian Traps (1)
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soils
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soils
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Western Ghats
Honey-producing bee–pollen–vegetation relationships in the West Coast and Western Ghats of India
A red bole zircon record of cryptic silicic volcanism in the Deccan Traps, India
The interrelationship between electrical resistivity and V P / V S ratio: A novel approach to constrain the subsurface resistivity structure in data gap areas in a seismogenic zone
Crustal Density and Susceptibility Structure beneath Achankovil Shear Zone, India
Report on the Webinar No. 25 on ‘Ramnadi Restoration Mission’ , 29 th November, 2020, Pune
Koyna-Warna Shallow Seismic Region, India: Is there Any Geomorphic Expression of Active Tectonics?
The Deccan Volcanic Province (DVP), India: A Review: Part 2: Geochemistry, petrological evolution, petrogenesis, mantle sources, age and erupted volume relations, Upper Cretaceous-Palaeogene (K-Pg) mass extinctions, economic aspects, summary and future studies in DVP
ABSTRACT We conducted a detailed rock magnetic and mineralogical study of bole beds from the Deccan magmatic province, India. Magnetic susceptibility of 15 bole beds showed two contrasting patterns, with susceptibility values either increasing or decreasing up the profile. We then focused on two representatives red boles located in the Western Ghats, the RBB and RBAN profiles, to unravel the nature and origin of these contrasting magnetic susceptibility patterns. The presence of smectite argues against significant secondary thermal alterations. Major-elemental compositions obtained by X-ray fluorescence spectrometry of RBB and RBAN red boles are comparable to the parent basalt and show significant and typical depletion of mobile elements such as sodium and calcium compared to the parent basalt. The Ti/Al ratio of both the red boles and their overlying clay layers is close to the typical value of Deccan basalt (0.2), suggesting that the material of the red boles has been derived from weathering of the parent basalt. The chemical index of alteration varies from 40–50 in the parent basalt to 80–90 at the top of the bole beds, consistent with moderate to intense weathering of the bole beds. However, similar to other Deccan bole beds, indices of lateritization below 50 suggest that the state of lateritization has not been reached. Although the RBB and RBAN profiles share similar mineralogical signatures, their magnetic mineral assemblages are distinctly different. In the RBB profile, magnetic susceptibility decreases up-profile as a result of oxidation/dissolution of primary titanomagnetite inherited from the parent basalt, with subsequent formation of pedogenic hematite and superparamagnetic particles. In contrast, magnetic susceptibility in the RBAN profile, which contains magnetite, some hematite, and goethite, increases up-profile. The increase in the magnetic signal is mainly due to the increasing amounts of phyllosilicate and goethite, while the content of magnetite and hematite remains constant along the profile. We attribute the variation in the magnetic mineral assemblage to contrasting humid and dry environments during weathering, leading to the preferential formation of goethite or hematite, respectively. The combined mineralogical and rock magnetic data suggest the existence of a single weathering profile involving soil formation in the two studied red boles, with few or no contributions from an external source.