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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Africa
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Central Africa
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Burundi (1)
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Rwanda (1)
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East Africa
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Afar Depression (1)
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Ethiopia (1)
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Tanzania (1)
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Madagascar (2)
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North Africa
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Southern Africa
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Namibia (1)
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South Africa
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Zimbabwe
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Asia
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Far East
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Himalayas (2)
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India
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Ghats
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Gujarat India
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Mesozoic
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upper Maestrichtian (2)
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Paleozoic
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sheet silicates
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sulfates
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Primary terms
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absolute age (17)
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Africa
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East Africa
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Southern Africa
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Far East
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Ghats
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Western Ghats (10)
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Gujarat India
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Kutch India
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Saurashtra (9)
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Latur India (1)
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Lonar Crater (2)
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Narmada Valley (3)
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Northeastern India
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Rajasthan India
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Deccan Traps
Two syenitic phases in the Early Paleogene Silhouette Island volcano-plutonic complex, Seychelles
Palynology of the uppermost Cretaceous to lowermost Paleocene Deccan volcanic associated sediments of the Mandla Lobe, central India
The physical volcanology of large-scale effusive and explosive silicic eruptions in southeastern Saurashtra, Deccan Traps
Acheulian artefacts and tephra from Upland Western Maharashtra (Deccan Volcanic Province), Peninsular India
Abstract The two Early Acheulian sites of Bori and Morgaon in the Deccan Volcanic Province in Upland Maharashtra, India bear some association with an acidic tephra deposit in a fluvial context. Acheulian artefacts in association with tephra were first reported in India from the Bori site and numerous efforts to date this tephra have since been undertaken. These efforts employed various dating methods and produced a total of 10 absolute dates ranging from the Early Pleistocene with a maximum age of 1.4 Ma to the Late Pleistocene with a minimum age of 23.4 ± 2.4 ka. However, field observations and a typo-technological analysis strongly suggests that these Early Acheulian artefacts occur in a semi-primary context, and thus contest the Late Pleistocene age of the tephra and redeposition of the artefacts as argued by some scholars. At Morgaon, the Acheulian artefacts have been recovered from basal fluvial sediments that contain clasts of laterite. These sediments are capped by two low-energy clay facies that are separated by high-energy gravel lenses. The tephra at Morgaon has been reported from the upper clay facies and has produced absolute dates ranging from the Matuyama period (>0.78 Ma) to the Late Pleistocene (41 ka). After more than two decades of investigation at these sites, the number of absolute dates procured through methods such as electron spin resonance (ESR), 39 Ar– 40 Ar, U–Th and palaeomagnetism, although encouraging, are inconclusive. This paper is therefore an attempt to gauge the nature of the palaeolandscapes that most probably existed during the Early Quaternary. This will be achieved by studying local geomorphological variability between the two sites, along with a preliminary analysis of lithic morphology.
Spatial distribution of Palaeolithic sites in relation to raw material sources in the central Narmada Valley, India
Abstract Landscape adaptation in central India is quite exceptional, as more than 300 Lower Palaeolithic occurrences have been reported in different contexts. The present work deals with these assemblages and associated raw material sources in the central Narmada Valley. The central Narmada Valley is rich in various rock types that were used as raw material by various hominin populations. The Narmada River divides the region into northern and southern parts. In the north, there are mainly the Vindhyan Supergroup and Deccan Trap, whereas, in the south, there are primarily the Gondwana Supergroup, the Deccan Traps and the Mahakoshal Group. Along the river, there are exposures of the Vindhyan Supergroup and thick deposits of Quaternary alluvium. The main raw material types in the north of Narmada are quartzite and sandstone (Vindhyan Supergroup), whereas, in the south of Narmada, the main raw materials are quartzite (Gondwana Supergroup) and chert (Deccan Trap). Acheulean sites are mostly found along the foothills of Vindhyan, as well as along the banks of the Narmada River and its tributaries. In this chapter, the author has tried to link these raw material sources with the occurrences of Palaeolithic sites in order to have a better understanding of past hominin land-use patterns and ecological adaptations.
Well Hydraulics in Parts of Western Vidarbha Region in Deccan Traps, India
Processing of Multispectral ASTER Data to Delineate Bauxite Abundant Zones and its Geochemical Characterisation Deposited over Deccan Traps of Central India in Mainpat Plateau, Surguja District, Chhattisgarh
Mercury evidence of Deccan volcanism driving the Latest Maastrichtian warming event
Deccan volcanism at K-Pg time
ABSTRACT The last major mass extinctions in Earth history (e.g., end-Guadalupian, end-Permian, end-Triassic, and end-Cretaceous) are all correlated closely in time with the main-phase eruptions of major flood basalt provinces (Emeishan, Siberian, Central Atlantic Magmatic Province, and Deccan Traps, respectively). The causal relationship between flood volcanism and mass extinction is not clear, but likely involves the climate effects of outgassed volatile species such as CO 2 , SO 2 , Cl, F, etc., from some combination of magma and country rocks. In a surprising “coincidence,” the end-Cretaceous (K-Pg boundary) micro-faunal extinction also corresponds precisely in time to what may have been the largest meteor impact of the past billion years of Earth history, the Chicxulub crater at 66.05 Ma. The Deccan Traps eruptions were under way well before K-Pg/Chicxulub time and are most likely the result of the mantle plume “head” that initiated the presently active Reunion hotspot track—thus the Deccan Traps were clearly not generated, fundamentally, by the impact. However, recent high-precision 40 Ar/ 39 Ar geochronology indicates that conspicuous changes in basalt geochemistry, lava flow morphology, emplacement mode, and a possible 50% increase in eruption rate at the Lonavala/Wai subgroup transition in the Deccan Traps lava group corresponded, within radioisotopic age precision, to the K-Pg boundary and the Chicxulub impact. This has led to the testable hypothesis that the M w ~11 seismic disturbance of the Chicxulub impact may have affected the Deccan eruptions. Here we review a broad landscape of evidence regarding Deccan volcanism and its relation to the K-Pg boundary and attempt to define what we see as the most important questions than can and should be answered by further research to better understand both the onshore and largely unknown offshore components of Deccan-related volcanism, and what their climate and environmental impacts at K-Pg time may have been.