<sup>40</sup>Ar‐<sup>39</sup>Ar ages of Bombay trachytes: Evidence for a Palaeocene phase of Deccan volcanism

Sheth, Hetu; Pande, Kanchan; Bhutani, Rajneesh

doi:10.1029/2001gl012921

Cited by 81 publications

(41 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although we (together with [38,53,77,78]) would argue that many older and younger ages are based on lower quality, disturbed spectra as well as whole rock samples that may have been affected by alteration and recoil, the important question is to reconstruct the flux (or volume) history of volcanism. For instance, Sheth et al [163] find an age between 60 and 62 Ma on trachyte dykes (not flows) from near the coast and flexure marking the edge of continental breakup between India and the Seychelles. It is not surprising that a tail (and more) of volcanism should mark the later breakup phase following trap emplacement [34,35,37], as has been seen to be the case with much larger volumes for the Ethiopian and Brito-Arctic traps.…”

Section: The Deccan Trapsmentioning

confidence: 99%

On the ages of flood basalt events

Courtillot

Renne

2003

Comptes Rendus. Géoscience

726

400

View full text Add to dashboard Cite

We review available data constraining the extent, volume, age and duration of all major Phanerozoic continental flood basalts (CFB or traps) and oceanic plateaus (OP), together forming the group of large igneous provinces (LIP), going from the smallest Columbia flood basalts at ∼16 Ma to the as yet ill-known remnants of a possible trap at ∼360 Ma in eastern Siberia. The 16 traps (CFB and OP) reviewed form a rather unimodal distribution with an initial modal volume of the order of 2.5 Mkm 3 . Most provinces agree with a rather simple first order model in which volcanism may have lasted of the order of 10 Ma, often resulting in continental break-up, but where most of the volume was erupted in about 1 Ma or sometimes less. This makes CFBs/OPs (LIPs) major geodynamic events, with fluxes exceeding the total output of present day hot spots and even possibly exceeding over short times the entire crustal production of mid-ocean ridges. The proposed correlation between trap ages and the ages of several geological events, including mass extinctions and oceanic anoxia, is found to have improved steadily as more data have become available, to the point that the list of trap ages may coincide with many major divisions in the geological time scale. The four largest mass extinctions in the last 260 Ma coincide to the best resolution available with four traps, making a causal connection between the two through some form of catastrophic climatic perturbations the most likely hypothesis. The time sequence of LIPs appears to have been random and there is no robust evidence for long time trends in the corresponding crustal production rate over the last 260 Ma.  2003 Académie des sciences/Éditions scientifiques et médicales Elsevier SAS. All rights reserved. RésuméNous passons en revue l'ensemble des données qui permettent de contraindre l'étendue, le volume, l'âge et la durée de toutes les grandes provinces magmatiques basaltiques (en anglais LIP) d'âge Phanérozoïque, qu'il s'agisse des trapps ou plateaux basaltiques continentaux (en anglais CFB) ou des plateaux océaniques (OP), allant de la plus récente et plus petite (le plateau de Columbia âgé de ∼16 Ma) à l'une des plus anciennes, encore mal connue, située dans l'Est de la Sibérie et sans doute âgée de ∼360 Ma. Les 16 provinces passées en revue forment une distribution assez unimodale, avec des volumes initiaux de lave de l'ordre de 2,5 Mkm 3 . La plupart des provinces sont compatibles, au premier ordre, avec un modèle simple selon lequel le volcanisme a pu durer une dizaine de millions d'années et a en général conduit à une déchirure des continents et à l'ouverture d'un nouveau bassin océanique, mais où l'essentiel du volume des laves a été émis en environ 1 million d'années, parfois moins. Ceci fait des trapps (des LIP en général) des événements géodynamiques majeurs, avec des flux de matière ayant dépassé la production totale actuelle des points chauds et même, peut-être, pendant de brefs intervalles, la totalité de la production de croûte V.E. Courtillot, P.R. Renn...

show abstract

Section: The Deccan Trapsmentioning

confidence: 99%

On the ages of flood basalt events

Courtillot

Renne

2003

Comptes Rendus. Géoscience

726

400

View full text Add to dashboard Cite

show abstract

“…The geological formations found in Mumbai include the Deccan Basalts and its acid variants, volcanic tuffs, intertrappean sediments, dykes, laterite and alluvium. The geology of Mumbai Island is rather unusual compared to that of the main Deccan flood basalt province, particularly the Western Ghats in several aspects (Sukeshwala and Poldervaart 1958;Sethna 1981Sethna , 1999Sheth et al 2001). Important differences include.…”

Section: Geological Setupmentioning

confidence: 99%

Geomorphology and its implication in urban groundwater environment: case study from Mumbai, India

et al. 2014

View full text Add to dashboard Cite

Landforms of Mumbai Island have been largely modified by the urban sprawl and the demand for groundwater will increase exponentially in the future. Quality and quantity of groundwater occurrence in island are highly influenced by the geomorphic units. As this metropolis receives heavy rainfall, the area rarely faces the issue of water scarcity, nevertheless, quality always remains a question. The landforms of Mumbai Island have been shaped by a combination of fluvial, denudational and marine processes. These landforms are categorized into two broad zones on the basis of its influence in groundwater occurrence. Denudational landforms are categorized as runoff zones whereas the other two are categorized as storage zones. This classification is on the basis of occurrence and storage of groundwater. Mumbai Island is exposed to frequent sea water incursion and groundwater quality has deteriorated. The varied hydrogeological conditions prevalent in this area prevent rapid infiltration. This combined with the overextraction of groundwater resources for agriculture and industry has caused serious concern about the continued availability of potable water. This study aims at validating the geomorphic classification of the landforms with hydrogeochemistry and borehole data and it proved that geomorphology corroborates with groundwater chemistry and subsurface geology.

show abstract

“…The volcanic rocks are dominated by subaerial flows of tholeiitic basalts with minor occurrences of picrites and alkali basalts (e.g., Beane et al 1986). The flood basalts were erupted close to the CretaceousTertiary boundary (61-72 Ma; Lightfoot et al 1987;Vandamme et al 1991;Sheth et al 2001;Mahoney et al 2002;Pande 2002).…”

Section: Regional Geology and Field Settingmentioning

confidence: 99%

“…120 Ma (e.g., Katz and Premoli 1979;Collins and Windley 2002;Meert 2003;O'Neill et al 2003;Ishwar Kumar et al 2013) just before their rifting juxtaposes the Antongil Block of Madagascar against the late Cretaceous to Paleocene (Lightfoot et al 1987;Vandamme et al 1991;Sheth et al 2001;Mahoney et al 2002;Pande 2002) Deccan Traps of India ( fig. 1).…”

Section: Introductionmentioning

confidence: 99%

The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

Upadhyay

Kooijman

Singh

et al. 2015

The Journal of Geology

View full text Add to dashboard Cite

JSTOR is a not-for-profit service that helps scholars, researchers, and students discover, use, and build upon a wide range of content in a trusted digital archive. We use information technology and tools to increase productivity and facilitate new forms of scholarship. For more information about JSTOR, please contact support@jstor.org.. The University of Chicago Press is collaborating with JSTOR to digitize, preserve and extend access to The Journal of Geology.

show abstract

⁴⁰Ar‐³⁹Ar ages of Bombay trachytes: Evidence for a Palaeocene phase of Deccan volcanism

Cited by 81 publications

References 18 publications

On the ages of flood basalt events

On the ages of flood basalt events

Geomorphology and its implication in urban groundwater environment: case study from Mumbai, India

The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

Contact Info

Product

Resources

About

40Ar‐39Ar ages of Bombay trachytes: Evidence for a Palaeocene phase of Deccan volcanism

Cited by 81 publications

References 18 publications

On the ages of flood basalt events

On the ages of flood basalt events

Geomorphology and its implication in urban groundwater environment: case study from Mumbai, India

The Basement of the Deccan Traps and Its Madagascar Connection: Constraints from Xenoliths

Contact Info

Product

Resources

About

⁴⁰Ar‐³⁹Ar ages of Bombay trachytes: Evidence for a Palaeocene phase of Deccan volcanism