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Mahabaleshwar Formation

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Image
Diagram showing the difference in thickness of lava between the base of the...
Published: 01 January 2009
Fig. 6. Diagram showing the difference in thickness of lava between the base of the Mahabaleshwar Formation and the 29r–29n palaeomagnetic reversal horizon. Also shown is the elevation of the base of the Mahabaleshwar Formation from Cox & Hawkesworth (1985 ) and Devey (1986 ), derived from
Image
Comparison of the five sections where the palaeomagnetic reversal (29r–29n)...
Published: 01 January 2009
Fig. 4. Comparison of the five sections where the palaeomagnetic reversal (29r–29n) has been observed, showing the sampling locations (•). The stratigraphic columns have been aligned along the reversal boundary, and the geochemical boundary between the Ambenali and Mahabaleshwar Formations
Image
(A) (i) Deccan subgroups and <span class="search-highlight">formations</span> ( Chenet et al., 2008 ). Additional...
Published: 01 November 2015
footprint area of the Deccan Traps ( Self et al., 2006 ). (iii) Volumes based on the assumption that the Poladpur, Ambenali, and Mahabaleshwar Formations cover circular footprint areas with radius 600 km, and that all the other formations have circular footprint areas with radius 250 km, as suggested
Image
(A) (i) Deccan subgroups and <span class="search-highlight">formations</span> ( Chenet et al., 2008 ). Additional...
Published: 01 November 2015
footprint area of the Deccan Traps ( Self et al., 2006 ). (iii) Volumes based on the assumption that the Poladpur, Ambenali, and Mahabaleshwar Formations cover circular footprint areas with radius 600 km, and that all the other formations have circular footprint areas with radius 250 km, as suggested
Journal Article
Published: 01 January 2009
Journal of the Geological Society (2009) 166 (1): 13–24.
...Fig. 6. Diagram showing the difference in thickness of lava between the base of the Mahabaleshwar Formation and the 29r–29n palaeomagnetic reversal horizon. Also shown is the elevation of the base of the Mahabaleshwar Formation from Cox & Hawkesworth (1985 ) and Devey (1986 ), derived from...
FIGURES | View All (7)
Journal Article
Journal: GSA Bulletin
Published: 01 November 2015
GSA Bulletin (2015) 127 (11-12): 1507–1520.
... footprint area of the Deccan Traps ( Self et al., 2006 ). (iii) Volumes based on the assumption that the Poladpur, Ambenali, and Mahabaleshwar Formations cover circular footprint areas with radius 600 km, and that all the other formations have circular footprint areas with radius 250 km, as suggested...
FIGURES | View All (11)
Journal Article
Published: 01 June 1991
Journal of the Geological Society (1991) 148 (3): 495–505.
... crystallization are typically manifest as shifts in the ranges of incompatible element abundances, and for instance, the ranges of Ba concentration within the Ambenali (50-100ppm) and Mahabaleshwar Formations (100-200 ppm) can be readily ascribed to 50% fractionation of a gabbroic assemblage (e.g. Cox & Devey...
Journal Article
Published: 01 June 1992
Journal of the Geological Society (1992) 149 (3): 473–478.
... on the basis of regional dips) is revised in light of all the above points, could not the samples interpreted as transitional flows between the Ambenali/Poladpur/Mahabaleshwar Formations by Mitchell & Widdowson (their figs 6 & 7 ) be open to alternative interpre- tations? What is the position adopted...
Journal Article
Journal: Geology
Published: 05 January 2022
Geology (2022) 50 (4): 460–464.
...] model composition in parts per 10,000). The analysis included euhedral crystals isolated from (1) red boles, (2) an ~40-cm-thick tephra in the Mahabaleshwar Formation (samples DEC13–08/09/10), and (3) a single coarse-grained segregation within a basaltic flow in the Jawhar Formation (DEC13–30); we...
FIGURES | View All (4)
Journal Article
Published: 01 January 2008
Journal of the Geological Society (2008) 165 (1): 177–188.
.... There are 11 widely recognized formations; the Desur Fm is restricted to a few flows in the southern Deccan only (i.e. Belgaum area), and considered to be essentially a return to Mahabaleshwar-type eruptions (e.g. Lightfoot & Hawkesworth 1988 ; Lightfoot et al . 1990 ). The total basalt thickness is c...
FIGURES | View All (7)
Image
Geochemical comparison for samples from the SE corner of the Deccan Volcani...
Published: 01 January 2008
Fig. 4.  Geochemical comparison for samples from the SE corner of the Deccan Volcanic Province (black symbols), the Killari borehole (open symbols) and the Rajahmundry Traps (dark grey diamonds, Baksi 2001 ; light grey diamonds, Cripps 2002 ). Triangles, Mahabaleshwar Fm; circles, Ambenali Fm
Image
Composite stratigraphic column showing the geochemical <span class="search-highlight">formations</span> of the Ma...
Published: 01 January 2008
Fig. 2.  Composite stratigraphic column showing the geochemical formations of the Main Deccan Volcanic Province, demonstrating their maximum cumulative thickness. There are 11 widely recognized formations; the Desur Fm is restricted to a few flows in the southern Deccan only (i.e. Belgaum area
Journal Article
Published: 01 December 1991
Journal of the Geological Society (1991) 148 (6): 979–983.
... Cox K. G. Hawkesworth C. J. Relative contributions of crust and mantle to flood basalt volcanism, Mahabaleshwar area, Deccan Traps Philosophical Transactions of the Royal Society of London 1984 A310 627 641 Cox K. G. Hawkesworth C. J. Geochemical stratigraphy of the Deccan...
Journal Article
Published: 09 March 2016
Journal of the Geological Society (2016) 173 (4): 679–688.
... eruption history has been recently confirmed by Schoene et al. (2015) , who obtained U/Pb ages on single zircon (2–8 data per sample) ranging from 66.29 ± 0.03 Ma (lowest lava flow unit, Jawhar formation) to 65.53 ± 0.03 Ma (topmost lava flow unit, Mahabaleshwar formation). New 40 Ar/ 39 Ar ages...
FIGURES | View All (4)
Journal Article
Journal: GSA Bulletin
Published: 18 June 2019
GSA Bulletin (2020) 132 (3-4): 588–607.
... ( Mitchell and Widdowson, 1991 ; Jay and Widdowson, 2008 ; Sheth et al., 2014 ). These transitions have overlapping ranges ( Fig. 2 ) and appear to transcend the polarity reversal recorded in the lower lavas of the Mahabaleshwar Formation ( Renne et al., 2015 ). These and similar examples show...
FIGURES | View All (9)
Journal Article
Journal: Geology
Published: 01 September 2010
Geology (2010) 38 (9): 839–842.
... succession ( Beane et al., 1986 ). Thirty dikes and minor intrusive bodies were mapped, sampled, and analyzed from the coastal section immediately south of Mumbai (Table DR3). These fall into three groups: Twelve dikes have Wai Subgroup (Mahabaleshwar, Ambenali, and Poladpur Formations...
FIGURES
Journal Article
Journal: Geology
Published: 01 October 2014
Geology (2014) 42 (10): 895–898.
.... Plotted also are the sulfur concentrations (uncertainty is ±10%) measured by Self et al. (2008) in four Deccan Traps basalts of the Neral, Thakurvadi, and Jawar Formations (India; data averaged for 1–7 melt inclusion [MI] analyses per rock) and those measured by Marks et al. (2014) on olivine-hosted...
FIGURES | View All (4)
Journal Article
Published: 01 February 1975
Bulletin of the Seismological Society of America (1975) 65 (1): 183–191.
... (Sahyadri Mountains) which act as a watershed between the narrow coastal strip of Konkan and the eastern mainland area (Figure 1). The country rocks in the project area are basaltic lava flows belonging to the Deccan Trap formation of Paleocene age. Although the area forms a part of the aseismic penin...
Image
The Poladpur-Bushe contact as seen in the field (A) and in satellite images...
Published: 01 November 2015
believed to be Poladpur Formation. (B–D) Satellite images of Western Ghats (Sahyadri) escarpment from the regions west of Pune and Mahabaleshwar, showing the prominent topographic terrace at contact between Bushe and Poladpur Formations (and between Lonavala and Wai Subgroups), and showing that formations
Image
The Poladpur-Bushe contact as seen in the field (A) and in satellite images...
Published: 01 November 2015
believed to be Poladpur Formation. (B–D) Satellite images of Western Ghats (Sahyadri) escarpment from the regions west of Pune and Mahabaleshwar, showing the prominent topographic terrace at contact between Bushe and Poladpur Formations (and between Lonavala and Wai Subgroups), and showing that formations