Source and Differentiation of Deccan Trap Lavas: Implications of Geochemical and Mineral Chemical Variations

Lightfoot, Peter C.; Hawkesworth, Chris J.; Devey, Colin W.; Rogers, Nick; Calsteren, P. W. C. van

doi:10.1093/petrology/31.5.1165

Cited by 208 publications

(104 citation statements)

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“…patterns are flatter than those of the Poladpur from Sr to Lu, and have much larger Pb peaks and more pronounced Nb -Ta and Ti troughs, in particular (e.g. Lightfoot et al, 1990;Mahoney et al, 2000). Bijasan Ghat flow SH32 has Bushe-type characteristics, the closest Bushe Fm.…”

Section: Comparison Of Multielement Patternsmentioning

confidence: 92%

“…Cox and Hawkesworth, 1985;Devey and Lightfoot, 1986). Lightfoot et al (1990) proposed that Ba contents can be used to distinguish between Ambenali and Poladpur lavas, with the Ambenali generally having , 100 ppm Ba and the Poladpur generally . 100 ppm Ba.…”

Section: Binary Chemical Diagramsmentioning

confidence: 99%

“…1) in the Western Ghats range, and the stratigraphic framework of this region is now known quite well from extensive field, geochemical (including isotopic) and palaeomagnetic work (e.g. Cox and Hawkesworth, 1985;Beane et al, 1986;Subbarao, 1988;Lightfoot et al, 1990;Peng et al, 1994). On the basis of geochemical characteristics and field markers, the Western Ghats sequence, with a total stratigraphic thickness of , 3,000 m, has been divided into three subgroups and eleven formations (Table 1).…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Geochemical stratigraphy of Deccan flood basalts of the Bijasan Ghat section, Satpura Range, India

Sheth¹,

Mahoney²,

Chandrasekharam³

2004

Journal of Asian Earth Sciences

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Section: Comparison Of Multielement Patternsmentioning

confidence: 92%

Section: Binary Chemical Diagramsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Geochemical stratigraphy of Deccan flood basalts of the Bijasan Ghat section, Satpura Range, India

Sheth¹,

Mahoney²,

Chandrasekharam³

2004

Journal of Asian Earth Sciences

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“…1) in the Western Ghats (Sahayadri) range, and the stratigraphic framework of this region is now known quite well from extensive field, geochemical (including isotopic) and palaeomagnetic work (e.g., see Mahoney, 1988 and references therein;Subbarao, 1988 and references therein;Lightfoot et al, 1990;Peng et al, 1994). The Western Ghats sequence is almost exclusively tholeiitic (subalkalic) (Fig.…”

Section: The Deccan Tholeiites and Picritesmentioning

confidence: 99%

Were the Deccan Flood Basalts Derived in Part from Ancient Oceanic Crust Within the Indian Continental Lithosphere?

Sheth¹

2005

Gondwana Research

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Deep mantle plumes supposedly incorporate deeply subducted eclogitized oceanic crust, and continental flood basalts (CFBs) are now thought by some to be derived from such eclogite-bearing peridotite plumes. Eclogite-peridotite mixtures have much lower solidi (and produce much greater melt fractions for a given temperature) than peridotite. Ferich (eclogite-or pyroxenite-bearing) sources have been inferred for many CFBs. However, plumes with considerable amounts of eclogite should have difficulty in upwelling owing to the high density of eclogite. Besides, CFBs are always located along pre-existing lithospheric structures (suture zones, edges of thick cratons) and commonly associated with lithospheric rifting and continental breakup. India's major late Mesozoic CFB, the Deccan Traps, erupted through rift zones and a new continental margin that had developed along ancient suture zones traversing the subcontinent. Many Deccan basalts are too Fe-rich to have been in equilibrium with a peridotite mantle source, and have commonly been considered to be significantly fractionated derivatives of picritic liquids. However, it is possible to view them as relatively less evolved liquids derived from a source with extra fertility (i.e., an Fe-rich source). A new non-plume, plate tectonic model for Icelandic hotspot volcanism involves melting of a shallowly recycled slab of eclogitized Iapetus oceanic crust formerly trapped along the Caledonian suture. The model explains the geochemical-petrological characteristics of Icelandic basalts, and is consistent with passive upper mantle upwelling under Iceland inferred from recent seismic tomography. Based on the petrological and geochemical features of the Deccan flood basalts of the type section, in the Western Ghats, I propose that old, eclogitized oceanic crust trapped in the ancient Indian suture zones could have produced voluminous basaltic melts during the Deccan event.

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“…The plot of Ba/Y ratio against Zr/Nb ratio for all the Jabalpur samples ( wt% -2.34 wt%, Ba = 199 ppm -175 ppm, Sr = 317 ppm -283 ppm for the Jabalpur GPBs and the Maha-baleshwar lavas respectively. Mahabaleshwar values are from Lightfoot et al, [26]). However, compared to the Mahabaleshwar lavas, these GPBs are chemically more evolved with lower Mg#s, and MgO, Ni and Cr abundances, and higher concentrations of LILE (Sr, Ba) and HFSE (Nb, Zr).…”

Section: Discussionmentioning

confidence: 99%

Giant Plagioclase Basalts from Northeastern Deccan Volcanic Province, India: Implications for Their Origin and Petrogenetic Significance

Talusani¹

2012

IJG

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The giant plagioclase basalts (GPBs) with plagioclase phenocrysts that reach up to 3 cm in length are found near Jabalpur in the northeastern part of the Deccan Volcanic Province (DVP). The thickness of the basalt flow (flow 6) that contains the GPBs is ~ 20 m. Plagioclase phenocysts (An 58 -An 64 ) in the GPBs display many features of magma mixing (e.g., resorption, reverse zoning). Of the nine flows in the Jabalpur section, the GPBs (flow 6) with lowest Mg#s (38 -43) and MgO (4.16 -5.08 wt%), Ni and Cr abundances are the most evolved compositions. In addition, these GPBs have highest abundances of incompatible elements (TiO 2 , P 2 O 5 , Nb, Zr, Sr and Ba). The GPBs are compositionally similar to the well-studied Mahabaleshwar lavas of the western DVP. This new occurrence of GPBs has implications for existence of local crustal magma chambers, feeders and vents in the northeastern part of the DVP.

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Source and Differentiation of Deccan Trap Lavas: Implications of Geochemical and Mineral Chemical Variations

Cited by 208 publications

References 0 publications

Geochemical stratigraphy of Deccan flood basalts of the Bijasan Ghat section, Satpura Range, India

Geochemical stratigraphy of Deccan flood basalts of the Bijasan Ghat section, Satpura Range, India

Were the Deccan Flood Basalts Derived in Part from Ancient Oceanic Crust Within the Indian Continental Lithosphere?

Giant Plagioclase Basalts from Northeastern Deccan Volcanic Province, India: Implications for Their Origin and Petrogenetic Significance

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