Maastrichtian Palynoflora from Deccan Volcanic Associated Sediments of Mahurzari, Nagpur District, Maharashtra: Age and Paleoenvironment with Comments on Megaflora

Samant, Bandana; Kapgate, Dashrath K.; Kumar, Deepesh; Mohabey, D. M.; Dhoble, Anup

doi:10.1007/s12594-020-1464-6

Cited by 12 publications

(3 citation statements)

References 15 publications

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“…The early Maastrichtian Indian sediments are characterized by gymnosperm-dominated pollen floras ( 31 ), with the widespread occurrence of calcrete lithologies suggesting a strongly water-deficient climate ( 32 ) unsuitable for the tropical angiosperm flora to flourish. We suggest that the presence of a surprising diversity of modern tropical plant families’ fossils in the form of woods, leaves, fruits, and pollen in the Late Maastrichtian Intertrappean sediments may reflect their dispersal from Africa via the KLIA along with members of Dipterocarpaceae.…”

mentioning

confidence: 99%

Southeast Asian Dipterocarp origin and diversification driven by Africa-India floristic interchange

Bansal¹,

Morley

Nagaraju³

et al. 2022

Science

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The evolution and diversification of ancient megathermal angiosperm lineages with Africa-India origins in Asian tropical forests is poorly understood because of the lack of reliable fossils. Our palaeobiogeographical analysis of pollen fossils from Africa and India combined with molecular data and fossil amber records suggest a tropical-African origin of Dipterocarpaceae during the mid-Cretaceous and its dispersal to India during the Late Maastrichtian and Paleocene, leading to range expansion of aseasonal dipterocarps on the Indian Plate. The India-Asia collision further facilitated the dispersal of dipterocarps from India to similar climatic zones in Southeast Asia, which supports their out-of-India migration. The dispersal pathway suggested for Dipterocarpaceae may provide a framework for an alternative biogeographic hypothesis for several megathermal angiosperm families that are presently widely distributed in Southeast Asia.

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confidence: 99%

Southeast Asian Dipterocarp origin and diversification driven by Africa-India floristic interchange

Bansal¹,

Morley

Nagaraju³

et al. 2022

Science

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“…The presence of Azolla cretacea, Gabonisporis vigourouxii, Aquilapollenites bengalensis and Jiangsupollis sp. suggests a Maastrichtian age (Samant et al, 2020).…”

Section: Resultsmentioning

confidence: 98%

Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: implications in understanding paleolake ecology

Samant

Kumar

Mohabey

et al. 2020

Palaeontol Electron

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“…Various studies related to detrital geochronology and geochemistry, lithological transitions, flora and faunal fossils have been reported from this region (Sakai, 1983;Sakai, 1984;Kimura et al, 1985;Matsumaru and Sakai, 1989;Sah and Schleich, 1990;DeCelles et al, 2004), showing diverse opinions on the paleoenvironmental condition. Generally, four distinctive views can be perceived on the paleoenvironment changes as 1) the humid climate prevailed during Cretaceous to Eocene (Neupane and Zhao, 2018;Neupane et al, 2021), 2) there was a paleoenvironmental transition from the pteridophytes dominated wet and humid environment during late Cretaceous (Mohabey et al, 1993;Srivastava, 2011;Prasad et al, 2018) to more humid environment in the entire Eocene revealed by evergreen broad-leaved forest forming coal and carbonaceous shale (Mehrotra, 2003;Srivastava, 2011;Shukla et al, 2014;Spicer et al, 2014;Samant et al, 2020), 3) the paleoclimate during Cretaceous to Eocene had been affected by the Tethys Sea and the Himalayan tectonic uplift rather than the global climate change (Bosboom et al, 2011;Licht et al, 2013;Licht et al, 2014), and 4) the Inter-tropical Convergence Zone (ITCZ) had driven the Eocene monsoon climate (Boos and Kuang, 2010;Spicer et al, 2016). The poor preservation of late Cretaceous marine and early Cenozoic terrestrial sequences in South Asia has been the main factor causing these debates.…”

Section: Introductionmentioning

confidence: 99%

Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment

et al. 2021

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The growth of the southern piedmont of the Himalayan boundary and its depositional setting has changed since uplift of the Himalaya due to continental Indian-Eurasian collision, which has resulted in variation in magnetic minerals in marine- and terrestrial-facies sediments. In this paper, we utilize rock magnetism data from the late Cretaceous to middle Eocene strata, including the Amile and Bhainskati formations from the Lesser Himalaya (western Nepal), to understand the mechanism controlling magnetic susceptibility (χ). The active tectonics strongly influenced saturation isothermal remanent magnetization (SIRM), HIRM, and hysteresis loops, forming both low-coercivity minerals in sediments with low χ from the terrestrial facies (zones I, IIIA, and V) and high-coercivity minerals in the sediments with high χ from the marine facies (zones II, IIIB and IV). Thermomagnetic κ-T curves and frequency-dependent χ (χfd%) values show that sediments with low χ and high χ carry magnetite with coarse non-superparamagnetic (SP) grains and hematite with SP grains, respectively. Comparing the χ data with the lithologic, sedimentary environments, geomorphic features, and sea level data, we propose that low χ values were mainly produced by an increase in terrigenous detrital influx during the regression period of the Tethys Sea, while high χ values formed in marine sediments, which prompted the appearance of ferromagnetic-antiferromagnetic and paramagnetic minerals during the transgression of the Tethys Sea.

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Maastrichtian Palynoflora from Deccan Volcanic Associated Sediments of Mahurzari, Nagpur District, Maharashtra: Age and Paleoenvironment with Comments on Megaflora

Cited by 12 publications

References 15 publications

Southeast Asian Dipterocarp origin and diversification driven by Africa-India floristic interchange

Southeast Asian Dipterocarp origin and diversification driven by Africa-India floristic interchange

Centropyxis aculeata (testate lobose amoebae) and associated diatoms from the intertrappean lacustrine sediments (Maastrichtian) of central India: implications in understanding paleolake ecology

Rock Magnetism of Late Cretaceous to Middle Eocene Strata in the Lesser Himalaya, Western Nepal: Inferences Regarding the Paleoenvironment

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