Morphology of Lonar Crater, India: Comparisons and implications

Fudali, R. F.; Milton, D. J.; Fredriksson, K.; Dube, A.

doi:10.1007/bf00897591

Cited by 75 publications

(133 citation statements)

References 13 publications

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“…Being the only well-preserved terrestrial crater to be formed entirely on basalt, it provides an excellent analogue for studying basaltic impact crater structures that are common on the surfaces of other terrestrial planets such as Mars (Hagerty and Newsom, 2003) and the Moon (Fudali et al, 1980). The crater has an average rim diameter of 1830 m and a rim-to-floor depth of about 150 m (apparent depth) (Fredriksson et al, 1973).…”

Section: Introductionmentioning

confidence: 99%

Active methylotrophs in the sediments of Lonar Lake, a saline and alkaline ecosystem formed by meteor impact

et al. 2010

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Lonar Lake is a unique saline and alkaline ecosystem formed by meteor impact in the Deccan basalts in India around 52 000 years ago. To investigate the role of methylotrophy in the cycling of carbon in this unusual environment, stable-isotope probing (SIP) was carried out using the onecarbon compounds methane, methanol and methylamine. Denaturing gradient gel electrophoresis fingerprinting analyses performed with heavy 13 C-labelled DNA retrieved from sediment microcosms confirmed the enrichment and labelling of active methylotrophic communities. Clone libraries were constructed using PCR primers targeting 16S rRNA genes and functional genes. Methylomicrobium, Methylophaga and Bacillus spp. were identified as the predominant active methylotrophs in methane, methanol and methylamine SIP microcosms, respectively. Absence of mauA gene amplification in the methylamine SIP heavy fraction also indicated that methylamine metabolism in Lonar Lake sediments may not be mediated by the methylamine dehydrogenase enzyme pathway. Many gene sequences retrieved in this study were not affiliated with extant methanotrophs or methylotrophs. These sequences may represent hitherto uncharacterized novel methylotrophs or heterotrophic organisms that may have been cross-feeding on methylotrophic metabolites or biomass. This study represents an essential first step towards understanding the relevance of methylotrophy in the soda lake sediments of an unusual impact crater structure.

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Section: Introductionmentioning

confidence: 99%

Active methylotrophs in the sediments of Lonar Lake, a saline and alkaline ecosystem formed by meteor impact

et al. 2010

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“…Aurangabad-Maharastra) is the sole from India [1]. We have earlier reported two 'impact crater' type geomorphic members [2].…”

Section: Introductionmentioning

confidence: 99%

Warangal Fort is an Impact Crater? Discussions and Hypothesis

Bhattacharya¹,

Ramancharala²

2017

J Geogr Nat Disast

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Warangal fort, India is the case study. Impact craters are catastrophic natural events. Circular rings are associated. Some have mono others have dual. Principles and mechanics of ring formation are discussed and a unique 'Cone Concept' is hypothecated. Anecdotal evidences are factored in multidisciplinary method. A shock wave divert is designed based on 'cone concept' and gem formation. Gem formation is also discussed. Impact preceded evolution of Homosapiens who may have occupied it as most, best, safe, preferred habitat. Useful in civil engineering, heritage studies and Smart Cities. A first time, original report.

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“…The validity of this hydrothermal hypothesis is supported by evidence of impactinduced hydrothermal systems in other terrestrial craters (e.g., Newsom et al 1986;McCarville and Crossey 1996;Allen, Gooding, and Keil 1982) (Table 1). Previous investigations of the Lonar crater briefly mentioned "alteration products" (e.g., Kieffer et al 1976;Fredriksson et al 1973;Fudali et al 1980;Nayak 1996), however, no detailed analyses were previously conducted. Therefore, a major goal of this study is to identify the major alteration phases in the available samples and to determine if the alteration was the result of impact-induced hydrothermal activity.…”

Section: Introductionmentioning

confidence: 99%

“…This relatively small crater is one of only two known terrestrial craters to be emplaced in basaltic target rock, the other being the Logancha crater in Russia (Feldman et al 1983). The floor of this crater currently lies 90 m below the pre-impact surface and the rim of the crater rises to a height of 30 m above the crater floor (Fudali et al 1980). The target rocks are predominantly classified as quartz normative tholeiites that have a moderate degree of iron enrichment (Roy and Chatterjee 1998).…”

Section: Introductionmentioning

confidence: 99%

Hydrothermal alteration at the Lonar Lake impact structure, India: Implications for impact cratering on Mars

Hagerty

Newsom

2003

Meteorit & Planetary Scien

101

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Abstract-The 50,000 year old, 1.8 km diameter Lonar crater is one of only two known terrestrial craters to be emplaced in basaltic target rock (the 65 million year old Deccan Traps). The composition of the Lonar basalts is similar to martian basaltic meteorites, which establishes Lonar as an excellent analogue for similarly sized craters on the surface of Mars. Samples from cores drilled into the Lonar crater floor show that there are basaltic impact breccias that have been altered by post-impact hydrothermal processes to produce an assemblage of secondary alteration minerals. Microprobe data and X-ray diffraction analyses show that the alteration mineral assemblage consists primarily of saponite, with minor celadonite, and carbonate. Thermodynamic modeling and terrestrial volcanic analogues were used to demonstrate that these clay minerals formed at temperatures between 130°C and 200°C. By comparing the Lonar alteration assemblage with alteration at other terrestrial craters, we conclude that the Lonar crater represents a lower size limit for impact-induced hydrothermal activity. Based on these results, we suggest that similarly sized craters on Mars have the potential to form hydrothermal systems, as long as liquid water was present on or near the martian surface. Furthermore, the Fe-rich alteration minerals produced by post-impact hydrothermal processes could contribute to the minor iron enrichment associated with the formation of the martian soil.

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Morphology of Lonar Crater, India: Comparisons and implications

Cited by 75 publications

References 13 publications

Active methylotrophs in the sediments of Lonar Lake, a saline and alkaline ecosystem formed by meteor impact

Active methylotrophs in the sediments of Lonar Lake, a saline and alkaline ecosystem formed by meteor impact

Warangal Fort is an Impact Crater? Discussions and Hypothesis

Hydrothermal alteration at the Lonar Lake impact structure, India: Implications for impact cratering on Mars

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