Impact cratering — fundamental process in geoscience and planetary science

Pati, Jayanta Kumar; Reimold, W. U.

doi:10.1007/s12040-007-0009-3

Cited by 25 publications

(16 citation statements)

References 92 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…, ). Subsequent investigations yielded evidence for the presence of diagnostic microscopic shock metamorphic features, which resulted in the confirmation of Dhala as an impact structure (Pati ; Pati and Reimold ; Pati et al. 2008a).…”

Section: Introductionmentioning

confidence: 99%

Documentation of shock features in impactites from the Dhala impact structure, India

Pati

Poelchau

Reimold

et al. 2019

Meteorit & Planetary Scien

View full text Add to dashboard Cite

The fundamental approach for the confirmation of any terrestrial meteorite impact structure is the identification of diagnostic shock metamorphic features, together with the physical and chemical characterization of impactites and target lithologies. However, for many of the approximately 200 confirmed impact structures known on Earth to date, multiple scale‐independent tell‐tale impact signatures have not been recorded. Especially some of the pre‐Paleozoic impact structures reported so far have yielded limited shock diagnostic evidence. The rocks of the Dhala structure in India, a deeply eroded Paleoproterozoic impact structure, exhibit a range of diagnostic shock features, and there is even evidence for traces of the impactor. This study provides a detailed look at shocked samples from the Dhala structure, and the shock metamorphic evidence recorded within them. It also includes a first report of shatter cones that form in the shock pressure range from ~2 to 30 GPa, data on feather features (FFs), crystallographic indexing of planar deformation features, first‐ever electron backscatter diffraction data for ballen quartz, and further analysis of shocked zircon. The discovery of FFs in quartz from a sample of the MCB‐10 drill core (497.50 m depth) provides a comparatively lower estimate of shock pressure (~7–10 GPa), whereas melting of a basement granitoid infers at least 50–60 GPa shock pressure. Thus, the Dhala impactites register a strongly heterogeneous shock pressure distribution between <2 and >60 GPa. The present comprehensive review of impact effects should lay to rest the nonimpact genesis of the Dhala structure proposed by some earlier workers from India.

show abstract

Section: Introductionmentioning

confidence: 99%

Documentation of shock features in impactites from the Dhala impact structure, India

Pati

Poelchau

Reimold

et al. 2019

Meteorit & Planetary Scien

View full text Add to dashboard Cite

show abstract

“…We also do not discuss the rather extensive literature on the structural geology of terrestrial impact craters (see Earth Impact Database, 2007) despite its importance to the understanding of deformation processes on the Earth and other planets (e.g., Laney and Van Schmus, 1978;Price and Cosgrove, 1990, pp. 112-118;Kriens et al, 1999;Huntoon, 2000;Kenkmann, 2002;Kenkmann et al, 2005;Pati and Reimold, 2007).…”

Section: Introductionmentioning

confidence: 99%

Interpretation and analysis of planetary structures

Schultz

Hauber

Kattenhorn

et al. 2010

Journal of Structural Geology

View full text Add to dashboard Cite

“…A few minor phases of volcanism took place even contemporaneous to sedimentation and interaction between two resulted in the formation of peperites. Therefore, the presence of peperites close to the rhyolite-sediment interface is a strong evidence for the volcanic origin of the Dhala structure/basin as suggested by Jain et al (2001) and inconsistent with either its impact related (Pati et al 2007(Pati et al , 2008 or shear rotation (Basu, 2007).…”

Section: Significance Of Mohar Peperitesmentioning

confidence: 95%

“…Jain et al (2001) opined that it was the result of central Plinian type volcanic explosion, whereas others interpreted it as an impact related structure (Pati and Reimold 2007;Pati et al 2008). Basu (2007) invoked shear rotation volcanism can provide age constraint on the sedimentation.…”

mentioning

confidence: 99%

Peperite Occurrence and its Implications on Origin and Temporal Development of the Proterozoic Dhala Basin, Mohar Area, Shivpuri District, Madhya Pradesh

Sinha

Pandey

Bhairam

et al. 2011

Journal of the Geological Society of India

View full text Add to dashboard Cite

In the western part of Bundelkhand massif, a caldera with intra-caldera sediments, known as Dhala Formation, occurs as an outlier in and around Mohar village of Shivpuri district, Madhya Pradesh. For the first time, occurrence of peperite is being reported from the basal part of the Dhala sediment. Two types of peperites have been recognized: blocky and fluidal or globular with variable morphology. In peperitic zones, features like soft sediment deformations, presence of sediment into the rhyolite along cracks, vesiculation of the sediments and other evidences suggestive of sediment fluidization are some definite characteristics of interaction of hot magma with wet sediments forming peperite. The occurrence of peperites reflects the contemporaniety of deposition of the Dhala sediments and volcanism, which is well in accordance to the volcanic origin of Dhala structure. Further, the nature of unconformity between the Dhala and overlying Kaimur which is characterized by merely a few centimeter thick pebbly/conglomeratic bed does not appear to represent a large hiatus as expected between the Semri and Kaimur of Vindhyan Supergroup. So, the contemporaniety of the Dhala Formation (at least the lower part) as reflected by occurrence of peperites, coupled with the available age of the rhyolite and the nature of the unconformity between the Dhala and overlying Kaimur provide convincing evidence to correlate the Dhala Formation with the Lower part of the Kaimur and unlikely with the Semri Group or Bijawar as proposed earlier.

show abstract

Impact cratering — fundamental process in geoscience and planetary science

Cited by 25 publications

References 92 publications

Documentation of shock features in impactites from the Dhala impact structure, India

Documentation of shock features in impactites from the Dhala impact structure, India

Interpretation and analysis of planetary structures

Peperite Occurrence and its Implications on Origin and Temporal Development of the Proterozoic Dhala Basin, Mohar Area, Shivpuri District, Madhya Pradesh

Contact Info

Product

Resources

About