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- Title
Malani rhyolite: highly eroded complex crater.
- Authors
Sisodia, M. S.
- Abstract
The origin of the Malani beds of India has been construed to an event of anorogenic felsic magmatism that began at ∼750 Ma and ended at 650 Ma. No consensus exists regarding their nomenclature, origin and duration of magmatism. These beds have been inferred to have originated due to volcanism but show many features that are unusual for any volcanic formation, such as they are devoid of any penetrative deformation although they are supposed to have resulted due to three phases of igneous activity; they evolved due to 'crustal-volcanism'; they do not show any thrust zone or tectonic melange; their time of evolution does not coincide with any major tectonomagmatic event recognized in the geological history. These features are unusual for a volcanic formation, but are common for an impact crater. The major rock type of the Malani beds is rhyolite, which at places is mixed with sediments and often shows minor fractures and slips. This geology is analogous to Dhala Basin of Madhya Pradesh, India, which has been confirmed as an impact crater. In addition to these features, stishovite has been reported from the Malani beds, which is considered as an unambiguous evidence for impact crater. Thus the area representing Malani rhyolite is a highly eroded, complex, impact crater.
- Subjects
MALANI (India); INDIA; RHYOLITE; MAGMATISM; VOLCANISM; STRUCTURAL geology
- Publication
Current Science (00113891), 2011, Vol 101, Issue 7, p946
- ISSN
0011-3891
- Publication type
Article