{"id":21835,"date":"2020-04-23T15:40:32","date_gmt":"2020-04-23T13:40:32","guid":{"rendered":"http:\/\/karmaka.de\/?p=21835"},"modified":"2020-04-23T15:40:34","modified_gmt":"2020-04-23T13:40:34","slug":"ramgarh-rajasthan-india-a-10-km-diameter-complex-impact-structure","status":"publish","type":"post","link":"https:\/\/karmaka.de\/?p=21835","title":{"rendered":"Ramgarh, Rajasthan, India: A 10 km diameter complex impact structure<span class=\"badge-status\" style=\"background:#787878\">OPEN ACCESS<\/span>&nbsp;"},"content":{"rendered":"\n<p>Thomas Kenkmann, Gerwin Wulf, Amar Agarwal<\/p>\n\n\n\n<p>Meteoritics &amp; Planetary Science<br>First Published: 23 April 2020<\/p>\n\n\n\n<p><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/full\/10.1111\/maps.13454\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>LINK (OPEN ACCESS)<\/strong><\/a><br><a href=\"https:\/\/onlinelibrary.wiley.com\/doi\/epdf\/10.1111\/maps.13454\" target=\"_blank\" rel=\"noreferrer noopener\"><strong>PDF (OPEN ACCESS)<\/strong><\/a><\/p>\n\n\n\n<p class=\"justify-text\">&#8220;The Ramgarh structure is a morphological landmark in southeastern Rajasthan, India. Its 200 m high and 3.5\u20134 km wide annular collar has provoked many hypotheses regarding its origin, including impact. Here, we document planar deformation features, planar fractures, and feather features in quartz grains of the central part of the Ramgarh structure, which confirm its impact origin. The annular collar does not mark the crater rim but represents the outer part of a central uplift of an approximately 10 km diameter complex impact structure. The apparent crater rim is exposed as a low\u2010angle normal fault and can be traced as lineaments in remote sensing imagery. The central uplift shows a stratigraphic uplift of ~1000 m and is rectangular in shape. It is dissected by numerous faults that are co\u2010genetic with the formation of the central uplift. The central uplift has a bilateral symmetry along an SW\u2010NE axis, where a large strike\u2010slip fault documents a strong horizontal shear component. This direction corresponds to the assumed impact trajectory from the SW toward the NE. The uprange sector is characterized by concentric reverse faults, whereas radial faults dominate downrange. Sandstones of the central uplift are infiltrated by Fe\u2010oxides and suggest an impact\u2010induced hydrothermal mineralization overprint. The impact may have occurred into a shallow water environment as indicated by soft\u2010sediment deformation features, observed near the apparent crater rim, and the deposition of a diamictite layer above them. Gastropods embedded in the diamictite have Middle Jurassic age and may indicate the time of the impact.&#8221;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Thomas Kenkmann, Gerwin Wulf, Amar Agarwal Meteoritics &amp; Planetary ScienceFirst Published: 23 April 2020 LINK (OPEN ACCESS)PDF (OPEN ACCESS) &#8220;The Ramgarh structure is a morphological landmark in southeastern Rajasthan, India. Its 200 m high and&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[90],"tags":[92,5526],"_links":{"self":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21835"}],"collection":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=21835"}],"version-history":[{"count":1,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21835\/revisions"}],"predecessor-version":[{"id":21836,"href":"https:\/\/karmaka.de\/index.php?rest_route=\/wp\/v2\/posts\/21835\/revisions\/21836"}],"wp:attachment":[{"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=21835"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=21835"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/karmaka.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=21835"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}