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Geology of Lonar Crater, India

2009; Geological Society of America; Volume: 122; Issue: 1-2 Linguagem: Inglês

10.1130/b26474.1

1943-2674

Adam C. Maloof, Sarah T. Stewart, B. P. Weiss, S. A. Soule, Nicholas L. Swanson‐Hysell, K. L. Louzada, I. Garrick‐Bethell, P. M. Poussart,

earthquake and tectonic studies

Research Article| January 01, 2010 Geology of Lonar Crater, India Adam C. Maloof; Adam C. Maloof 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA Search for other works by this author on: GSW Google Scholar Sarah T. Stewart; Sarah T. Stewart 2Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Benjamin P. Weiss; Benjamin P. Weiss 3Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Samuel A. Soule; Samuel A. Soule 4Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, Massachusetts 02543, USA Search for other works by this author on: GSW Google Scholar Nicholas L. Swanson-Hysell; Nicholas L. Swanson-Hysell 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA Search for other works by this author on: GSW Google Scholar Karin L. Louzada; Karin L. Louzada 2Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Search for other works by this author on: GSW Google Scholar Ian Garrick-Bethell; Ian Garrick-Bethell 3Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA Search for other works by this author on: GSW Google Scholar Pascale M. Poussart Pascale M. Poussart 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Adam C. Maloof 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA Sarah T. Stewart 2Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Benjamin P. Weiss 3Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA Samuel A. Soule 4Woods Hole Oceanographic Institution, Geology and Geophysics, Woods Hole, Massachusetts 02543, USA Nicholas L. Swanson-Hysell 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA Karin L. Louzada 2Department of Earth and Planetary Sciences, 20 Oxford Street, Cambridge, Massachusetts 02138, USA Ian Garrick-Bethell 3Department of Earth, Atmospheric, and Planetary Sciences, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, Massachusetts 02139, USA Pascale M. Poussart 1Department of Geosciences, Princeton University, Guyot Hall, Washington Road, Princeton, New Jersey 08544, USA †E-mail: sstewart@eps.harvard.edu Publisher: Geological Society of America Received: 03 Jun 2008 Revision Received: 08 Nov 2008 Accepted: 15 Nov 2008 First Online: 08 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 © 2010 Geological Society of America GSA Bulletin (2010) 122 (1-2): 109–126. https://doi.org/10.1130/B26474.1 Article history Received: 03 Jun 2008 Revision Received: 08 Nov 2008 Accepted: 15 Nov 2008 First Online: 08 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Adam C. Maloof, Sarah T. Stewart, Benjamin P. Weiss, Samuel A. Soule, Nicholas L. Swanson-Hysell, Karin L. Louzada, Ian Garrick-Bethell, Pascale M. Poussart; Geology of Lonar Crater, India. GSA Bulletin 2010;; 122 (1-2): 109–126. doi: https://doi.org/10.1130/B26474.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Lonar Crater, India, is one of the youngest and best preserved impact structures on Earth. The 1.88-km-diameter simple crater formed entirely within the Deccan traps, making it a useful analogue for small craters on the basaltic surfaces of the other terrestrial planets and the Moon. In this study, we present a meter-scale-resolution digital elevation model, geological map of Lonar Crater and the surrounding area, and radiocarbon ages for histosols beneath the distal ejecta. Impact-related deformation of the target rock consists of upturned basalt flows in the upper crater walls and recumbent folding around rim concentric, subhorizontal, non-cylindrical fold axes at the crater rim. The rim-fold hinge is preserved around 10%–15% of the crater. Although tearing in the rim-fold is inferred from field and paleomagnetic observations, no tear faults are identified, indicating that large displacements in the crater walls are not characteristic of small craters in basalt. One significant normal fault structure is observed in the crater wall that offsets slightly older layer-parallel slip faults. There is little fluvial erosion of the continuous ejecta blanket. Portions of the ejecta blanket are overlain by aerodynamically and rotationally sculpted glassy impact spherules, in particular in the eastern and western rim, as well as in the depression north of the crater known as Little Lonar. The emplacement of the continuous ejecta blanket can be likened to a radial ground-hugging debris flow, based on the preserved thickness distribution of the ejecta, the efficient exchange of clasts between the ejecta flow and the underlying histosol, and the lack of sorting and stratification in the bulk of the ejecta. The ejecta profile is thickened at the distal edge and similar to fluidized ejecta structures observed on Mars. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.