Preliminary reference Earth model
Physics of The Earth and Planetary Interiors · 1981
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Pronounced central uplift identified in the Bosumtwi impact structure, Ghana, using multichannel seismic reflection data
Research Article| October 01, 2002 Pronounced central uplift identified in the Bosumtwi impact structure, Ghana, using multichannel seismic reflection data Christopher A. Scholz; Christopher A. Scholz 1204 Heroy Geology Laboratory, Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Tobias Karp; Tobias Karp 2Institut für Geowissenschaften, Abteilung Geophysik Otto-Hahn-Platz 1, 24118 Kiel, Germany Search for other works by this author on: GSW Google Scholar Keely M. Brooks; Keely M. Brooks 3204 Heroy Geology Laboratory, Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Search for other works by this author on: GSW Google Scholar Bernd Milkereit; Bernd Milkereit 4Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada Search for other works by this author on: GSW Google Scholar Philip Y.O. Amoako; Philip Y.O. Amoako 5Ghana Geological Survey, P.O. Box M80, Accra, Ghana Search for other works by this author on: GSW Google Scholar Justice A. Arko Justice A. Arko 6Institute of Mining and Mineral Engineering, University of Science and Technology, Kumasi, Ghana Search for other works by this author on: GSW Google Scholar Author and Article Information Christopher A. Scholz 1204 Heroy Geology Laboratory, Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Tobias Karp 2Institut für Geowissenschaften, Abteilung Geophysik Otto-Hahn-Platz 1, 24118 Kiel, Germany Keely M. Brooks 3204 Heroy Geology Laboratory, Department of Earth Sciences, Syracuse University, Syracuse, New York 13244, USA Bernd Milkereit 4Department of Physics, University of Toronto, 60 St. George Street, Toronto, Ontario M5S 1A7, Canada Philip Y.O. Amoako 5Ghana Geological Survey, P.O. Box M80, Accra, Ghana Justice A. Arko 6Institute of Mining and Mineral Engineering, University of Science and Technology, Kumasi, Ghana Publisher: Geological Society of America Received: 22 Jan 2002 Revision Received: 13 Jun 2002 Accepted: 18 Jun 2002 First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2002) 30 (10): 939–942. https://doi.org/10.1130/0091-7613(2002)0302.0.CO;2 Article history Received: 22 Jan 2002 Revision Received: 13 Jun 2002 Accepted: 18 Jun 2002 First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Christopher A. Scholz, Tobias Karp, Keely M. Brooks, Bernd Milkereit, Philip Y.O. Amoako, Justice A. Arko; Pronounced central uplift identified in the Bosumtwi impact structure, Ghana, using multichannel seismic reflection data. Geology 2002;; 30 (10): 939–942. doi: https://doi.org/10.1130/0091-7613(2002)0302.0.CO;2 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 SocietyGeology Search Advanced Search Abstract The Lake Bosumtwi impact structure is the youngest and best-preserved complex terrestrial impact crater and serves as an important reference site for the study of cratering processes. Because the impacting body struck continental crystalline target rocks and not a submerged sedimentary platform, no significant backwash processes have modified the crater morphology. Not only may Bosumtwi contain the best-preserved central uplift structure on Earth, but it is the most accessible relatively large, young crater in the solar system generated in a large gravity field. There is a well-established link between the Lake Bosumtwi impact structure and the Ivory Coast tektite field, and the lacustrine sediments within the crater contain a unique 1 m.y. record of paleoclimate in the continental tropics south of the Sahel. Eight profiles of marine-type multichannel seismic reflection (MCS) data were acquired from the 8-km-diameter, ∼75-m-deep lake that fills much of the crater. These were augmented by wide-angle seismic data acquired with ocean-bottom hydrophones. MCS data reveal a well-defined central uplift near the northwest-central part of the lake and a maximum postimpact lacustrine sediment thickness of ∼310 m. The central uplift structure has a diameter of 1.9 km and a maximum height of 130 m above the annular moat inside the crater. An intermediate velocity layer (3200 m/s) beneath the lacustrine sediment is interpreted as fallback breccia or a breccia-melt horizon. The measured apparent depth of the crater (da) is 500 m, implying a slightly higher aspect ratio for the structure than predicted from published empirical relationships. The Bosumtwi structure is a small complex crater that deviates slightly from trends predicted from classical scaling laws, perhaps because of the effects of a large gravity field. You do not have access to this content, please speak to your institutional administrator if you feel you should have access.
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