Discovery of impact diamonds in a Fennoscandian crater and evidence for their genesis by solid-state transformation

Abstract

Research Article| August 01, 1999 Discovery of impact diamonds in a Fennoscandian crater and evidence for their genesis by solid-state transformation Falko Langenhorst; Falko Langenhorst 1Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany Search for other works by this author on: GSW Google Scholar George I. Shafranovsky; George I. Shafranovsky 2Karpinsky All-Russian Geological Research Institute (VSEGEI), Sredny prospekt 74, 199106 St. Petersburg, Russia Search for other works by this author on: GSW Google Scholar Victor L. Masaitis; Victor L. Masaitis 2Karpinsky All-Russian Geological Research Institute (VSEGEI), Sredny prospekt 74, 199106 St. Petersburg, Russia Search for other works by this author on: GSW Google Scholar Marjatta Koivisto Marjatta Koivisto 3Geological Survey of Finland, P.O. Box 96, FIN-02151 Espoo, Finland Search for other works by this author on: GSW Google Scholar Author and Article Information Falko Langenhorst 1Bayerisches Geoinstitut, Universität Bayreuth, D-95440 Bayreuth, Germany George I. Shafranovsky 2Karpinsky All-Russian Geological Research Institute (VSEGEI), Sredny prospekt 74, 199106 St. Petersburg, Russia Victor L. Masaitis 2Karpinsky All-Russian Geological Research Institute (VSEGEI), Sredny prospekt 74, 199106 St. Petersburg, Russia Marjatta Koivisto 3Geological Survey of Finland, P.O. Box 96, FIN-02151 Espoo, Finland Publisher: Geological Society of America First Online: 02 Jun 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (1999) 27 (8): 747–750. https://doi.org/10.1130/0091-7613(1999)027<0747:DOIDIA>2.3.CO;2 Article history First Online: 02 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation Falko Langenhorst, George I. Shafranovsky, Victor L. Masaitis, Marjatta Koivisto; Discovery of impact diamonds in a Fennoscandian crater and evidence for their genesis by solid-state transformation. Geology 1999;; 27 (8): 747–750. doi: https://doi.org/10.1130/0091-7613(1999)027<0747:DOIDIA>2.3.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 We report here the first discovery of impact diamonds on the Fennoscandian shield, in the deeply eroded Lappajärvi impact structure, Finland. The tabular morphology and microstructural twin bands provide evidence for the solid-state transformation of graphite to form these diamonds within <1 s. Strong corrosion and coating of surfaces with amorphous carbon may result from the thermal interaction of the diamonds with enclosing impact melt. Because of their unique characteristics, impact diamonds can be easily distinguished from kimberlitic diamonds. In general, durable impact diamonds may thus serve as indicators of ancient impact horizons that could mark biological and climatic catastrophes in Earth's history. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.