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The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure : results from the Eyreville core holes
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SYSNO ASEP 0341087 Document Type M - Monograph Chapter R&D Document Type Monograph Chapter Title Geochemical characteristics of basement target rocks, suevitic glasses from the Eyreville B drill core, Chesapeake Bay impact structure, and three bediasites Author(s) Skála, Roman (GLU-S) RID, SAI, ORCID
Langenhorst, F. (DE)
Deutsch, A. (DE)Source Title The ICDP-USGS Deep Drilling Project in the Chesapeake Bay impact structure : results from the Eyreville core holes. - Boulder : Geological Society of America, 2009 / Gohn G. S. Koeberl C. Miller K. G. Reimold W. U. - ISSN 0072-1077 - ISBN 978-0-8137-2458-4 Pages s. 435-445 Number of pages 11 s. Number of copy 1000 Number of pages 975 Publication form WWW - WWW Language eng - English Country US - United States Keywords Chesapeake Bay impact crater ; Eyreville B core hole ; impact glasses ; bediasites ; tektites ; geochemistry Subject RIV DD - Geochemistry CEZ AV0Z30130516 - GLU-S (2005-2011) DOI 10.1130/2009.2458(19) Annotation The ICDP–USGS Eyreville B core hole sampled the 35.5-Ma-old Chesapeake Bay impact crater, Virginia. Chemical analyses of impact glasses, crystalline target rocks, and bediasites allowed better constraining of the precursor materials of glasses as well as of the bediasites. Statistical treatment diveded the data for the crystalline basement samples into four groups; two of those (various schists, meta-graywackes, and gneisses) display characteristics similar to the impact glasses in the suevites and the bediasites. The suevitic glasses show a broad range in composition at the micrometer scale. These data show the frequent presence of schlieren, and in particular, enhanced TiO2 contents that require admixture of an “amphibolitic component” to the melt. The three studied bediasites show only minor inter- and intrasample heterogeneity. The new data for the bediasites are compatible with heating of the “tektite melt” to extreme temperatures, followed by rapid quenching. Workplace Institute of Geology Contact Jana Popelková, popelkova@gli.cas.cz, Sabina Janíčková, Tel.: 233 087 272 Year of Publishing 2010
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