| タイトル | Preserved Flora and Organics in Impact Melt Breccias |
| 本文（外部サイト） | http://hdl.handle.net/2060/20140013110 |
| 著者（英） | Harris, R. Scott; Clemett, S. J.; Schultz, P. H.; Thomas-Keprta, K. L.; Zarate, M. |
| 発行日 | 2014-03-17 |
| 言語 | eng |
| 内容記述 | At least seven glass-bearing strata of varying ages occur at different horizons in the Pampean sediments of Argentina dating back to the Miocene. In a strict sense, these impact glasses are melt-matrix breccias composed of partially digested minerals clasts and basement fragments indicative of crater excavation. Ar-40/Ar-39 dating yield ages (+/- 2 sigma) of 6 +/- 2 Ka, 114 +/- 26 Ka, 230 +/- 30 Ka, 445 +/- 21 Ka, 3.27 +/- 0.08 Ma (near Mar del Plata = MdP), 5.28 +/- 0.04 Ma, and 9.21 +/- 0.08 Ma (near Chasico = CH) Where found in place (not reworked), these ages are consistent with the local stratigraphy and faunal assemblages. A striking property of some of these impact glasses is the encapsulation of preserved fragments of floral (and even soft-tissue faunal remains). Here we identify retained organics and describe a likely process of encapsulation and preservation. |
| NASA分類 | Geosciences (General) |
| レポートNO | LPI Contrib 2002
JSC-CN-30760 |
| 権利 | Copyright, Distribution under U.S. Government purpose rights |
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