Montanari, Alessandro; Hay, Richard L.; Alvarez, Walter; Asaro, Frank; Michel, Helen V.; Alvarez, Luis W.; Smit, Jan (1983): Spheroids at the Cretaceous-Tertiary boundary are altered impact droplets of basaltic composition. Geological Society of America (GSA), Boulder, CO, United States, Geology (Boulder), 11 (11), 668-671, georefid:1983-061203

Abstract:
Spheroids of K-feldspar in boundary clay at Caravaca, southern Spain. Sand-size spheroids of K-feldspar, glauconite, and magnetite-quartz have been found in the C-T boundary clay in northern Italy, and spheroids of K-feldspar and pyrite were found in the boundary clay at Deep Sea Drilling Project Site 465A, in the central Pacific. Textures are similar to those of rapidly crystallized feldspar and mafic silicates. Diagenetically altered microcrystalline spherules of basaltic composition produced by the impact of a large asteroid in an ocean basin at the end of the Cretaceous. Analogous to the glassy microtektites produced by impacts on more siliceous target rocks.--Modified journal abstract.
Coverage:
West: -2.2000 East: 12.3842 North: 45.3642 South: 32.0000
West: NaN East: NaN North: NaN South: NaN
Relations:
Expedition: 62
Site: 62-465
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=1983-061203 (c.f. for more detailed metadata)
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