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iridium

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Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(03)
Series: GSA Special Papers
Published: 01 September 2014
DOI: 10.1130/2014.2505(13)
Series: GSA Special Papers
Published: 01 January 2014
DOI: 10.1130/2014.2503(03)
... on lithological criteria, enrichment of iridium and osmium, and osmium isotope ratios. The impact claystone also contains a Cyathidites fern spike. The first continuous lignite horizon in the section immediately overlies this claystone and represents the Hell Creek–Fort Union formational contact. A tuff ~3 m...
Series: GSA Special Papers
Published: 01 April 2009
DOI: 10.1130/2009.2452(04)
Series: GSA Special Papers
Published: 01 January 2007
DOI: 10.1130/2008.2437(09)
... by what could be called impact exuberance . This new reality is driven largely by the belief that large impacts must cause catastrophic mass extinctions and that the telltale evidence of impacts, such as impact breccia, glass spherules, shocked minerals, and iridium anomaly, must therefore be coincident...
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Journal Article
Published: 01 April 2001
The Canadian Mineralogist (2001) 39 (2): 447-471.
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Journal Article
Journal: Geology
Published: 01 December 2000
Geology (2000) 28 (12): 1103-1106.
... of the Phanerozoic. 15 09 2000 06 03 2000 13 09 2000 Geological Society of America 2000 impacts spherules Archean iridium platinum group elements Discrete layers rich in distinctive sand-sized spherules of former silicate melt that have been interpreted as distal impact ejecta...
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Journal Article
Journal: Geology
Published: 01 December 2000
Geology (2000) 28 (12): 1119-1122.
... margin of North America catastrophically failed during the Cretaceous-Paleogene impact. 15 09 2000 03 05 2000 11 09 2000 Geological Society of America 2000 tsunami Chicxulub impact Bermuda Rise turbidite platinum iridium seismic stratigraphy dinoflagellate...
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Journal Article
Published: 01 November 2000
Bulletin de la Société Géologique de France (2000) 171 (6): 629-636.
... to the occurrence of a peak of iridium and Ni-rich spinel abundance. The impact level is a jarosite nodule-rich horizon upon which the emphasis is placed: the jarosite nodules, initially present as pyrite nodules, may be interpreted as reflecting reducing depositional conditions at the K/T boundary. Trace metal...
Journal Article
Published: 01 March 2000
Journal of the Geological Society (2000) 157 (2): 257-260.
...S. BAJPAI; G. V. R. PRASAD Abstract Micropalaeontological investigations of an iridium‐bearing, lacustrine intertrappean sedimentary sequence at the western margin of the Deccan volcanic province near Anjar, have revealed a profuse occurrence of theropod eggshell fragments (ornithoid type) in beds...
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Journal Article
Journal: Geology
Published: 01 February 2000
Geology (2000) 28 (2): 131-134.
... , v. v. 1 pp. 197 ߝ 227 . Fleet , M.E. , Stone , W.E. , and Crocket , J.H. , 1991 , Partitioning of palladium, iridium, and platinum between sulphide liquid and basalt melt: Effect of melt composition, concentration, and oxygen fugacity : Geochimica et Cosmochimica Acta , v. v...
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Journal Article
Published: 01 September 1999
South African Journal of Geology (1999) 102 (3): 178-183.
Journal Article
Journal: Geology
Published: 01 January 1999
Geology (1999) 27 (1): 75-78.
Journal Article
Journal: Geology
Published: 01 November 1998
Geology (1998) 26 (11): 979-982.
... bolide through chemical and mineralogical characterization of boundary breccias, search for shocked quartz, and analysis for iridium in Permian-Triassic boundary sections at Graphite Peak and Mount Crean, Antarctica, and Wybung Head, Australia. Thin claystone breccias at the isotopically...
Journal Article
Published: 01 July 1998
Bulletin de la Société Géologique de France (1998) 169 (4): 515-526.
...Robert Rocchia; Eric Robin Abstract The Cretaceous-Tertiary (K/T) boundary is marked by the collision of the Earth with an asteroid or a comet. This event produced high concentrations of iridium and other PGEs in K/T boundary sediments. Although delivered by a very brief event, Ir is observed over...
Journal Article
Published: 01 May 1998
Journal of Paleontology (1998) 72 (3): 556-571.
...William J. Zinsmeister Abstract The discovery of a fish bone layer immediately overlying the K-T iridium anomaly on Seymour Island. Antarctic Peninsula, which may represent the first documented mass kill associated with the impact event, together with new faunal data across the boundary has...
Journal Article
Journal: Geology
Published: 01 April 1998
Geology (1998) 26 (4): 307-310.
...Olivier Pierrard; Eric Robin; Robert Rocchia; Alessandro Montanari Abstract Evidence of a major cosmic event at the end of the Eocene is given by the finding of at least one, possibly two or more, impact horizons containing microtektites, microkrystites, shocked quartz, and unusually high iridium...
Journal Article
Journal: Geology
Published: 01 March 1998
Geology (1998) 26 (3): 195-198.
Journal Article
Published: 01 December 1997
The Canadian Mineralogist (1997) 35 (6): 1431-1439.
Journal Article
Journal: Geology
Published: 01 November 1997
Geology (1997) 25 (11): 1019-1022.
...R. M. Hough; I. Gilmour; C. T. Pillinger; F. Langenhorst; A. Montanari Abstract Diamonds, up to 30 µm in size, were found in the iridium-rich layer from the K-T boundary site at Arroyo El Mimbral and the spherule bed from Arroyo El Peñon, northeastern Mexico. Stepped heating experiments indicate...