geoscience.net logo
+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Osmium isotope constraints on the proportion of bolide component in Chicxulub impact melt rocks


, : Osmium isotope constraints on the proportion of bolide component in Chicxulub impact melt rocks. Meteoritics and Planetary Science 39(6): 1003-1008

The spatial distribution and amount of material transferred from the bolide involved in the Cretaceous/Tertiary (K/T) event to the target rocks at Chicxulub is still poorly constrained. In this study, Re-Os isotopic analyses of impact melt breccias and lithic clasts from the Yaxcopoil-1 (Yax-1) borehole were used to determine the distribution and proportion of the bolide component in the target rocks. Because of the much greater concentration of Os in chondritic meteorites compared to the target rocks, little addition of the bolide component would be necessary to greatly perturb the Os concentration and isotopic composition of target rocks. Hence, this is a very sensitive means of examining bolide contributions to the target rocks. For the examined suite of samples, the initial (super 187) Os/ (super 188) Os ratios vary from 0.19 to 2.3. Conservative mixing calculations suggest that the bolide component comprised as much as approximately 0.1%, by mass, of some samples. Most samples, however, have negligible contributions from the bolide. No samples have Os that is dominated by the bolide component, so for this suite of samples, it is impossible to fingerprint the chemical nature of the bolide using relative abundances of siderophile elements. These results suggest that the bolide did not contribute a significant amount of material to the target rocks. This may, in turn, indicate that most of the bolide was vaporized upon impact or otherwise ejected without mixing with the melt from the target.

US$19.90

DOI: 10.1111/j.1945-5100.2004.tb00941.x


Other references

Ma, J-guang.; Yang, X.; Xue, Z-qiang.; Du, P.; He, W.; Sun, G-ci., 2006: Latissimus dorsi transfer to restore thoracic malformation of Poland's syndrome. To study the methods and points for attention of latissimus dorsi muscle flap transplantation to correct the thoracic malformation of Poland's syndrome. From 1995 to 2003, 10 patients were diagnosed of Poland's syndrome with absence of p...

Jordanov J.S.; Angelova P.A., 1979: Responsiveness of the ovarian steroidogenic cells to gonadotropins in the chick embryo. Vassileva-Popova, J G And E V Jensen (Ed ) Biophysical And Biochemical Information Transfer in Recognition; Proceedings Of The 2nd International Colloquium on Physical And Chemical Information Transfer in Regulation Of Reproduction And Aging, Oct 2-8, 1977, Varna, Bulgaria Xvii+875p Plenum Press: New York, N Y , Usa; London, England Illus P183-188

Zhu, M.; Wei, Y.; Geißler, C.; Abschlag, K.; Corbalán Campos, J.; Hristov, M.; Möllmann, J.; Lehrke, M.; Karshovska, E.; Schober, A., 2017: Hyperlipidemia-Induced MicroRNA-155-5p Improves β-Cell Function by Targeting iMafb. A high-fat diet increases bacterial lipopolysaccharide (LPS) in the circulation and thereby stimulates glucagon-like peptide 1 (GLP-1)-mediated insulin secretion by upregulating interleukin-6 (IL-6). Although microRNA-155-5p (miR-155-5p), which in...

Killeen, P.R., 1982: Incentive theory 2. models for choice. Incentive theory is extended to account for concurrent chained schedules of reinforcement. The basic model consists of additive contributions from the primary and secondary effects of reinforcers, which serve to direct the behavior activated by re...

Lawes, M.J.; Obiri, J.A.F., 2003: Canopy gaps in subtropical forest in South Africa: Size of the species pool and not the number of available niches limits species richness. We consider whether species richness in canopy gaps in coastal scarp forest (South Africa) is constrained by competition for a limited number of available niches or is a chance effect of recruitment and dispersal limitation on species derived from...

Montgomery, A.B., 1989: Recent developments in the therapy and management of Pneumocystis carinii pneumonia in patients with AIDS. Aids Clinical Review: 109-124

Anderson, G.M.; Heinke, D.; Humphreys, G.W., 2012: Bottom-up guidance to grouped items in conjunction search: evidence for color grouping. Previous studies have demonstrated that observers can search through a subset of items carrying a minority feature to find a conjunction target (). We examined whether subset search takes place when participants have less specific foreknowledge of...

Epstein A.L.; Marder R.J.; Winter J.N.; Fox R.I., 1984: 2 new mono clonal antibodies ln 1 ln 2 reactive in b 5 formalin fixed paraffin embedded tissues with follicular center and mantle zone human b lymphocytes and derived tumors. Two monoclonal antibodies (LN-1, LN-2) reactive with B lymphocytes in B5 formalin-fixed, paraffin-embedded tissue sections were produced by utilizing cell extracts from pokeweed mitogen-stimulated peripheral blood lymphocytes and diffuse histiocyt...

Oikawa, S.; Kita, T.; Mabuchi, H.; Matsuzaki, M.; Matsuzawa, Y.; Nakaya, N.; Saito, Y.; Sasaki, J.; Shimamoto, K.; Itakura, H., 2006: Risk of coronary events in Japanese patients with both hypercholesterolemia and type 2 diabetes mellitus on low-dose simvastatin therapy: implication from Japan Lipid Intervention Trial (J-LIT). Hypercholesterolemic patients with type 2 diabetes mellitus are at increased risk of coronary heart disease (CHD); however, direct evidence is very limited in Japanese patients. The J-LIT is the first nationwide study conducted to assess the rela...

Matsuura, S.; Koyama, N.; Kashimata, M.; Hayashi, H.; Kikuta, A., 2007: Temporary accumulation of glycogen in the epithelial cells of the developing mouse submandibular gland. Temporary accumulation of glycogen in the epithelial cells of the developing mouse submandibular gland was examined under light microscopic histochemistry and electron microscopy. To avoid loss of water-soluble glycogen during histological tissue...