WorldCat Identities

石渡, 良志 1937-

Works: 6 works in 7 publications in 2 languages and 10 library holdings
Roles: Author
Publication Timeline
Most widely held works by 良志 石渡
Kankyōchū no fushoku busshitsu : Sono tokuchō to kenkyūhō( Book )

2 editions published in 2008 in Japanese and held by 3 WorldCat member libraries worldwide

Hōsha kagaku no kiso( Book )

1 edition published in 1962 in Japanese and held by 2 WorldCat member libraries worldwide

Yūki chikyū kagaku( Book )

1 edition published in 2004 in Japanese and held by 2 WorldCat member libraries worldwide

Yūki chikyū kagaku( Book )

1 edition published in 2004 in Japanese and held by 1 WorldCat member library worldwide

Geochemical analyses from the Caravaca K/T boundary section, Spain., supplementary data to: Kaiho, Kunio; Kajiwara, Yoshimichi; Tazaki, Kazue; Ueshima, Masato; Takeda, Nobuyori; Kawahata, Hodaka; Arinobu, Tetsuya; Ishiwatari, Ryoshi; Hirai, Akio; Lamolda, Marcos A (1999): Oceanic primary productivity and dissolved oxygen levels at the Cretaceous/Tertiary Boundary: Their decrease, subsequent warming, and recovery. Paleoceanography, 14(4), 511-524 by Kunio Kaiho( )

in English and held by 1 WorldCat member library worldwide

Thirty-six different geochemical and foraminiferal analyses were conducted on samples collected at closely spaced intervals across the Cretaceous/Tertiary (K/T) boundary exposed at Caravaca, Spain. A rapid reduction in the gradient between d13C values in fine fraction carbonate and benthic foraminiferal calcite and a decrease in the abundance of phosphorus (a proxy for organic carbon) and calcium were recorded in sediments 0-0.5 cm above the K/T boundary. These trends imply that an abrupt mass mortality occurred among pelagic organisms, leading to a significant reduction in the flux of organic carbon to the seafloor. In addition, variations in sulfur isotope ratios, the hydrocarbon-generating potential of kerogen (measured as the hydrogen index), and foraminiferal indices of dissolved oxygen level all imply that a rapid decrease in dissolved oxygen was coincident with the d13C event. Evidence of the low oxygen event has also been recognized in Japan and New Zealand, suggesting that intermediate water oxygen minima were widely developed during earliest Danian time. A threefold increase in the kaolinite/illite ratio and a 1.2 per mill decrease in d18O (carbonate fine fraction) were recorded in the basal 0.1-2 cm of Danian age sediments. These trends suggest that atmospheric warming and an increase in surface water temperature occurred 0-3 kyr after the d13C event. Recovery in the difference between d13C values in the carbonate fine fraction and in benthic foraminiferal calcite as well as increases in phosphorus and calcium contents occur at the base of planktonic foraminiferal Zone Pla, implying that an increase in primary productivity commenced some 13 kyr after the K/T boundary
Audience Level
Audience Level
  Kids General Special  
Audience level: 0.92 (from 0.89 for Yūki chik ... to 0.99 for Yūki chik ...)

Alternative Names
Ishiwatari, Ryoshi 1937-

イシワタリ, リョウシ

イシワタリ, リョウシ 1937-