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タイトル Elemental and Sr isotope profiles of Cretaceous-Tertiary (K-T) boundary layers at Medetli, Gölpazari, northwestern Turkey(松丸国照教授退職記念特集)<数学・自然科学>
別タイトル
トルコ北西部のギョルパザリ地域メデトルの白亜紀 : 第三紀(K-T)の化学元素とストロンチウム同位体分析概要
著者
荒川, 洋二 (ARAKAWA, Yoji)
Earth Evolution Sciences. Graduate School of Life and Environmental Sciences. University of Tsukuba
天川, 裕史 (AMAKAWA, Hiroshi)
Ocean Research Institute. University of Tokyo
松丸, 国照 (MATSUMARU, Kuniteru)
Department of Geology. Faculty of Education. Saitama University
出版者 埼玉大学教育学部
日付
出版年: 2007 - 2007
作成日: 2008-07-30
更新日: 2014-11-25
上位タイトル
埼玉大学紀要. 教育学部 (Journal of Saitama University. Faculty of Education). Vol.56, No.1  (2007. ) ,p.373- 384
識別番号
ISSN
18815146
抄録 Major and trace element concentrations and Sr isotope ratios were determined for the
Cretaceous-Tertiary (K-T) transitional layers in Medetli. Gblpazari. northwestern Turkey. Late Maastrichtian gray colored sandstone layer (layer A) is overlain by yellow colored sandstone layer (layer B) with thin goethite-rich layers. Lower Paleocene limestone (layer C) overlies layer B. Fossils are absent in layer B. Major elements such as Ab03. MgO. MnO. NazO and K20 are slightly lower in layer B compared with layer A. Trace elements. such as Ba. Rb and Y. are relatively high in layer A than in layer B. while Sr is clearly rich in layer B. Distinct peaks of Fe. Ni. Co, Cr. As and Sb are found in a goethite-rich layer. The Sr isotope ratios (initial 87Sr /86S r ratios) of samples change from layer A (0.7099-0.7112) to layer B (0.7079-0.7084). This abrupt change of Sr isotoperatios is explained by a drastic increase of precipitation rate of sea water Sr to layer B rather than in layer A. and this change may b related to the K-T event. Association with these results and element concentrations including Ir (Arakawa et aJ .. (2003). the actual K-T boundary is situated probably between the top of layer A and the bottom of layer B. In the Medetli region. The deposition of the top of layer A and probably the layer B are considered to have been formed by the K-T and its successive events.
言語
eng
資源タイプ text
ジャンル Departmental Bulletin Paper
Index
/ Public / 埼玉大学 / 教育学部
/ Public / 主題別 / 数物系科学 / 地球惑星科学
/ Public / ジャンル別 / 研究紀要 / 埼玉大学 / 教育学部紀要
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