巻号一覧
64 巻 (2010)
- 6 号 p. 209-
- 5 号 p. 179-
- 4 号 p. 147-
- 3 号 p. 93-
- 2 号 p. 53-
- 1 号 p. 1-
64 巻, 6 号
選択された号の論文の4件中1～4を表示しています
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河野 俊夫, 多賀 優, 山下 信彦原稿種別: 本文
2010 年 64 巻 6 号 p. 209-210
発行日: 2010/11/25
公開日: 2017/05/16
ジャーナル オープンアクセスPDF形式でダウンロード (1336K) -
Yoshihiro UJIIE, Mitsunari TAKIYA, Takehiro AIZAWA, Maiko SHIMOFUSA原稿種別: Article
2010 年 64 巻 6 号 p. 211-218
発行日: 2010/11/25
公開日: 2017/05/16
ジャーナル オープンアクセスAlgae are regarded as possible excellent progenitors of petroleum hydrocarbons. They have been considered to be transformed into type I kerogen in sediments during diagenesis, which generates a large quantity of petroleum hydrocarbons on catagenesis and metagenesis. Living green algae of Chlorella vulgaris were heated to 72-650℃ for 24 hours under the N_2 in open system in the laboratory to investigate the changes in physical and chemical properties of green algae with regards to the hydrocarbon generation. The atomic H/C vs. O/C ratios indicate that the green algae unheated and heated at the temperature below 233℃ belong to type II kerogen, and shift their position towards the origin of the coordinate axes along an extension of the evolution path for type II kerogen on a van Krevelen diagram. The green algae heated at the temperature from 258 to 331℃ belong to type III kerogen and evolve along the evolution path for this type kerogen. After being heated at 380℃ the green algae become "residual organic matter" described by Tissot and Welte (1984), which is characterized by abnormally low H/C ratios associated with high O/C ratios. The kerogen types of the heated algae samples appear to be transformed from II through III to "residual organic matter" towards the origin on a curve crossing the evolution path of type III kerogen on a van Krevelen diagram. It was shown that heated green algae have decreasing trends in weight, atomic H/C and N/C ratios, and brightness (statistical Thermal Alteration Index) with increasing temperature. The changes in the atomic H/C ratio indicated that hydrocarbon generation from living green algae should take place mainly in the temperature range of about 111 and 405℃, which infers green algae have more potential for petroleum generation than pollen (Pinus and Styrax), spores (Athyrium) and leaves (Pinus) as precursors of type II kerogen, and woods (Pinus) as precursors of type III kerogen.抄録全体を表示PDF形式でダウンロード (1068K) -
野尻湖哺乳類グループ原稿種別: 本文
2010 年 64 巻 6 号 p. 219-233
発行日: 2010/11/25
公開日: 2017/05/16
ジャーナル オープンアクセスヘラジカ Alces alcesは,ユーラシア大陸や北アメリカ大陸の冷温帯や寒帯において,主に高緯度針葉樹林に生息する,現生シカ類中最大の種類である.日本から報告されているMIS3末期からMIS2にかけての化石は,現生と化石を通じてもこのシカの分布の南限である.2008年,長野県北東部の野尻湖西岸に分布する上部更新統の野尻湖層立が鼻砂部層T3ユニット(44,000y.B.P.;MIS3)から,野尻湖層からは初となるヘラジカ化石が産出した.この標本(17N III F18-2)は左下顎骨の一部で,ほぼ完全なM3を伴う.さらにその近傍で採集されていた16N III F18-36(ほぼ完全な左下顎のM2)と10N III E17-88(左下顎骨の一部)が,17N III F18-2に接合した.野尻湖層の脊椎動物化石群は,ナウマンゾウとヤベオオツノジカが圧倒的に優勢であるが,より冷涼な気候を好む"マンモス動物群"の一要素とされるヘラジカがそれに加わることは,野尻湖地域の環境変遷を考察する上で重要である.このヘラジカは日本最古の化石記録で,MIS3以前の本州にヘラジカが生息したことを示す.そして後期更新世の古気候や海洋地形等から推測すると,ヘラジカが日本列島へ侵入したのはMIS4の寒冷期であった可能性が高い.抄録全体を表示PDF形式でダウンロード (3654K) -
河野 俊夫, 多賀 優, 山下 信彦原稿種別: 本文
2010 年 64 巻 6 号 p. 235-240
発行日: 2010/11/25
公開日: 2017/05/16
ジャーナル オープンアクセスLuminescence properties of selenite from the Jirantai Saline Lake, Inner Mongolia, China were studied. Almost all of the selenite from this locality fluoresces either cyan white (sample name: MGW) or yellow (sample name: MGY) under both long- and short-wave ultraviolet (UV) light. When the selenite face of section (010) is irradiated with UV light, {111} and {103} sectors emit fluorescence, but {110} sector does not. Photoluminescence (PL) emission and excitation spectra at the room temperature are as follows: The PL emission spectrum of the selenite MGW shows bluish green emission peak at approximately 502nm, and the PL emission spectrum of the selenite MGY red emission peak at approximately 670nm. The colors observed with the naked eye and the spectrometer are not equivalent. The excitation spectrum of MGY shows that MGY fluoresces under not only UV light but visible light, and especially it shows the maximum luminescence efficiency under purple light (398nm). The excitation spectrum of MGW shows that MGW fluoresces under not only UV light but visible light as well as MGY, and it shows the maximum luminescence efficiency under blue light (420nm).抄録全体を表示PDF形式でダウンロード (830K)
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