名古屋大学博物館報告

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名古屋大学博物館報告 第29号

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• 箱�ｱ 真隆（HAKOZAKI Masataka）・中村 俊夫（NAKAMURA Toshio）
  年輪年代法による輸入スプルース材の年代決定と産地推定
  Tree-ring dating and dendroprovenancing of the imported Spruce woods
  vol.29, p. 1-11.   » 要旨を表示 PDF（3.02MB）
  DOI: 10.18999/bulnum.029.01

  In order to obtain the teaching materials for dendrochronology workshop, wood identification, tree-ring dating and dendroprovenancing survey on imported spruce woods were carried out. As a result of identification based on wood anatomical features, the species was identified as Picea sitchensis (Bong.) Carrière (sitka spruce). A tree-ring chronology with code name AKNCCH01 (it covers AD1689-1990 from 15 woods) was obtained as a result of dendrochronological analysis. AKNCCH01 was compared with chronologies of the southeastern Alaska coastal area and yielded t_BP > 6.5. In particular, correlation between AKNCCH01 and chronology of the Prince of Wales Island showed a very high value of t_BP = 9.36. The above results suggest that these imported sitka spruce woods have grown at the southeastern Alaska Pacific coastal area, from the end of 17th century to the present.

  年輪年代法体験学習の教材を得るため，アラスカ州から輸入されたスプルース材の樹種同定と年代決定および産地推定を行なった．木材解剖学的特徴に基づく同定の結果，樹種はシトカスプルースに同定された．年輪年代解析の結果，15試料からAD1689-1990にわたる302年間の標準年輪曲線（AKNCCH01と命名) が得られた．AKNCCH01は，アラスカ南東部沿岸地域の標準年輪曲線とtBP > 6.5を示し，特にプリンスオブウェールズ島のものとtBP = 9.36という非常に高い値を示した．以上の結果は，これらの輸入スプルース材が，アラスカ南東部太平洋沿岸諸島で，17 世紀末〜現代にかけて生育したシトカスプルースであることを示唆する．

• 冨山慎二（TOMIYAMA Shinji）・加藤ともみ（KATOH Tomomi）・坂田　健（SAKATA Ken）・田中　剛（TANAKA Tsuyoshi）
  基礎セミナーの素材としての名古屋大学キャンパス内の放射線量
  Turning the topic of radioactivity in the Nagoya University Campus to an instructive material for the First Year Seminar
  vol.29, p. 13-22.   » 要旨を表示 PDF（3.67MB）
  DOI: 10.18999/bulnum.029.02

  We experienced a severe accident at the Fukushima Daiichi Nuclear Power Plant in March 2011. We have understood now that we need to keep alert on radiation exposure in daily life. Knowledge and basic experience on radioactivity must be included in a fundamental curriculum of general education in universities. As a part of the First Year Seminar at Nagoya University, we and the students intended to measure and learn dose of natural radiation from various sources in our common environments. In this paper, we report the radiation exposure of examinee in their hometown as well as radiation dose measured in and around the Higashiyama Campus of the university. We expect the students to remember their experiences and the approximate amount of exposed dose in daily life.

• 永井ひろ美（NAGAI Hiromi）・白木　敬一 （SHIRAKI Keiichi）
  大村一蔵（1910）に見る放散虫化石
  Radiolarian Fossils Mentioned in OMURA Ichizo (1910)
  vol.29, p. 23-32.   » 要旨を表示 PDF（4.11MB）
  DOI: 10.18999/bulnum.029.03

  In June 1910, OMURA Ichizo submitted his dissertation thesis entitled “Report on the Geology of Shiretoko, Sakhalin and Brief Description of Crystalline Schist of Sakhalin” for the Geological Institute of the University of Tokyo. In this thesis he made a detailed description on geology and geography of the Shiretoko Peninsula at the southeastern end of Sakhalin. He discovered well preserved radiolarian fossils from radiolarite in the “Paleozoic” system near Butchino, identified them as Cenosphaera gregaria, C. pachyderma, Heliodiscus sp., Theocapsa elongata, Lithocampe exaltata, Stichocapsa perpasta, and S. grandis; and depicted their fairly detailed figures. These radiolarian fossils were considered to be of Paleozoic, compared with those of the Paleozoic systems in mainland Japan. Recently the Paleozoic system of the Shiretoko Peninsula is recognized as a Cretaceous accretionary complex. The radioralian fossils recovered from Shiretoko by Omura should be assigned to the Middle Jurassic to the Lower Cretaceous species by the morphological characters.

• 水谷伸治郎（MIZUTANI Shinjiro）
  放散虫化石の研究史からみた美濃帯の地質
  The Mino Terrane in the Japanese Islands viewed from the radiolarian biostratigraphy
  vol.29, p. 33-52.   » 要旨を表示 PDF（914KB）
  DOI: 10.18999/bulnum.029.04

  This paper describes the outline of study of the Mino Terrane, central Japan, principally from the radiolarian biostratigraphic viewpoint. Activiites of the cooperative researches related to my study such as IGCP-115 (the siliceous deposits of the circum-Pacific region), IGCP-171 (the circum-Pacific Jurassic), IGCP-224 (Pre-Cretaceous terranes of Japan), Circum Pacific Terrane Conferences, are also reported. After the plate tectonic discussions on the orogenic belts were presented, we were going to discuss the Alaskan geology.
  I have met Prof. Pessagno in 1967 at the special meeting of IGCP-114 held at Menlo Park, California, and he taught me the fundamental knowledge and techniques on radiolarian paleontoloty at University of Texas at Dallas in 1968. After leaving USA, I started the extensive study of Radiolaria with my colleagues at Nagoya. The first paper reporting the finding of Jurassic radiolarians in the so-called “Paleozoic” areas in central Japan was described by a student (M. Sakai) in 1979. The results of these studies in the Mino area was orally reported to Prof. Emeritus Teiichi Kobayashi, who strongly recommended me to write the result and to publish it on the Proceedings of the Japan Academy (Mizutani et al., 1981a).
  Jones et al. (1977; 1980) and Coney et al. (1980) pointed out the importance of the tectonostratigraphic terrane as exemplified in the geology of West Canada and Alaska. The Wrangellia terrane, the Chulitna terrane, and the Angayuchan terrane are the examples of the terrane in west North America. We have a special meeting in Japan called the Oji Seminar in 1981 as an activity of DELP (Dynamics and Evolution of Lithosphere Project), where we organized the Circum-Pacific Terrane Conference, which was held thereafter at Sydney in Austraia, and at Nanjing in China, and so on.
  In Japan, IGCP-224 organized by Prof. K. Ichikawa to restudy the geology of the Japanese Islands based on the radiolarian biostratigraphy, and we published the report entitled the Pre- Cretaceous terranes of Japan.
  As for the Japanese Islands, Miyashiro (1967) published his idea on the geology of the Japanese Islands based on various aspects of earth sciences such as i) the fundamental knowledge of metamorphic petrology, ii) the thermodynamic of Al₂SiO₃ (sillimanite, alulsite and cyanite), iii) classification of metamorphic facies and facies-series, iv) finding two contrasting metamorphism of high-T/low-P and low-T/high-P ones, v) combining the data of deep seismic zone under the Japanese Islands, vi) distribution of Cenozoic volcanoes, vii) geophysical data of whole Japanses Islands, and viii) topological properties of islands and trenches and trough, collaborated with Sugimura and Uyeda, which were really a beautifully summarized to understand the geological history of our islands. On the other hand, the concept of Heterogen, or the heterogeneous aggregate of the craton and orogenic belts in East Asia, of Kobayashi (1953, 1957) has been approved by the Asian geologists, which may be treated from the collage-tectonic point of view. Outline of history of the study on the Japanese Islands suggests the new and global trend to understand their geological history. As was discussed at the DELP meeting in Japan, the studies of geolgic age determination have been stressed to be much more promoted for all the earth scientists, and they gave us additional data for the study of the intra- and inter-terrane relation. As was treated on the basis of the biostratigraphy of the geologic history, we can extend our discussion to the geohistory on the basis of the choronostratigraphy even if there are plutonic and metamorphic rocks and Precambrian rocks.
  It will be discussed on the basis of the P-T-t-path of the old terranes in the Japanese Islands. The complexity of mélange terrane, or ophiolite terrane will be disucussed in detail by biostratigraphically and choronostratigraphically.
  In this report I describe the short history of academic exchange program between Nagoya Universiy of Japan and Nanjing University of China, which have been performed under the leadership of the governmental policy of China and also under program of circum-Pacific terrane project. In fact, the geology of the Nadanhata terrane in the Heilongjian Province in northeast Chinaa has many traits in common with the Mino Terrane in Japan. I published a paper in Nagoya Journal of Philosophy (Mizutani, 2013) on the revolution of science, and I reviewed the paper here, too. Brief history of our studies of the radiolarians in the Mino terrne and in Japan is described here on a basis of many reports published in these fifty years.

• 吉野奈津子（YOSHINO Natsuko）
  名古屋大学博物館野外観察園展示室の展示記録  2012年10月から2013年10月まで
  Record of the exhibition at the Nagoya University Museum Botanical Garden from October, 2012 to October, 2013
  vol.29, p. 53-58. PDF（2.71MB）
  DOI: 10.18999/bulnum.029.05
• 西田佐知子（NISHIDA Sachiko）・松本葉留奈（ MATSUMOTO Haruna）
  第25回名古屋大学博物館企画展記録  なんじゃ？もんじゃ？〜��木典雄とコケの世界〜
  “Nanja-monja” - Prof. Norio Takaki and His Mosses
  vol.29, p. 59-66. PDF（1.54MB）
  DOI: 10.18999/bulnum.029.06
• 西田佐知子（NISHIDA Sachiko）・堀田慎一郎（HOTTA Shinichiro）・松下佐知子（MATSUSHITA Sachiko）
  第28回名古屋大学博物館企画展記録  「氷壁」を越えて─ナイロンザイル事件と石岡繁雄の生涯─
  Did the nylon rope brake? Life of Shigeo Ishioka and his fight for safety
  vol.29, p. 67-76. PDF（4.59MB）
  DOI: 10.18999/bulnum.029.07