巻号一覧
31 巻 (1997)
- 4 号 p. 193-
- 3 号 p. 133-
- 2 号 p. 69-
- 1 号 p. 1-
31 巻, 4 号
選択された号の論文の5件中1～5を表示しています
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企画総説「地球化学の新方法」
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奈良岡 浩, 山田 桂太, 松本 公平, 石渡 良志1997 年 31 巻 4 号 p. 193-210
発行日: 1997/12/10
公開日: 2016/12/22
ジャーナル フリーCompound-specific isotope analysis has been developed recently using gas chromatography/combustion/mass spectrometry (GC/C/IRMS). This paper summarizes principles and progress of GC/C/IRMS, and reviews recent some important works using this new method. GC/C/IRMS is a novel tool for (i) biomarker analysis in sediments and living matter, (ii) paleoenvironment analysis including reconstruction of ancient biogeochemical processes, (iii) geochemical cycle study of organic compounds in a terrestrial-marine system, (iv) evaluation of maturity and diagenesis of organic matter including petroleum formation, (v) ecological analysis, (vi) evaluation of anthropologenic pollution in environment, (vii) detection of extraterrestrial organic compounds and the formation mechanism study, (viii) tracer studies in environment.抄録全体を表示PDF形式でダウンロード (1712K)
柴田賞受賞記念論文
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北野 康1997 年 31 巻 4 号 p. 211-226
発行日: 1997/12/10
公開日: 2016/12/22
ジャーナル フリーThe major component of carbonate materials distributing in the earth's environment is calcium carbonate. Calcium carbonate has interesting characteristics, that is, it has three different crystal forms such as calcite, vaterite and aragonite. Thus, the distribution of minor chemical species between parent solution and calcium carbonate precipitate is delicate but interesting. Since the influences of various cations, anions and organic materials dissolved in a parent solution on the polymorphic crystallization and the distribution of minor elements were clarified by the present author, the synthesis of (Ca, Mg) CO3 at low temperatures and pressures was first succeeded. It is also important that the amount of carbonate materials existing in the earth is very large and the greatest reservoir of carbon dioxide is carbonate materials. The present author estimated the sedimentation rate of marine carbonate through the geochemical balance of calcium ions after the careful examination on water-rock interaction on continent. He has tried to discuss the birth and evolution of air and sea through the discussion on those of carbon dioxide. Also the role of carbonate sedimentation in the sea on global warming has been clarified.抄録全体を表示PDF形式でダウンロード (1597K)
報文
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友寄 喜貴, 棚原 朗, 武村 盛久, 渡口 輝, 平良 初男1997 年 31 巻 4 号 p. 227-233
発行日: 1997/12/10
公開日: 2016/12/22
ジャーナル フリーThe activities of natural radionuclides, 238U, 234U, 226Ra, 228Ra, 222Rn, 210Pb and 210Po in ground waters collected from Okinawa Island were measured. The 234U/238U activity ratios in most samples showed more or less unity, whereas, relatively high values of 2.0-4.0 were obtained in samples from Motobu area. 222Rn activities in the ground waters were much higher than the other uranium series nuclides. The 222Rn/226Ra activity ratios ranged from 3000 to 29000, and those for 210Po/210Pb were from 0.08 to 0.82. On the whole, activities of the nuclides in the ground waters at the studied points showed higher in the order of 222Rn≫210Pb>234U>238U>226Ra>210Po. In addition to α_recoil dissolution, the selective absorption and/or desorption by some organic or inorganic substances in the aquifer may be happening.抄録全体を表示PDF形式でダウンロード (757K) -
永峰 康一郎, 関 圭司, 前田 憲一郎, 吉岡 勝広, 池辺 幸正1997 年 31 巻 4 号 p. 235-243
発行日: 1997/12/10
公開日: 2016/12/22
ジャーナル フリーSulfur and nitrogen oxides in acid precipitation were observed at Nagoya and Matsue by collecting rainwater in each rainfall. The observation results using trajectory analysis show that these oxides mainly came from urban area at Nagoya, and their mass did not change much with season and the route of trajectories. In contrast, sulfur oxide mainly came from biological origin rather than urban one at Matsue inferred from nssδ34S data, and its mass increased in winter. The seasonal and trajectorical variation in nssSO42-/NO3- ratio and nssδ34S implies that the contribution of continental and/or maritime biogenic sulfur to sulfur oxide in acid precipitation increased in winter at Matsue due to the seasonal wind.抄録全体を表示PDF形式でダウンロード (773K)
博士論文抄録
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南 雅代1997 年 31 巻 4 号 p. 244-
発行日: 1997/12/10
公開日: 2016/12/22
ジャーナル フリーPDF形式でダウンロード (153K)
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