巻号一覧
8 巻 (1974)
- 4 号 p. 157-
- 3 号 p. 109-
- 2 号 p. 47-
- 1 号 p. 1-
8 巻, 2 号
選択された号の論文の7件中1～7を表示しています
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Tsuyoshi Tanaka1974 年 8 巻 2 号 p. 47-60
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーFour gabbros, two diabases and one basalt from a volcanic suite in Japan were analyzed for ten rare earth elements, Ba and Sr. The rare earth patterns normalized against the Leedey chondrite are of solid-type. Europium anomalies, both positive and negative, are found to be correlative with normative anorthite. These chemical features of the volcanic suite have some resemblance to those of abyssal basalts and gabbros. The REE partition coefficients which had prevailed during the formation of source materials of these basic rocks were estimated from these REE data. It can be concluded that (1) the source materials may have been solid-type mantle which was separated from less fractionated liquid-type (rectilinear REE pattern) magma compared with chondrite, and that (2) both groups of gabbros and basalts were derived from different parts of the mantle which had been formed in the cource of sequential magmatic processes at a certain stage of the earth's history.抄録全体を表示PDF形式でダウンロード (6556K) -
Amalendra Nath Chowdhury, Baldev Krishna Handa, Ajit Kumar Das1974 年 8 巻 2 号 p. 61-65
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーHigh values for lithium, rubidium and cesium contents have been observed by the authors in some samples from thermal spring area in Puga valley, Kashmir, India. Samples studied are (1) water from thermal springs, (2) sediments deposited at the thermal springs, (3) samples from borax deposits from the near vicinity of the thermal springs. Estimation of Li, Rb and Cs was carried out by atomic absorption method. In the borax samples separate determinations were carried out by complete decomposition of the samples as also by extraction with water. In the thermal spring water, the average rare alkali content was 5.9 ppm Li, 0.9 ppm Rb and 10.5 ppm Cs. In the spring deposits the maximum contents of rare alkalies observed were 565 ppm Li, 240ppm Rb, 3, 530ppm Cs. There are variations from sample to sample. In the borax deposits the maximum values are 4, 500ppm Li, 350ppm Rb, 2, 150ppm Cs. Difference between the total and water soluble alkali metals shows increased absorption of Rb and Cs in the argillaceous impurities. Geochemical aspects leading to the strong enrichment of rare alkalies, specially Cs, have been discussed. Association of late stage magmatic activity has been suggested for the origin of thermal springs and associated deposits.抄録全体を表示PDF形式でダウンロード (2580K) -
Noboru Nakamura1974 年 8 巻 2 号 p. 67-74
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーBased on accurate determinations of REE abundances in chondrites, fine structures of REE patterns for lunar materials were reviewed. It was found that highland basalts represented by the Apollo 14 samples and KREEP, and certain samples taken from mare regions, which have “straight” REE patterns, showed positive Ce anomalies (several to ten per cent, relative to the Leedey chondrite). On the other hand, the mare basalts which have “curved” REE patterns exhibit no or little anomaly of Ce. In addition, the Ce abundances of Apollo 16 anorthosites are normal viewed from the smooth curve spanning from La to Nd and Sm. These features are considered to be of much significance for the history of the lunar materials.抄録全体を表示PDF形式でダウンロード (3970K) -
Masahiro Yamamoto1974 年 8 巻 2 号 p. 75-86
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーSulfide samples (mostly chalcopyrite with some sphalerite and bornite) from the Ryusei vein of the Akenobe mine exhibit a narrow spread in δ34S value ranging from -4.4 to -0.4‰. The range is lower than those of other Japanese sulfide deposits so far studied. The frequency diagram of δ34S values for chalcopyrite indicates that the δ34S distribution is bimodal; one peak at -3.0 to -2.5‰ and the other at -1.5 to -0.5 ‰. This suggests that chalcopyrite in the Ryusei vein was formed in at least two different stages of mineralization. Of 9 sphalerite-chalcopyrite pairs studied (including 2 pairs from different veins), 8 pairs are isotopically in disequilibrium; sphalerite is up to 2.7 ‰ lighter than coexisting chalcopyrite. From the isotopic and chemical equilibrium relationship between the aqueous and mineral species of the Cu-Fe-S-O system, δ34S values of the ore-forming solutions were speculated to be rather similar to those of chalcopyrite (0∼-5 ‰).抄録全体を表示PDF形式でダウンロード (5993K) -
Bokuichiro Takano, Kunihiko Watanuki1974 年 8 巻 2 号 p. 87-95
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーPb/Ba ratios of barite from various origins (hot springs, banks in the Japan Sea and Kuroko-type or vein-type ore mines) vary from 10-5 to 10-1. When they are plotted against chloride concentrations of the barite-precipitating solutions, both expressed in logarithms, the ratios increase almost linearly with a decrease in those of the solutions. For their chloride concentrations except those of hot spring waters, NaCl-equivalent salinities of fluid inclusions in the barite were used as an approximation. This fact is possibly elucidated in terms of chloro-complexing of lead in thermal solutions.抄録全体を表示PDF形式でダウンロード (4202K) -
Ryoshi Ishiwatari1974 年 8 巻 2 号 p. 97-102
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリーESR study of humic acids from lake and marine sediments was performed to obtain information on their aromatic structure. The g values of humic acids were found to be 2.0032∼2.0035. It seems likely that free radicals in them are semiquinone radicals in a condensed ring system having alicyclic rings or radicals of carbon and nitrogen in the molecule.抄録全体を表示PDF形式でダウンロード (2828K) -
Yukihiro Matsuhisa1974 年 8 巻 2 号 p. 103-107
発行日: 1974年
公開日: 2008/04/08
ジャーナル フリー18O/16O ratios were determined for NBS-28 and four other silicate reference samples using BrF5 method. The analytical error is ±0.1‰. The results agree well with those by previous workers, except for NBS-28. The δ18O value of NBS-28 in the present work is +9.5‰ relative to SMOW, which is 0.5‰ lower than the value reported by FRIEDMAN and GLEASON (1973). The discrepancy appears to have been caused mainly by the difference in the methods employed for the determination of SMOW scale.抄録全体を表示PDF形式でダウンロード (2444K)
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