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12. 東北日本背弧側に産する鮮新統明神岩層の安山岩類の成因 : ＡＦＣプロセス ; 主要・微量元素組成およびSr・Nd同位体組成からの制約

Author

Kondo, Hiromi, Shuto, Kenji, and Fukase, Masayuki

Subjects
Pliocene, andesite, Sr and Nd isotopes, AFC process, Northeast Japan, back-arc volcanism
Abstract

Andesitic rocks, of the Pliocene Myojin-iwa volcanic field, in the northern part of Niigata Prefecture, Northeast Japan, show transitional chemical characteristics between typical calc-alkaline and tholeiitic series. The most primitive basaltic andesite among these andesitic rocks (the Myojin-iwa Formation) has geochemical characteristics similar to those of other Pliocene-Quaternary basaltic rocks from the back-arc side of the NE Japan, and has initial Sr isotope ratio slightly higher than those of the latter basaltic rocks. Andesites from the Myojin-iwa area show SiO_2 contents ranging from 53.3% to 62.8, and initial Sr and Nd isotope ratios vary from 0.70324 to 0.70378 and 0.512791 to 0.512926, respectively. The initial Sr isotope ratios display positive correlation with SiO_2, and their initial Nd isotope ratios gradually decrease with increasing SiO_2. This suggests that the genesis of andesites from the area can not be attributed to simple fractional crystallization of the primary basaltic magma, but to an assimilation and fractional crystallization (AFC) process. Based on petrographical evidence, major and trace element compositions and Sr-Nd isotope systematics, the Paleogene granitoid rocks constituting the upper crust beneath the Myojin-iwa and surrounding areas are the possible candidates for assimilants. An AFC model using the granitoid rocks as the assimilant can successfully reproduce the chemical variations of the andesites from the Myojin-iwa Formation by assuming the γ values (ratio of the rate of assimilation to the rate of fractional crystallization) of less than 0.2., 東北日本の背弧側（新潟県北部）には,鮮新世（約3Ma）の主に安山岩質の溶岩および火砕岩からなる明神岩層が分布する.これら安山岩類の斑晶鉱物組み合わせ,斑晶鉱物の化学組成,全岩の主要・微量元素組成などの特徴は,安山岩の組成変化の主な要因が,斑晶鉱物の分別にあることを示唆している.しかし,安山岩類のSrI値はSiO_2量の増加とともに高くなり,NdI値は逆にSiO_2量の増加とともに低くなる傾向を示す.このことは,これらの安山岩類は玄武岩質マグマからの単純な分別結晶作用によって形成されたものではないことを示している.これらのことから,明神岩層の周辺に分布する漸新世の花崗岩質岩石と先第三系堆積岩（これらは新潟地域の上部地殻の主な構成岩である）の同化作用の影響について検討した.その結果,安山岩類の化学組成および同位体組成の変化は,玄武岩質マグマが花崗岩質岩石を同化しながら分別結晶作用したことによって説明されることが明らかにされた.

Published
2000

13. Rb, Sr, Sm and Nd separation from rocks, minerals and natural water using ion-exchange resin

Author

Hamamoto, Takuji, Yuhara, Masaki, Miyazaki, Takashi, Fukase, Masayuki, Kondo, Hiroko, Ikawa, Toshiyuki, Ishioka, Jun, Kagami, Hiroo, and Shuto, kenji

Subjects
inorganic chemicals, separation, Sm, Nd, respiratory system, blank value, Rb, Sr, respiratory tract diseases, ion-exchange resin
Abstract

Rb, Sr and REE (Rare Earth Elements) from rock and mineral powder and natural water were separated by ion-exchange resin with hydrochloric acid (first column separation) as eluent. Sm and Nd were then separated using α-hydroxy isobutyric acid (HIBA) adjusted to pH = 4.5 (second column separation) from that REE fraction. Blanks of Rb, Sr, Sm and Nd in HCl were 0.006 ppb, 0.002 ppb, 0.001 ppb and 0.004 ppb, respectively but those for refined water (used) were 0.002 ppb, 0.0004 ppb, 0.001 ppb and 0.003 ppb. Blanks for Rb, Sr, Sm and Nd during whole procedure were 0.03-0.54 ng, 0.11-0.91 ng, 0.03-0.07 ng and 0.21-0.39 ng.

Published
2000

15. Primary Colonic Cancer in Association with Schistosomiasis Japonica : A Case Report

Author

Suzuki, Satoshi, Saitoh, Hiroshi, Shimizu, Takao, Iinuma, Yasushi, Mishina, Takeshi, Suzuki, Nobuo, Fukase, Masayuki, Sekikawa, Hiroo, and Hatakeyama, Katsuyoshi

Subjects
primary colon cancer, adenocarcinoma, parasitic diseases, tumor promoter, food and beverages, Schistosoma japonicum
Abstract

An 82-year-old Japanese man with a cecal cancer and a history of Schistosoma japonicum (S. japonicum) infestation underwent ileocecal resection. In the resected specimen many heavily calcified eggs of S. japonicum were seen, distributed mainly in the submucosa adjacent to the tumor. Schistosomiasis due to S. japonicum is one of many possible contributors to the development of colorectal cancer. In this case, the 50 years between the patient's acquisition of S. japonicum and presentation with cancer may reflect unrelated spontaneous carcinogenesis, but the fact that the eggs were heavily and extensively present in the resected specimen argues for a relationship between these eggs and the cancer. Coordinating treatment for schistosomiasis with systemic follow-up to detect cancer probably would be required to establish S. japonicum eggs as a cancer promoter, the infestation of which presumably contributes to the cellular changes leading to premalignant transformation of intestinal epithelial cells.

Published
1997

20. An AFC (assimilation and fractional crystallization) process as the petrogenesis of andesites from the Pliocene Myojin-iwa Formation, the back-arc side of the Northeast Japan : combined major-and trace-element and Sr-Nd isotope constraints

Author

Kondo, Hiromi, Shuto, Kenji, Fukase, Masayuki, 近藤, 裕美, 周藤, 賢治, 深瀬, 雅幸, Kondo, Hiromi, Shuto, Kenji, Fukase, Masayuki, 近藤, 裕美, 周藤, 賢治, and 深瀬, 雅幸

Abstract

Andesitic rocks, of the Pliocene Myojin-iwa volcanic field, in the northern part of Niigata Prefecture, Northeast Japan, show transitional chemical characteristics between typical calc-alkaline and tholeiitic series. The most primitive basaltic andesite among these andesitic rocks (the Myojin-iwa Formation) has geochemical characteristics similar to those of other Pliocene-Quaternary basaltic rocks from the back-arc side of the NE Japan, and has initial Sr isotope ratio slightly higher than those of the latter basaltic rocks. Andesites from the Myojin-iwa area show SiO_2 contents ranging from 53.3% to 62.8, and initial Sr and Nd isotope ratios vary from 0.70324 to 0.70378 and 0.512791 to 0.512926, respectively. The initial Sr isotope ratios display positive correlation with SiO_2, and their initial Nd isotope ratios gradually decrease with increasing SiO_2. This suggests that the genesis of andesites from the area can not be attributed to simple fractional crystallization of the primary basaltic magma, but to an assimilation and fractional crystallization (AFC) process. Based on petrographical evidence, major and trace element compositions and Sr-Nd isotope systematics, the Paleogene granitoid rocks constituting the upper crust beneath the Myojin-iwa and surrounding areas are the possible candidates for assimilants. An AFC model using the granitoid rocks as the assimilant can successfully reproduce the chemical variations of the andesites from the Myojin-iwa Formation by assuming the γ values (ratio of the rate of assimilation to the rate of fractional crystallization) of less than 0.2., 東北日本の背弧側（新潟県北部）には,鮮新世（約3Ma）の主に安山岩質の溶岩および火砕岩からなる明神岩層が分布する.これら安山岩類の斑晶鉱物組み合わせ,斑晶鉱物の化学組成,全岩の主要・微量元素組成などの特徴は,安山岩の組成変化の主な要因が,斑晶鉱物の分別にあることを示唆している.しかし,安山岩類のSrI値はSiO_2量の増加とともに高くなり,NdI値は逆にSiO_2量の増加とともに低くなる傾向を示す.このことは,これらの安山岩類は玄武岩質マグマからの単純な分別結晶作用によって形成されたものではないことを示している.これらのことから,明神岩層の周辺に分布する漸新世の花崗岩質岩石と先第三系堆積岩（これらは新潟地域の上部地殻の主な構成岩である）の同化作用の影響について検討した.その結果,安山岩類の化学組成および同位体組成の変化は,玄武岩質マグマが花崗岩質岩石を同化しながら分別結晶作用したことによって説明されることが明らかにされた.

Published
2000

21. 男鹿半島、漸新統門前層中部の火山岩類の岩石学

Author

深瀬, 雅幸, 周藤, 賢治, Fukase, Masayuki, Shuto, Kenji, 深瀬, 雅幸, 周藤, 賢治, Fukase, Masayuki, and Shuto, Kenji

Abstract

Oligocene volcanic rocks from the middle part of the Monzen Formation in the Oga Peninsula, northeastern Japan consist of lava flows and pyroclastic rocks. These volcanics are composed of basalts and andesites which can be divided into four groups based on differences in their TiO_2 contents and petrographic characteristics；high TiO_2 basalt group (HTG), low TiO_2 basalt and andesite group (LTG), quartz bearing medium TiO_2 andesite group (MTG) and porphyritic andesite group (PTG). Olivine basalts of the HTG have geochemical characteristics similar to those of basaltic rocks from continental rift zone, whereas other basalts of the HTG and LTG have characteristics of both continental rift zone basalts and of island arc basalts. These compositional differences of basaltic rocks can be attributed mainly to differences in the geochemical characteristics of their source mantle. The variations in HFS (high field strength) element contents among olivine basalts in the HTG may have resulted from either differences in degree of partial melting of source mantle or differences in degree of fractional crystallization mainly of clinopyroxene from the primary basaltic magma. Andesitic rocks from the study area are characterized by the wide variations in Zr/Nb ratio and initial ^143Nd/^144Nd ratio (Nd I value), suggesting that the production of these andesitic rocks were affected by assimilation of crustal materials with low Zr/Nb ratio and low ^143Nd/^144Nd ratio. The accidental materials such as granitic fragments, quartz crystals having corroded form and phenocrystic plagioclases having core part with very low An% are contained in the MTG and LTG andesites. These features indicate that granitic rocks probably constituting wall rocks around the magma chamber are the candidate for the assimilants., 男鹿半島西部地域に分布する漸新統門前層中部の火山岩類について，岩石学的検討を行った．門前層中部の火山岩類は，9タイプの斑晶鉱物組み合わせをもつ玄武岩～安山岩からなる．これらの火山岩類をTiO_2含有量と記載岩石学的特徴の違いに基づいて4つの岩石グループに区分した．玄武岩にはリフト帯に産する玄武岩と類似する微量元素比をもつものと，リフト帯と島弧の玄武岩の中間的な性質をもつものがある．これらの性質の違いは，Nd同位体比の検討から起源マントルの違いを反映したものと考えられる．安山岩には花崗岩質の岩片，これに由来するとみられる融食した石英とAn組成の著しく低い斜長石などが含まれることや，安山岩は幅広いNdI値とZr/Nb比を有することから，安山岩の形成には，これらの値と比の低い花崗岩質岩石の同化作用の関与があったことを論じた．

Published
2000

34. A Case of Glycogen Storage Disease Type III (Glycogen Debranching Enzyme Deficiency) with Liver Cirrhosis and Hypertrophic Cardiomyopathy.

Author

KOBAYASHI, AKIRA, primary, NISHINOMIYA, FUJIHIKO, additional, FUKAMACHI, YUHZOU, additional, OHTAKA, MASAHIRO, additional, YAMAMOTO, JOHTA, additional, TAKAGI, KOHTARO, additional, TANAKA, SHINICHI, additional, TAKIZAWA, SABURO, additional, IMADACHI, HAJIME, additional, FUKASE, MASAYUKI, additional, SHIMIZU, YUKITOSHI, additional, and HAYASAKA, KIYOSHI, additional

Published
1995
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42. Kanzo

Author

FUJITA, Toshio, primary, ITOH, Hiroshi, additional, TAJIKA, Sadakatsu, additional, HOKARI, Ichiro, additional, KUSHIBUCHI, Tohichi, additional, KIRIYAMA, Seiichi, additional, FUMOTO, Kohhei, additional, ABE, Yohichi, additional, FUJIMAKI, Masao, additional, and FUKASE, Masayuki, additional

Published
1982
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46. A CASE OF ECTOPIC GONADOTROPIN PRODUCING CHOLANGIOMA

Author

TANAKA, Takashi, primary, YAMADA, Yukio, additional, KUMAGAI, Kazuo, additional, IMAIZUMI, Shinsaku, additional, ITO, Masaki, additional, KURIBAYASHI, Kazutoshi, additional, SASAKI, Hideo, additional, SUZUKI, Toshimitsu, additional, FUKASE, Masayuki, additional, ONISHI, Yoshihisa, additional, HIROI, Masahiko, additional, and NUNOKAWA, Osamu, additional

Published
1973
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47. Successful surgical treatment of angiosarcoma of the spine: a case report.

Author

Kawashima H, Ishikawa S, Fukase M, Ogose A, and Hotta T

Subjects
Antineoplastic Combined Chemotherapy Protocols therapeutic use, Back Pain etiology, Bone Screws, Bone Substitutes therapeutic use, Calcium Compounds, Ceramics, Chemotherapy, Adjuvant, Combined Modality Therapy, Cyclophosphamide administration & dosage, Doxorubicin administration & dosage, Durapatite, Etoposide administration & dosage, Follow-Up Studies, Hemangiosarcoma complications, Hemangiosarcoma drug therapy, Humans, Hypesthesia etiology, Ifosfamide administration & dosage, Internal Fixators, Male, Middle Aged, Osteolysis etiology, Prostheses and Implants, Prosthesis Implantation, Remission Induction, Silicates, Spinal Cord Compression etiology, Spinal Neoplasms complications, Spinal Neoplasms drug therapy, Hemangiosarcoma surgery, Spinal Neoplasms surgery, Thoracic Vertebrae surgery
Abstract

Study Design: Case report., Objectives: To report primary angiosarcoma of the T8 vertebra, which was successfully managed with en bloc spondylectomy and postoperative chemotherapy., Summary of Background Data: To the best of our knowledge, the present case is the first documented example of successful treatment of angiosarcoma of the spine., Methods: Angiosarcoma of the eighth thoracic vertebra was diagnosed in a 48-year-old man with impending neurologic deficit. Imaging findings revealed a nonspecific high-grade lesion. A total spondylectomy of T8 by en bloc resection was performed. The defect of the vertebral body was reconstructed with a apatite-wollastonite glass ceramic prosthesis; moreover, the T6-T10 vertebrae were instrumented by the pedicle screw, hook and rod system. The histologic diagnosis of the excised specimen was high-grade angiosarcoma. Postoperative chemotherapy was implemented to prevent local recurrence and distant metastasis., Results: No sign of local recurrence or metastasis was evident 5 years after surgery., Conclusion: This case is the first documented example of successful treatment of angiosarcoma of the thoracic spine. Radiologic findings were nonspecific; consequently, correct diagnosis was established by pathologic examination. Immediate, aggressive operative treatment and postoperative adjuvant chemotherapy afforded a satisfactory outcome.

Published
2004

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