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  1. F300 宇宙地球環境研究所
  2. F300b 紀要
  3. 名古屋大学加速器質量分析計業績報告書
  4. 22

極東ネパールヒマラヤ優白質花崗岩の高精度CHIMEモナザイト年代(予報)

https://doi.org/10.18999/sumrua.22.55
https://doi.org/10.18999/sumrua.22.55
8cffd62c-2aee-4106-bfcc-51656fb57314
名前 / ファイル ライセンス アクション
imayama2010.pdf imayama2010.pdf (1.8 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2012-06-05
タイトル
タイトル 極東ネパールヒマラヤ優白質花崗岩の高精度CHIMEモナザイト年代(予報)
言語 ja
その他のタイトル
その他のタイトル High-precision CHIME monazite age from leucogranites in far-eastern Nepal Himalaya (forecast)
言語 en
著者 今山, 武志

× 今山, 武志

WEKO 83196

ja 今山, 武志

Search repository
鈴木, 和博

× 鈴木, 和博

WEKO 83197

ja 鈴木, 和博

Search repository
Imayama, Takeshi

× Imayama, Takeshi

WEKO 83198

en Imayama, Takeshi

Search repository
Suzuki, Kazuhiro

× Suzuki, Kazuhiro

WEKO 83199

en Suzuki, Kazuhiro

Search repository
アクセス権
アクセス権 open access
アクセス権URI http://purl.org/coar/access_right/c_abf2
キーワード
主題Scheme Other
主題 Chemical age
キーワード
主題Scheme Other
主題 Monazite
キーワード
主題Scheme Other
主題 Himalaya leucogranite
抄録
内容記述 Monazites, approximately [(LREE,Th,U,Ca)(p,Si)O4], from two leucogranite samples in far-eastern Nepal Himalaya were dated by the chemical U-Th-total Pb isochron method (CHIME). Monazites in foliated biotite leucogranite exhibit significant chemical characteristics by different grains or within individual grains. Some monazite grains have strongly undergone the chemical alteration through the monazite-huttonite substitution (p^5+ +REE^3+ ↔Si^4+ + Th^4+). Other grains, especially surrounding feldspars, have slightly occurred the monazite-cheralite substitution (2REE3+ ↔ Ca^2+ +Th^4+), and have the relatively higher concentrations of ThO2, compared to the huttonite-rich monazite. Furthermore, a significant intra-crystal chemical zoning is observed in individual monazite grains, indicating that Y content decreases from core and to rim. Monazites selected using chemical criteria (0.95 < (Ca + Si)/ (Th + U +Pb +S) < 1.05), which could be discriminate the metamict monazite due to the destruction of the crystalline structure from the original monazites, construct together a pseudo-isochron of 16.4 ± 1.7 Ma in PbO-ThO2* diagram. Also, monazites from quartz-rich leucogranite have homogenous compositions of Y, Th and U contents, and yields the weight mean chemical ages of 16.6 ± 2.6 Ma, in agreement with the age of the foliated biotite leucogranite. Our data suggest that the CHIME ages combined with the chemical zoning patterns such as Y, Th, U, Ca, and Pb of monazites can provide a powerful tool to elucidate the complex zoning patterns of monazite and to know the precise timing of granite crystallization from magmatic monazite.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 第23回名古屋大学年代測定総合研究センターシンポジウム平成22(2010)年度報告
言語 ja
内容記述タイプ Other
出版者
言語 ja
出版者 名古屋大学年代測定資料研究センター
言語
言語 jpn
資源タイプ
資源 http://purl.org/coar/resource_type/c_6501
タイプ departmental bulletin paper
出版タイプ
出版タイプ VoR
出版タイプResource http://purl.org/coar/version/c_970fb48d4fbd8a85
ID登録
ID登録 10.18999/sumrua.22.55
ID登録タイプ JaLC
書誌情報 ja : 名古屋大学加速器質量分析計業績報告書

巻 22, p. 55-64, 発行日 2011-03
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