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  1. B100 理学部/理学研究科
  2. B100b 紀要
  3. The Journal of earth and planetary sciences
  4. 54

Lanthanide tetrad effect of Naegi granite-pegmatite suite, central Japan : Convex tetrad effect by fractional loss of fluid from hydrous felsic melt

https://doi.org/10.18999/joueps.54.13
https://doi.org/10.18999/joueps.54.13
3655be7f-a646-41a8-9b56-9b03787429d3
名前 / ファイル ライセンス アクション
KJ00005455606.pdf KJ00005455606.pdf (1.8 MB)
Item type 紀要論文 / Departmental Bulletin Paper(1)
公開日 2010-03-09
タイトル
タイトル Lanthanide tetrad effect of Naegi granite-pegmatite suite, central Japan : Convex tetrad effect by fractional loss of fluid from hydrous felsic melt
言語 en
著者 TAKAHASHI, Takafumi

× TAKAHASHI, Takafumi

WEKO 33355

en TAKAHASHI, Takafumi

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TANAKA, Kazuya

× TANAKA, Kazuya

WEKO 33356

en TANAKA, Kazuya

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KAWABE, Iwao

× KAWABE, Iwao

WEKO 33357

en KAWABE, Iwao

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
抄録
内容記述 The Late Cretaceous (ca. 67 Ma) Naegi granite-pegmatite suite in Nakatsugawa City, Gifu Prefecture, central Japan, has been studied in view of the lanthanide tetrad effect in evolved felsic rocks. The pegmatite occurring sparsely in the granite body as small patches (<20 cm) and the matrix granite were sampled. REE including Y, major and some minor elements in the samples have been determined. The REE data for mineral separates (quartz, plagioclase, K-feldspar, biotite, and residual heavy minerals) from a granite sample have also been obtained. The chondrite-normalized REE patterns for pegmatite and granite commonly show convex tetrad effects and huge negative Eu anomalies of Eu/Eu^*=0.02-0.004 but no notable Y/Ho fractionation. The whole-rock sample of granite and its mineral separates show similar convex tetrad effects, suggesting the convex tetrad effect in the original magma before crystallization. The granite and pegmatite show no significant differences in major element chemistry and mineralogy except mineral size and texture, but the pegmatite is depleted in Eu, Sr, and Ba relative to the granite. In addition, the pegmatite exhibits a convex tetrad effect and a fairly large negative Eu anomaly, when normalized by the granite. The field occurrence of pegmatite suggests a heterogeneous distribution of aqueous fluid inside of the granitic magma, which is possibly related to the unmixing phenomenon of fluid and silicate melt. Here is proposed a simple model of fractional loss of fluid from hydrous felsic melt. Applying the model to the observed REE fractionation between pegmatite and host granite pairs, REE partition coefficients between aqueous fluid and melt, K_d(REE: fluid/melt), have been evaluated. The logK_d(REE: fluid/melt) values indeed exhibit small concave tetrad effects, positive Eu anomalies, and light REE enrichment trends. Fractional loss of fluid from a hydrous felsic melt system leaves residual silicates in which the small concave tetrad effect and positive Eu anomaly of logKd(REE: fluid/melt) can be exaggerated in reversed manners. As a result, the residual silicates acquire pronounced convex tetrad effects and huge negative Eu anomalies.
言語 en
内容記述タイプ Abstract
内容記述
内容記述 国立情報学研究所で電子化したコンテンツを使用している。
言語 ja
内容記述タイプ Other
出版者
言語 en
出版者 Dept. of Earth and Planetary Sciences, Nagoya University
言語
言語 eng
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/joueps.54.13
ID登録タイプ JaLC
ISSN(print)
収録物識別子タイプ PISSN
収録物識別子 0919-875X
書誌情報 en : The Journal of Earth and Planetary Sciences, Nagoya University

巻 54, p. 13-35, 発行日 2007
フォーマット
application/pdf
著者版フラグ
値 publisher
URI
識別子 http://hdl.handle.net/2237/12873
識別子タイプ HDL
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