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ID 48307
本文ファイル
別タイトル
U-Pb zircon dating using Nd-YAG (213 nm) Laser ablation-ICP-MS, and evaluating the consistency with SHRIMP dating
著者
勝部 亜矢
早坂 康隆 大学院理学研究科 広大研究者総覧
坂口 綾
キーワード
LA-ICP-MS
detrital zircon age dating
Nd-YAG
SHRIMP
抄録(英)
Laser ablation–inductively coupled plasma-mass spectrometry (LA-ICP-MS) is a powerful tool for rapid and precise U-Pb zircon age dating. Here, we report U-Pb ages for detrital zircons determined using 213 nm Nd-YAG LA-ICP-MS analysis, and compare these results with those determined using a sensitive high-resolution ion microprobe (SHRIMP) to evaluate approaches for detrital zircon age dating during provenance analysis. Consistency of the system was assessed by measuring four well-characterized standard zircon samples (Plešovice, SL13, AS3, QGNG), with weighted mean measured 206Pb/238U and 207Pb/206Pb ages of the samples only slightly offset from the reference ages and with acceptable MSWD values, barring the 207Pb/206Pb age of the Plešovice zircon, which had a low 207Pb signal intensity. Detrital zircon grains were re-measured by LA-ICP-MS to assess consistency between the LA and SHRIMP systems, with 207Pb/206Pb ages for zircons older than 1000 Ma in excellent agreement with SHRIMP ages; typical offsets were between −3.9% and 0.3%. In addition, zircons younger than 1000 Ma had more accurate 206Pb/238U than 207Pb/206Pb ages. Both LA-ICP-MS and SHRIMP techniques produce results that are in excellent agreement, barring a few analyses that were affected by zircon heterogeneity or zoning.
内容記述
本研究の経費に,日本学術振興会特別研究員奨励費(課題番号 : 23-7273)および同科学研究費補助金基礎研究(c) (No. 20540445)の一部を使用した.
掲載誌名
地質学雑誌
118巻
11号
開始ページ
762
終了ページ
767
出版年月日
2012-11-15
出版者
日本地質学会
ISSN
0016-7630
1349-9963
NCID
出版者DOI
言語
日本語
NII資源タイプ
学術雑誌論文
広大資料タイプ
学術雑誌論文
DCMIタイプ
text
フォーマット
application/pdf
著者版フラグ
publisher
権利情報
© The Geological Society of Japan 2012
関連情報URL
部局名
理学研究科