地学雑誌
Online ISSN : 1884-0884
Print ISSN : 0022-135X
総説
冥王代ジルコンの探索
─年代分析過程の迅速化─
堤 之恭沢田 輝磯﨑 行雄
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ジャーナル フリー

2018 年 127 巻 5 号 p. 723-734

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 Zircon is the only candidate of Hadean terrestrial material that can be collected because it can survive physically and chemically, as well as maintain its U–Pb age system during omnigenous geological events. However, Hadean zircons are rare, so many age analyses of zircons are required to isolate Hadean zircon grains. There are two ways to improve the analyses; decrease the time required for pre-analyzing processes and decrease the time required for age analysis. New equipment, high-voltage pulse power fragmentation device and automatic zircon pick-up system are effective for crushing rock sample and separating zircon grains, respectively, in a short time. Another potential age analysis, the 207Pb/206Pb age screening analysis, shows good performance in selecting old zircons quickly. Integrative operation of equipment and methods will result in successfully finding numerous Hadean zircons.

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© 2018 公益社団法人 東京地学協会
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