マントルの移行領域における原始的および再利用されたヘリウム同位体シグネチャー
S Timmerman1, M Honda2, A D Burnham2
1Research School of Earth Sciences, Australian National University, 142 Mills Road, Acton, ACT 2601, Australia. suzette.timmerman@anu.edu.au.
まとめ
深層マントルのヘリウム同位体シグネチャーは 超深層のダイヤモンドで測定されました ヘリウム-3/ヘリウム-4の濃度の低い深層マントルの源は,移行地帯に浸透し,玄武岩の組成に影響を与えます.
科学分野:
- 地化学
- 地理学
- ペトロロジー
背景:
- バサルトの同位体組成は 地球の内部の化学貯蔵庫を明らかにします
- 深層マントルのヘリウムイソトープの直接測定は難しい.
- 深いマントルのヘリウムを理解することは 噴火した玄武岩のシグネチャーを解釈するのに不可欠です
研究 の 目的:
- ヘリウム (He),ストロンチウム (Sr),鉛 (Pb) の同位体比を超深層のダイヤモンド液体インクルージョンで測定する.
- 深層マントルのヘリウム同位体シグネチャーを調査する
- 海の島のイソトープの多様性の起源を理解する.
主な方法:
- 移行地帯 (深さ410660 km) に由来するダイヤモンドからの流体インクルージョンにおけるHe-Sr-Pb同位体の比率の分析.
- 超深層のダイヤモンドを 原始的なサンプルとして使って 脱ガスや地殻汚染の影響を受けない
主要な成果:
- 極端なHe-C-Pb-Sr同位体の変動が観察されました.
- 3He/4Heの高い比率は,ヘリウム濃度の上昇と相関している.
- 3ヘリウムと4ヘリウムが少ない 深いマントルの存在を示した
結論:
- 3He/4Heの高い深層マントルの源が 移行地帯に浸透している.
- この深層の源とリサイクルされた物質の相互作用によって 異質多様性が生まれます
- このプロセスは,海洋島の玄武岩で発見された多様な同位体組成を説明します.
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