キンバーライトからのエコロギットにおける酸素同位体の比率は,キンバーライトからのエコロギットにおける酸素同位体の比率です
Science (New York, N.Y.)
|June 4, 1971
まとめ
ロバーツ・ヴィクター・キンバーライト・エコロギットにおける酸素同位体の変異は,小分結晶化の過程を明らかにする. 初期の結晶の蓄積はより高い酸素18を示し,残留液はより低い値を示し,圧力依存の結晶溶融分割を示している.
科学分野:
- 地質化学 地質化学
- ペトロロジー・ペトロロジーとは
- 同位体地質学とは,同位体地質学である.
背景:
- エクロジット系キセノライトは,地球のマントルのプロセスについての洞察を提供します.
- 酸素同位体組成 (デルタ(18) O) は地質学的過程の敏感なトレーサーである.
研究 の 目的:
- ロバーツ・ビクター・キンバーライト・エコロギットにおける酸素同位体の変動の原因を調査する.
- エクロギット形成における断片結晶化と結晶溶融の分割の役割を理解する.
主な方法:
- エクロジット系キセノリフの酸素同位体組成 (デルタ(18) O) の分析.
- 同位体データと鉱物学的および構造的観測の比較.
主要な成果:
- 酸素イソトープの組成は,標準平均海洋水 (SMOW) に比べて1ミリあたり2〜8の範囲です.
- 変動は,小分結晶化に起因し,初期堆積物ではデルタ値が高く,残留液ではデルタ値が低い.
- 結晶溶融の分断は1ミリあたり3を超えると推定されており,圧力に依存しています.
結論:
- 分割結晶化は,これらのエコロギットにおける酸素同位体シグネチャーを制御する重要なプロセスです.
- 溶けた結晶の分断が増加したのは,溶けた結晶が形成された後に,結晶化前に起こった.
- この発見は,エコロサイトの形成と進化の条件に関する新たな制約を提供する.
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