孤児ストロンチウム-87はアビサール・ペリドータイト:パパは花岩だった
まとめ
ペリドータイトにおける高いストロンチウム同位体比は"孤児"のストロンチウム-87成分を示唆する. このコンポーネントは,破片を運ぶ低温の海水の浸透によるもので,マントル内の放射性崩壊によるものではない.
科学分野:
- 地質化学 地質化学
- 同位体地質学とは,同位体地質学である.
- 海洋学 海洋学とは
背景:
- アビサールやアルプスのペリドータイトにおけるストロンチウムイソトープの比率の上昇 (87) Sr/ (86) Sr は,マントルと海水の単純な混合によって予想される比率を超えています.
- 放射性母体から分離したと思われる余分な,または"孤児" (87) Sr の存在は,しばしば分析エラーに起因する.
研究 の 目的:
- "孤児" (87) のSrの起源と位置をペリドライトサンプルで調査する.
- 放射性ストロンチウムが海洋地殻に浸透するメカニズムを決定する.
主な方法:
- 大量のアビサールとアルプスのペリドート岩のサンプルを分析した.
- オリヴィンとエンスタチットに特化したペリドータイト変異産物の顕微鏡および化学的検査.
- 特定された成分におけるストロンチウムの同位体分析.
主要な成果:
- "孤児" (87) Sr成分は,オリヴィンとエンスタタイトの変異産物の中に,アビッサル・ペリドタイトで局所されている.
- 証拠によると,低温 (<200°C) の海水浸透による導入が示唆されています.
- 大陸産の粘土を含む関連するデトリタル粒子は,高度に放射性である.
結論:
- "オルファン" (87) ペリドータイトのSrは分析的な人工物ではなく,海水による変化の結果である.
- 放射性デトリタル物質を運ぶ低温の海水浸透が,この過剰なストロンチウムの主要な源である.
- "孤児" (87) Srのような放射性同位体は,低温の海水が海洋地殻に浸透する際の貴重なトレーサーとして役立つ.
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