カボ・オルテガル複合体の異質な上層マントルの証拠,スペイン
まとめ
スペインの上部マントルの断面は,ハルツブルギットの中に厚いピロクセニート層を明らかにしています. この層は原始的なマグマプロセスを示唆し,マントルの岩石形成の洞察を提供している.
科学分野:
- 地質学 地質学 地質学
- ペトロロジー・ペトロロジーとは
- ミネラロジーは,鉱物学です.
背景:
- スペインのカボ・オルテガル・コンプレックスは,地球の上層マントルの重要な断片を保存しています.
- この地質学的なセクションは,ハルツブルギットによって特徴付けられ,かなりの量のピロクセニットを保持しています.
- ピロクセナイトは,厚さ300メートル,長さ3キロメートルの明確な層を形成します.
研究 の 目的:
- ハルツブルギット内のピロクセニット層の起源と形成過程を調査する.
- 層の性質とそのマントルの条件下におけるマグマ活動との関係を理解する.
主な方法:
- カボ・オルテガル複合体の詳細な地質地図と構造分析.
- 鉱物の組成と質感を特定するために岩石サンプルをペトログラフィック分析.
- 磁石と地質学の歴史を推論するために,フィールドと地質学データの解釈.
主要な成果:
- ピロクセニト層は,交互に交差する超マフ岩から構成されており,主に巨大なウェブステライトとクリノピロクセニト,軽微なダニットがある.
- 観察された層は,識別可能なリズムパターンが欠けている.
- 証拠によると,この層構造の一部は,原始的なマグマプロセスから生じたことを示唆しています.
結論:
- ピロキセナイトの層は,おそらく堤防内のマグマの侵入と結晶化によるものです.
- これらのマグマ現象は上層マントルの条件下で発生し,宿主であるペリドートに侵入した.
- この発見は,異質な上層マントルの断面の複雑な石化過程を理解するのに寄与する.
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