IIIA鉄隕石であるプエンテ・デル・ザカテのシリケート含有物
E J Olsen1, A M Davis, R N Clayton
1Department of the Geophysical Sciences, University of Chicago, Chicago, IL 60637, USA.
まとめ
プエンテ・デル・ザカテ隕石のシリケート含有物は,IABの鉄の含有物に似ているが,小惑星の核の形成を示唆している. 酸素同位体は,この含有物を他のIIIAおよびIIIBアイロン,おそらくIIIAB小惑星マントルのアイロンと結びつける.
科学分野:
- * 惑星科学 (惑星科学)
- * 宇宙化学について
- * ミネラロジー
背景:
- *IIIAとIIIBの鉄隕石は小惑星の核から発生したと考えられています.
- * 鉄隕石に含まれるシリケート含有物は,その形成環境についての洞察を与えてくれます.
- * プエンテ・デル・ザカテ隕石には,多様な鉱物学を持つ顕著なシリケート含有が含まれています.
研究 の 目的:
- * プエンテ・デル・ザカテ隕石のシリケート含有物の鉱物学と酸素同位体組成を特徴付けるため.
- * プエンテ・デル・ザカテを含むものを,他の鉄流星群,特にIABで見つかった含有物と比較するために.
- * プエンテ・デル・ザカテが母小惑星に含まれる可能性のある起源と形成位置を決定する.
主な方法:
- * プエンテ・デル・ザカテ隕石のシリケート含有物の石版分析.
- *電子顕微鏡とスペクトル顕微鏡を用いた鉱物学的識別.
- *インクルージョンの鉱物相の酸素同位体分析.
主要な成果:
- * プエンテ・デル・ザカテの含有物はオリヴィン,ピロキセン,プラジオクラゼ,グラフィット,トロイライト,クロミット,ダウブレライト,鉄金属を含む.
- *鉱物組成は,IABの鉄隕石で見つかったインクルージョンと類似しています.
- * 酸素同位体組成は,IIIAおよびIIIB鉄隕石のクロミットおよびリン酸含有物と一致しています.
結論:
- * Puente del Zacateのシリケート含有物は,IABの鉄隕石からの含有物と特徴を共有しています.
- * その酸素同位体シグネチャーは,IIIAとIIIBの鉄隕石の親体と結びつけています.
- * 挿入は,IIIABの親小惑星の下層マントルから発生した可能性が高い.
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