炭酸溶液によって形成されたクレートンの縁の硫化物豊富な大陸の根
Chunfei Chen1, Michael W Förster2,3, Svyatoslav S Shcheka2
1State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences, China University of Geosciences, Wuhan, China. chfchen2016@hotmail.com.
Nature
|January 8, 2025
まとめ
炭酸性溶液は,深い大陸の根に硫黄を集約し,金属鉱石形成に不可欠な硫化物豊富なゾーンを形成します. この研究は,これらのプロセスが,鉱物探査を支援し,クレートンの縁を豊かにすることを明らかにしています.
科学分野:
- 地化学
- 経済地質学
- ペトロロジー
背景:
- クラトンの地殻には金属 (金,銅,希土) が豊富に存在する.
- 底辺の石化層は 炭素や硫黄や水といった 揮発性物質に富んでいます
- これらの揮発性物質の分布と金属濃縮における役割は,まだ十分に研究されていない.
研究 の 目的:
- カラトンの石層マントルの硫黄と銅の分布を調査する.
- 炭酸溶融の金属生成における役割を決定する.
- 金属の濃縮と硫化物豊富な根の形成を説明してください.
主な方法:
- 硫黄と銅に関する全地球規模のクレートニク・ペリドートデータ
- 高圧実験用炭酸ガスの溶解物
- 融解の進化と揮発性溶解性の分析
主要な成果:
- 硫化物と銅が豊富な大陸の根は,クレートンの縁の近くで160〜190kmの深さで確認されています.
- 炭酸シリケート溶液は炭酸石に進化し,クラトンの縁に集中する.
- 溶けたSiO2の減少は硫黄の降水を引き起こし,硫化物豊富な根を形成します.
結論:
- 炭酸溶液は硫黄を濃縮し,深いマントルの硫化物貯蔵庫を形成する上で重要な役割を果たします.
- 融解の移動は,金属堆積物と炭酸塩がクレートンの縁の近くにあることを説明します.
- この発見は 金属鉱石の鉱床探査の新たな枠組みを提供している.
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