氧化石质层地幔在黄金动员中的作用
Kun-Feng Qiu1, Rolf L Romer2, Zheng-Yu Long1
1Frontiers Science Center for Deep-time Digital Earth, State Key Laboratory of Geological Processes and Mineral Resources, School of Earth Sciences and Resources, China University of Geosciences, Beijing, China.
Science advances
|October 11, 2024
概括
克拉顿中的黄金矿物化与地幔转化有关. 同位素分析揭示了地幔中的碳酸盐转基因对调动黄金至关重要,控制巨大的黄金沉积物形成.
科学领域:
- 地质化学 地质化学
- 经济地质学 地质学
- 同位素地球化学 同位素地球化学
背景情况:
- 罗时期的金矿在克拉顿边缘形成,与岩层地幔的转化有关,由地材料形成.
- 岩石沉积在黄金 (Au) 转移和地幔氧化中起作用,促进了Au的调动到化物中.
- 由于缺乏直接的地球化学证据,挥发性物质在地幔黄金调动中的具体作用仍然不清楚.
研究的目的:
- 为了研究在中国东部北方巨中黄金 (Au) 的地幔来源,这是一个有大量中生代黄金矿藏的地区.
- 通过使用地化学标记物,建立地幔过程和覆盖地的黄金矿化之间的遗传联系.
- 为了澄清地幔化和氧化在控制黄金调动中的作用.
主要方法:
- 在大量的灯中分析 (Li) 同位素.
- 在中国东部北方克拉顿下方的岩层地幔的特征.
- 地质化学研究地幔-地相互作用和黄金 (Au) 运输.
主要成果:
- 同位素数据表明,石灰岩地幔中的碳酸盐转化和覆盖地中的黄金 (Au) 矿化之间存在着强烈的遗传联系.
- 在地幔中预先缩黄金 (Au) 对于巨型黄金省的形成至关重要.
- 石质层地幔的氧化被确定为控制黄金 (Au) 调动的关键因素.
结论:
- 石灰岩地幔中的碳酸盐转基体是orogenic黄金沉积物的起源的一个关键因素.
- 地幔氧化状态显著影响从地幔到地的黄金 (Au) 运输效率.
- 了解地幔的过程,包括化和氧化,对于探索和发现新的黄金省份至关重要.
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