古老的景观演变通过宇宙基的在detrital石中追踪到的
Maximilian Dröllner1,2, Milo Barham1, Christopher L Kirkland1
1Timescales of Mineral Systems Group, Curtin Frontier Institute for Geoscience Solutions, School of Earth and Planetary Sciences, Curtin University, Perth, WA 6845, Australia.
概括
在石中稳定的宇宙基晶体揭示了澳大利亚的纪景观演变. 这种方法重建了古代的脱皮率和沉积物运输动态,为地质时间的景观变化提供了新的见解.
科学领域:
- 地质形态学和四季科学
- 同位素地球化学 同位素地球化学
- 沉积地质学 沉积地质学
背景情况:
- 宇宙原核化物对于量化景观过程,如侵蚀和暴露至关重要.
- 以前的方法在延长景观演变研究的时间范围方面存在局限性.
- 微粒是地质年代学和地化学分析的宝贵矿物.
研究的目的:
- 为了扩大宇宙原核应用的时间极限,在detrital中使用稳定的宇宙原.
- 通过钻井核心数据重建澳大利亚南部的纪景观演变.
- 为了研究古老景观中古化率和沉积物运输动态.
主要方法:
- 在detrital中整合稳定的宇宙基 (Kr) 测量与U-Pb地质年代学.
- 从澳大利亚南部的伊欧纪黄金矿床钻孔芯的分析.
- 从宇宙的Kr度计算古染率和明显暴露时间.
主要成果:
- 的U-Pb年龄表明,从一个约80万公里的内陆通过一个约1000公里的沿海漂流系统的古排水.
- 宇宙78的Kr度表明古染率低 (0.30.7 m/My),可能由于再暴露而被低估.
- 显而易见的暴露时间范围为0.9至210万年 (My),表明从长时间的沉积物储存转向更动态的运输模式.
结论:
- 在石中稳定的宇宙基提供了一种新的方法来重建长期的景观演变.
- 这项研究揭示了纪期间沉积物动态的转变,受到欧斯塔斯和构造因素的影响.
- 这种方法增强了我们对古代景观和沉积物记录的共同演变的理解.
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