澳大利亚东南部地中的Pb同位素地图
J Liebmann1, B Ware2, D R Mole3,4,5
1Timescales of Mineral Systems Group, School of Earth and Planetary Sciences, Curtin University, Perth, WA, 6102, Australia. janne.liebmann@curtin.edu.au.
Scientific data
|November 12, 2024
概括
这项研究介绍了来自澳大利亚东南部的全面的 (Pb) 同位素数据集,揭示了空间变化和地球变化.
科学领域:
- 地质化学 地质化学
- 同位素地质学的同位素.
- 地球科学 地球科学 地球科学
背景情况:
- 同位素在各种科学学科中作为关键的地化学标记物.
- 了解同位素的空间和时间变化对于地质研究至关重要.
- 以前的研究已经强调了同位素在地球科学,考古学和法医科学中的实用性.
研究的目的:
- 介绍来自澳大利亚东南部的新型 (Pb) 同位素数据集.
- 在该地区绘制Pb同位素 (206Pb/204Pb,207Pb/204Pb和208Pb/204Pb) 的空间变异性的地图.
- 提供关于岩源特征, (U) 和 (Th) 分布以及地演变的见解.
主要方法:
- 对来自澳大利亚东南部230万平方公里的232个岩石样本的分析.
- 包括包括U和Th-poor (K-feldspar) 和U和Th-bearing (全岩) 介质的样本.
- 生成同位素地图,详细说明Pb同位素比率,岩源指标 (U/Pb,Th/U) 和模型年龄.
主要成果:
- 一个空间分辨率的Pb同位素数据集,涵盖了超过30亿年的地球历史.
- 详细的同位素地图说明了Pb同位素的可变性及其与U和Th的关系.
- 在地质时间尺度上,放射性内生长影响地Pb组成的证据.
结论:
- 这一数据集提供了地进化和U/Th分布的时间和空间分辨率图像.
- 这种资源对于解开地分化,岩源和矿产沉积物的起源是有价值的.
- 这些发现支持同位素地质化学在理解地球历史方面的广泛应用.
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