...
首页> 外文期刊>Contributions to Mineralogy and Petrology >Disturbance versus preservation of U-Th-Pb ages in monazite during fluid-rock interaction: textural, chemical and isotopic in situ study in microgranites (Velay Dome, France)
【24h】

Disturbance versus preservation of U-Th-Pb ages in monazite during fluid-rock interaction: textural, chemical and isotopic in situ study in microgranites (Velay Dome, France)

机译:独居石在流体-岩石相互作用过程中的扰动与U-Th-Pb年龄的保留:微花岗岩的质地,化学和同位素原位研究(法国Velay Dome)

获取原文
获取原文并翻译 | 示例
           

摘要

Monazite is extensively used to date crustal processes and is usually considered to be resistant to diffusive Pb loss. Nevertheless, fluid-assisted recrystallisation is known to be capable of resetting the monazite chronometer. This study focuses on chemical and isotopic disturbances in monazite grains from two microgranite intrusions in the French Central Massif (Charron and Montasset). Petrologic data and oxygen isotopes suggest that both intrusions have interacted with alkali-bearing hydrothermal-magmatic fluids. In the Charron intrusion, regardless of their textural location, monazite grains are sub-euhedral and cover a large domain of compositions. U-Pb chronometers yield a lower intercept age of 297 ± 4 Ma. An inherited component at 320 Ma is responsible for the scattering of the U-Th-Pb ages.
机译:独居石被广泛用于约会地壳过程,通常被认为可以抵抗扩散的Pb损失。然而,已知流体辅助重结晶能够使独居石天文台复位。这项研究的重点是法国中部断层地带(Charron和Montasset)的两次微花岗岩侵入对独居石晶粒的化学和同位素扰动。岩石学数据和氧同位素表明,这两次侵入均与含碱热液岩浆流体相互作用。在Charron侵入体中,独居石颗粒无论其质地在哪里,都是近半面体的,并且覆盖了大范围的成分。 U-Pb天文钟的截距年龄较低,为297±4 Ma。 U-Th-Pb年龄的散射是由320 Ma的遗传成分引起的。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号