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首页> 外文期刊>Contributions to Mineralogy and Petrology >Distribution and petrogenetic behaviour of trace elements in granitic pegmatite quartz from South Norway
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Distribution and petrogenetic behaviour of trace elements in granitic pegmatite quartz from South Norway

机译：挪威南部花岗伟晶岩石英中微量元素的分布和成岩行为

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The present study documents that the trace-element distribution in granitic quartz is highly sensitive to CAFC processes in granitic melts. Igneous quartz efficiently records both the origin and the evolution of the granitic pegmatites. Aluminium, P, Li, Ti, Ge and Na in that order of abundance, comprises >95% of the trace elements. Most samples feature >1 ppm of any of these elements. The remnant 5% includes K, Fe, Be, B, Ba and Sr whereas the other elements are present at concentrations lower than the detection limit. Potassium, Fe, Be and Ti are relatively compatible hence obtain the highest concentrations in early formed quartz. Phosphorous, Ge, Li and Al are relatively incompatible and generally obtain the highest concentrations in quartz that formed at lower temperatures from more evolved granitic melts. The Ge/Ti, the Ge/Be, the P/Ge and the P/Be ratios of quartz are strongly sensitive to the origin and evolution of the granitic melts and similarly the Rb/Sr and the Rb/K ratios of K-feldspars may be utilised in petrogenetic interpretations. However, the quartz trace element ratios are better at distinguishing similarities and differences in the origin and evolution of granitic melts. After evaluating the different trace element ratios, the Ge/Ti ratio appears to be most robust during subsolidus processes in the igneous systems, hence probably should be the preferred ratio for analysing and understanding petrogenetic processes in granitic igneous rocks.
机译：本研究表明，花岗岩石英中的痕量元素分布对花岗岩熔体中的CAFC过程高度敏感。火成石英有效地记录了花岗岩伟晶岩的起源和演化。铝，磷，锂，钛，锗和钠的含量顺序如此丰富，占痕量元素的> 95％。大多数样品中任何这些元素的含量均> 1 ppm。剩余的5％包括K，Fe，Be，B，Ba和Sr，而其他元素的含量低于检测极限。钾，铁，铍和钛是相对相容的，因此在早期形成的石英中可获得最高的浓度。磷，锗，锂和铝相对不相容，通常在较高温度下由更多的花岗岩熔体形成的石英中浓度最高。石英的Ge / Ti，Ge / Be，P / Ge和P / Be比对花岗岩熔体的起源和演化非常敏感，同样，钾长石的Rb / Sr和Rb / K比也很敏感。可以在成岩解释中使用。但是，石英微量元素的比率在区分花岗岩熔体的起源和演化方面具有更好的区别。在评估了不同的微量元素比率之后，在火成岩系统的亚固相过程中，Ge / Ti比率似乎最稳定，因此可能应该是分析和理解花岗岩火成岩中成岩过程的首选比率。

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