Using olivine as a probe into early igneous and mantle melting processes: combining in situ oxygen isotopes with minor and trace-element compositions of olivine from Circum-Mediterranean Cenozoic magmatic provinces

使用橄榄石作为早期火成岩和地幔熔融过程的探针：将原位氧同位素与来自环地中海新生代岩浆省的橄榄石的微量和微量元素成分相结合

• 批准号: 283406641
• 负责人: Dr. Dejan Prelevic, Ph.D., since 10/2016
• 金额: --
• 依托单位: Institut für Geowissenschaften
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/283406641?language=en
• 关键词: Using; olivine; probe; into; early

The identity and origin of mantle components tapped by Circum-Mediterranean Cenozoic orogenic and anorogenic magmatism will be evaluated on the basis of comprehensive in situ oxygen isotope combined with in situ major, minor and trace element measurements on genetically different olivine populations (mantle xenocrysts, phenocrysts, cumulitic olivine etc). The in situ isotopic and elemental compositions of the olivines will be determined on identical spots circumventing low-temperature falsification of the genuine composition of the bulk rock by alteration. Moreover, olivine represents an archive of early magmatic processes offering less homogenized account of the melting process compared to lavas. Oxygen isotopes will indicate if a source rock experienced metasomatism and it will signalize derivation from continental (18O enrichment) or altered oceanic crust (variable, but often 18O depletion). In combination with elemental compositions, this approach represents a powerful tool to discriminate and quantify different geochemical components in particular to track recycled crustal components in the source of the Circum-Mediterranean Cenozoic magmatic province. It is expected that the suggested in situ analytical approach applied for the first time on olivine is a breakthrough in olivine research and substantiates the application of olivine as a relevant petrogenetic indicator for early magmatic processes.

将根据综合的原位氧同位素与原位，原位主要的，次要的，次要的和微量的元素测量在遗传上不同的橄榄群（遗传学上不同的橄榄剂）基础上，将评估由周环的造基因造山心和厌恶性岩浆作用的地幔成分的身份和起源。橄榄石的原位同位素和元素组成将根据相同的斑点确定，从而通过改变来规避低温伪造，通过变化对散装岩石的真正组成。此外，橄榄石代表了早期岩浆过程的档案，与熔岩相比，对熔化过程的同质化描述较少。氧同位素将指示源岩石是否经历过交代主义，并且它会从大陆（18o富集）或变化的海洋壳（可变，但通常18o耗尽）发出信号。结合元素组成，这种方法代表了一种强大的工具，可以辨别和量化不同的地球化学成分，尤其是跟踪圆周甲甲状腺酸岩岩的来源中的再生地壳成分。可以预期，建议的原位分析方法首次应用于橄榄石是橄榄石研究的突破，并证实了橄榄石作为早期岩浆过程的相关质发生指标的应用。