Peña do Seo 花岗岩（西班牙莱昂西阿斯图里亚斯-莱昂区）的岩石学和地球化学模型（Ba-W-Sn）

Q4 Earth and Planetary Sciences

Geogaceta Pub Date : 2023-12-18 DOI:10.55407/geogaceta98144

Pablo Caldevilla Domínguez, L. González-Menéndez, Alba Lozano, F. Gómez‐Fernández, A. M. Castañón

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引用次数: 0

摘要

Cadafresnas 花岗岩和花岗岩角砾岩（位于莱昂西部的 Peña do Seo）是与钨锑矿化有关的瓦利斯坎时代的小型后构造岩群。根据其矿物地球化学特征，它们被归类为富含石英的花岗岩-闪长岩、花岗闪长岩和花岗岩碎屑岩，成分为过铝/金属。根据铷-钡-锶的关系，可以确定花岗岩的来源为玄武岩，花岗岩角砾岩的来源为玄武岩。利用地球化学模型（部分熔融），研究了这些来源对解释花岗岩和花岗岩角砾岩中钡、钨和锡含量的贡献。结果表明，这些岩性的部分熔融解释了所研究岩石中这些元素的部分含量，需要额外的分块结晶和/或热液注入过程。

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Petrology and geochemical modeling (Ba-W-Sn) of the Peña do Seo granitoids (West Asturian-Leonese Zone, León, Spain)

The Cadafresnas granites and granitoid breccias (Peña do Seo, W of León) are small post-tectonic stocks of Variscan age related to W-Sn mineralizations. According to their mineralogical geochemical characteristics, they are classified as granites-syenogranites, granodiorites and granitoids rich in quartz, of peraluminous/metaluminous composition. The Rb-Ba-Sr relationships allow assigning a metapelitic source for the granites and a metagreywacke source for the granitoid breccias. Using geochemical modeling (partial melting), the contribution of these sources to explain the Ba, W and Sn contents of the granites and granite breccias is investigated. The results indicate that the partial melting of these lithologies explains part of the content of these elements in the studied rocks, requiring additional processes of fractional crystallization and/or hydrothermal injections.

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Geogaceta Earth and Planetary Sciences-Geology

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0.40

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期刊介绍： Geogaceta is a magazine that publishes semiannually the Geological Society of Spain. This society aims to promote, promote, and disseminate knowledge, progress and applications of Geology; , the advice in scientific and educational matters to the institutions and entities that require it and the representation of the scientific interests of the geological community of Spain at international level. Its members have the right to participate in all the activities organized by the Company, to present their candidacy to any of their management positions and to receive free periodical publications of the Company (Geogaceta and Magazine of the Geological Society of Spain).