Insights into the structural evolution of the pre-Variscan rocks of the Eastern Pyrenees from La Molina quartz veins; constraints on chlorite and fluid inclusion thermometry

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2020-11-26 DOI:10.1344/geologicaacta2020.18.18
Eloy González-Esvertit, À. Canals, J. Casas, F. Nieto
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引用次数: 1

Abstract

Quartz veins hosted in the infra and overlying series to the (Sardic) Upper Ordovician Unconformity provide new insights into the structural and thermal evolution of the pre-Variscan rocks of the Eastern Pyrenees. In the La Molina area (Canigó massif), two generations of metric quartz veins (V1 and V2) are distinguished by their distribution patterns and their relationships to the deformational macro, meso, and microstructures. P-T formation conditions are obtained by combining chlorite geothermometry and fluid inclusion microthermometry data. Discrepancy on formation temperature for chlorites located at different positions within the veins are discussed, concluding that veins grew in a low fluid/rock ratio regime. V1 veins can be related to the Late Ordovician syn-sedimentary faulting episode as revealed by their distribution patterns, formation mechanisms, and fluid-rock interactions. We propose an Alpine age for the V2 veins, based on their structure and the emplacement conditions of 318 ± 12°C and 2.4 ± 0.2kbar, with an estimated geothermal gradient of 34°C∙km-1 and a burial depth of ca. 9km. Results obtained here are compared with other quartz veins spread throughout the Paleozoic basement of the Eastern Pyrenees.
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La Molina石英脉对东比利牛斯山脉前瓦里西坎期岩石构造演化的启示绿泥石和流体包裹体测温的限制
位于(萨迪克)上奥陶统不整合面的下覆系列中的石英脉为东比利牛斯山脉前华力西期岩石的结构和热演化提供了新的见解。在La Molina地区(Canigómassif),两代公制石英脉(V1和V2)的分布模式及其与变形宏观、细观和微观结构的关系是不同的。结合绿泥石地热测量和流体包裹体微温测量数据,得到了P-T的形成条件。讨论了位于矿脉内不同位置的绿泥石的形成温度差异,得出的结论是,矿脉生长在低流体/岩石比例的区域。V1脉的分布模式、形成机制和流体-岩石相互作用揭示了其与晚奥陶世同沉积断裂事件有关。根据V2矿脉的结构和318±12°C和2.4±0.2kbar的侵位条件,我们提出了V2矿脉的阿尔卑斯年龄,估计地热梯度为34°C∙km-1,埋深约9km。这里获得的结果与分布在东比利牛斯山脉古生代基底的其他石英脉进行了比较。
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来源期刊
Geologica Acta
Geologica Acta 地学-地质学
CiteScore
2.50
自引率
6.70%
发文量
13
审稿时长
>12 weeks
期刊介绍: - Relevant conceptual developments in any area of the Earth Sciences. - Studies presenting regional synthesis. - Thematic issues or monographic volumes presenting the results from one or more research groups. - Short papers reflecting interesting results or works in progress. - Contributions and results from Research Projects, Workshops, Symposiums, Congresses and any relevant scientific activity related to Earth Sciences. - Geologica Acta aims to stimulate rapid diffusion of results and efficient exchange of ideas between the widespread communities of Earth Science researchers (with special emphasis on Latinamerica, the Caribbean, Europe, the Mediterranean
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