伊比利亚东北部富Variscan岩石圈:Les Guilleries碰撞后二叠纪钙碱性煌斑岩脉资料

IF 1.3 4区 地球科学 Q2 GEOLOGY Geologica Acta Pub Date : 2021-12-07 DOI:10.1344/geologicaacta2021.19.15
Esteban Mellado, M. Corbella, Didac Navarro, Andrew R. C. Kylander
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引用次数: 0

摘要

伊比利亚东北部加泰罗尼亚海岸山脉Les Guilleries地块古生代变质基底和晚variscan岩体的碰撞后基性岩脉横切。基性斑晶为主,斑状结构,角闪孔丰富,MgO和挥发物含量高,并伴有类地壳微量元素模式,表明其为钙碱性煌斑岩,以花斑岩为主。它们在LILE、HFSE和REE中的富集和初始Sr-Nd同位素组成(87Sr/86Sri在0.70851 ~ 0.71127之间,epsilon Ndi在-5.23 ~ -4.63之间)与富集的次大陆岩石圈地幔源相一致。基体钛矿的U-Pb年龄为262±7Ma,符合横切关系。岩浆作用表现为煌斑岩强烈的绿岩化和钠长岩化,Na2O对SiO2、K2O、CaO、Ba、Rb、Cs、Pb、Sr、Tl和Zn的系统变化,可能还有f的消失。地球化学和年代学数据支持造山带地球化学亲和力,符合Variscan压缩/压迫和碰撞后拉伸/伸展之间的过渡构造制度。与盘古大陆的破碎和岩石圈的变薄有关。研究的煌斑岩脉可以代表Variscan造山岩浆活动的最年轻脉冲,因此标志着它在广义三叠纪伸展开始之前结束于伊比利亚东北部。
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The enriched Variscan lithosphere of NE Iberia: data from postcollisional Permian calc-alkaline lamprophyre dykes of Les Guilleries
Post-collisional mafic dykes crosscut the Paleozoic metamorphic basement and late-Variscan plutons in Les Guilleries massif (Catalan Coastal Ranges, NE Iberia). The predominance of mafic phenocrysts, porphyritic texture, abundant amphibole, high MgO and volatile content, together with crustal-like trace-element patterns indicate that the dykes correspond to calc-alkaline lamprophyres, mainly spessartites. Their enrichment in LILE, HFSE and REE and initial Sr-Nd isotopic compositions (87Sr/86Sri between 0.70851 and 0.71127, epsilon Ndi between -5.23 and -4.63) are consistent with an enriched subcontinental lithospheric mantle source. U-Pb ages of matrix titanite crystals yield concordia ages of 262±7Ma, congruent with crosscutting relationships. Postmagmatic processes are evidenced by intense chloritization and albitization of the lamprophyres, together with systematic variations of Na2O vs SiO2, K2O, CaO, Ba, Rb, Cs, Pb, Sr, Tl, and Zn, and possibly the removal of F. The geochemical and geochronological data support an orogenic geochemical affinity, in accordance with the transitional tectonic regime between Variscan compression/transpression and post-collisional transtension/extension, related to the fragmentation of Pangea and thinning of the lithosphere. The lamprophyre dykes studied could represent the youngest pulse of Variscan orogenic magmatism and, therefore, mark its end in NE Iberia before the onset of the generalized Triassic extension.
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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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