气候变化领域集成服务门户(CCPortal): Permian–Triassic red-stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface

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DOI	10.1007/s00531-019-01764-0
	Permian–Triassic red-stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface
	Fàbrega C.; Parcerisa D.; Thiry M.; Franke C.; Gurenko A.; Gòmez-Gras D.; Solé J.; Travé A.
发表日期	2019
ISSN	14373254
起始页码	2325
结束页码	2347
卷号	108 期号:7
英文摘要	Extensive areas of the Variscan granitic basement in NE Spain display profiles of red-stained albitized facies characterized by albitization of Ca-plagioclase, chloritization of biotite and microclinization of orthoclase, along with the alteration of igneous quartz to secondary CL-dark quartz. These profiles have a geopetal structure beneath the Triassic unconformity, with a very intense and pervasive alteration in the upper part that progressively decreases with depth to 150–200 m where the alteration is restricted to the walls of fractures. The red albitized facies contains secondary maghemite and hematite that indicate oxidizing conditions. Dating of microclinized orthoclase and secondary monazite that have formed in the red-stained albitized facies yielded K–Ar and U–Th–Pbtotal ages of 240 and 250 Ma, respectively, suggesting that the alteration developed during the Permian–Triassic period. The geopetal disposition of the red albitized profile with respect to the Triassic unconformity, its large regional extent, and the fracture-controlled alteration in the lower part of the profile indicate groundwater interaction. The δ18O values of albitized plagioclase (+ 11‰), microclinized orthoclase (+ 13‰), and secondary CL-dark quartz (+ 12‰) suggest that the alteration temperature was about 55 °C. This “low” temperature suggests that the alteration occurred during interaction of the granitic rocks with Na-rich fluids below a surficial weathering mantle on the Permian–Triassic palaeosurface. The latter is possibly related to Triassic evaporitic environments in long-lasting, stable landscapes in which Na-rich solutions infiltrated deep regional groundwaters. © 2019, Geologische Vereinigung e.V. (GV).
英文关键词	Albitization; Alteration; Dating; Isotope; Palaeosurface; Permian–Triassic; Red stained
语种	英语
scopus关键词	albitization; basement rock; chemical alteration; chemical weathering; dating method; granite; groundwater; isotopic analysis; paleosurface; Permian-Triassic boundary; Spain
来源期刊	International Journal of Earth Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/147777
作者单位	Departament d’Enginyeria Minera, Industrial i TIC, Escola Politècnica Superior d’Enginyeria de Manresa (UPC Campus Manresa), Av. Bases de Manresa, 61-73, Manresa, 08242, Spain; MINES ParisTech, PSL Research University, Center of Geosciences, 35 rue St. Honoré, Fontainebleau, Cedex, 77305, France; Centre de Recherches Pétrographiques et Géochimiques, UMR 7358, Université de Lorraine, 15 rue Notre-Dame des Pauvres, BP 20, Vandoeuvre-lès-Nancy, 54501, France; Departament de Geologia, Edifici C, Universitat Autònoma de Barcelona, Bellaterra, 08193, Spain; Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, México, DF 04510, Mexico; Laboratorio Nacional de Geoquímica y Mineralogía, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, México, DF 04510, Mexico; Departament de Geoquímica, Petrologia i Prospecció Geològica, Facultat de Geologia, Universitat de Barcelona, Zona Universitària de Pedralbes, Barcelona, 08028, Spain
推荐引用方式 GB/T 7714	Fàbrega C.,Parcerisa D.,Thiry M.,等. Permian–Triassic red-stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface[J],2019,108(7).
APA	Fàbrega C..,Parcerisa D..,Thiry M..,Franke C..,Gurenko A..,...&Travé A..(2019).Permian–Triassic red-stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface.International Journal of Earth Sciences,108(7).
MLA	Fàbrega C.,et al."Permian–Triassic red-stained albitized profiles in the granitic basement of NE Spain: evidence for deep alteration related to the Triassic palaeosurface".International Journal of Earth Sciences 108.7(2019).