石炭-密西西比系地球化学特征及成因;比利时那慕尔-迪南特盆地的vissaman膨润土:瓦里斯坎火山来源的证据

IF 1.2 4区 地球科学 Q2 GEOLOGY
Michael A. Pointon, D. Chew, B. Delcambre, G. Sevastopulo
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引用次数: 8

摘要

1. 在比利时Namur-Dinant盆地(NDB),几个与密西西比(Visean)灰岩互层的富粘土层根据其横向连续性、粘土矿物学和重矿物组合被解释为成岩蚀变火山灰层(例如Thorez & Pirlet, 1979;Delcambre, 1989,1996)。虽然这些粘土层的几个方面已经得到了详细的研究,但它们的原始(未改变的)火山组成和源火山的位置并没有得到很好的限制。蚀变火山岩(如膨润土和托斯坦岩)的全岩石地球化学已被用于其他几项研究,以获得有关原始(未蚀变)火山灰层的成分和最终产生它们的岩浆的信息(例如Spears & Kanaris-Sotiriou, 1979;Merriman & Roberts, 1990;Huff et al., 1993;Christidis et al., 1995)。通常用于分类新鲜或轻微蚀变的火山岩的主要元素,在分类广泛蚀变的火山岩时用处有限,因为已知有几种元素,包括K和Na,在风化和成岩作用期间是可移动的(Winchester & Floyd, 1977;Floyd & Winchester, 1978;Zielinski, 1982;Christidis, 1998)。蚀变火山岩的分类依赖于微量元素,包括Ti、高场强元素Hf、Nb、Ta、Zr和稀土元素,这些元素通常被认为在大多数u期是不动的
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Geochemistry and origin of Carboniferous (Mississippian; Viséan) bentonites in the Namur-Dinant Basin, Belgium: evidence for a Variscan volcanic source
1. Introduction Several clay-rich horizons interbedded with Mississippian (Visean) limestones in the Namur-Dinant Basin (NDB), Belgium, are interpreted to be diagenetically altered volcanic ash layers based on their lateral continuity, clay mineralogy and heavy mineral assemblages (e.g. Thorez & Pirlet, 1979; Delcambre, 1989, 1996). Whilst several aspects of these clay horizons have been studied in detail, their original (unaltered) volcanic composition and the location(s) of the source volcanoes are not well constrained. The whole-rock geochemistry of altered volcanic rocks such as bentonites and tonsteins has been employed in several other studies to gain information about the composition of the original (unaltered) ash layers and ultimately the magma from which they were derived (e.g. Spears & Kanaris-Sotiriou, 1979; Merriman & Roberts, 1990; Huff et al., 1993; Christidis et al., 1995). The major elements, which are routinely used to classify fresh or slightly altered volcanic rocks, are of limited use when classifying extensively altered volcanic rocks because several elements, including K and Na, are known to be mobile during weathering and diagenesis (Winchester & Floyd, 1977; Floyd & Winchester, 1978; Zielinski, 1982; Christidis, 1998). Instead, the classification of altered volcanic rocks relies on trace elements including Ti, the high-field-strength elements (HFSE) Hf, Nb, Ta, Zr and the rare-earth elements, which are generally considered to be immobile during most u
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来源期刊
Geologica Belgica
Geologica Belgica 地学-地质学
CiteScore
4.70
自引率
27.80%
发文量
8
审稿时长
>12 weeks
期刊介绍: Geologica Belgica is a Belgian journal that welcomes papers concerning all aspects of the earth sciences, with a particular emphasis on the regional geology of Belgium, North West Europe and central Africa. Papers not dedicated to the geology of Belgium, North West Europe and central Africa are only accepted when one of the authors is linked to a Belgian University or Institution. Thematic issues are highly appreciated. In this case, guest editors take in charge the selection of the manuscripts and the subject of the papers can be enlarged. The journal is in open access. Submitted manuscripts should be concise, presenting material not previously published. The journal also encourages the publication of papers from Belgian junior authors. Short letters are accepted. Papers written in English are preferred. Each mansucript will be reviewed by at least two reviewers.
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