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DOI	10.1016/j.earscirev.2018.12.014
	Petrographic classification of sand and sandstone
	Garzanti, Eduardo
通讯作者	Garzanti, Eduardo
来源期刊	EARTH-SCIENCE REVIEWS
ISSN	0012-8252
EISSN	1872-6828
出版年	2019
卷号	192 页码:545-563
英文摘要	Petrographic classifications of sand and sandstone proposed more than half a century ago are still in use, although they were formulated at a time when depositional and post-depositional sedimentary processes were poorly understood, and before the relationships between tectonics and sedimentation could be interpreted in modern plate-tectonic terms. As a consequence, too many scientific articles and technical reports are still encumbered with obsolete concepts, graphical tools, and ambiguous terminology that make sediment descriptions awkward and misleading. A renovation that treasures the legacy of the pioneers is required. The descriptive petrographic classification of sand and sandstone proposed in this paper is based on the quasi-universally used Gazzi-Dickinson point-counting method, and simply translates into words ternary compositions of quartz, feldspar, and lithic fragments without introducing any new names. The classic QFL plot is subdivided into 15 fields - labelled by adjectives introduced long ago by K.A.W. Crook and endorsed by W.R. Dickinson and more recently by G.J. Weltje - which reflect relative abundances of the three main framework components (provided they exceed 10%QFL). According to standard use, the less abundant component goes first, the more abundant last (e.g., litho-feldspatho-quartzose composition translates into Q > F > L > 10%QFL). For lithic-rich sand and sandstone, information on the prevailing rock fragment type can be added by an additional free adjective (e.g., metamorphiclastic, carbonaticlastic), as proposed long ago by R.V. Ingersoll. For lithic-poor feldspatho-quartzose and quartzose sand and sandstone, further formal subdivisions are proposed based on the Q/F ratio, thus reaching a total of 18 compositional fields overall. Modern sand known to be derived from different source rocks and found in major world's rivers, deserts, and deep-sea fans fits in the pigeonholes defined by the relative abundance of quartz, feldspar, and lithic fragments. The aim of this classification is to restore directness in sandstone petrology, and to avoid ambiguities generated in the past by making reference to badly defined archetypes, such as greywacke or arkose, thus confusing petrographic composition with subjective considerations about plate-tectonic setting, texture, hydraulic behaviour, mechanical durability, or chemical durability in the illusion that a classification could be genetic at the same time as descriptive.
英文关键词	Sandstone petrology Gazzi-Dickinson method QFL diagram Sediment provenance Plate-tectonic setting Texture and composition Greywacke and arkose Rock fragments Chert, carbonate, and evaporite grains Classification of modern river, turbidite, and desert sand
类型	Review
语种	英语
国家	Italy
收录类别	SCI-E
WOS记录号	WOS:000474499500023
WOS关键词	GRAIN-SIZE DEPENDENCE ; DETRITAL MODES ; FORE-ARC ; PLATE-TECTONICS ; CHILE TRENCH ; COMPOSITIONAL VARIABILITY ; PROVENANCE ANALYSIS ; FLOOD VOLCANISM ; COLUMBIA RIVER ; RIFTED MARGINS
WOS类目	Geosciences, Multidisciplinary
WOS研究方向	Geology
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/215110
作者单位	Univ Milano Bicocca, Dept Earth & Environm Sci, Lab Provenance Studies, Milan, Italy
推荐引用方式 GB/T 7714	Garzanti, Eduardo. Petrographic classification of sand and sandstone[J],2019,192:545-563.
APA	Garzanti, Eduardo.(2019).Petrographic classification of sand and sandstone.EARTH-SCIENCE REVIEWS,192,545-563.
MLA	Garzanti, Eduardo."Petrographic classification of sand and sandstone".EARTH-SCIENCE REVIEWS 192(2019):545-563.

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