POTENTIAL ICE CRYSTAL MARKS FROM PENNSYLVANIAN–PERMIAN EQUATORIAL RED-BEDS OF NORTHWEST COLORADO, U.S.A.

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-12-30 DOI:10.2110/palo.2021.024

S. Voigt, K. Oliver, B. Small

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引用次数: 5

Abstract

Abstract: The Pennsylvanian–Permian Maroon Formation of northwest Colorado is an up to 4,600 m thick succession of mainly siliciclastic continental red-beds deposited in equatorial intermontane basins of the Ancestral Rocky Mountains. Sedimentary surfaces of fluvio-lacustrine to eolian siltstones and fine-grained sandstones from various stratigraphic levels within the Maroon Formation preserve cm-sized straight to gently curved sediment-filled acicular structures referred to five morphological groups: single, branched, stellate, rosette, and bunched. Depositional environment, shape, and size of the structures are most similar to ice crystal marks that result from freezing of water-saturated fine-grained substrate at the sediment-air interface. They differ from other syngenetically produced crystals and crystal pseudomorphs in sedimentary rocks mainly by crystal shape and environmental conditions. The potential ice crystal marks of the Maroon Formation are notable for the fidelity and morphological diversity of the crystal casts and could be a key for the understanding of similar but hitherto often only called enigmatic structures of the sedimentary rock record. The ice crystal mark occurrences in the Maroon Formation suggest that night frost affected lower elevation equatorial areas during the climax of the Late Paleozoic Ice Age and may stimulate research on evolutionary adaptations of early terrestrial biota to overcome significant air temperature fluctuations.

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美国科罗拉多州西北部宾夕法尼亚-二叠纪赤道红层的潜在冰晶痕迹

摘要/ Abstract摘要:美国科罗拉多州西北部的宾夕法尼亚—二叠系Maroon组是一套厚达4600 m的以硅质碎屑为主的陆相红层，沉积于祖先落基山脉的赤道山间盆地。褐红色组内不同地层的河流湖相到风成粉砂岩和细粒砂岩的沉积表面保存了厘米大小的直状到微弯曲的填充沉积物的针状结构，分为五个形态组:单个、分支、星状、玫瑰花状和束状。这些结构的沉积环境、形状和大小与沉积物-空气界面上饱和水的细粒基质冻结形成的冰晶标志最为相似。它们与沉积岩中其他同生晶体和假晶的区别主要在于晶体形态和环境条件。褐红色组的潜在冰晶标志因其晶体铸件的保真度和形态多样性而引人注目，这可能是理解沉积岩记录中类似但迄今通常只被称为神秘结构的关键。栗色组冰晶标记的出现表明，晚古生代冰期高潮期间，夜霜影响了低海拔赤道地区，并可能刺激早期陆生生物群的进化适应研究，以克服显著的气温波动。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.