The sources of zircons in clastic rocks of the Riphean deposits of the Urals

Доклады Академии наук Pub Date : 2019-10-10 DOI:10.31857/s0869-56524884413-419

A. A. Krasnobaev, V. Puchkov, N. D. Sergeeva, S. V. Busharina

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Abstract

New age determinations of detrital zircons of sandstones augmented the possibilities of interpretation of their provenance. This interpretation is often restricted by a formal comparison of age-and-composition characteristics of detrital crystals with any very distant model objects. A different situation arises when the role of a source of a detritus is claimed by local objects. The analysis of SHRIMP and TIMS - datеs of zircons and U and Th concentrations in them, and also a comparison of histograms of primary zircons from Riphean volcanics and rocks of the Taratash complex on one hand and the detrital zircons from the sandstones of Vendian (Asha series) and Lower Riphean (Ai Formation) on the other, have shown that the age variations of sources and clastics are comparable in many aspects. It means that the age characteristics of primary zircons from the Riphean volcanics and rocks of the Taratash complex as sources of zircon clastics for the Riphean and Vendian sandstones in the Southern Urals are regulated by processes of resedimentation, though the influence of distant sources is not excluded.

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乌拉尔地区里芬矿床碎屑岩中锆石的来源

砂岩碎屑锆石的新时代测定增加了解释其物源的可能性。这种解释经常受到碎屑晶体的年龄和组成特征与任何非常遥远的模型物体的正式比较的限制。当碎屑来源的作用被当地物体所占有时，就会出现不同的情况。锆石SHRIMP和TIMS -数据及其U、Th浓度分析，以及里芬火山岩和塔拉塔什杂岩原生锆石直方图与文甸(亚沙系)和下里芬(艾组)砂岩碎屑锆石直方图的对比表明，烃源岩和碎屑岩的年龄变化在许多方面具有可比性。这意味着南乌拉尔地区里甫斯火山岩和塔拉塔什杂岩的原生锆石的年龄特征是由再沉积过程控制的，尽管不排除远源的影响。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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