Sources of Neogene Rare Metal–Titanium Placers of the Northeastern Wall of the Dnieper–Donets Basin: First Results of U–Pb Geochronological Studies of Detrital Zircon

IF 0.7 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY Doklady Earth Sciences Pub Date : 2024-04-19 DOI:10.1134/s1028334x24601500

A. V. Chefranova, K. G. Erofeeva, A. S. Dubenskiy

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Abstract

Runoff of terrigenous material involved in the structure of Neogene rare metal–Ti placers of the northeastern side of the Dniepr–Donets Basin (DDB) is determined using lithological and mineralogical methods including U–Pb geochronological and chemical study of detrital zircon. The peculiarities of an assemblage of accessory minerals of heavy fraction of placers, the morphology of individual grains, and the depletion of most zircons in U, Th, Y, and Yb indicate that the material was sourced from chemical weathering mantles, which probably developed after Proterozoic (70%) and Neoarchean (15%) metamorphic rocks. The presence of Paleozoic zircon crystals and a higher U, Th, Y, and Yb content are evidence of the erosion of igneous rocks of the Neoproterozoic–Early Paleozoic trap complexes and Devonian intrusive and volcanosedimentary rocks of the DDB. The involvement of clasts of the above rocks in sedimentary recycling was promoted by the evolution of abundant DDB salt tectonics.

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第聂伯河-顿涅茨盆地东北壁新近纪稀有金属钛矿床的来源：碎屑锆石 U-Pb 地质年代研究的初步结果

摘要利用岩石学和矿物学方法，包括锆石碎片的铀-铅地质年代和化学研究，确定了第聂伯河-顿涅茨盆地（DDB）东北侧新近纪稀有金属-钛矿床结构所涉及的陆相物质的流失情况。块状重矿物的附属矿物组合、单个颗粒的形态以及大多数锆石在铀、钍、钇和镱方面的损耗的特殊性表明，这些物质来自化学风化幔，可能是在新生代（70%）和新元古代（15%）变质岩之后形成的。古生代锆石晶体的存在以及较高的铀、钍、钇和镱含量，证明了新元古代-早古生代陷落复合体的火成岩以及泥盆纪侵入岩和泥盆纪火山沉积岩的侵蚀。DDB丰富的盐构造演化促进了上述岩石的碎屑参与沉积循环。

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来源期刊

Doklady Earth Sciences 地学-地球科学综合

CiteScore

1.40

自引率

22.20%

发文量

138

审稿时长

3-6 weeks

期刊介绍： Doklady Earth Sciences is a journal that publishes new research in Earth science of great significance. Initially the journal was a forum of the Russian Academy of Science and published only best contributions from Russia. Now the journal welcomes submissions from any country in the English or Russian language. Every manuscript must be recommended by Russian or foreign members of the Russian Academy of Sciences.