Abstract

The article analyzes the position of individual and average data points of the Archean and Early Proterozoic metaaleuropelites (Isua and Akilia associations, West Greenland; Beit Bridge Complex, Limpopo Province, South Africa; Moodies, Mozaan, and Pretoria groups, Barberton Mountain Land, South Africa; Kola Group, Baltic Shield, Russia; Nurmes paragneisses, Eastern Finland; Onot greenstone belt, southeastern Sayan region, Russia; Rampur Group, Lesser Himalayas, India; Kan metamorphic complex, eastern Sayan region, Russia; Ladoga Group, northern Ladoga region, Russia; Yenisei metamorphic complex, Russia; and others) in the (La/Yb)_N–Eu/Eu* and (La/Yb)_N–Th diagrams with classification fields constructed from data on the content of REE and Th in the fine grained clastic/aleuropelitic sediments near the estuary of different-category modern rivers, according to (Bayon et al., 2015). It has been shown that the vast majority of data points of metaaleuropelites are localized in fields 1 (particulates of major rivers in the world), 2 (particulates of rivers draining sedimentary substrates) and 4 (particulates of rivers flowing through volcanic rock terrains), as well as the zone overlapping fields 1–3 (particulates of rivers feeding on erosion products of the magmatic/metamorphic terrains). Data points of all examined objects with an age of more than 2.8 Ga in the (La/Yb)_N–Eu/Eu* diagram are concentrated mainly in field 4. If all our assumptions are correct, these observations suggest the following conclusion: until the above-indicated time, large rivers and, most likely, rivers draining mainly sedimentary rocks did not exist, and processes of the recycling of fine-grained aluminosiliciclastics were reduced.

中文翻译：

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早前寒武纪元古灰岩：REE-Th系统学是重建其细粒铝硅质碎屑源的关键

摘要

这篇文章分析了太古代和元古代的元古生物（伊索阿和阿基利亚协会，西格陵兰；南非林波波省的贝特桥综合体；穆迪，莫扎伊和比勒陀利亚组，南巴伯顿山地）的单个数据点和平均数据点的位置。非洲；俄罗斯波罗的海盾Kola集团；芬兰东部Nurmes paragneisses；俄罗斯东南部萨彦地区的奥诺特绿岩带；印度小喜马拉雅山的Rampur集团；俄罗斯东部萨彦地区的Kan变质带；北部拉多加地区的拉多加集团（La / Yb）_N –Eu / Eu *和（La / Yb）_N–根据（Bayon等人，2015）的数据，根据不同类别的现代河流河口附近细粒碎屑/古石质沉积物中的稀土元素和content含量数据构建了带有分类场的Th图。结果表明，大多数变质亚磷灰石的数据点都位于区域1（世界主要河流的颗粒），区域2（排放沉积底物的河流的颗粒）和区域4（流经火山岩地形的河流的颗粒），以及与区域1-3重叠的区域（以岩浆/变质地形的侵蚀产物为食的河流颗粒）。（La / Yb）_N中所有年龄大于2.8 Ga的被检查物体的数据点–Eu / Eu *图主要集中在字段4中。如果我们所有的假设都是正确的，则这些观察结果得出以下结论：在上述时间之前，还没有大河流，最有可能是主要排出沉积岩的河流，减少了细粒硅铝屑塑料的回收过程。