Kichany Structure of the Archean Tiksheozero Greenstone Belt of the Fennoscandian: Evidence from New Geochemical and Geochronological Data

IF 0.7 4区 地球科学 Q4 GEOCHEMISTRY & GEOPHYSICS Geochemistry International Pub Date : 2024-10-22 DOI:10.1134/S0016702924700496
T. A. Myskova, A. S. Nikonova, K. A. Nikonov, I. A. Zhitnikova, P. A. Lvov
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Abstract

New geological, geochemical, and geochronological (U-Pb zircon) data obtained on the greenstone rocks of the Kichany structure from the Archean Tiksheozero greenstone belt made it possible to clarify and supplement the previously proposed stratification schemes. The composition of the identified sequences, the order and duration of their formation have been specified. The Archean supracrustal rocks are divided into three sequences. The lower sequence (previously not identified) is represented by a bimodal series: tholeiitic metabasalts and felsic metavolcanics, with subordinate metagraywackes. It has been formed for over 20 million years (from 2788 ± 5 to 2766 ± 9 Ma). Sm–Nd data obtained on basaltic metaandesites (Sm–Nd model age 2.86 Ga and εNd = 2.92) indicate their mantle nature. Metarhyolites from the lower sequence with a Sm–Nd model age of 2.89 Ga and εNd = 2.59 were generated from a source with a short residence time. The differentiated volcanic series of the upper sequence (from basalts to dacites) has been also formed for about 20 million years (2738 ± 7–2716 ± 7 Ma). The parental melts for the intermediate–felsic metavolcanics of the upper sequence are variably enriched in ancient crustal matter. The oldest rocks with a Sm–Nd model age of 2.84 Ga and εNd = 2.67 were formed during the Early Neoarchean crust-forming event. The younger rocks have a different contribution of ancient crustal material: significant contribution for dacites (Sm–Nd model age of 3 Ga and εNd = 0.4) and less significant contribution for dacitic andesites (Sm–Nd model age of 2.89 Ga and εNd = 1.73). In the Paleoproterozoic (from 1786 ± 11 to 1796 ± 6 Ma), the supracrustal rocks of the Kichany structure underwent metamorphic transformations.

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芬诺斯康迪亚阿新世 Tiksheozero 绿岩带的 Kichany 结构:来自新地球化学和地质年代数据的证据
从 Archean Tiksheozero 绿岩带的 Kichany 构造绿岩中获得的新的地质、地球化学和地球同步学(U-Pb 锆石)数据使我们有可能澄清和补充之前提出的分层方案。已确定序列的组成、形成顺序和持续时间。阿基坦上壳岩被分为三个层序。较低的序列(以前未确定)由一个双峰系列代表:透辉石变质岩和长英质变质岩,以及从属的变质岩。其形成时间超过 2000 万年(从 2788 ± 5 到 2766 ± 9 Ma)。在玄武质元闪长岩上获得的 Sm-Nd 数据(Sm-Nd 模型年龄为 2.86 Ga,εNd = 2.92)表明了其地幔性质。下部序列的元闪长岩(Sm-Nd 模型年龄为 2.89 Ga,εNd = 2.59)产生于一个停留时间较短的源。上序列的分化火山岩系列(从玄武岩到英安岩)也形成了大约2000万年(2738 ± 7-2716 ± 7 Ma)。上部岩序的中熔岩变质火山岩的母熔体不同程度地富含古地壳物质。最古老的岩石的Sm-Nd模型年龄为2.84 Ga,εNd = 2.67,是在早新元古代地壳形成事件中形成的。较年轻的岩石所含的古地壳物质各不相同:白云母所含的古地壳物质较多(Sm-Nd模型年龄为3 Ga,εNd=0.4),而白云质安山岩所含的古地壳物质较少(Sm-Nd模型年龄为2.89 Ga,εNd=1.73)。在古近代(1786 ± 11 至 1796 ± 6 Ma),Kichany 构造的上壳岩经历了变质转换。
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来源期刊
Geochemistry International
Geochemistry International 地学-地球化学与地球物理
CiteScore
1.60
自引率
12.50%
发文量
89
审稿时长
1 months
期刊介绍: Geochemistry International is a peer reviewed journal that publishes articles on cosmochemistry; geochemistry of magmatic, metamorphic, hydrothermal, and sedimentary processes; isotope geochemistry; organic geochemistry; applied geochemistry; and chemistry of the environment. Geochemistry International provides readers with a unique opportunity to refine their understanding of the geology of the vast territory of the Eurasian continent. The journal welcomes manuscripts from all countries in the English or Russian language.
期刊最新文献
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