新太古代通古斯超级地体的东缘:西伯利亚地台中部钻孔资料

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2022-11-15 DOI:10.1134/S0869591122050058
A. V. Samsonov, K. G. Erofeeva, Yu. O. Larionova, A. N. Larionov, N. B. Kuznetsov, T. V. Romanyuk, N. V. Solovyova, O. M. Zhilicheva, A. S. Dubenskiy, V. S. Sheshukov
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引用次数: 1

摘要

本文介绍了在西伯利亚克拉通中部钻取的Kulindinskaya-1孔所恢复的花岗岩和片麻岩资料。黑云母花岗岩呈斑岩状,组成特征为i型,重稀土富集,重稀土中度亏缺,Eu、Sr、Nb呈负异常,Zr呈正异常。花岗岩的U - Pb锆石年龄为新太古代(2525±10 Ma),单核锆石颗粒年龄约为2.6 Ga,可能为地壳岩浆来源。花岗岩的模型年龄TNd(DM) = 2.77 Ga,表明产生初始熔体的地壳是在熔化期前不久形成的。花岗岩的年龄和各项特征与通古斯超地体西部钻穿的于鲁沁地块接近。黑云母片麻岩明显来源于沉积岩,并在花岗岩就位时被大量改造。片麻岩中Cr和Ni的富集可能继承自沉积原岩,而片麻岩中的REE、HFSE和LILE的浓度和分布与花岗岩相似。协和(D <U−Pb锆石年龄(根据LA-ICP-MS数据)在3284 ~ 2620 Ma之间变化较大,其中两个主要峰位于2717和2678 Ma。片麻岩的模式年龄TNd(DM) = 2.91 Ga,证实了古地壳成分对岩石沉积原岩的贡献。碎屑锆石的最小年龄为2.62 Ga,决定了沉积的最大年龄限制;花岗岩侵入物的最小年龄为2.53 Ga。根据我们的资料,Kulindinskaya-1钻孔恢复的太古代片麻岩和花岗岩可能构成了新太古代通古斯超级地体的东部。在Kulindinskaya-1东北方向20km处的Ereminskaya-101钻孔,发现片麻岩模式年龄TNd(DM)为2.30 ~ 2.37 Ga,属于邻近的Taimyr - Baikal缝合带,古元古代岩石分布广泛。相邻杂岩体的对比地壳历史提供了它们是构造组合的依据,这是将泰米尔-贝加尔湖缝合带视为古元古代碰撞造山带的另一个理由。
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Eastern Margin of the Neoarchean Tunguska Superterrane: Data from Boreholes in the Central Part of the Siberian Platform

The paper presents data on granites and gneisses recovered by Kulindinskaya-1 hole drilled in the central part of the Siberian Craton. The biotite granites retain a porphyritic texture, correspond to I-type according to their compositional features, are enriched in LREE and moderately depleted in HREE, and have negative Eu, Sr, and Nb and positive Zr anomalies. The U−Pb zircon age of the granites is Neoarchean (2525 ± 10 Ma), with single cores of zircon grains dated at about 2.6 Ga, which likely suggests a crustal source of the granitic magmas. The model age TNd(DM) = 2.77 Ga of the granite shows that the crust from which the initial melts were derived had been formed shortly before the melting episode. In terms of age and all characteristics, the granites are close to those of the Yurubchen massif, which was drilled through in the western part of the Tunguska superterrane. The biotite gneiss was apparently derived from sedimentary rocks and was heavily reworked when the granites were emplaced. The enrichment of the gneiss in Cr and Ni is probably inherited from the sedimentary protolith, whereas the REE, HFSE, and LILE concentrations and distribution in the gneiss are similar to those of the granite. The concordant (D < 1%) U−Pb zircon ages (according to LA-ICP-MS data) broadly vary from 3284 to 2620 Ma, with two major peaks at 2717 and 2678 Ma. The model age of the gneiss TNd(DM) = 2.91 Ga confirms a contribution of the ancient crustal component to the sedimentary protolith of the rock. The minimum age of the detrital zircon, 2.62 Ga, determines the maximum age limit for sedimentation, and the minimum age limit is set by the age of the granite intrusions at 2.53 Ga. According to our data, the Archean gneisses and granites recovered by the Kulindinskaya-1 drillhole probably compose the eastern part of the Neoarchean Tunguska superterrane. Ereminskaya-101 drillhole, which was drilled 20 km northeast of Kulindinskaya-1, recovered gneisses with model ages TNd(DM) from 2.30 to 2.37 Ga, which belong to the adjacent Taimyr−Baikal suture zone with widespread Paleoproterozoic rocks. The contrasting crustal history of the adjacent complexes provides grounds to suggest that they were tectonically combined, which is an additional reason to consider the Taimyr−Baikal suture zone as a Paleoproterozoic collisional orogen.

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来源期刊
Petrology
Petrology 地学-地球科学综合
CiteScore
2.40
自引率
20.00%
发文量
27
审稿时长
>12 weeks
期刊介绍: Petrology is a journal of magmatic, metamorphic, and experimental petrology, mineralogy, and geochemistry. The journal offers comprehensive information on all multidisciplinary aspects of theoretical, experimental, and applied petrology. By giving special consideration to studies on the petrography of different regions of the former Soviet Union, Petrology 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.
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