Age, Composition, and Tectonic Setting of the Formation of Late Neoproterozoic (Late Baikalian) Complexes in the Kichera Zone, Baikal-Vitim Belt, Northern Baikal Area: Geological, Geochronological, and Nd Isotope Data

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS Petrology Pub Date : 2022-07-24 DOI:10.1134/S0869591122040026
A. A. Andreev, E. Yu. Rytsk, S. D. Velikoslavinskii, E. V. Tolmacheva, E. S. Bogomolov, Y. M. Lebedeva, A. M. Fedoseenko
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Abstract

The paper presents data on the geological structure of the Kichera zone of the Baikal–Vitim belt (BVB) at the boundary between the marginal part of the Siberian craton and the Barguzin–Vitim superterrane of the Central Asian Orogenic Belt. Early Neoproterozoic (Early Baikalian) and Late Neoproterozoic (Late Baikalian) structures and complexes are identified and characterized in the Kichera zone of the BVB. Data are presented on the geochemistry of the rocks and on their U–Pb isotope age (zircon, SIMS and ID-TIMS) and on the Nd isotope characteristics of rocks from various parts of the Kichera zone, including representative rock association of the Nyurundukan migmatite–tonalite–metabasite complex with MORB-type tholeiites and tholeiites with intraplate geochemical features. It is shown that the sources of the Early Neoproterozoic complexes of the Kichera zone, which were metamorphosed at 0.76–0.74 Ga as a result of accretion events in the marginal part of the craton, were dominated by Early Precambrian recycled crustal material. The Late Neoproterozoic complexes typomorphic of the Kichera zone were formed in the Cryogenian–Ediacaran (720–545 Ma) from prevailing juvenile sources. Our data suggest that the metabasites of the Nyurundukan complex were formed in an environment of segmented troughs of the pull-apart paleorift system of the Kichera zone and can be compared with a reduced complex of continental-margin ophiolites transformed at 630 ± 7 to 615 ± 3 Ma. The destruction of the ancient continental crust of the craton ended with the formation and exhumation of deep rocks in the Late Ediacaran, the emplacement of adakite granites of the postcollisional geochemical type, and the formation of grabens filled with a terrigenous complex. The juvenile and riftogenic crust produced during the Late Neoproterozoic tectonic evolution of the Kichera rift zone does not show any features of mature continental-type crust.

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北贝加尔地区贝加尔-维季姆带 Kichera 区新新生代晚期(贝加尔晚期)复合体形成的年龄、组成和构造背景:地质、地质年代和钕同位素数据
本文介绍了位于西伯利亚克拉通边缘部分和中亚造山带巴尔古津-维季姆超岩带(Barguzin-Vitim superterrane)交界处的贝加尔-维季姆带(BVB)基切拉区地质结构的数据。在 BVB 的 Kichera 区发现了新近新生代早期(贝加尔湖早期)和新近新生代晚期(贝加尔湖晚期)的构造和复合体,并确定了其特征。提供了有关岩石地球化学及其 U-Pb 同位素年龄(锆石、SIMS 和 ID-TIMS)的数据,以及基切拉区各部分岩石的钕同位素特征的数据,包括 Nyurundukan 偏闪长岩-黑云母-元青花岩复合体与 MORB 型透辉石和具有板内地球化学特征的透辉石之间的代表性岩石关联。研究表明,基切拉区早新元古代复合岩的来源主要是早前寒武纪回收的地壳物质,这些复合岩是在 0.76-0.74 Ga 时因克拉通边缘地区的增生事件而变质的。基切拉区典型的新元古代晚期复合体形成于冷元古代-始新世(720-545Ma),由当时的幼生源形成。我们的数据表明,Nyurundukan岩群的变质岩是在基切拉带拉开式古隆起系统的分段槽环境中形成的,可以与在630±7至615±3Ma转化的大陆边缘蛇绿岩退化岩群相比较。随着埃迪卡拉纪晚期深部岩石的形成和掘出、碰撞后地球化学类型的阿达克花岗岩的置入以及充满土著复合体的地堑的形成,克拉通古大陆地壳的破坏结束了。基切拉断裂带在新近纪晚期构造演化过程中形成的幼年地壳和断裂成因地壳没有显示出成熟大陆型地壳的任何特征。
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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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