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
{"title":"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","authors":"A. A. Andreev,&nbsp;E. Yu. Rytsk,&nbsp;S. D. Velikoslavinskii,&nbsp;E. V. Tolmacheva,&nbsp;E. S. Bogomolov,&nbsp;Y. M. Lebedeva,&nbsp;A. M. Fedoseenko","doi":"10.1134/S0869591122040026","DOIUrl":null,"url":null,"abstract":"<p>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.</p>","PeriodicalId":20026,"journal":{"name":"Petrology","volume":"30 4","pages":"337 - 368"},"PeriodicalIF":1.0000,"publicationDate":"2022-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Petrology","FirstCategoryId":"89","ListUrlMain":"https://link.springer.com/article/10.1134/S0869591122040026","RegionNum":4,"RegionCategory":"地球科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"GEOCHEMISTRY & GEOPHYSICS","Score":null,"Total":0}
引用次数: 0

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.

Abstract Image

查看原文
分享 分享
微信好友 朋友圈 QQ好友 复制链接
本刊更多论文
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。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
求助全文
约1分钟内获得全文 去求助
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.
期刊最新文献
Osumilite-Bearing Lavas of the Keli Highland (Greater Caucasus): Petrological and Geochemical Characteristics, Mineral Composition, and Conditions of Melt Generation The First Discovery of Archean Dolerite Dikes in the Western Part of the Aldan Shield Generalized P–T Path and Fluid Regime of the Exhumation of Metapelites in the Central Zone of the Limpopo Complex, South Africa Raman Spectroscopic Data of the Quenching Phases of a Pt Solution in a Low Water Reduced Carbonic Fluid at P = 200 and T = 950–1000°C Genesis of Triassic Buziwannan Granites in the West Kunlun Orogen Belt, China: Constraints from in Situ Major, Trace and Sr Isotope Analyses of Plagioclase
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
×
提示
您的信息不完整,为了账户安全,请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
0
微信
客服QQ
Book学术公众号 扫码关注我们
反馈
×
意见反馈
请填写您的意见或建议
请填写您的手机或邮箱
已复制链接
已复制链接
快去分享给好友吧!
我知道了
×
扫码分享
扫码分享
Book学术官方微信
Book学术文献互助
Book学术文献互助群
群 号:481959085
Book学术
文献互助 智能选刊 最新文献 互助须知 联系我们:info@booksci.cn
Book学术提供免费学术资源搜索服务,方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。
Copyright © 2023 Book学术 All rights reserved.
ghs 京公网安备 11010802042870号 京ICP备2023020795号-1