南乌卢陶(哈萨克斯坦中部)的埃迪卡拉纪和寒武纪火山生成和沉积复合体:结构、年龄证据和形成背景

IF 1 4区 地球科学 Q3 GEOCHEMISTRY & GEOPHYSICS
A. A. Tretyakov, K. E. Degtyarev, N. A. Kanygina, A. N. Zhuravlev, S. Yu. Skuzovatov
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引用次数: 0

摘要

摘要 本文介绍了在中哈萨克斯坦西部乌卢陶地层南部(南乌卢陶)首次分离出的埃迪卡拉纪火山成因沉积岩和寒武纪沉积地层的年龄研究和论证结果。对喷出岩和土成岩的年龄估计(SHRIMP II)分别为 594 ± 3 Ma、594 ± 5 Ma 和 600 ± 2 Ma,其同位素地球化学特征首次证明了埃迪卡拉超俯冲岩浆活动在哈萨克斯坦和天山北部古生代的显现。所获得的数据表明,前寒武纪末期的乌卢陶地层参与了火山-岩浆岩带的结构,其碎片也是哈萨克斯坦西南部新元古代地块(Zheltavsky 和 Chuysko-Kendyktassky 地层)、南天山和卡拉库姆-塔吉克地层。埃迪卡拉超俯冲带的形成可能是新新生代活跃大陆边缘演化的延续,该大陆边缘在托尼安时期出现在超大陆罗迪尼亚的西北边缘。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Ediacaran and Cambrian Volcanogenic and Sedimentary Complexes of Southern Ulutau (Central Kazakhstan): Structure, Substantiation of Age, and Setting of Formation

Ediacaran and Cambrian Volcanogenic and Sedimentary Complexes of Southern Ulutau (Central Kazakhstan): Structure, Substantiation of Age, and Setting of Formation

Abstract

The article presents the results of studying and substantiating the age of the Ediacaran volcanogenic-sedimentary and Cambrian sedimentary strata isolated for the first time within the southern part of the Ulutau terrane (southern Ulutau) in the west of Central Kazakhstan. The age estimates (SHRIMP II) of 594 ± 3, 594 ± 5, and 600 ± 2 Ma obtained for effusive and tufogenic rocks, as well as their isotope-geochemical characteristics, are the first evidence of the manifestation of Ediacaran suprasubduction magmatism in the paleozoics of Kazakhstan and the northern Tien Shan. The obtained data indicate the participation of the Ulutau terrane at the end of the Precambrian in the structure of the volcanic-plutonic belt, fragments of which are also Neoproterozoic blocks within southwestern Kazakhstan (the Zheltavsky and Chuysko-Kendyktassky terranes) of the Southern Tien Shan and the Karakum‒Tajik terrane. The formation of the Ediacaran suprasubduction belt may be a continuation of the evolution of the Neoproterozoic active continental margin that arose in the Tonian period on the northwestern margin of the supercontinent Rodinia.

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来源期刊
Geotectonics
Geotectonics 地学-地球化学与地球物理
CiteScore
1.90
自引率
9.10%
发文量
28
审稿时长
3 months
期刊介绍: Geotectonics publishes articles on general and regional tectonics, structural geology, geodynamics, and experimental tectonics and considers the relation of tectonics to the deep structure of the earth, magmatism, metamorphism, and mineral resources.
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