Late Cambrian (∼490 Ma) Arc Volcanic Rocks of the North Tianshan of Kyrgyzstan: Age Constraints from U-Pb Zircon Dating

被引：0
作者：
Alexeiev, D. V. [1 ]
Rojas-Agramonte, Y. [2 ]
Tretyakov, A. A. [1 ]
Gerdes, A. [3 ,4 ]
机构：
[1] Russian Acad Sci, Geol Inst, Moscow 119017, Russia
[2] Christian Albrechts Univ Kiel, Kiel, Germany
[3] Goethe Univ Frankfurt Main, Frankfurt, Germany
[4] Frankfurt Isotope & Element Res Ctr FIERCE, Frankfurt, Germany
来源：
DOKLADY EARTH SCIENCES | 2023年 / 513卷 / 01期
关键词：
U-Pb dating; zircons; arc volcanic rocks; Cambrian; North Tianshan;
D O I：
10.1134/S1028334X2360189X
中图分类号：
P [天文学、地球科学];
学科分类号：
07 ;
摘要：
In the present contribution, we aim to better constrain the age of the oldest arc-related volcanic units in the North Tianshan of Kyrgyzstan (NTS) in order to improve our understanding of the early evolution of subduction systems in the western part of the Central Asian Orogenic Belt. We conducted zircon U-Pb dating (LA-ICP-MS) on andesitic tuffs from the Sultansary and Tashtambektor formations, which were previously believed to be of early Cambrian and middle Cambrian to early Ordovician age, respectively. The results reveal ages of 491 +/- 3 and 487 +/- 3 Ma for these formations, indicating that both units are of Late Cambrian age. We conclude that these volcanic rocks belong to a major magmatic arc that evolved on a heterogeneous basement in the NTS during the Late Cambrian and Early Ordovician.
引用
收藏
页码：1115 / 1120
页数：6
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