The Oldest Island-Arc Granitoids of the Chingiz–Tarbagatai Region, Eastern Kazakhstan: Substantiation of the Age and Peculiarities of Composition

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发表日期：

2024年2月28日

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K. E. Degtyarev,
M. V. Luchitskaya,
A. A. Tret’yakov,
E. B. Sal’nikova,
Yu. V. Plotkina

摘要

Abstract

The oldest granitoids of the Kan–Chingiz Complex with quartz diorites, granodiorites, plagiogranites, and granites are dated for the first time in the Chingiz–Tarbagatai region of eastern Kazakhstan. The U‒Pb (ID-TIMS and SIMS) age of granites and plagiogranites is 509 ± 2 and 512 ± 3 Ma, which corresponds approximately to the Early–Middle Cambrian boundary. These data indicate the Early Cambrian age of volcanosedimentary sequences host granitoids. The peculiarities of the composition of granitoids of the Kan–Chingiz Complex point to their formation within an ensimatic island arc.