Mеsozoic Tectonothermal Evolution of the Zagan Metamorphic Core Complex in Western Transbaikalia: 40Ar/39Ar and FTA Dating

被引：0

作者：

Buslov, Mikhail M. ^{[1
]}

Kulikova, Anna V. ^{[1
,2
]}

Sklyarov, Evgenii V. ^{[3
]}

Travin, Alexei V. ^{[1
]}

机构：

[1] Russian Acad Sci, VS Sobolev Inst Geol & Mineral, Siberian Branch, Novosibirsk, Russia

[2] Kazan Fed Univ, Kazan, Russia

[3] Russian Acad Sci, Inst Earths Crust, Siberian Branch, Irkutsk, Russia

来源：

LITHOSPHERE | 2024年 / 2024卷

基金：

俄罗斯科学基金会;

关键词：

MONGOL-OKHOTSK OCEAN; ASIAN OROGENIC BELT; BAIKAL REGION; ALTAI-SAYAN; TIEN-SHAN; U-PB; TECTONICS; BASIN; AGE; THERMOCHRONOLOGY;

D O I：

10.2113/2024/lithosphere_2023_306

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

A model of tectonothermal evolution of the Zagan metamorphic core complex (MCC) based on the new data from 40Ar/39Ar dating of amphibole, mica, and apatite fission-track dating is discussed. A relationship with the long-range impact of processes from the collision of the North China (Amurian-North China) block with the Siberian continent in the Mesozoic era is proposed. The Zagan M & Scy;& Scy; was formed in the Cretaceous period on the southern flank of a high mountain uplift of Western Transbaikalia, composed of late Paleozoic granitoids of the Angara-Vitim batholith. According to Ar-40/Ar-39 dating of amphiboles and micas from the mylonite zone, the active development time of the Zagan MCC corresponds to the early Cretaceous epoch (131, 114 Ma). The tectonic exposure of the core from about 15 km to the depths of about 10 km occurred at a rate of tectonic erosion of 0.4-0.3 mm/year as a result of post-collisional extension of the Mongol-Okhotsk orogen. Apatite fission-track dating shows that further exhumation and cooling of the rocks to about 3 km occurred in the lower-upper Cretaceous epoch (112, 87 Ma). The erosional denudation rate was about 0.3 mm/year.MCC- metamorphic core complexes, AFT- apatite fission-track

引用

页数：14

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