阿富汗中部古近系深部岩浆作用及其与印度-欧亚碰撞的关系

IF 0.5 4区地球科学 Q4 GEOLOGY

Baltica Pub Date : 2020-12-28 DOI:10.5200/baltica.2020.2.2

G. Motuza, S. Šliaupa

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引用次数: 1

摘要

在阿富汗中部古尔省的塔吉克地块南缘和班德巴扬地区，出现了大量花岗岩侵入体。此前，它们曾与三叠纪和白垩纪的Cimmerian火成岩事件有关。然而，新的U-Pb测年显示，这些花岗岩侵入体发生在始新世，时间跨度为41–36 Ma。它们与填充有相同年龄火山沉积序列的局部凹陷数量有关。这些数据表明，古近系发生了一次强烈的短期岩浆事件，影响了该地区。岩浆作用可能与大约在同一时间开始的印度-欧亚大陆碰撞有关。它很可能导致了沿Hari-Rod断层向西的地壳块体的水平位移。

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Palaeogene plutonic magmatism in Central Afghanistan, and its relation to the India-Eurasia collision

Numerous granitic intrusions occur along the southern margin of the Tajik Block and the Band-e-Bayan Zone in the Ghor Province of Central Afghanistan. Previously, they used to be linked to the Cimmerian igneous episodes of Triassic and Cretaceous ages. However, the new U-Pb dating has revealed that these granite intrusions occurred during the Eocene within a narrow time span of 41–36 Ma. They are related to the number of local depressions filled with the volcanic-sedimentary sequence of the same age. These data indicate an intense short-termed magmatic event that affected the region in the Palaeogene. The magmatism might be related to the India-Eurasia collision, which started approximately at the same time. It is likely to have induced the horizontal displacement of crustal blocks westwards along the Hari Rod fault.

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来源期刊

Baltica 地学-地质学

CiteScore

1.30

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： BALTICA is an international periodical journal on Earth sciences devoted to the Baltic countries region and the Baltic Sea problems. This edition as a Yearbook is established in 1961 by initiative of Academician Vytautas Gudelis. Since 1993, an Editor-in-Chief of the journal became Academician Algimantas Grigelis. BALTICA is published biannually (in June and December) in cooperation with geoscientists of the circum-Baltic States. BALTICA is publishing original peer-reviewed papers of international interests on various Earth sciences issues. The particular emphasis is given to Quaternary geology, climate changes and development of ecosystems, palaeogeography, environmental geology, as well as stratigraphy, tectonics, sedimentology and surface processes with relevance to the geological history of the Baltic Sea and land areas. Journal emphasizes modern techniques, methodology and standards. The journal structure comprises original articles, short reviews, information, bibliography.