Abstract

The first data of U/Pb and ⁴⁰Ar/³⁹Ar dating of volcanogenic rocks of the Pre-Dzhugdzhur volcano-tectonic trough (PDVT) of the Okhotsk–Chukotka volcanogenic belt (OChVB) confirm that the supra-subduction complexes, identical in composition and position in the geological section, were formed at different times in the main arc sector of the OChVB and adjacent flank zones. It has been established that the flank zones of the belt formed at different times as well. The main arc sector was formed with a lag of 9–11 Ma related to the Western Okhotsk flank zone and 5–8 Ma ahead related to the Eastern Chukotka flank zone. The results obtained have been analyzed along with the data on Albian magmatism of Northeastern Russia. This allowed us to suggest that the area of the future Pre-Dzhugdzhur and Ul’ya volcano-tectonic troughs was affected by active volcanism of the convergent margin regime during the Albian, when that part of the region that later became the main arc of the OChVB developed in the setting of the transformed margin.

中文翻译：

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卓格祖尔火山前U / Pb和40 Ar / 39 Ar年代的第一个数据：鄂霍次克–楚科奇火山火山带各个部分形成的时间多样性的新证据

摘要

U / Pb和⁴⁰ Ar / ³⁹的第一数据鄂霍次克–楚科奇火山火山带（OChVB）的前朱格祖尔火山构造槽（PDVT）火山岩的Ar定年证实，超俯冲复合物的形成和位置在地质剖面上是相同的，且形成时间不同在OChVB的主弧区和相邻的侧面区域中。已经确定的是，皮带的侧面区域也在不同的时间形成。与西部鄂霍次克侧翼带有关的主要弧段形成为9-11 Ma的滞后，与东部楚科奇火山侧翼区域有关的滞后为5-8 Ma的滞后。已对获得的结果以及俄罗斯东北部阿尔比岩浆岩的数据进行了分析。