New 40Ar/39Ar Ages of Cretaceous Continental Volcanics from Central Chukotka: Implications for Initiation and Duration of Volcanism within the Northern Part of the Okhotsk Chukotka Volcanic Belt (Northeastern Eurasia)
New 40Ar/39Ar Ages of Cretaceous Continental Volcanics from Central Chukotka: Implications for Initiation and Duration of Volcanism within the Northern Part of the Okhotsk Chukotka Volcanic Belt (Northeastern Eurasia)
复制标题
楚科奇中部白垩纪大陆火山的新 40Ar/39Ar 年龄：对鄂霍次克楚科奇火山带北部（欧亚大陆东北部）火山活动的起始和持续时间的影响
DOI：
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发表时间：
2004
期刊：
影响因子：
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通讯作者：
I. Y. Cherepanova
中科院分区：
文献类型：
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作者：
V. Ispolatov;P. Tikhomirov;M. Heizler;I. Y. Cherepanova
我们使用单晶三胺激光聚变 40Ar/39Ar 方法对来自白垩纪鄂霍茨克-楚科奇火山带（欧亚大陆东北部）北部（楚科奇）的五个火山岩样本进行了年代测定。最下部地层单元的 4 个样品的年龄范围为 87.94 至 87.08 Ma，剖面顶部的 1 个样品的年龄为 87.55 Ma。新的结果与之前发布的 40Ar/39Ar 数据相结合表明，该带北部的火山活动始于科尼亚纪时期，大约 1000 年。 88 Ma，并且非常短暂（约 1-6 m.yr.）。
We used the single‐crystal sanidine laser fusion 40Ar/39Ar method to date five samples of volcanic rocks from the northern (Chukotka) part of the Cretaceous Okhotsk‐Chukotka volcanic belt (northeastern Eurasia). Ages of four samples from lowermost stratigraphic units range from 87.94 to 87.08 Ma, and one sample from the top of the section shows the age of 87.55 Ma. New results combined with previously published 40Ar/39Ar data indicate that volcanism within the northern part of the belt started in Coniacian time, at ca. 88 Ma, and was very short‐lived (ca. 1–6 m.yr.).