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首页> 外文期刊>岩石鉱物科学 >Stratigraphy and K-Ar dating of volcanic rocks from the Inaniwadake district, Northeast Japan arc: The period of extremely low-K magmatism
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Stratigraphy and K-Ar dating of volcanic rocks from the Inaniwadake district, Northeast Japan arc: The period of extremely low-K magmatism

机译：日本东北部稻宁岩岳地区火山岩的地层学和K-Ar测年：极低K岩浆作用时期

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摘要

The Inaniwadake volcano, situated on the northern part of the volcanic front of Northeast (NE) Japan arc, comprises two groups of volcanic rocks which overlie the Kiritoshi Formation and the lower part of the Itsukaichi Formation. The lower group is the Joboji Andesite Member belonging to the Itsukaichi Formation, distributed in the northern and eastern flanks of the Inaniwadake volcano, and composed of lavas with pyroclastics. The Inaniwadake Formation, the upper group, is distributed in the most part of the Inaniwadake volcano, and can be divided into the Takamagezawa (lower), Hanakosodemine (middle) and Takamagehara (upper) Basalt Members, all of which are composed of lavas with minor pyroclasts.Three samples were chosen for K-Ar dating. The sample from the Takamagehara Basalt Member, the youngest lava of the study area, shows 2.67 + - 23 Ma, while the other two samples from the Joboji Andesite Member show 6.52 + - 0.26 Ma and 6.95 + - 0.26 Ma.All the Inaniwadake volcanic rocks including above samples are characterized by extremely low K_2O suites like as the other late Miocene to Pliocene volcanic rocks from Mitaki and Kurohanayama, the southern part of NE Japan arc. These Tertiary volcanic rocks are mainly basalts and basaltic andesites in composition, and distinctively lower in K_2O content than those of Quaternary volcanoes on the volcanic front. These extremely low-K volcanism coincide contemporaneously with the formation of a number of Tate Miocene to Pliocene calderas of NE Japan arc.
机译：稻平岳火山位于日本东北弧火山前沿的北部，由两组火山岩组成，分别覆盖在桐吉组和严日市组的下部。下部组是属于五日市组的净房寺安山岩段，分布在稻宁岩岳火山的北侧和东侧，由具有火山喷砂作用的熔岩组成。稻宁岩岳组，上部组，分布在稻宁岩岳火山的大部分地区，可分为高驹泽（下）、花子峰（中）和高影原（上）玄武岩段，均由熔岩和少量火山碎屑组成。选择三个样品进行K-Ar测年。来自高影原玄武岩段的样本是研究区最年轻的熔岩，显示 2.67 + - 23 马，而来自净房寺安山岩段的另外两个样本显示 6.52 + - 0.26 马和 6.95 + - 0.26 马.包括上述样本在内的所有稻宁和岳火山岩的特征是极低的K_2O组，就像来自三泷和黑花山的其他中新世晚期至上新世火山岩一样， 日本东北弧的南部。这些第三纪火山岩在成分上以玄武岩和玄武岩安山岩为主，其K_2O含量明显低于火山前沿的第四纪火山。这些极低K的火山活动与日本东北部弧的许多泰特中新世至上新世火山口的形成同时发生。

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