The aira and ata pyroclastic flows and related caldera and depressions in southern Kyushu, Japan
The aira and ata pyroclastic flows and related caldera and depressions in southern Kyushu, Japan
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日本九州南部的艾拉和阿塔火山碎屑流以及相关的破火山口和洼地
DOI：
10.1007/bf02597139
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发表时间：
1966
期刊：
影响因子：
--
通讯作者：
T. Ui
中科院分区：
文献类型：
--
作者：
S. Aramaki;T. Ui
九州南部是一个被许多焊接或未焊接的火山碎屑流（~）沉积物广泛覆盖的地区。其中，最引人注目的是两个较年轻的大型岩席，分别命名为艾拉和阿塔火山碎屑流存款。爱腊火山碎屑流存款占据了鹿儿岛湾的北方端周围的广泛地区。存款的一般分布由MATUMOTO（1943，图版VI）给出。松本认为，爱良火山碎屑流是从位于鹿儿岛湾北方端的喷口喷发出来的，现在隐藏在水下。由于喷发，形成了一个破火山口，他将其命名为艾拉（图1）。Matumoto（1943）也将Ata破火山口命名为Ata破火山口，因为他解释说，九州最南部的一个低压区（图1，表示为ATA）是在Ata火山碎屑[低压]喷发后，由喷口周围的塌陷形成的。本文是我们对艾拉和阿塔火山碎屑流沉积物及相关破火山口和其他类型凹陷的地质学和岩石学研究的初步报告。一个更详细的帐户的一部分已出版elswhere（ARAniA~I和Ul，1966）。图2显示了该地区地质单元的一般序列。
The southern part of Kyushu is an area covered by many extensive sheets of pyroclastic tlow(~) deposits welded or not welded. Among these, two younger, large-scale sheets, here named Aira and Ata pyroclastic flow deposit respectively, are the most conspicuous. The Aira pyroclastic flow deposit occupies a wide area surrounding the northern end of Kagoshima Bay. A general distribution of the deposit is given by MATUMOTO (1943, Plate VI). Matumoto considers that the Aira pyroclastic flows were erupted from a vent located at the northern end of Kagoshima Bay and now concealed below water. As a result of the eruption, a caldera was formed which he named Aira (Fig. 1). Ata caldera was likewise named by MATUMOTO (1943) as he interpreted an area of depression in the southernmost part of Kyushu (Fig. 1, indicated as ATA) was formed by collapse around the vent area just after the eruption of the Ata pyroclastic [lows. This paper is a preliminary report of our study in the geology and petrology of the Aira and Ata pyroclastic flow deposits and related caldera and other types of depressions. Part of a more detailed account has been published elswhere (ARAniA~I and Ul, 1966). In Fig. 2~ the general sequence of geologic units in this area is shown.