Isotopic ages of the Shinzan Rhyolites, Oga Peninsula, NE Japan

Isotopic ages of the Shinzan Rhyolites, Oga Peninsula, NE Japan
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日本东北部男鹿半岛新山流纹岩的同位素年龄

DOI:
10.3720/japt.72.608
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发表时间:
2007
期刊:
Journal of The Japanese Association for Petroleum Technology
影响因子:
--
通讯作者:
T. Ohguchi
T. Ohguchi
中科院分区:
--
文献类型:
--
作者:
K. Kano;Yudai Sato;Norihiko Kobayashi;K. Ogasawara;T. Ohguchi

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新山流是门前组的最上部,不协调地覆盖着同一组的卡莫熔岩。从卡莫熔岩和相关的Kuguriiwa熔岩到新山流的火山序列已被接受,同位素年龄范围为34 - 24 Ma,新山流与下面的两个单元之间有200 - 300万年的大时间差。本文报道了新山流的同位素年龄。黑云母的Ar-Ar和K-Ar定年及Ca.锆石裂变径迹测年为37 Ma。对卡莫熔岩中的长英质熔结凝灰岩进行了新的裂变径迹测年。36 Ma.这些新的年龄数据是相互一致的,比以往报道的同位素年龄可靠得多,并明显表明:1)门前组的年龄是晚始新世至早渐新世; 2)新山流和卡莫拉瓦斯之间的时间间隔应远远小于或忽略不计的整个火山序列的时间跨度。新山流的主要部分比浅海盐濑之岬砂岩和砾岩(34-36 Ma)稍年轻,可能表明晚始新世至早渐新世裂谷的先例,日本海的快速开放。
The Shinzan Rhyolites are the uppermost part of the Monzen Formation and discordantly cover the Kamo Lavas of the same formation. The volcanic succession from the Kamo Lavas and correlative Kuguriiwa Lavas to the Shinzan Rhyolites has been accepted to range in isotopic age from 34 Ma to 24 Ma with a large time gap of 2 or 3 million years between the Shinzan Rhyolites and the underlying two units. This paper reports new isotopic ages of the Shinzan Rhyolites, ca. 34 Ma by Ar-Ar and K-Ar dating of biotite and ca. 37 Ma by fission-track dating of zircon. A new fission-track date of the welded felsic tuff from the Kamo Lavas is ca. 36 Ma. These new age data are mutually consistent and much more reliable than the ever-reported isotopic age, and obviously indicate that 1) the Monzen Formation is to be Late Eocene to Early Oligocene in age and 2) the time gap between the Shinzan Rhyolites and the Kamo Lavas should be much smaller than or negligible relative to the time span of the entire volcanic succession. The main part of the Shinzan Rhyolites would be slightly younger than the shallow marine Shiose-no-misaki Sandstone and Conglomerate (34-36 Ma) and perhaps demonstrates the Late Eocene to Early Oligocene rifting precedent to the rapid opening of the Japan Sea.
日本东北部男鹿半岛年龄超过 20 Ma 的海洋沉积物。(日语,英文摘要)
DOI: --
发表时间: 2005
期刊: Journal of the Japanese Association for Petroleum Technology vol.70
影响因子: --
作者:
Ohguchi;T.;Yamazaki;S.;Noda;H.;Sasaki;K. and Kano;K.
通讯作者: K.
日本海东部始新世至渐新世演替的起始学回顾:对日本海早期开放的影响。
DOI: --
发表时间: 2006
期刊: Journal of Asian Earth Sciences Doi:10.1016
影响因子: --
作者:
Kano;K.;Ohguchi;T.;Uto.K.
通讯作者: Uto.K.
最近的深地震剖面揭示了日本本州中北部弧后地区的晚新生代构造发育。
DOI: --
发表时间: --
期刊: Jour.Japanese Assoc.Petro.Tech(in Japanese with English abstract) 69
影响因子: --
作者:
Sato;H.;Yoshida;T.;Iwasaki;T.;Sato;T.;Ikeda;Y.;N.Umino
通讯作者: N.Umino