Paleomagnetic results and K-Ar dating on Miocene rocks in the northern part of Fukui Prefecture, Central Japan
Paleomagnetic results and K-Ar dating on Miocene rocks in the northern part of Fukui Prefecture, Central Japan
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日本中部福井县北部中新世岩石的古地磁结果和 K-Ar 定年
DOI：
10.2465/ganko.85.45
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发表时间：
1990
期刊：
影响因子：
--
通讯作者：
T. Itaya
中科院分区：
文献类型：
--
作者：
T. Nakajima;Y. Sawada;T. Nakagawa;Akiyo Hayashi;T. Itaya
对日本西南部东北部福井县分布的中新世岩石进行了K-Ar年龄测定和古地磁测量。从中新世岩石中获得了 13 个 K-Ar 全岩年龄，范围在 17.1 Ma 至 7.3 Ma 之间，这与其生物地层年龄基本一致。古地磁样本是从其年龄通过同位素或生物地层年龄测定确定的地点获得的。通过应用交变和热退磁来检查它们的稳定性，并证实 17 个地点为我们提供了可靠的古地磁数据。新的古地磁结果与之前发表的结果一起表明，首先，日本西南部在26 Ma至17 Ma期间相对于欧亚大陆顺时针旋转了14°；其次，日本西南部的快速自转在17 Ma左右开始，并在15 Ma停止，导致顺时针旋转36°。快速自转速率为18°/Ma。这种顺时针旋转可以用中新世期间日本西南部与日本海扩张相关的漂移来解释。
K-Ar age determination and paleomagnetic measurement have been carried out on the Miocene rocks distributed in Fukui Prefecture, the northeastern part of Southwest Japan. Thirteen K-Ar whole rock ages ranging between 17.1 Ma and 7.3 Ma were obtained from the Miocene rocks, which are virtually consistent with their biostratigraphic ages. Paleomagnetic samples were obtained from sites whose ages were determined by the isotope or biostratigraphic age-determination. Their stabilities were examined by applying alternating and thermal demagnetization, and it is confirmed that 17 sites give us reliable paleomagnetic data. The new paleomagnetic results, together with those published previously, made clear, first, that Southwest Japan was rotated clockwise through 14° with respect to Eurasia in a period between 26 Ma and 17 Ma, second, that a rapid rotation of Southwest Japan was initiated at about 17 Ma, and ceased at 15 Ma resulting in the 36° clockwise rotation. The rate of the rapid rotation is 18°/Ma. This clockwise rotation can be explained by the drift of Southwest Japan associated with the spreading of the Japan Sea during the Miocene.
DOI：
10.1098/rspa.1953.0064
发表时间：
1953-01-01
影响因子：
--
作者：
FISHER, R
通讯作者：
FISHER, R