Fission track ages of some granitic rocks in the Outer Zone of Kyushu, Japan
Fission track ages of some granitic rocks in the Outer Zone of Kyushu, Japan
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日本九州外带部分花岗岩裂变径迹年龄
DOI：
10.2465/ganko1941.80.406
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
M. Miyachi
中科院分区：
文献类型：
--
作者：
M. Miyachi
用外探测法测定了九州外带4个花岗岩体的10个锆石裂变径迹年龄。年龄分别为13.1±0.8、13.3±0.8、13.6±1.1、13.7±1.1、13.9±1.1、14.0±1.1；Yama花岗岩：Ichifusayama花岗岩，12.0±0.9m.Y.；十比三花岗岩，12.3±1.0m.Y.12.7±1.2m.y。这些裂变径迹年龄表明，这四个花岗岩体实际上同时冷却。这里还用群体法确定了大美花岗岩的一个磷灰石裂变径迹年龄。磷灰石年龄为12.0±2.6m.y。与锆石裂变径迹年龄基本一致，表明大须岛花岗岩在12英里左右快速冷却。那是以前的事了。
Ten zircon fission-track ages from four granitic bodies in the Outer Zone of Kyushu have been determined by the external detector method. The ages are as follows: Osumi granite, 13.1±0.8m.y., 13.3±0.8m.y., 13.6±1.1m.y., 13.7±1.1m.y., 13.9±1.1m.y., and 14.0±1.1m.y.; Takakuma. yama granite, 12.9±1.0m.y.: Ichifusayama granite, 12.0±0.9m.y.; and Shibisan granite, 12.3±1.0m.y. and 12.7±1.2m.y. These fission-track ages indicate that the four granitic bodies cooled at virtually the same time. One apatite fission-track age of the Osumi granite has also been determined here, using a population method. The apatite age of 12.0±2.6m.y. is almost the same as zircon fission-track age, showing that the Osumi granite cooled rapidly around 12m.y. ago.