ESR dating of volcanic and baked rocks
ESR dating of volcanic and baked rocks
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火山岩和烘烤岩的 ESR 测年
DOI：
10.1016/0277-3791(88)90057-1
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发表时间：
1988
影响因子：
4
通讯作者：
A. Moriyama
中科院分区：
文献类型：
--
作者：
K. Shimokawa;N. Imai;A. Moriyama
日本中部山区发育上新世至更新世火山岩。我们用电子自旋共振（ESR）测定了岩石的年龄。其中花岗岩（IK）和沉积物（UN）为玄武岩熔岩流烘烤的产物，其K氩年龄为1.4 ~ 2.0 Ma，长英质火山碎屑流沉积（TK， NM）。从所有样品中提取的石英颗粒中都发现了铝中心。IK和UN石英中Al中心的ESR年龄分别为0.77和1.3 Ma。英安岩火山碎屑流沉积（NM）的ESR年龄为0.37 Ma，与同一地区的英安岩熔岩相关，其KAr年龄为0.5±0.1 Ma。从Al中心和Ti中心测定TK的ESR年龄分别为0.084和0.098 Ma。
Volcanic rocks of Pliocene to Pleistocene age are developed in the mountainous region of the central part of Japan. We determined the age of the rocks by electron spin resonance (ESR). Four specimens were dated: granite (IK) and sediment (UN) which were baked by basalt lava flows whose KAr age was reported to be 1.4–2.0 Ma, and felsic pyroclastic flow deposits (TK, NM). The Al centre is found in quartz grains extracted from all samples. The ESR ages of 0.77 and 1.3 Ma are obtained from the Al centre in quartz of IK and UN, respectively. The dacitic pyroclastic flow deposit (NM) whose ESR age is obtained to 0.37 Ma, seems to be correlated with dacite lava in the same region, whose KAr age is 0.5 ± 0.1 Ma. The ESR ages of TK are determined as 0.084 and 0.098 Ma from the Al and Ti centres, respectively.