Multi-chronology of volcanic rocks leading to reliable age estimates of volcanic activity: an example from the Setouchi volcanic rocks on Shodo-Shima Island, SW Japan

Multi-chronology of volcanic rocks leading to reliable age estimates of volcanic activity: an example from the Setouchi volcanic rocks on Shodo-Shima Island, SW Japan
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火山岩的多年代学可对火山活动进行可靠的年龄估计:以日本西南部小豆岛濑户内火山岩为例

DOI:
10.5575/geosoc.116.661
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发表时间:
2010
期刊:
Journal of the Geological Society of Japan
影响因子:
--
通讯作者:
D. Dunkley
D. Dunkley
中科院分区:
--
文献类型:
--
作者:
Y. Tatsumi;K. Tani;Keiko Sato;T. Danhara;H. Hyodo;H. Kawabata;T. Hanyu;D. Dunkley

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采用全岩和矿物K-Ar、Ar-Ar、锆石裂变径迹和锆石U-Pb等方法,对日本西南部小豆岛两个中新世不同地层的四个濑户内火山岩样品进行了多年代学测定,以更好地估算其喷发年龄。对结果的统计和年代学分析表明,下部和上部地层形成于14。三比十四4马和13。1 - 13号。4 Ma,这与地质关系是一致的。U-Pb测年法倾向于为岩浆锆石的分析提供可靠的喷发年龄,如果样品基本上没有热蚀变,则裂变径迹测年法适用于确定喷发年龄。根据Ar-Ar坪和K-Ar年龄数据,需要仔细检查老基底岩石和蚀变的贡献,以限制喷发年龄。普遍存在的捕虏晶锆石,即使在最少分化的高镁安山岩,表明在岩浆中的先存地壳的参与。这些锆石的U-Pb年龄反映了晚白垩世花岗岩基底的参与,以及更古老的成分。
Four samples of the Setouchi volcanic rocks from two different Miocene formations on Shodo-Shima Island, SW Japan, were dated multi-chronologically using whole-rock and mineral K-Ar and Ar-Ar, zircon fission-track, and zircon U-Pb techniques, in order to better estimate their eruption ages. Statistical and chronological analyses of the results suggest that the lower and upper formations formed at 14 . 3 - 14 . 4 Ma and 13 . 1 - 13 . 4 Ma, respectively, which is consistent with geological relationships. U-Pb dating tends to show a reliable eruption age for analyses of magmatic zircon, and fission-track dating is suitable for determining the eruption age if the sample is largely free of thermal alteration. A careful examination of the contribution of old basement rocks and alteration is required to constrain the eruption age based on Ar-Ar plateau and K-Ar age data. The ubiquitous occurrence of xenocrystic zircon, even in the least-differentiated high-Mg andesite, indicates the involvement of pre-existing crust in the magma. The U-Pb ages of these zircons reveal the involvement of Late Cretaceous granitic basement, as well as older components.
日本沿中线构造线的大规模位移:来自南北上和古 Ryoke 地带的花岗岩和片麻岩的 SHRIMP 锆石 U-Pb 定年证据
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