Zircon U–Pb ages of the Higo plutonic complex: Implication for migration of Cretaceous igneous activity in Kyushu, southwest Japan

IF 1 4区 地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY
Island Arc Pub Date : 2022-04-20 DOI:10.1111/iar.12446
Yukiyasu Tsutsumi
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引用次数: 1

Abstract

Zircon U–Pb weighted mean ages of seven samples from the Higo plutonic complex (HPC) in Kyushu were determined as follows; Shiraishino granodiorite: 109.3 ± 0.9 Ma and 109.0 ± 1.1 Ma; Kugushima granodiorite: 109.1 ± 1.1 Ma; Miyanohara tonalite: 107.7 ± 1.3 Ma and 108.3 ± 0.9 Ma; Manzaka tonalite: 108.0 ± 0.9 Ma; Joyama tonalite: 112.7 ± 1.2 Ma. The plutonism of batholithic granitoids in the HPC occurred in 109–108 Ma, and granitic intrusions occurred in 113 Ma. The previously reported zircon U–Pb ages range from 107 to 98 Ma in northern Kyushu and concentrate around about 106 Ma in the Chikuhi area in the northern part of central Kyushu. The previously published age data and newly obtained data in this study demonstrate that Cretaceous igneous activity in Kyushu migrated northward from 114 to 98 Ma, accompanied by widespread igneous activity throughout central and northern Kyushu at 106–105 Ma. The HPC situated in the southernmost part of central Kyushu was the origin of this northward migration.

东古深部杂岩体锆石U-Pb年龄:日本西南部九州地区白垩纪火成岩活动的迁移意义
对九州东古深部杂岩(HPC) 7个样品的锆石U-Pb加权平均年龄进行了测定;白石野花岗闪长岩:109.3±0.9 Ma和109.0±1.1 Ma;久岛花岗闪长岩:109.1±1.1 Ma;宫原岩:107.7±1.3 Ma和108.3±0.9 Ma;曼扎卡石英:108.0±0.9 Ma;Joyama tone: 112.7±1.2 Ma。HPC中底石器时代花岗岩类的深部成矿作用发生在109 ~ 108 Ma,花岗岩侵入作用发生在113 Ma。前人报道的九州北部锆石U-Pb年龄在107 ~ 98 Ma之间,九州中部北部的Chikuhi地区锆石U-Pb年龄集中在106 Ma左右。前人发表的年龄资料和本研究新获得的资料表明,在114 ~ 98 Ma期间,九州白垩系火成岩活动向北迁移,在106 ~ 105 Ma期间,九州中部和北部广泛存在火成岩活动。位于九州中部最南端的HPC是这次北迁的起源。
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来源期刊
Island Arc
Island Arc 地学-地球科学综合
CiteScore
2.90
自引率
26.70%
发文量
32
审稿时长
>12 weeks
期刊介绍: Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.
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