沿东北亚大陆边缘延长的晚期古生物学火山弧活动
Hyeong Soo Kim1, Yong Park2, Min-Ji Jung3
1Department of Earth and Environmental Sciences, Korea University, Seoul, 02841, Republic of Korea.
Scientific reports
|October 30, 2025
概括
在东北亚的一个古老时代晚期的火山弧系统已经通过在韩国的石测年法被确定. 这个现在大部分被侵蚀的系统,为中亚矿产带提供了新的见解.
科学领域:
- 地质地质地质地质地质地
- 构造学 构造学 构造学 构造学
- 地质时间学 (Geochronology)
背景情况:
- 东北亚的复杂构造历史涉及古生代-中生代或原生.
- 后来的变形和岩石化掩盖了这些orogen的原始分布.
研究的目的:
- 为了调查朝鲜东南部的晚期古世火山弧系统的存在和持续时间.
- 了解东北亚和中亚矿产带的构造进化.
主要方法:
- 石榴石和石灰岩的烯U-Pb年代测定.
- 在石中分析氧同位素比率 (δ18O) 和同位素成分 (εHf(t)) 的分析.
主要成果:
- 石芯的年代为278-255万年前,边缘为约250万年前,表明长期存在的火山弧系统.
- 石中氧气的耗尽表明了改变的火山材料的回收.
- 石中的负 εHf (t) 值与弧形相关的前陆盆地沉积物有关.
结论:
- 长期存在的古老时代晚期火山弧系统存在于东北亚,现在大部分被侵蚀.
- 结合来自中国北部和日本的数据,这些发现完善了中亚矿产带的配置.
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