Tectonic controls of Late Cenozoic monogenetic intraplate volcanism at the Wulanhada volcanic field, Northern China

Tectonic controls of Late Cenozoic monogenetic intraplate volcanism at the Wulanhada volcanic field, Northern China
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中国北方乌兰哈达火山田晚新生代单成因板内火山作用的构造控制

DOI:
10.1016/j.jvolgeores.2018.01.022
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发表时间:
2018-01
影响因子:
2.9
通讯作者:
李霓
李霓
中科院分区:
地球科学3区
文献类型:
--
作者:
赵勇伟;樊祺诚;Zou Haibo;李霓

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印度-欧亚碰撞和西太平洋俯冲在东亚板内火山形成中的作用尚不清楚。乌兰哈达作为一个板内单成因火山岩场,是这一问题的一个很好的研究案例。在乌兰哈达火山区共识别出18座火山和41个喷口,并根据显著的空间排列将其分为3组。地球化学数据显示,这三个组在岩石分类和微量元素模式方面具有相似的特征。因此,这三组火山可以被视为一个火山系统。K-Ar年龄数据表明,西弗吉尼亚火山活动发生在晚中新世,一直持续到第四纪。远离W-G断层的馈线裂缝一般走向ENE-NE,与该地区的最大主压应力一致,而靠近W-G断层的馈线裂缝走向WNW,与该先存断层近平行。基于印度-欧亚大陆碰撞与乌兰哈达火山活动在应力场和补给岩墙方向上的耦合和时间上的一致性,青藏高原构造控制是乌兰哈达火山活动的主导因素。W-G断层是WVF应力集中和火山分布的另一个不可或缺的因素。
The role of India-Eurasian collision and Western-Pacific subduction on the formation of intraplate volcanoes in East Asian is unclear. Wulanhada in North China is a perfect study case for this problem as an intraplate monogenetic volcanic field. We identified 18 volcanoes and 41 vents in Wulanhada volcanic field and divided them into three groups according to notably spatial alignments. Geochemical data show the three groups have similar characteristics in rock classification and trace element patterns. Consequently, the three groups of volcanoes could be treated as one volcanic system. Our K-Ar age data indicate that the volcanism in WVF occurred since the late Miocene and lasted until Quaternary. The feeder fractures far from the W-G fault generally strike ENE-NE, consistent with the maximum principal compressive stress of this region, while the feeder fractures near the W-G fault trend WNW, subparallel to this pre-existing fault. Based on the couplings of stress field and feeder dyke in orientation and timing consistency between the India-Eurasian collision and the volcanism at Wulanhada, the tectonic control from the Tibet Plateau is a dominant factor on the volcanism at WVF. The W-G fault is another indispensable factor for concentration of stress and the distribution of volcanoes at WVF.
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