Spatiotemporal Distribution of Seamount Volume along the Kyushu-Palau Ridge: Implications for Rejuvenated Volcanism
Spatiotemporal Distribution of Seamount Volume along the Kyushu-Palau Ridge: Implications for Rejuvenated Volcanism
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九州-帕劳海脊沿线海山体积的时空分布：对火山活动复兴的影响
DOI：
10.1016/j.jseaes.2022.105391
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发表时间：
2022-09
影响因子：
3
通讯作者：
Bryan Riel
中科院分区：
文献类型：
--
作者：
Hanghang Ding;Weiwei Ding;Yanghui Zhao;Bryan Riel
•海山火山作用的精确量化揭示了九州-帕劳山脊沿线的多相火山作用。•前渐新世岩石圈弱带靠近海山体积的高浓度，表明构造继承促进了岩浆的迁移。•渐新世期间，与扩张的弧后扩张有关的火山活动恢复了活力，促进了九州-帕劳山脊的发展。KPR从原伊豆-波宁-马里亚纳（IBM）弧分裂，后弧在~ 30 Ma扩展。尽管大多数海山已经确定了年代，但驱动KPR火山弧演化的因素仍然未知。在本研究中，我们量化了KPR沿线海山体积的时空分布，作为火山喷发的定量指标。采用基于白顶帽变换的空间滤波方法从水深图中识别海山。结合地震资料解释和重力资料反演，估算了KPR沿线海山体积分布。结果表明，海山体积的富集区靠近前渐新世岩石圈弱带，表明构造继承在早期火山弧形成过程中促进了岩浆的迁移。大部分海山年龄小于30 Ma，表明其为渐新世晚期恢复的火山活动。此外，北部和中部海山体积的时空变化与Perce Vela和四国盆地的扩展扩张同步，进一步表明火山活动的恢复是由扩展的弧后扩张驱动的。因此，恢复的火山作用可能是残余火山弧形成的重要因素。
• Accurate quantification of seamount volcanism reveals multiphase volcanism along the Kyushu–Palau Ridge. • The proximity of Pre-Oligocene lithospheric weak zones to high concentrations of seamount volume indicate tectonic inheritance facilitated magma migration. • Rejuvenated volcanism related to the propagated back-arc spreading during Oligocene contributed to the development of the Kyushu-Palau Ridge. The Kyushu-Palau Ridge (KPR) is a remnant arc that initially formed with the subduction of the Pacific plate beneath the West Philippine Sea. The KPR split from the proto-Izu-Bonin-Mariana (IBM) arc with the back-arc spreading at ∼ 30 Ma. Even though most of the seamounts have been dated, the factors that drive the volcanic arc evolution along the KPR remain unknown. In this study, we quantify the spatiotemporal distribution of the seamount volume along the KPR, representing a quantitative indicator of erupted volcanism. A spatial filtering method based on the White Top-Hat Transform is used to identify seamounts from the bathymetry. Combining seismic data interpretation and gravity data inversion, we estimate the seamount volume distribution along the KPR. Results show that high concentrations of the seamount volume are in proximity to pre-Oligocene lithospheric weak zones, indicating that tectonic inheritance has facilitated magma migration during the early-stage volcanic arc generation. Subsequently, the younger than 30 Ma age of the majority of the seamounts suggests a late-stage rejuvenated volcanism in the Oligocene. In addition, the spatiotemporal variations of the seamount volume in the northern and central segments are synchronous with the propagated spreading of the Perce Vela and Shikoku basins, further indicating that the rejuvenated volcanism was driven by the propagated back-arc spreading. Rejuvenated volcanism can thus be an important contributive factor to remnant volcanic arc formation.
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