The relationship between plutonic and volcanic components of magmatic plumbing systems continues to be a question of intense debate. The Oki-Dōzen Islands, Sea of Japan, preserve outcrops of temporally associated plutonic, hypabyssal, and volcanic rocks. Post-intrusion uplift juxtaposed Miocene syenites in inferred faulted contact with volcanic trachytes that are cut by rhyolite hypabyssal dikes. This provides a window deep into the timing and origins of magma storage architecture and dynamics. Zircon is ubiquitous in all samples; our aim is to determine what its age and composition can reveal about the plutonic-volcanic connection. Here we show magma source characteristics are recorded in zircon Hf isotopes; source composition and assimilation of heterogeneous hydrothermally altered crust in zircon O isotopes; and extensive fractional crystallization in zircon trace elements. Combined with new UTh-Pb SHRIMP zircon ages, 6.4–5.7 Ma, compositional data show pluton formation was by protracted amalgamation of discrete magma pulses. The rhyolite dike preserves an evolved fraction segregated from these discrete magmas. Synchronous with plutonism was a volcanic eruption of trachyte magma derived from the same source, which may have stalled at a relatively shallow depth prior to eruption. Stalling occurred at least above the amphibole stability zone because amphibole-compatible Sc and Ti were not depleted in the trachyte melt resulting in elevated values of these in volcanic compared to plutonic zircon. Identifying smaller episodic magma pulses in a larger magmatic complex places constraints on potential magma fluxes and eruptible volumes. High-flux, large volume, plume-related ocean island magmatic systems may have extensive vertically distributed multi-stage magmatic reservoirs and subduction-related systems transcrustal magma reservoirs. By contrast, Oki-Dōzen was a low-flux system with incremental pluton growth and small- to moderate-scale eruptions.

中文翻译：

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锆石地质年代学和地球化学对深成体构造和火山-下海底-深成体联系的见解：日本海冲道前——复杂的板内碱性火山

岩浆管道系统的深成和火山成分之间的关​​系仍然是一个激烈争论的问题。日本海的隐岐岛保留了与时间相关的深成岩、浅海层和火山岩的露头。侵入后隆起与中新世正长岩并列，推断断层接触与被流纹岩下浅水岩脉切割的火山粗面岩。这为深入了解岩浆存储架构和动态的时间和起源提供了一个窗口。锆石普遍存在于所有样品中；我们的目标是确定它的年龄和成分可以揭示深成火山-火山的联系。在这里，我们展示了以锆石 Hf 同位素记录的岩浆源特征；锆石O同位素非均质热液蚀变地壳的来源组成与同化；锆石微量元素中广泛的分级结晶。结合新的 UTh-Pb SHRIMP 锆石年龄（6.4-5.7 Ma），成分数据表明，岩体的形成是由离散岩浆脉冲的长期合并造成的。流纹岩脉保留了与这些离散岩浆分离的演化部分。与深成作用同步的是来自同一来源的粗面岩岩浆的火山喷发，该喷发可能在喷发前相对较浅的深度停止。失速至少发生在闪石稳定区上方，因为与闪石相容的 Sc 和 Ti 在粗面岩熔体中没有耗尽，导致火山岩中的这些值与深成岩锆石相比升高。在较大的岩浆复合体中识别较小的偶发岩浆脉冲会限制潜在的岩浆通量和可喷发量。高通量，大体积、与羽流相关的洋岛岩浆系统可能具有广泛的垂直分布的多级岩浆储层和与俯冲相关的系统跨地壳岩浆储层。相比之下，Oki-Dōzen 是一个低通量系统，具有增量的岩体生长和小到中等规模的喷发。