Forearc basins preserve the geologic record relating strictly to arc magmatism. The provenance of forearc sediment can be used to differentiate periods of crustal growth, accretion, and destruction, enhanced magmatism, advancing and retreating subduction slabs, delamination, etc. These tectonic systems predict differing degrees of sedimentary reworking of the older forearc units. Additionally, Hf isotopes of zircon can be used to evaluate the degree of continental reworking that occurs in the arc system. In this paper, we evaluate the changes in a long-lived subduction system using detrital zircon U-Pb and Hf-isotope data from forearc units in northern Honshu, Japan that span in age from the Silurian Period to the present from the forearc provenance of the Japanese subduction system. Our data demonstrate a series of dominant age peaks (430 ± 20, 360 ± 10, 270 ± 20, 184 ± 12, 112 ± 22, and 7 ± 7 Ma) and a progressive loss of the older zircon populations. Zircon Hf-isotope data reveal three discrete shifts that correspond to differing degrees of isotopic enrichment and correlate with changes in the dominant zircon age peaks. Additionally, each temporal isotopic shift is associated with isolation of the older sedimentary packages wherein no detrital zircon from the previous stages are observed in subsequent stages. We propose these shifts provide evidence for rapid shifts in arc tectonics including magmatic flare-ups, producing the dominant peaks; protracted tectonic erosion progressively removing older sources of zircon reveals a late Carboniferous event triggering the complete removal of the Precambrian crust; and the Cretaceous melting of the entire Permian arc crust, likely related with the subduction of the mid-oceanic ridge separating the Izanagi and Pacific plates.

前额盆地保留了严格与弧岩浆作用有关的地质记录。前臂沉积物的来源可用于区分地壳的生长，增生和破坏，增强的岩浆作用，俯冲板块的进退和撤离，分层等。这些构造系统可预测较早的前臂单元的沉积再造程度不同。此外，锆石的Hf同位素可用于评估电弧系统中发生的大陆返工程度。在本文中，我们使用日本本州北部前陆单元的碎屑锆石U-Pb和Hf同位素数据评估了志留纪时期至现在的碎屑锆石U-Pb和Hf同位素数据，评估了长寿命俯冲系统的变化。日本的俯冲系统。我们的数据表明，一系列主要的年龄高峰（430±20，360±10、270±20、184±12、112±22和7±7 Ma），并逐渐丧失较老的锆石种群。锆石Hf同位素数据揭示了三个离散的位移，分别对应于不同程度的同位素富集，并与主要锆石年龄峰的变化相关。另外，每个时间上的同位素位移都与较老的沉积物包被隔离有关，其中在随后的阶段中没有观察到来自先前阶段的碎屑锆石。我们认为这些变化为电弧构造的快速变化提供了证据，包括岩浆爆发，产生了主要的峰值。长期的构造侵蚀逐渐清除了较旧的锆石资源，表明晚石炭纪事件触发了前寒武纪地壳的完全清除。整个二叠纪弧壳的白垩纪融化，