Cretaceous Fore-Arc Basin and Its Provenance in Sakhalin, Far East Russia: U-Pb Ages of Detrital Zircons From the Yezo Group

IF 1 4区地球科学 Q4 GEOSCIENCES, MULTIDISCIPLINARY

Island Arc Pub Date : 2024-09-17 DOI:10.1111/iar.12534

Tomohiko Sato, Yukio Isozaki, Yukiyasu Tsutsumi, Yasunari Shigeta, Kazuto Kodama, Takashi Hasegawa

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Abstract

In order to reconstruct the pre-Japan Sea configuration of the Cretaceous arc-trench system, we measured U-Pb ages of detrital zircons in the five sandstone samples from the Yezo Group in Sakhalin using LA-ICP-MS. A sandstone sample from the lowermost horizon (Ai Formation) contains abundant Early Cretaceous (110–100 Ma) zircons with minor amounts of pre-Jurassic ones. Four sandstones from the uppermost (Krasnoyarka Formation) are enriched dominantly in Late Cretaceous (100–66 Ma) grains. The YC1σ ages of these samples are generally consistent with the previous fossil ages; nonetheless, a possible age extension of the Ai Fm up possibly into the Cenomanian was newly suggested. The stepwise younging in peak age of zircons according to the stratigraphy suggests the continuous replacement of arc granitoid exposures in the Cretaceous magmatic arc in the provenance likely developed on the continent side. This secular trend in zircon age spectra of the Yezo Group in Sakhalin is properly correlated with that in Hokkaido and also with that of coeval sandstones in southwest Japan, suggesting a monotonous sedimentation in the fore-arc basin of the Late Cretaceous arc-trench system developed along the Pacific margin, from Sakhalin to southwest Japan for ca. 2500 km in length. Its spatial dimension corresponds to that of the modern representative fore-arc basin in the Java-Sumatra region.

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俄罗斯远东萨哈林白垩纪前弧盆地及其成因：叶佐群碎屑锆石的 U-Pb 年龄

为了重建白垩纪弧沟系统的前日本海构造，我们使用 LA-ICP-MS 测量了萨哈林叶佐组五个砂岩样本中的锆石碎片的 U-Pb 年龄。最下层（Ai Formation）的一个砂岩样本含有大量早白垩世（110-100 Ma）锆石和少量前侏罗纪锆石。最上层（Krasnoyarka 地层）的四块砂岩主要富含晚白垩世（100-66 Ma）的锆石颗粒。这些样本的 YC1σ 年龄与之前的化石年龄基本一致；不过，有新的观点认为，Ai Fm 的年龄可能会延伸到新生代。锆石的峰值年龄随地层的变化而逐步年轻化，这表明白垩纪岩浆弧中的弧状花岗岩露头在大陆一侧可能发育的产状中被不断置换。库页岛夷佐组锆石年龄谱的这种长期趋势与北海道的趋势以及日本西南部同时期砂岩的趋势密切相关，表明晚白垩世弧形海沟系统的前弧盆地沿太平洋边缘发展，从库页岛到日本西南部约 2500 千米长。其长度约为 2500 千米。其空间维度与爪哇-苏门答腊地区具有代表性的现代前弧盆地一致。

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来源期刊

Island Arc 地学-地球科学综合

CiteScore

2.90

自引率

26.70%

发文量

审稿时长

>12 weeks

期刊介绍： Island Arc is the official journal of the Geological Society of Japan. This journal focuses on the structure, dynamics and evolution of convergent plate boundaries, including trenches, volcanic arcs, subducting plates, and both accretionary and collisional orogens in modern and ancient settings. The Journal also opens to other key geological processes and features of broad interest such as oceanic basins, mid-ocean ridges, hot spots, continental cratons, and their surfaces and roots. Papers that discuss the interaction between solid earth, atmosphere, and bodies of water are also welcome. Articles of immediate importance to other researchers, either by virtue of their new data, results or ideas are given priority publication. Island Arc publishes peer-reviewed articles and reviews. Original scientific articles, of a maximum length of 15 printed pages, are published promptly with a standard publication time from submission of 3 months. All articles are peer reviewed by at least two research experts in the field of the submitted paper.