Repeated metamorphism in the pelitic granulites of the Hidaka metamorphic belt, Hokkaido, Japan: Implications for the formation of the present-day trench-arc-basin system in NE Asia

IF 3.5 2区 地球科学 Q1 GEOLOGY
Jinrui Zhang, Wenliang Xu, Yu Dong, Zheng Ji, Chunjing Wei, Shuang Tang, Yibing Li, Kiyoaki Niida
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引用次数: 2

Abstract

The timing and mechanism of the tectonic transition from an active continental margin to a trench-arc-basin system in NE Asia are debated. In this study, we report the pressure–temperature–time (PTt) path of this transition based on petrographic observations, phase-equilibrium modelling, and U–Pb ages of zircon and rutile from pelitic granulites in the Hidaka metamorphic belt (Hokkaido, Japan). The granulites contain an early phase mineral assemblage of staurolite + sillimanite + biotite + plagioclase + quartz + rutile/ilmenite, a peak phase granulite assemblage of garnet + biotite + cordierite + plagioclase + quartz + rutile/ilmenite and a symplectic intergrowth of spinel + cordierite ± sillimanite within garnet porphyroblasts. Phase-equilibrium modelling indicates two phases of metamorphism with PT conditions, respectively, of ~6 kbar/620–670°C and ~6 kbar/850°C. A clockwise PT path was thus reconstructed for the granulites, showing a near-isobaric temperature increase to the peak conditions and a post-peak cooling. U–Pb dating of zircon and rutile in the granulites yielded two groupings of metamorphic ages at c. 37 Ma and 19 Ma, related to early phase amphibolite facies and late phase granulite facies metamorphism, respectively. The age of magmatism from the previous work at the NE Asian continental margin overlaps with these metamorphic ages, and the two phases of metamorphism in the pelitic granulites is attributed to discrete episodes of supra-subduction-zone magmatism (late Eocene, c. 37 Ma) and back-arc extension (early Miocene, 24–19 Ma). Consequently, we suggest that the Hidaka metamorphic belt has undergone two phases of metamorphism, which represent two pulsed and separated thermal events. Moreover, we relate the granulites facies metamorphism to the underplating of mafic magma and lithospheric thinning during the opening of the Japan Sea at 24–19 Ma, which is attributed to slab rollback and trench retreat processes in NE Asia.

日本北海道Hidaka变质带泥质麻粒岩的重复变质作用:对现今东北亚槽弧盆地系统形成的影响
对东北亚从活动大陆边缘向沟弧盆地系统的构造转变的时间和机制进行了讨论。在本研究中,我们根据岩相观察、相平衡建模以及Hidaka变质带(日本北海道)泥质麻粒岩锆石和金红石的U–Pb年龄,报告了这种转变的压力-温度-时间(P–T–T)路径。麻粒岩包含一个早期的十字石矿物组合 + 硅线石 + 黑云母 + 斜长石 + 石英 + 金红石/钛铁矿&石榴石的峰相麻粒岩组合 + 黑云母 + 堇青石 + 斜长石 + 石英 + 金红石/钛铁矿与尖晶石的辛共生 + 堇青石 ± 石榴石斑岩中的硅线石。相平衡模型表明变质作用的两个阶段,P–T条件分别为~6 kbar/620–670°C和~6 kbar/850°C。因此,重建了麻粒岩的顺时针P–T路径,显示出接近等压的温度上升到峰值条件和峰后冷却。麻粒岩中锆石和金红石的U–Pb测年在c.37产生了两组变质年龄 马和19 Ma,分别与早期角闪岩相和晚期麻粒岩相变质作用有关。东北亚大陆边缘先前工作的岩浆作用年龄与这些变质年龄重叠,泥质麻粒岩的两个变质阶段归因于超俯冲带岩浆作用的离散事件(始新世晚期,c.37 Ma)和弧后伸展(早中新世,24-19 马)。因此,我们认为Hidaka变质带经历了两个变质阶段,代表了两个脉冲和分离的热事件。此外,我们将麻粒岩相变质作用与24-19日本海开放期间镁铁质岩浆的底侵作用和岩石圈变薄联系起来 Ma,这归因于东北亚的板块后退和海沟后退过程。
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来源期刊
CiteScore
6.60
自引率
11.80%
发文量
57
审稿时长
6-12 weeks
期刊介绍: The journal, which is published nine times a year, encompasses the entire range of metamorphic studies, from the scale of the individual crystal to that of lithospheric plates, including regional studies of metamorphic terranes, modelling of metamorphic processes, microstructural and deformation studies in relation to metamorphism, geochronology and geochemistry in metamorphic systems, the experimental study of metamorphic reactions, properties of metamorphic minerals and rocks and the economic aspects of metamorphic terranes.
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