Trace element and helium isotope geochemistry of the Cenozoic intraplate volcanism in the East Sea (Sea of Japan): Implications for lithosphere-asthenosphere interaction

Lee, Wonhee; Lee, Hyun–Woo; Kim, Dong Hwan; Kim, Jonguk; Oh, Jihye; Song, Jung‐Hun; Kim, Chang Hwan; Park, Chan Hong; Stuart, Finlay M.

doi:10.1016/j.lithos.2021.106075

Cited by 8 publications

(1 citation statement)

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“…The ancient lithospheric mantle was metasomatized by slab‐derived hydrous fluids that would convert the ancient lithospheric mantle to the Mesozoic enriched lithospheric mantle (Ma et al, 2014; Zhang, Guo, et al, 2021; Zhang, Zheng, et al, 2021). However, due to the deep subduction of the Pacific Plate and its stagnancy in the transition zone, the depleted asthenospheric mantle beneath the eastern margin of the Eurasian Plate upwelled, decompression melted and formed a series of volcanic rocks in Northeast Asia during the Miocene with the depleted geochemical characteristics (Lee et al, 2021; Wang, Santosh, Yang, Nakagawa, & Dong, 2020; Yamamoto & Hoang, 2009; Yu et al, 2018; Zhao, 2021; Zou, Fan, & Yao, 2008). Hence, the Marzheng diorites may derive from the depleted asthenospheric mantle and might have experienced fractional crystallization during the ascent of the mafic magmas.…”

Section: Discussionmentioning

confidence: 99%

Geochemistry, geochronology, and Hf isotope of diorites in the Marzheng area: Implications for the Early Palaeozoic tectonic evolution of the East Kunlun Orogenic Belt

et al. 2022

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The East Kunlun Orogenic Belt (E-KOB) of the northern Tibetan Plateau is an accretionary orogenic belt, which has experienced complicated tectonic evolutionary processes of the Proto-to Palaeo-Tethys Ocean. The Muztagh-Buqingshan-Anemaqen ophiolitic mélange zone (MBAM) is an accretionary complex related to the northward subduction of the Tethyan Ocean. Numerous intrusions outcropped in MBAM have witnessed the long-term subduction-accretionary process and thus site the key to comprehending the tectonic evolution of the E-KOB, as well as the Tethyan Ocean.In this study, petrological, geochronological, and geochemical studies of the Marzheng diorites in the MBAM were carried out to explore the Early Palaeozoic tectonic evolution of the E-KOB. Zircon U-Pb dating analysis suggests that the diorites were formed in the Early Ordovician at ca. 470 Ma. Furthermore, the ε Hf (t) values (5.3-14.1), Mg # values (39.7-51.2), and Nb/Ta (12.8-14.8), Zr/Hf (33.8-44.8), and Lu/Yb (0.15-0.16) ratios are generally close to those of depleted mantle-derived rocks and the diorites were originated from a depleted asthenosphere mantle source. In addition, these diorites are characterized by enriched light rare earth elements (LREEs) (La and Nd) and depleted high-field-strength elements (HFSEs) (Nb, Ta, P, and Ti), similar to the fingerprints of arc-related gabbroic-dioritic rocks. This is also consistent with their high H 2 O melt (6.0-8.3%) and oxygen fugacity (logfO 2 = À14.3 to À13.5) features, indicating that they were formed in a subduction-related setting. Our new investigations suggest that the Proto-Tethys Ocean in the East Kunlun was still actively subducting northward during the Early Ordovician.

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