Accretionary complexes in the Asia-Pacific region: Tracing archives of ocean plate stratigraphy and tracking mantle plumes |
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| Affiliation: | 1. Institute of Geology and Mineralogy SB RAS, Koptyuga ave. 3, Novosibirsk 630090, Russia;2. Division of Interdisciplinary Science, Faculty of Science, Kochi University, Akebono-cho, Kochi 780-8520, Japan;3. School of Earth Sciences and Resources, China University of Geosciences Beijing, No. 29 Xueyuan Road, Haidian District, Beijing 100083, China;1. College of Earth Sciences, Jilin University, Changchun 130061, China;2. State Key Laboratory of Geological Processes and Mineral Resources, China University of Geosciences, Wuhan 430074, China;1. Earth-Life Science Institute, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152–8550, Japan;2. Department of Earth and Planetary Sciences, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152–8550, Japan;3. Graduate School of Arts and Sciences, The University of Tokyo, Komaba 3-8-1, Meguro, Tokyo 153–8902, Japan;4. Department of Geology, The University of Leicester, Leicester LE1-7RH, UK;1. Department of Earth and Planetary Science, Tokyo Institute of Technology, O-okayama 2-12-1, Meguro, Tokyo 152-8551, Japan;2. Division of Earth and Planetary Sciences, Graduate School of Science, The University of Kyoto Yoshidahoncho, Sakyo-ku, Kyoto 606-8501, Japan;3. Earth-Life Science Institute, Tokyo Institute of Technology, 2-12-1, O-okayama, Meguro-ku, Tokyo, Japan |
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| Abstract: | The accretionary complexes of Central and East Asia (Russia, Kazakhstan, Kyrgyzstan, Tajikistan, Mongolia, and China) and the Western Pacific (China, Japan, Russia) preserve valuable records of ocean plate stratigraphy (OPS). From a comprehensive synthesis of the nature of occurrence, geochemical characteristics and geochronological features of the oceanic island basalts (OIB) and ophiolite units in the complexes, we track extensive plume-related magmatism in the Paleo-Asian and Paleo-Pacific Oceans. We address the question of continuous versus episodic intraplate magmatism and its contribution to continental growth. An evaluation of the processes of subduction erosion and accretion illustrates continental growth at the active margins of the Siberian, Kazakhstan, Tarim and North China blocks, the collision of which led to the construction of the Central Asian Orogenic Belt (CAOB). Most of the OIB-bearing OPS units of the CAOB and the Western Pacific formed in relation to two superplumes: the Asian (Late Neoproterozoic) and the Pacific (Cretaceous), with a continuing hot mantle upwelling in the Pacific region that contributes to the formation of modern OIBs. Our study provides further insights into the processes of continental construction because the accreted seamounts play an important role in the growth of convergent margins and enhance the accumulation of fore-arc sediments. |
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