Earth Science Frontiers ›› 2022, Vol. 29 ›› Issue (2): 28-44.DOI: 10.13745/j.esf.sf.2022.2.5

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Distinctive spatial-temporal evolution of Late Paleozoic to Mesozoic magmatic systems in Northeast Asia: Evidences for identification of the extent and superposition of multiple plate tectonic regimes

WANG Tao1,2,*(), ZHANG Jianjun1,3,*(), LI Shan1,3, TONG Ying1,2,3, GUO Lei1,3, ZHANG Xiaowei3, HUANG He1,3, ZHANG Lei1,3, XUE Huaimin3   

  1. 1. Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources, Beijing 100037, China
    2. Beijing SHRIMP Center, Beijing 100037, China
    3. Institute of Geology, Chinese Academy of Geological Sciences, Beijing 100037, China
  • Received:2022-02-03 Revised:2022-02-27 Online:2022-03-25 Published:2022-03-31
  • Contact: WANG Tao,ZHANG Jianjun

Abstract:

The tectonic evolution of Northeast Asia has experienced the collision and post-collision processes of the Paleo-Asian Ocean, the Mongol-Okhotsk Ocean and the Paleo-Pacific Ocean. However, the spatial-temporal distribution ranges and overlapping processes of these three tectonic regimes have long been difficult to constrain properly. In this paper, we analyzed the spatial-temporal migration patterns of Late Paleozoic-Mesozoic magmatic rocks of Northeast Asia through the constructions of U-Pb age data of giant magmatic belts and a series of data-driven digital maps, with the aim to constrain the tectonic superimposition of the three tectonic regimes. We determined that the extent of each tectonic domain varies in different periods. During the Permian to Jurassic, Paleo-Asian Ocean experienced subduction and collision, which affected mainly the Alxa-northern margin of North China Craton-Da Hinggan Mountains areas; while the Okhotsk Ocean was mainly a continental margin environment, and its influence was initially limited to the central and northern Mongolia and areas around Baikal and then gradually extended to the Mongol-Okhotsk main suture zone in the Jurassic. In the Cretaceous, the Okhotsk Ocean orogenic belt extended and collapsed, which further expanded its influence, with its long-range effect reaching the areas affected by the Paleo-Asian Ocean. Meanwhile, the Paleo-Pacific tectonic system mainly developed in the Triassic to Jurassic, and its plate subduction reached the Da Hinggan-Taihang Mountains area-a gravity gradient zone in the eastern Asian continent, with its long range effect subsequently reaching the easternmost margin of the eastern Asian continent due to the subducting plate retreating during the Cretaceous. Thus, these processes of were superimposed on the products of the Paleo-Asian Oceanic system, together with these of the Mongol-Okhotsk Oceanic system, they all superimposed mainly on the Da Hinggan Mountains region.

Key words: spatial-temporal distribution of magmatism, tectonic superimposition, Mongol-Okhotsk regime, Circum-Pacific regime, Paleo-Asian Ocean regime, magmatic migration, Northeast Asia

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