2023
DOI: 10.3390/min13050606
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Closure of the Eastern Paleo-Asian Ocean: Evidence from Permian–Triassic Volcanic Rocks in the Northern Margin of the North China Craton

Abstract: The Central Asian Orogenic Belt (CAOB) is the world’s largest accretionary orogenic belt, and its formation is related to the closure of the Paleo-Asian Ocean (PAO). However, the closure time and style of the PAO remain controversial. To address these issues, this paper presents zircon U-Pb dating, whole-rock geochemistry and zircon Lu-Hf isotope analyses of the volcanic rocks in the Faku-Kaiyuan area on the northern margin of the North China Craton. The results show that the Bachagou andesites formed in the E… Show more

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“…The SGXR is located in the central section of the Songnen-Zhangguangcai Range block (SZM, Figure 1a), and four boundaries of the east, west, north, and south are the Nenjiang-Balihan fault, East Ujimqin Banner-Xilinhot belt, Hegenshan fault, and Xar Moron fault, respectively. The SGXR underwent sequential tectonic control from the Paleo-Asian Ocean in the Paleozoic, followed by the Mongol-Okhotsk Ocean and Paleo-Pacific tectonic domains in the Mesozoic [27,41,42]. These tectonic transitions are documented as intricate geodynamic processes marked by multiple tectonic events.…”
Section: Regional Geologymentioning
confidence: 99%
“…The SGXR is located in the central section of the Songnen-Zhangguangcai Range block (SZM, Figure 1a), and four boundaries of the east, west, north, and south are the Nenjiang-Balihan fault, East Ujimqin Banner-Xilinhot belt, Hegenshan fault, and Xar Moron fault, respectively. The SGXR underwent sequential tectonic control from the Paleo-Asian Ocean in the Paleozoic, followed by the Mongol-Okhotsk Ocean and Paleo-Pacific tectonic domains in the Mesozoic [27,41,42]. These tectonic transitions are documented as intricate geodynamic processes marked by multiple tectonic events.…”
Section: Regional Geologymentioning
confidence: 99%