WITHDRAWN: Late Paleozoic-Early Mesozoic magmatic history of central Inner Mongolia, China: Implications for the Tectonic Evolution of the Xingmeng Orogenic Belt, the southeastern segment of the Central Asian Orogenic Belt

Abstract

Abstract The tectonic setting and location of the southernmost boundary of the Central Asian Orogenic Belt (CAOB) in the Late Paleozoic–Early Mesozoic Era and the history evolution for the Xingmeng Orogenic Belt (XMOB) are sources of debate within the scientific community. This paper presents new geochronological, petrological, and geochemical data for Late Paleozoic–Early Mesozoic intrusions from the Siziwangqi region in the southeastern CAOB and discusses the tectonic setting for that area. Using zircon LA-MC-ICPMS U–Pb dating, intrusions can be broadly grouped as Late Carboniferous amphibolite with an age of 323.1 ± 3.4 Ma; Middle–Late Permian granitoids with ages of 271.3 ± 1.5 Ma, 261.3 ± 3.8 Ma, 260.6 ± 4.8 Ma, 259.9 ± 3.5 Ma, 253.3 ± 4.8 Ma, and 249.6 ± 4.8 Ma; Early Triassic K-feldspar granite with an age of 235.0 ± 1.8 Ma. These studies, by interaction of regional geology, provide new constraints on the tectonic evolution of the southeastern Central Asian Orogenic Belt during the Late Paleozoic–Early Mesozoic, and we predict five stages of tectonic evolution during the Late Paleozoic–Early Mesozoic: (1) the Early Carboniferous–Early Permian (>298 Ma), which is the active continental margin stage and the exit of the back-arc basin during the Late Carboniferous; (2) the Early Permian–Middle Permian (298–271 Ma), where there was continued subduction of Paleo-Asian oceanic lithosphere and the Solonker ophiolite emplacement at the end of Early Permian; (3) the Middle Permian (271–261 Ma), which had continent–continent collision between the Siberian Plate and the North China Craton; (4) the Middle Permian–Middle Triassic (261–235 Ma), which was the collisional orogeny stage with few intermountain basin deposition and the disappearance of marine strata; and (5) Late Triassic (