Canadian Journal of Earth Sciences Geochronology, geochemistry, and Hf isotopic compositions of Early Permian syenogranite and diabase from the northern Great Xing’an Range, NE China: petrogenesis and tectonic implications Journal: Canadian Journal of Earth Sciences Manuscript ID cjes-2019-0200.R1 Manuscript Type: Article Date Submitted by the 06-Apr-2020 Author: Complete List of Authors: Sun, Yonggang; Jilin University Li, Bile; Jilin University Feng-Yue, DraftSun; College of Earth Sciences, Jilin University Ding, Qing-feng; Jilin University, College of Earth Sciences Qian, Ye; Jilin University Li, Liang; Yunnan University Xu, Qinglin; Shandong University of Science and Technology Li, Yujin; Jilin University Early Permian, syenogranite, diabase, post-collisional extensional Keyword: setting, Xiaokele, northern Great Xing’an Range Is the invited manuscript for consideration in a Special Not applicable (regular submission) Issue? : https://mc06.manuscriptcentral.com/cjes-pubs Page 1 of 55 Canadian Journal of Earth Sciences 1 Geochronology, geochemistry, and Hf isotopic compositions of Early Permian 2 syenogranite and diabase from the northern Great Xing’an Range, NE China: 3 petrogenesis and tectonic implications 4 5 Yong-gang Suna, b, Bi-le Lia, *, Feng-yue Suna, Qing-feng Dinga, Ye Qiana, c, Liang 6 Lid, Qing-lin Xue, Yu-jin Lia, c 7 8 a. College of Earth Sciences, Jilin University, Changchun 130061, China 9 b. Geological Survey Institute of Jilin Province, Changchun 130102, China 10 c. Key Laboratory of Mineral ResourcesDraft Evaluation in Northeast Asia, Ministry of Land and 11 Resources, Changchun 130061, China 12 d. School of Resource Environment and Earth Science, Yunnan University, Kunming 650500, 13 China 14 e. College of Earth Science and Engineering, Shandong University of Science and 15 Technology, Qingdao 266590, China 16 17 *Corresponding author: Tel: 86-13353277179 18 E-mail: [email protected] 19 20 E-mail addresses: [email protected] (Y.-G. Sun) 21 [email protected] (B.-L. Li) 22 [email protected] (F.-Y. Sun) https://mc06.manuscriptcentral.com/cjes-pubs Canadian Journal of Earth Sciences Page 2 of 55 23 [email protected] (Q.-F. Ding) 24 [email protected] (Y. Qian) 25 [email protected] (L. Li) 26 [email protected] (Q.-L. Xu) 27 [email protected] (Y.-J. Li) 28 29 Postal address: 2199 Jianshe Street, College of Earth Sciences, Jilin University, 30 Changchun 130061, China 31 32 Abstract Draft 33 Geodynamic evolution in the Late Paleozoic is significant for understanding the final 34 amalgamation of the Central Asian Orogenic Belt (CAOB). No consensus has yet 35 been reached regarding the late Paleozoic geodynamic evolution of the northern Great 36 Xing’an Range (GXR) in Northeast China, the eastern CAOB. Furthermore, late 37 Palaeozoic syenogranite–diabase dyke association is present in the Xiaokele area in 38 northern GXR. It provides an important opportunity to understand the nature of 39 magmatism and the geodynamic evolution during this period. This paper presents new 40 zircon U–Pb ages, zircon Hf isotopic compositions, and geochemical data of 41 whole-rocks for Xiaokele syenogranite and diabase. Zircon U–Pb dating suggests that 42 the Xiaokele syenogranite (292.5 ± 0.9 Ma) and diabase (298.3 ± 1.5 Ma) were 43 emplaced during the Early Permian. The Xiaokele syenogranites have high SiO2 44 contents, low MgO contents, and enriched zircon εHf(t) values, suggesting that their https://mc06.manuscriptcentral.com/cjes-pubs Page 3 of 55 Canadian Journal of Earth Sciences 45 primary magma was generated by the partial melting of the juvenile crustal material. 46 The Xiaokele diabases have low SiO2 contents, high MgO contents, are enriched in 47 large-ion lithophile elements (LILEs), depleted in high-field-strength elements 48 (HFSEs), and exhibit enriched zircon εHf(t) values. They derived from a lithospheric 49 mantle source that had previously been metasomatized by slab-derived fluids. 50 Combined with previous research results, we believe that the continent–continent 51 collision between the Xing’an and Songliao blocks occurred during the late Early 52 Carboniferous–early Late Carboniferous (330–310 Ma), and the two blocks were 53 transformed into a post-collisional extensional setting during the latest Carboniferous– 54 Early Permian. Draft 55 56 Keywords: Early Permian, syenogranite, diabase, post-collisional extensional setting, 57 Xiaokele, northern Great Xing’an Range. 58 https://mc06.manuscriptcentral.com/cjes-pubs Canadian Journal of Earth Sciences Page 4 of 55 59 1. Introduction 60 The tectonic evolution of orogenic belts is characterized by changes in the 61 associated magmatic composition (Harris et al., 1986). Post-collisional magmatism, as 62 one of the common characteristics of many orogenic belts in the world, may indicate 63 that the orogenic belt is in an extensional environment (Dewey, 1988) and thus, we 64 can constrain the cessation of collision by studying the petrogenesis of post-collision 65 magmatism (Bonin, 2004; Yang et al., 2007; Hu et al., 2017). As the largest 66 accretionary orogenic belt in the world, the Central Asian Orogenic Belt (CAOB) lies 67 between the Siberian Craton in the north and the Tarim–North China Craton in the 68 south (Fig. 1a; Jahn et al., 2004; DraftLiu et al., 2017). Northeast (NE) China lies in the 69 east of the CAOB, being segmented into the Jiamusi, Songliao, Xing’an, and Erguna 70 Blocks from east to west, and divided by the Mudanjiang–Yilan, Hegenshan–Heihe, 71 and Xinlin–Xiguitu sutures (Fig. 1b; Liu et al., 2017). The Great Xing’an Range 72 (GXR) lies in the west of NE China (Fig. 1a, b) and is an important geological unit for 73 research on the geodynamic evolution of the CAOB (Liu et al., 2017). To date, no 74 consensus has been reached about the late Paleozoic geodynamic evolution of the 75 northern GXR. Some scholars have asserted that the northern GXR was in a 76 subduction setting during the Early Carboniferous–Early Permian (Dong et al., 2016; 77 Yang et al., 2019). Other researches have suggested that the tectonic setting of the 78 northern GXR had transformed into a post-collisional extensional setting by the late 79 Carboniferous (Liu et al., 2017; Zhang et al., 2018; Ma et al., 2019; Ji et al., 2018; 80 Qian et al., 2018a; Shi et al., 2019). These different opinions are attributed to the https://mc06.manuscriptcentral.com/cjes-pubs Page 5 of 55 Canadian Journal of Earth Sciences 81 absence of a comprehensive understanding of post-collisional magmatism. 82 Granitoid–mafic dyke associations are common in extensional tectonic regimes 83 linked to post-collisional events (Eby, 1992; Yang et al., 2007; Tang et al., 2014). The 84 Xiaokele area lies in the northern GXR (Fig. 1c), and late Palaeozoic granitoid–mafic 85 dyke associations are well exposed in this region, but few have been investigated in 86 detail. It provides a rare opportunity for understanding the nature of magmatism and 87 the geodynamic evolution during this period. 88 This paper presents new zircon U–Pb dating, zircon Hf isotopic, and 89 petrogeochemistry data of the Xiaokele diabase dyke and syenogranite to reveal their 90 source and petrogenesis. CombinedDraft with previous research results, we attempt to 91 constrain the controversial late Paleozoic geodynamic evolution of the northern GXR. 92 93 2. Geological background and sample descriptions 94 The GXR consists of the Erguna, Xing’an, and Songliao Blocks (Fig. 1b; Feng et 95 al., 2015). During the Paleozoic, the GXR was controlled by the evolution of the 96 Paleo-Asian Ocean. Several micro-continental blocks collided and collaged 97 successively with the continuous subduction of the Paleo-Asian Ocean (Şengör et al., 98 1993; Wu et al., 2011). After the Paleo-Asian Ocean closed, the GXR was 99 superimposed and modified by the Mongol-Okhotsk and Paleo-Pacific tectonic 100 regions during the Mesozoic (Xu et al., 2013; Tang et al., 2016, Sun et al., 2020). https://mc06.manuscriptcentral.com/cjes-pubs Canadian Journal of Earth Sciences Page 6 of 55 101 The Erguna Block is clamped between the Mongol–Okhotsk Suture and the 102 Xinlin–Xiguitu Suture (Fig. 1c). The basement of the Erguna Block is composed of 103 Proterozoic (1800–700 Ma) granitoids (Gou et al. 2013; Tang et al. 2013; Ge et al. 104 2015), Neoproterozoic metamorphic supracrustal rocks and granitoids (i.e., the 105 Xinghuadukou, Ergunahe, and Jiageda Groups; IMBGMR, 1991; Sun et al. 2013; Ge 106 et al. 2015). The Erguna Block is mainly composed of Paleozoic and Mesozoic 107 granitic intrusions, Mesozoic volcanic, and clastic rocks (IMBGMR, 1991; Wu et al., 108 2011; Ge et al., 2015; Tang et al., 2016). In addition, studies on the early Paleozoic 109 post-orogenic granites in the Tahe–Mohe area and blueschist facies metamorphic 110 rocks in Toudaoqiao show that theDraft amalgamation of the Erguna and Xing’an blocks 111 occurred at approximately 500 Ma along the Xinlin–Xiguitu suture zone (Fig. 1c; Ge 112 et al., 2005; Ge et al., 2007; Wu et al., 2011; Zhou et al., 2015). 113 The Xing’an Block is located adjacent to the southeast of the Erguna Block and 114 to the northwest of the Songliao Block (Fig. 1c). The Hegenshan–Heihe suture zone 115 records the closure of the Palaeo-Asian Ocean between the Xing’an and Songliao 116 Blocks (Wu et al., 2011; Liu et al. 2017, Yang et al. 2018). The Xing’an Block is 117 characterized by Paleozoic granitoids and sediments, and voluminous Mesozoic 118 granitoids and related volcanic and sedimentary strata (IMBGMR, 1991; Miao et al., 119 2004;