Zircon U–Pb geochronology and petrogenesis of the Late Paleozoic–Early Mesozoic intrusive rocks in the eastern segment of the northern margin of the North China Block

Geochronology and geochemistry of middle Permian–Middle Triassic intrusive rocks from central–eastern Jilin Province, NE China: Constraints on the tectonic evolution of the eastern segment of the Paleo-Asian Ocean

“…9 a, b;Yang et al, 2006). The zircons from the middle Permian Fangniugou pluton located within the NCC have the lowest εHf(t) values (-17.1 to -14.1, Cao et al, 2013). Compared with the coeval granitoids from western Jilin Province (such as Jianpingzhen, Sanmenmojia, Fangshendingzi, Shuangfengshan, and Youyi plutons), the studied samples from central-eastern Jilin Province have relatively low εHf(t) values Fig.…”

Geochronology and geochemistry of early Paleozoic igneous rocks from the Zhangguangcai Range, northeastern China: Constraints on tectonic evolution of the eastern Central Asian Orogenic Belt

“…The absence of coeval mafic igneous rocks and the slightly positive Eu anomalies of these biotite monzogranites preclude their derivation by the fractional crystallization of basaltic magmas (Castillo et al, 1999). These monzogranites are also relatively K-rich, have low Mg# values, low concentrations of Cr, Co, and Ni, and contain magmatic zircon crystals with variable but low ε Hf (t) values (+3.78 to +5.44 and -0.82 to +1.48) and ancient T DM2 ages (1209-1103 Ma and 1490-1344 Ma), indicating that they were derived from magmas generated by the partial melting of thickened Mesoproterozoic lower continental crustal material under pressures and temperatures where garnet ± amphibole are stable (Petford and Atherton, 1996;Martin, 1999;Chung et al, 2003;Garrison and Davidson, 2003;Xiong et al, 2003;Cao et al, 2013;Li et al, 2015), rather than by the partial melting of subducted oceanic crust Defant et al, 1991) or delaminated thickened crustal material Xu et al, 2006;Gao et al, 2008). In contrast, the ca.…”

“…1A) and has a Paleozoic tectonic history that is dominated by the amalgamation of microcontinents, including the Erguna block, Xing'an block, Songnen-Zhangguangcai Range block (SZB), Jiamusi block (JB), and Khanka block (Fig. 1B;Li and Ouyang, 1998;Meng et al, 2010Meng et al, , 2011aWu et al, 2011;Wang et al, 2012a;Xu et al, 2009Xu et al, , 2012Xu et al, , 2013Cao et al, 2013;Li et al, 2014;Xu et al, 2014;Wang et al, 2015;Wilde, 2015;Liu et al, 2017). However, the early Paleozoic evolution of these blocks remains controversial, especially the history of the SZB and the JB.…”

Variable sediment flux in generation of Permian subduction-related mafic intrusions from the Yanbian region, NE China

“…(3) In the Yanbian area, the reported oldest granitoid was formed at 285 Ma (Zhang et al, 2004), which has similar Sr-Nd ( 87 Sr/ 86 Sr(i) = 0.706, ε Nd (t) = −13.6) isotopic compositions to the Mashan Group. (4) Cao et al (2013) reported that a middle Permian garnet-bearing monzogranite from central Jilin province (about 200 km northwest to the Yanbian area) had zircon ε Hf (t) values from −17.1 to −14.1, and with Hf single-stage model ages (T DM1 ) of 1.51-1.66 Ga. All these facts reflect the existence of recycled crustal rocks at lower-middle crustal levels in the Yanbian and adjacent areas. Once the mafic intrusions experienced crustal contamination or AFC processes by such recycled crustal rocks, the corresponding Sr-Nd-Hf isotopic variations among the samples can be observed.…”