SHRIMP and LA-ICP-MS zircon geochronology of the Xiong’er volcanic rocks: Implications for the Paleo-Mesoproterozoic evolution of the southern margin of the North China Craton

SHRIMP U-Pb zircon dating of the Ordos Basin basement and its tectonic significance

“…The high-grade metamorphic terrain and granitic greenstone at the eastern crustal basements of the North China Craton are mainly with late Archean age; the western TTG gneiss, supracrustal rocks and the Paleoproterozoic khondalite of North China Craton are formed at the late Archean; and the central orogen of North China Craton is composed of the late Archean to the Paleoproterozoic TTG gneiss, supracrustal rock, mafic dike swarm and syn-or post-tectonic granite. In the previous Archean metamorphic terrain, many blocks of Proterozoic granitic gneiss and supracrustal rocks have been discovered [14,[25][26][27][28][29][30][31][32][33][34][35]. The magmatic ages from this research are consistent with a) Errors are 1; Pb c and Pb* indicate the common and radiogenic portions, respectively.…”

Geochronology and geochemistry of the late Paleoproterozoic aluminous A-type granite in the Xiaoqinling area along the southern margin of the North China Craton: Petrogenesis and tectonic implications

“…In addition, compared with the voluminous Xiong'er group volcanism in the southern NCC (1.78-1.75 Ga, e.g., Hu and Lin, 1988;Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2009), the Guijiayu granitic magmatism was slightly earlier.…”

“…The Xiong'er Group is dominated by intermediate to acidic lavas and pyroclastic rocks with minor intercalated sedimentary rocks (<5%), whose emplacement ages at about 1.80-1.75 Ga (possibly extending to 1.45 Ga) (e.g., Sun et al, 1981;Hu and Lin, 1988;Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2008He et al, , 2009. In turn, the Xiong'er Group is overlain unconformably by the Meso-to Neoproterozoic terrigenous clastic rocks and carbonates (Fig.…”

“…That is, the timing of subduction and subsequent peak collision between continent and continent had finished at least before $1.80 Ga in the southern margin of the NCC. In this respect, invoking other tectonic settings, such as (1) intracontinental rift or mantle plume (e.g., Sun et al, 1981;Zhao et al, 2002b;Zhai and Liu, 2003;Peng et al, 2005Peng et al, , 2008Peng et al, , 2015aZhai et al, , 2014Zhai et al, , 2015Wang et al, 2015) or (2) continental margin arc (e.g., Hu and Lin, 1988;Chen et al, 1992;He et al, 2008He et al, , 2009He et al, , 2010, to account for the late Paleoproterozoic (1.80-1.60 Ga) magmatism, especially for the Xiong'er volcanic rocks (e.g., Ren et al, 2000;Zhao et al, 2002bZhao et al, , 2004Zhao et al, , 2015Peng et al, 2008;He et al, 2009) that are younger than $1.80 Ga event and did not show strong metamorphic and deformation signatures, seems to be incompatible with such metamorphic P-T paths in the southern margin of the NCC. Consequently, a post-collisional regime is the most viable mechanism to interpret the generation of the Guijiayu aluminous Atype granite.…”

“…Moreover, increasing number of data, especially for the 1.8-1.2 Ga magmatism and sedimentation, have demonstrated that the NCC was involved in the assembly, growth and breakup of the Columbia supercontinent (e.g., Zhao et al, 2002aZhao et al, ,b, 2003Zhao et al, , 2004Ernst et al, 2008). However, regarding the tectonic evolution in the southern margin of the NCC, it is still unknown whether the final collision in the southern NCC was finished at $1.80 Ga or it remained an arc environment at that time (Hu and Lin, 1988;Chen et al, 1992;He et al, 2008He et al, , 2009He et al, , 2010, though the unique development of the 1.8-1.75 Ga Xiong'er Group volcanosedimentary series in the southern margin which is the oldest sedimentary record in the NCC after its final assembly at $1.85 Ga (Zhao et al, 2001(Zhao et al, , 2003(Zhao et al, , 2005Wilde et al, 2002). The recognition of the alkaline rock and alkaline-rich granite belt with an emplacement ages from Proterozoic to Cretaceous (Hu and Lin, 1988;Lu, 1989) can provide important insight into the tectonic evolution in the southern margin of the NCC, particularly for the identification of some late Proterozoic A-type granites in the alkaline rock belt (Lu et al, 2003;Bao et al, 2009;Liu, 2011;Wang et al, 2013).…”