Early Precambrian tectonothermal events of the North China Craton: Constraints from in situ detrital zircon U-Pb, Hf and O isotopic compositions in Tietonggou Formation

Abstract

Clastic sediments and sedimentary rocks are widely used for understanding the formation and evolution of the continental crust. The Tietonggou Formation outcrops in the Xiaoqinling region at the southern margin of the North China Craton (NCC) and has unconformable contacts with the underlying Taihua Complex and overlying Paleoproterozoic Xiong'er Group. It mainly consists of quartzite and its protoliths are mature terrigenous clastic rocks. On the basis of the ages of the youngest detrital zircons from the quartzites and the ages of the Xiong'er Group, the depositional ages of the protoliths of the Tietonggou Formation were well constrained to 1.91-1.80 Ga. The U-Pb isotopic data of detrital zircons from the Formation show a major age peak at ~2.1 Ga, which is consistent with 2.2-2.0 Ga magmatism in the Trans-North China Orogen of the NCC. Taking into account the texctural and compositional maturity of the Tietonggou Formation quartzite, the ~2.1 Ga lithologic units in the Trans-North China Orogen are interpreted as the major source of the Tietonggou Formation. The majority of these ~2.1 Ga detrital zircons mostly have high δ 18 O values (>6.5‰) and negative ε Hf (t) values (-7.8-0.0), with corresponding Hf model ages significantly older than their crystallization ages, indicating that these zircons formed from the partial melting of ancient continental crust. The majority of the 2.8-2.7 Ga and ~2.5 Ga detrital zircons from the Tietonggou Formation had positive ε Hf (t) values, and mantle-like δ 18 O values, suggesting that the NCC has experienced two stages of significant crustal growth in the Neoarchaean at 2.7 and 2.5 Ga, respectively. The Hf isotopic data of detrital zircons from Paleoproterozoic metasedimentary rocks in the Trans-North China Orogen varied mainly toward the reduction of the radiogenic Hf isotope and gradually show a similar trend of the isotope trajectories of crustal evolution. This reveals that the NCC probably has not developed a long-lived subduction to complete the final assembly of the NCC. Alternatively, these maybe imply that the tectonic setting of the NCC substantially changed at ~2.1 Ga, the reduction of the radiogenic Hf isotope could be attributed to the rollback of the subducting slab. North China Craton, Tietonggou Formation, detrital zircon, Hf isotope, O isotope Citation:Diwu C R, Sun Y, Gao J F, et al. Early Precambrian tectonothermal events of the North China Craton: Constraints from in situ detrital zircon

Archean-Paleoproterozoic crustal evolution of the Ordos Block in the North China Craton: Constraints from zircon U–Pb geochronology and Hf isotopes for gneissic granitoids of the basement

“…Data sources for the magmatic zircons: Chen et al (2006), Diwu et al (2007, 2010, 2011), Guo et al (2008), Liu et al (2009a,b, 2012d), Du et al (2010, 2013), Huang et al (2010, 2012), Jiang et al (2010), Wang et al (2010), Wang and Liu (2012), Zhou et al (2011, 2014), Zhang et al (2011, 2012b), Geng et al (2012), Li et al (2012a), Zhao et al (2011),Zhang et al (2013a,b,c) andMa et al (2013). Data sources of U-Pb and Hf model ages for detrital zircon are fromXia et al (2006c, 2009), Liu et al (2011a,b, 2012a,Geng et al (2012),Yin et al (2011),Dan et al (2012) andDiwu et al (2013b).…”

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

“…1b), and consists mainly of the Neoarchean to early Paleoproterozoic basement rocks and the overlying late Paleoproterozoic to Phanerozoic cover sequences (e.g., Sun et al, 1981;Zhang et al, 1985;Guan et al, 1988;Li et al, 1995;Wan et al, 2006a,b). The crystalline basement comprises the Neoarchean to early Paleoproterozoic TTG and Paleoproterozoic metamorphosed supracrustal rocks of the Taihua Group (e.g., Sun et al, 1981;Zhang et al, 1985;Guan et al, 1988;Wan et al, 2006a,b;Liu et al, 2009;Xu et al, 2009;Diwu et al, 2010Diwu et al, , 2013Diwu et al, , 2014Huang et al, 2010Huang et al, , 2012Huang et al, , 2013Shi et al, 2011), which is unconformably overlain by the Paleoproterozoic Tietonggou Formation. The Tietonggou Formation, limited with a thickness of 315-2850 m (e.g., Diwu et al, 2013), consists predominantly of quartzites whose protolith depositional ages were constrained at 1.91-1.80 Ga (e.g., Diwu et al, 2013Diwu et al, , 2014.…”

Secular Changes in Relationships Between Plate-Tectonic and Mantle-Plume Engendered Processes During Precambrian Time

“…During this period, a large amount of mantle materials was added to form the juvenile crust: tonalite-trondhjemite-granodiorite gneisses, potassic granite and sedimentary-volcanic rocks. The Neoar-chaean magmatism and contemporaneous metamorphism were interpreted as related to a mantle plume [Diwu et al, 2013].…”