The growth, reworking and metamorphism of early Precambrian crust in the Jiaobei terrane, the North China Craton: Constraints from U–Th–Pb and Lu–Hf isotopic systematics, and REE concentrations of zircon from Archean granitoid gneisses

Anatomy of zircon growth in high pressure granulites: SIMS U–Pb geochronology and Lu–Hf isotopes from the Jiaobei Terrane, eastern North China Craton

“…These multiple origins and various apparent ages of the cores indicate that these are inherited grains likely captured from the country rocks during the emplacement of the mafic dykes (protolith of the granulites), because of their oscillatory zoning while magmatic zircons seldom crystallize in mafic dykes and the metamorphic zircons crystallized from the mafic dykes during metamorphism do not show such zoning patterns as magmatic zircons. This interpretation is consistent with previous studies which showed that the country rocks, like the TTG gneisses, recorded metamorphism of about 2.5 Ga (Liu et al, 2013b;Tang et al, 2007;Wang et al, 2014;Wu et al, 2014) which is similar to the apparent 207 Pb/ 206 Pb age of 2436 Ma in this study. All other analyzed spots have significantly low contents of Th and U and low Th/U ratios (b 0.1) and their apparent 207 Pb/ 206 Pb ages range from 1807 to 1921 Ma with two main age peaks, one at 1859 Ma and the other at 1921 Ma (Fig.…”

“…Most of the ε Hf (t) values of the newly grown metamorphic rocks from sample QX-57 scatter at around ε Hf (t) = −1.6 and the Hf crustal model ages (T DM C ) mainly range between 2.5 and 2.7 Ga, possibly representing the isotopic composition of this portion of the sediments that was metamorphosed to form the pelitic granulite. Our inferences are consistent with the published results from this area, and also compare with the results from Paleoproterozoic rocks in the Jiao-Liao-Ji belt (Jahn et al, 2008;Luo et al, 2008;Li et al, 2011;Liu et al, 2011bLiu et al, , 2013b …”

New geochemical and combined zircon U–Pb and Lu–Hf isotopic data of orthogneisses in the northern Altyn Tagh, northern margin of the Tibetan plateau: Implication for Archean evolution of the Dunhuang Block and crust formation in NW China

“…8 (data from Chen et al, 2006Chen et al, , 2013Diwu et al, 2007Diwu et al, , 2011Gao et al, 2011;Guo et al, 2008;Jiang et al, 2010;Jiao et al, 2009;Liu et al, 2008a;Liu et al, 2009Liu et al, , 2013Long et al, 2010Long et al, , 2011aWan et al, 2007;Wu et al, 2008;Yang et al, 2008;Zhang et al, 2006;Zong et al, 2013). This new data set indicates that the NCC experienced several periods of crustal growth in the Archean (Fig.…”

“…The earliest growth occurred in the Eoarchean with the oldest age peak at 3.95 Ga, followed by peaks at 3.76 and 3.49 Ga. The most Wan et al (2007), Diwu et al (2007, Guo et al (2008), Yang et al (2008), Liu et al (2008a);Liu et al (2009Liu et al ( , 2013, Jiang et al (2010), and Liu et al (2013) pronounced crustal growth appears to have occurred during the middle Mesoarchean to Neoarchean, culminating in a pronounced age peak at 2.84 Ga. This is also supported by recent reviews of detrital zircon ages from the NCC (Geng et al, 2012;, and references therein).…”

Middle–Late Mesozoic sedimentary provenances of the Luxi and Jiaolai areas: Implications for tectonic evolution of the North China Block

“…On the east side of the Tan-Lu fault, basement rocks of the Jiaobei terrane and the Jiaolai basin have an affinity to the NCB (Wu et al, 2004;Jahn et al, 2008;Liu et al, 2013), while that of the Sulu orogen belong to the Yangtze Block. The basement of the Yangtze Block is chronologically characterized by diagnostic mid-Neoproterozoic ages (ca.…”