Crustal growth at ∼2.5 Ga in the North China Craton: evidence from whole-rock Nd and zircon Hf isotopes in the Huai’an gneiss terrane

Origin and geological significance of the 1.81 Ga hyalophane-rich pegmatite veins from the high-pressure granulite terrain in the Central Zone of North China Craton

“…Huai'an gneiss terrane consists mainly of TTG gneisses (more than 80%) and dioritic gneisses. They both crystallized in late Archean, and underwent the 1.85 Ga granulite facies metamorphism [17].…”

LA-(MC)-ICPMS U-Pb zircon geochronology and Lu-Hf isotope compositions of the Taihua complex on the southern margin of the North China Craton

“…The abundant TTG gneiss, mantle-derived granites and minor supracrustal rocks were formed during this time. Therefore, 2.50 Ga is the most important time for the formation and cratonlization of the NCC [1][2][3][4][43][44][45]. However, the whole-rock Nd isotope depleted mantle model ages and Hf model ages of detrital zircons from modern rivers in the NCC obviously show that its the major crustal growth in the NCC occurred at 2.8-2.7 Ga.…”

“…However, the whole-rock Nd isotope depleted mantle model ages and Hf model ages of detrital zircons from modern rivers in the NCC obviously show that its the major crustal growth in the NCC occurred at 2.8-2.7 Ga. In the NCC, The 2.8-2.7 Ga tectonothermal event was well developed in Lushan area of Henan Province [7][8][9][10], west Shandong Province [11][12][13], the Jiaodong Peninsula [14], besides this, 2.8-2.7 Ga detrital zircons or xenocryst zircons were found in Huai'an [4], Fuping [46], Wutai [47] of NCC. Undoubtly, these age data strongly indicate that the 2.8-2.7Ga tectonothermal event might have been widely developed in the NCC, which presents a major period of continental crust formation.…”

“…Recently, with a great increase of geochronological data produced by SHRIMP and LA-ICPMS zircon dating, some researchers emphasized that the most important tectonothermal event could take place at 2.5 Ga in the North China Craton (NCC) and the age of 2.5 Ga represents a major period of continental crust growth in the NCC [1][2][3][4]. However, the whole-rock Sm-Nd isotopic data [5] and Hf isotopes of detrital zircons from modern rivers [6] indicate that the major crustal growth event in the NCC occur at 2.8-2.7Ga, as *Corresponding author (diwuchunrong@163.com) many other cratons in the world, whereas the 2.5 Ga crustal growth event may be relatively weaker.…”

Petrogenesis of the Archean tonalite–trondhjemite–granodiorite (TTG) and granites in the Lushan area, southern margin of the North China Craton: Implications for crustal accretion and transformation

“…High-Al TTG gneisses in the Huai'an (2544 ± 9 to 2464 ± 11 Ma; Liu et al, 2009bLiu et al, , 2012, Lüliang-Wutai (2509 ± 7 Ma; Chen et al, 2006) and Zhongtiaoshan areas (2536 ± 8 Ma; Guo et al, 2008), together with related amphibolites, are considered to have formed in an arc setting. The high-K magmatism such as Lujiagou Atype granite in the Lushan area (2424 ± 35 Ma, Zhou et al, 2011), Henglingguan granodiorite (2256 ± 35 Ma) and Yanzhuang moyite-monzogranite (2297 ± 21 Ma) in the Zhongtiaoshan area indicate a post-collisional setting .…”