Late Neoarchean plate subduction in Western North China Craton: Evidence from ca. 2.51 Ga to 2.46 Ga basement rocks in Northern Ordos Basin

Tang, Gang; Yang, Mei; Song, Liang; Jia, Huichong; Liu, Huichuan; Zhang, Shaohua; Zhang, Wei; Zhang, Xing; Chen, Jie; Bai, Donglai; Li, Jingying

doi:10.1016/j.precamres.2023.106979

Cited by 3 publications

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“…The NCC is bounded by the Central Asian orogenic belt to the north, the Sulu orogenic belt to the east, and the Qinling-Dabie orogenic belt to the south. It is one of the oldest cratons in the world and preserves ancient crust relicts with an age of ∼3.8 Ga. , After the formation of a continental nucleus (>3.3 Ga) and the growth of a massive continental crust (2.9–2.5 Ga), the Western and Eastern Blocks of the NCC separately completed microblock assembly and cratonization at 1.95–1.85 Ga. − After 1.8 Ga, the NCC developed multiple rifts (Xiong’ er, Yanliao, Zha’ ertai-Bayan’ Obo, Jinshaan, Helan, etc. ), accepted Paleo-Mesoproterozoic strata, and was affected by multistage magmatic activities (Figure ).…”

Section: Regional Geology and Sample Descriptionsmentioning

confidence: 99%

Late Paleoproterozoic Breakup Event in the Southern Margin of the North China Craton: Evidence from A-Type Granites

Chen,

Yang,

Tian

et al. 2024

ACS Earth Space Chem.

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The late Proterozoic tectonic evolution of the North China Craton (NCC) has long been a matter of debate, and A-type granites in the region can provide valuable constraints for resolving this issue. In this paper, the Baojiashan and Longwangzhuang granites from the southern margin of the NCC were studied using a combination of LA-ICP-MS zircon U−Pb dating, Hf−Nd isotopic analyses, and whole-rock geochemical analyses to constrain their magmatic ages and sources. The Baojiashan and Longwangzhuang granites yield intrusion 207 Pb/ 206 Pb ages of 1803 ± 29 and 1607 ± 21 Ma, respectively. They show significant geochemical similarities to the A-type granites, with high SiO 2 and K 2 O content, high FeO T /(FeO T + MgO) and 10,000 Ga/Al ratios, strong Eu-negative anomaly, and high zircon saturation temperature (813−982 °C). Among them, the Baojiashan granites display a lower Nb/Ta ratio and a higher Y/Nb ratio, consistent with the characteristics of A 2 -type granites. Longwangzhuang granites exhibit opposite ratios of the above, following the characteristics of A 1 -type granites. The zircon ε Hf (t) values (−6.5 to −3.0) and ε Nd (t) values (−6.7 to −2.4) of both are similar, and the second-stage model ages (T DM2 ) are 2588−2730 and 2462−2953 Ma, indicating that they mainly originated from the partial melting of the Neoarchean crust. Combined with previous analytical results, the southern margin of the NCC experienced a process of postorogenic extension toward intracontinental rift at 1.8−1.6 Ga and represents a response to the breakup of the Columbia supercontinent.

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