Late Palaeozoic tectonic evolution of the southern North China Craton: Constraints from detrital zircon dating and Hf–O isotopic compositions of the Benxi Formation, Sanmenxia area, North China Craton
2019; Wiley; Volume: 55; Issue: 2 Linguagem: Inglês
10.1002/gj.3481
ISSN1099-1034
AutoresAn‐Qi Wang, Debin Yang, Hao‐Tian Yang, Mao‐Song Mu, Yi‐Kang Quan, Le‐Ran Hao, Wen‐Liang Xu,
Tópico(s)High-pressure geophysics and materials
ResumoThis study presents new detrital zircon laser ablation inductively coupled plasma mass spectrometry (LA‐ICP‐MS) U–Pb ages and in situ Hf–O isotopic data in order to constrain the depositional age and provenance of the Benxi Formation in the Sanmenxia area of the southern North China Craton (NCC). Detrital zircons in quartz sandstone drillcore from the Benxi Formation are euhedral–subhedral, oscillatory zoned, and have high Th/U ratios (0.03–1.60, generally greater than 0.3) that are indicative of a magmatic origin. Detrital zircons from samples 13H16A and 13H16B yield seven (2544, 1788, 1123, 955, 737, 441, and 344 Ma) and six main age populations (2440, 1583, 951, 759, 434, and 348 Ma), respectively. The ε Hf (t) values of the Neoarchean–Paleoproterozoic zircons range from −11.3 to +13.9, and these zircons have δ 18 O values that range from 5.68‰ to 8.83‰. The Neoproterozoic zircons have variable ε Hf (t) (−9.2 to +12.5) and δ 18 O (5.58‰ to 9.85‰) values, whereas the Palaeozoic zircons have ε Hf (t) values between −19.9 and +13.4 and δ 18 O values of 5.23‰–9.43‰. The Benxi Formation was deposited during the late Carboniferous and contains sediments derived from igneous rocks of the North Qinling Orogen combined with a small amount of material derived from Precambrian basement of the NCC. The northward subduction of the South Qinling Orogen caused the uplift and erosion of the North Qinling Orogen during the late Carboniferous.
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