Zircon U-Pb-Hf isotopic characteristics of leptite in the Fuping Group, Hebei Province, and its geological significance
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P588.3;P597

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    Abstract:

    The Fuping Group, which has undergone amphibolite to granulite facies metamorphism, is the most widely distributed Archean strata in Fuping area of the Central North China Craton. The age of the Group is vital for probing the evolutionary history of the Fuping Complex. In this paper, LA-MC-ICP-MS (laser ablation multi-collector inductively coupled plasma mass spectrometry) was used to analyze the zircon U-Pb-Hf isotope of leptite in the Yuanfang Formation of the Fuping Group. The authors obtained two metamorphic zircon ages of 2 531±15 Ma and 1 943±16 Ma, respectively. Based on the internal structure of zircons and U-Pb ages, the authors chose the 207Pb/206Pb age of 2 549±4 Ma from the 2 549 Ma to 2 500 Ma detrital zircon domains as the maximal depositional age and confirmed the Yuanfang Formation between 2 550 Ma and 2 530 Ma. The zircon Lu-Hf isotopic analyses demonstrate that 176Lu/177Hf and 176Hf/177Hf are 0.000 289~0.004 262 and 0.281 255~0.281 791, respectively with 176Hf/177Hfi and εHf(t) range being 0.281 230~0.281 623 and -5.86~13.62. The single-stage and two-stage model ages are in the range of 2 748~2 242 Ma and 2 810~2 272 Ma, respectively. On such a basis, the authors infer that the source of the Yuanfang Formation was mainly from Neoarchean TTG gneisses in the Fuping Compex, and the intensive crustal growth in the Complex was concentrated from 2.8 Ga to 2.6 Ga. In addition, the authors infer that metarmorphic ages of 2.5 Ga and 1.95 Ga may represent metamorphic events related to the initial and finial cratonization of the North China Craton.

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王建龙,宋会侠,段庆松,黄智强,程海峰,杨崇辉,耿元生,杜利林,2020,河北阜平杂岩中阜平岩群浅粒岩锆石U-Pb-Hf同位素特征及其地质意义[J].岩石矿物学杂志,39(3):267~282. WANG Jian-long, SONG Hui-xia, DUAN Qing-song, HUANG Zhi-qiang, CHENG Hai-feng, YANG Chong-hui, GENG Yuan-sheng, DU Li-lin,2020,Zircon U-Pb-Hf isotopic characteristics of leptite in the Fuping Group, Hebei Province, and its geological significance[J]. Acta Petrologica et Mineralogica,39(3):267~282.

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  • Received:October 22,2019
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  • Online: May 11,2020
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