A Deep Mantle Source for the Late Neoarchean Metamorphosed Basalts in Eastern Hebei, North China Craton: Insights from Whole-Rock Geochemistry and Sm-Nd Isotopes, and Zircon U-Pb-Hf Isotopes

IF 4.1 2区地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Journal of Earth Science Pub Date : 2024-02-01 DOI:10.1007/s12583-023-1807-5

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Abstract

The basalts within the greenstone belt worldwide serve as an ideal target to decipher the nature of Archean mantle sources and further to extend the understanding of the early stages of Earth’s evolution. To provide important insights into the issues, we carried out a detailed investigation of whole-rock geochemistry and Sm-Nd isotopes, and zircon U-Pb-Hf isotopes for the Late Neoarchean metamorphosed basalts in eastern Hebei, North China Craton. U-Pb isotopic dating using the LA-ICP-MS on zircons reveals that the basalts in eastern Hebei erupted at ca. 2.48–2.51 Ga and subsequently experienced multiple regional metamorphic events at 2 477 and 1 798 Ma, respectively. The metamorphosed basalts are featured by low SiO₂, MgO, K₂O + Na₂O, and high FeO contents, endowed with the subalkaline and high-Fe tholeiitic affinities. The radiogenic initial Nd and Hf isotope values and correlations among V, Ni and Cr contents strongly imply that the basalts experienced significant clinopyroxene and olivine fractionation and minor crustal contamination during magma evolution. They are also characterized by the relatively low total REE contents and exhibit significant depletions to moderate enrichments in the LREE contents, indicating the derivation from a deep mantle source in an Archean proto-mantle plume setting.

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华北克拉通河北东部新元古代晚期变质玄武岩的深厚地幔源：全岩地球化学和 Sm-Nd 同位素以及锆石 U-Pb-Hf 同位素的启示

摘要全球绿岩带内的玄武岩是破译阿基坦地幔源性质的理想目标，也是进一步扩展对地球演化早期阶段认识的理想目标。为了对这些问题提供重要的见解，我们对华北克拉通河北东部新元古代晚期变质玄武岩进行了详细的全岩地球化学、Sm-Nd同位素和锆石U-Pb-Hf同位素研究。利用LA-ICP-MS对锆石进行U-Pb同位素定年发现，河北东部玄武岩爆发于约2.48-2.51 Ga，随后分别在2 477 Ma和1 798 Ma经历了多次区域变质事件。变质玄武岩的SiO2、MgO、K2O + Na2O含量较低，FeO含量较高，具有亚碱性和高铁质透辉岩的特征。放射性初始 Nd 和 Hf 同位素值以及 V、Ni 和 Cr 含量之间的相关性强烈暗示，玄武岩在岩浆演化过程中经历了显著的霞石和橄榄石分馏以及轻微的地壳污染。它们的另一个特点是 REE 总含量相对较低，而 LREE 含量则表现出显著的贫化到中等程度的富集，这表明它们是在 Archean 原地幔羽流环境中从深地幔源衍生而来的。

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来源期刊

Journal of Earth Science 地学-地球科学综合

CiteScore

5.50

自引率

12.10%

发文量

128

审稿时长

4.5 months

期刊介绍： Journal of Earth Science (previously known as Journal of China University of Geosciences), issued bimonthly through China University of Geosciences, covers all branches of geology and related technology in the exploration and utilization of earth resources. Founded in 1990 as the Journal of China University of Geosciences, this publication is expanding its breadth of coverage to an international scope. Coverage includes such topics as geology, petrology, mineralogy, ore deposit geology, tectonics, paleontology, stratigraphy, sedimentology, geochemistry, geophysics and environmental sciences. Articles published in recent issues include Tectonics in the Northwestern West Philippine Basin; Creep Damage Characteristics of Soft Rock under Disturbance Loads; Simplicial Indicator Kriging; Tephra Discovered in High Resolution Peat Sediment and Its Indication to Climatic Event. The journal offers discussion of new theories, methods and discoveries; reports on recent achievements in the geosciences; and timely reviews of selected subjects.