Petrogenesis of TTG gneisses from the Liaodong Bay Depression, Bohai Sea Basin: implications for the late Neoarchean tectonic evolution of the eastern North China Craton

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-06-06 DOI:10.1016/j.precamres.2025.107832

Kuizhou Li , Haifeng Yang , Chris Yakymchuk , Zilin Zhao , Qingbin Wang , Peng Xu , Fuhao Xiong , Min Deng , Mingcai Hou no

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Abstract

Late Neoarchean tonalitic–trondhjemitic–granodioritic (TTG) gneisses are extensively distributed across the North China Craton (NCC), providing crucial information in understanding the tectonic evolution of the region. However, the late Neoarchean to early Paleoproterozoic basement of the offshore Bohai Sea Basin (OBSB), a segment of the NCC, is extensively buried beneath Paleozoic to Cenozoic strata and submerged beneath marine waters, resulting in a poorly understood tectonic evolution history of this region. Here, we report new zircon U–Pb–Hf isotopic data, and whole-rock compositions for TTG gneisses from the Liaoxi Rise of Liaodong Bay Depression (LBD) of the OBSB in the northeastern NCC. The TTG gneisses are classified into two groups: the first group (ca. 2.57–2.52 Ga) is characterized by low MgO (0.2–1.05 wt%), and low REE (31.04–84.58 ppm), Cr (2.38–29.08 ppm), and Ni (7.52–16.07 ppm), and zircon ε_Hf(t) values are predominantly positive from +1.01 to +4.15, indicating that they originated from partial melting of mafic crust. In contrast, the second group (ca. 2.52–2.50 Ga) exhibits higher MgO (1.92–3.56 wt%), elevated REE (51.28–375.91 ppm), Cr (21.17–196.84 ppm), and Ni (31.23–70.16 ppm) concentrations, and also have positive zircon ε_Hf(t) values (+1.14 to +3.86), suggesting a petrogenetic origin involving the melting of oceanic crust with the incorporation of partial mantle material. Both groups of samples show characteristics consistent with a subduction-related tectonic setting. Integrated with ca. 2.50–2.46 Ga K-rich granitoid rocks and coeval mafic dykes, which formed in a subduction-related back-arc extensional setting within the study area, we propose that the Liaodong Bay Depression experienced subduction and followed by back-arc extension between ca. 2.57 Ga and ca. 2.46 Ga. This funding is consistent with the widespread late Neoarchean magmatic-metamorphic events documented across the NCC, which played a pivotal role in the stabilization and maturation of the continental crust.

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渤海盆地辽东湾坳陷TTG片麻岩成因及其对华北克拉通东部新太古代晚期构造演化的启示

晚新太古代华北克拉通（NCC）广泛分布于华北克拉通（NCC），为了解该地区的构造演化提供了重要信息。然而，渤海湾盆地新太古代晚期至早古元古代基底作为北陆构造中心的一部分，广泛埋藏于古生代至新生代地层之下，并淹没于海水之下，对该地区的构造演化史知之甚少。本文报道了北中东北地区辽东湾坳陷辽西隆起TTG片麻岩的新锆石U-Pb-Hf同位素数据和全岩组成。TTG片麻岩分为两组：第一组（约2.57 ~ 2.52 Ga）具有低MgO （0.2 ~ 1.05 wt%）、低REE （31.04 ~ 84.58 ppm）、低Cr （2.38 ~ 29.08 ppm）、低Ni （7.52 ~ 16.07 ppm）的特征，锆石εHf(t)值在+1.01 ~ +4.15范围内以正为主，表明其成因为基性地壳部分熔融；第二组（约2.52 ~ 2.50 Ga）的MgO （1.92 ~ 3.56 wt%）、REE （51.28 ~ 375.91 ppm）、Cr （21.17 ~ 196.84 ppm）、Ni （31.23 ~ 70.16 ppm）含量较高，锆石εHf(t)值为正（+1.14 ~ +3.86），表明其成因为洋壳熔融，部分地幔物质掺入。两组样品均显示出与俯冲相关的构造环境相一致的特征。结合研究区约2.50 ~ 2.46 Ga富钾花岗岩和同期基性岩脉形成于与俯冲有关的弧后伸展环境，认为辽东湾坳陷在约2.57 Ga ~约2.46 Ga之间经历了俯冲和弧后伸展。这一发现与记录在案的广泛的新太古代晚期岩浆变质事件相一致，这些事件在大陆地壳的稳定和成熟中发挥了关键作用。

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来源期刊

Precambrian Research 地学-地球科学综合

CiteScore

7.20

自引率

28.90%

发文量

325

审稿时长

12 months

期刊介绍： Precambrian Research publishes studies on all aspects of the early stages of the composition, structure and evolution of the Earth and its planetary neighbours. With a focus on process-oriented and comparative studies, it covers, but is not restricted to, subjects such as: (1) Chemical, biological, biochemical and cosmochemical evolution; the origin of life; the evolution of the oceans and atmosphere; the early fossil record; palaeobiology; (2) Geochronology and isotope and elemental geochemistry; (3) Precambrian mineral deposits; (4) Geophysical aspects of the early Earth and Precambrian terrains; (5) Nature, formation and evolution of the Precambrian lithosphere and mantle including magmatic, depositional, metamorphic and tectonic processes. In addition, the editors particularly welcome integrated process-oriented studies that involve a combination of the above fields and comparative studies that demonstrate the effect of Precambrian evolution on Phanerozoic earth system processes. Regional and localised studies of Precambrian phenomena are considered appropriate only when the detail and quality allow illustration of a wider process, or when significant gaps in basic knowledge of a particular area can be filled.