扬子地块北部古元古代造山作用：来自后河杂岩中酸性侵入岩的证据

IF 3.2 2区地球科学 Q2 GEOSCIENCES, MULTIDISCIPLINARY

Precambrian Research Pub Date : 2025-06-07 DOI:10.1016/j.precamres.2025.107827

Xiaoqi Li , Yan Zhao , Wenhao Ao , Meiqian Xu , Juan Zhang

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引用次数: 0

摘要

研究后河杂岩中酸性侵入岩的成因及其地质意义，对认识扬子地块北部古元古代构造演化具有重要意义。中间岩石（石英二长岩、闪长岩和石英闪长岩）在~ 2.08 Ga结晶，表现出高Na2O + K2O （5.94 ~ 9.47 wt%）、高Mg#（46.1 ~ 49.7）、高Cr （17.4 ~ 82.6 ppm）和高Ni （11.4 ~ 29.0 ppm）浓度，全岩ε Nd(t)和锆石εHf(t)值分别为-1.2 ~ + 1.1和-0.5 ~ + 2.8，对应于2.8 ~ 2.5 Ga的两阶段Nd- hf模式年龄。表明它们起源于古代基性下地壳的部分熔融，岩石圈地幔和俯冲板块物质的贡献。酸性岩石，包括~ 2.07 Ga二长花岗岩(Mg# = 33.9-39.2；Cr = 9.54-18.1 ppm；倪= 5.99 - -8.06 ppm)和2.03∼Ga Na-rich花岗岩(Na2O / K2O = 7.28 - -15.0;Mg# = 37.6-48.2；Cr = 0.96-2.32 ppm；Ni = 4.31 ~ 5.46 ppm)，全岩ε Nd(t)和锆石εHf(t)值分别为- 2.1 ~ + 0.9和- 0.6 ~ + 3.0，两阶段Nd- hf模式年龄为2.8 ~ 2.5 Ga，表明它们起源于新太古代基性-长英质地壳物质的部分熔融，地幔和俯冲板块的贡献可以忽略不计。中酸性岩石Rb、Ta、Nb、Y浓度低，Nb/Zr值低。此外，基于全岩（La/Yb）N值计算的地壳厚度在~ 2.0 Ga超过60 Km。综上所述，后河杂岩的古元古代（2.1 ~ 2.0 Ga）中酸性侵入岩形成于活跃的大陆边缘构造环境。综合古元古代岩石单元的时空分布，特别是北扬子地块的蛇绿质岩石单元，认为北扬子地块东西部可能在~ 2.0 ~ 1.9 Ga沿黄陵—钟乡俯冲碰撞带聚集，对应于~ 2.1 ~ 1.9 Ga全球与哥伦比亚超大陆相关的造山事件。

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Paleoproterozoic orogeny in northern part of the Yangtze Block: Evidence from intermediate-acidic intrusive rocks of the Houhe Complex

Investigations on the petrogenesis and geological significances of intermediate-acidic intrusions from the Houhe Complex provide crucial insights for understanding Paleoproterozoic tectonic evolution of the northern Yangtze Block. The intermediate rocks (quartz monzonite, diorite, and quartz diorite), crystallized at ∼ 2.08 Ga, exhibit high Na₂O + K₂O (5.94–9.47 wt%), Mg# (46.1–49.7), and elevated Cr (17.4–82.6 ppm) and Ni (11.4–29.0 ppm) concentrations, along with whole-rock ɛ_Nd(t) and zircon ε_Hf(t) values of –1.2 to + 1.1 and –0.5 to + 2.8, respectively, corresponding to two–stage Nd-Hf model ages of 2.8–2.5 Ga, suggesting their derivation from partial melting of ancient mafic lower crust with contributions of lithospheric mantle- and subducted slab-derived materials. The acidic rocks, comprising ∼ 2.07 Ga monzogranite (Mg# = 33.9–39.2; Cr = 9.54–18.1 ppm; Ni = 5.99–8.06 ppm) and ∼ 2.03 Ga Na-rich granite (Na₂O/K₂O = 7.28–15.0; Mg# = 37.6–48.2; Cr = 0.96–2.32 ppm; Ni = 4.31–5.46 ppm), exhibit whole–rock ɛ_Nd(t) and zircon ε_Hf(t) values of –2.1 to + 0.9 and –0.6 to + 3.0, respectively, with two-stage Nd-Hf model ages of 2.8–2.5 Ga, suggesting their origin from partial melting of Neoarchean mafic-felsic crustal materials with negligible mantle- and subducted slab contributions. Both intermediate and acidic rocks exhibit low Rb, Ta, Nb and Y concentrations, and low Nb/Zr values. Additionally, the crustal thickness calculated based on whole-rock (La/Yb)_N values exceeds 60 Km at ∼ 2.0 Ga. Collectively, these findings suggest that the Paleoproterozoic (2.1–2.0 Ga) intermediate-acidic intrusions from the Houhe Complex formed in an active continental margin tectonic setting. Furthermore, integrating the temporal-spatial distribution of Paleoproterozoic rock units, especially ophiolitic mélange in the northern Yangtze Block, it is proposed that the eastern and western parts of the northern Yangtze Block possibly assembled along the Huangling–Zhongxiang subduction-collision zone at ∼ 2.0–1.9 Ga, corresponding to the global Columbia supercontinent–related orogenic events during ∼ 2.1–1.9 Ga.

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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.