New discovery of 3.84−3.64 Ga diverse granitoids in eastern Hebei, North China Craton: Petrogenesis and significance

IF 3.9 1区 地球科学 Q1 GEOSCIENCES, MULTIDISCIPLINARY Geological Society of America Bulletin Pub Date : 2024-06-03 DOI:10.1130/b37553.1
C. Dong, Shoujie Liu, A. Nutman, Pengchuan Li, Hangqiang Xie, Yuan Li, Dunyi Liu, Yusheng Wan
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Abstract

Eoarchean rocks are scarce worldwide, limiting our understanding of Earth’s early history. This contribution presents the field geology, sensitive high-resolution ion microprobe (SHRIMP) U-Pb zircon dating, Nd-Hf-O isotopic analysis, and whole-rock geochemical study of Eoarchean granitoids newly discovered in the Labashan area, eastern Hebei, North China Craton. Eoarchean rocks, including 3838−3754 Ma trondhjemitic gneisses (4 samples), 3786−3773 Ma granodioritic gneisses (4 samples), 3775 Ma quartz monzonite gneiss (1 sample), and 3786−3640 Ma potassic granite gneisses (3 samples), are identified in a tract 1 km long. They are in tectonic contact with 3.4−3.1 Ga supracrustal rocks, with both occurring as enclaves in 2.5 Ga potassic granite. The trondhjemitic gneisses show low (La/Yb)N values (23.4−56.8) and insignificant Eu anomalies (Eu/Eu* = 0.86−1.24). Compared with the trondhjemitic gneisses, the granodioritic gneisses and quartz monzonite gneiss have lower (La/Yb)N ratios (9.2−11.3) and lower Eu/Eu* values (0.62−0.79). The potassic granites have (La/Yb)N ratios of 20.7−55.2 and Eu/Eu* values of 0.75−1.84. Zircon saturation temperatures of the granitoids range from 667 °C to 878 °C. They have whole-rock εNd(t) of −4.6 to 1.0 and tCHUR(Nd) of 4.3−3.6 Ga, and zircon εHf(t) values of −6.9 to 0.4 and tCHUR(Hf) ages of 4.1−3.5 Ga (mainly 4.1−3.8 Ga) and δ18O of 4.6‰−7.5‰ (CHUR—chondritic uniform reservoir). It is speculated that different amounts of low-K mafic rocks and tonalite-trondhjemite-granodiorite rocks with prior crustal residence times were the source of the spectrum of trondhjemitic to granitic compositions at Labashan. Two possible models, magma underplating and convergent plate boundary processes, are explored for the tectonic regime forming these Eoarchean granitoids.
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华北克拉通河北东部3.84-3.64 Ga多样性花岗岩的新发现:岩石成因及其意义
全世界的新元古代岩石非常稀少,限制了我们对地球早期历史的了解。本文介绍了在华北克拉通河北东部拉巴山地区新发现的始新统花岗岩的野外地质、灵敏高分辨离子微探针(SHRIMP)U-Pb锆石定年、Nd-Hf-O同位素分析和全岩地球化学研究。在1公里长的区域内发现了新元古代岩石,包括3838-3754Ma三迭纪片麻岩(4个样品)、3786-3773Ma花岗闪长岩(4个样品)、3775Ma石英单斜片麻岩(1个样品)和3786-3640Ma钾长花岗片麻岩(3个样品)。它们在构造上与 3.4-3.1 Ga 的超基性岩接触,都是 2.5 Ga 钾质花岗岩的飞地。三迭系片麻岩显示出较低的(La/Yb)N 值(23.4-56.8)和微不足道的 Eu 异常(Eu/Eu* = 0.86-1.24)。与闪长岩片麻岩相比,花岗闪长岩片麻岩和石英单斜片麻岩具有较低的(La/Yb)N 值(9.2-11.3)和较低的 Eu/Eu* 值(0.62-0.79)。钾质花岗岩的(La/Yb)N比率为20.7-55.2,Eu/Eu*值为0.75-1.84。花岗岩的锆石饱和温度在 667 ℃ 至 878 ℃ 之间。它们的全岩εNd(t)值为-4.6-1.0,tCHUR(Nd)值为4.3-3.6 Ga;锆石εHf(t)值为-6.9-0.4,tCHUR(Hf)年龄为4.1-3.5 Ga(主要为4.1-3.8 Ga),δ18O值为4.6‰-7.5‰(CHUR-软玉均匀储层)。据推测,不同数量的低K黑云母岩和具有前地壳停留时间的黑云母-闪长岩-花岗闪长岩是拉巴山三闪长岩-花岗岩成分谱的来源。本文探讨了形成这些始新世花岗岩的构造机制的两种可能模式,即岩浆下沉和板块边界汇聚过程。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Geological Society of America Bulletin
Geological Society of America Bulletin 地学-地球科学综合
CiteScore
9.30
自引率
8.20%
发文量
159
审稿时长
4-8 weeks
期刊介绍: The GSA Bulletin is the Society''s premier scholarly journal, published continuously since 1890. Its first editor was William John (WJ) McGee, who was responsible for establishing much of its original style and format. Fully refereed, each bimonthly issue includes 16-20 papers focusing on the most definitive, timely, and classic-style research in all earth-science disciplines. The Bulletin welcomes most contributions that are data-rich, mature studies of broad interest (i.e., of interest to more than one sub-discipline of earth science) and of lasting, archival quality. These include (but are not limited to) studies related to tectonics, structural geology, geochemistry, geophysics, hydrogeology, marine geology, paleoclimatology, planetary geology, quaternary geology/geomorphology, sedimentary geology, stratigraphy, and volcanology. The journal is committed to further developing both the scope of its content and its international profile so that it publishes the most current earth science research that will be of wide interest to geoscientists.
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