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江头矿区位于青嶂山岩体北部，为粤北花岗岩型铀矿产地，但其研究程度相对较低，年代学、岩石成因及构造背景等方面仍存在广泛的争议。中基性岩脉年龄的精确厘定是研究其形成大地构造背景和地球深部动力学的重要前提。文章选取江头矿区的辉绿岩为研究对象，系统开展岩相学、岩石地化、锆石U-Pb年代学及锆石原位Hf同位素研究。结果表明：江头矿区辉绿岩富集Rb、U、Ta和Pb等元素，亏损Ba、Sr、Zr和Hf等元素，不具有明显的Nb、Ta、Ti负异常，且较低的Th/Ta、Zr/Hf和La/Sm值，表明辉绿岩几乎未遭受地壳混染作用；此外，相对低的Mg~#值以及Cr、Ni含量，指示辉绿岩在岩浆过程中发生了结晶分异作用。江头矿区辉绿岩锆石εHf(t)值介于-10.6～-7.3,tDM2为1 698～1 907 Ma，结合全岩地球化学特征，指示其母岩浆可能来源于富集地幔。江头矿区辉绿岩的锆石U-Pb年龄为(230.2±2.0) Ma，表明其形成于印支期(中三叠世)，与前人研究的青嶂山花岗岩年龄在误差范围内一致，应该为同一次岩浆事件的产物。综合前人及本次研究的地质、岩石地球化学和年代学数据，认为江头矿区在印支期(中三叠世)处于板内拉张环境。
Abstract：Jiangtou area is situated in the northern part of Qingzhangshan pluton and the source of granitic uranium deposits in northern Guangdong. However, insufficient research on this area left controversies persisting regarding to its chronology, petrogenesis, and tectonic setting. Accurate dating of intermediate-basic dykes is an important prerequisite for investigating their tectonic background of formation and deep-Earth dynamics, this study systematically conducts petrography, petrogeochemistry, zircon U-Pb chronology, and zircon Hf isotope studies with the diabase in Jiangtou area. The diabase in the Jiangtou area was found rich in elements such as Rb, U, Ta, and Pb, depleted in elements such as Ba, Sr, Zr, and Hf, no significant negative anomalies in Nb, Ta, and Ti, and its low Th/Ta, Zr/Hf, and La/Sm ratios, indicating that it has barely undergone crustal contamination. In addition, the diabase has relatively low Mg~#, Cr, and Ni values, indicating that fractional crystallization occurred during the magmatic process. The zircon εHf(t) values of the diabase in the Jiangtou area range from-10.6 to-7.3, with tDM2 of 1 698 to 1 907 Ma. Combined with the whole-rock geochemical characteristics, the diabase was considered to be originated from an enriched mantle. Zircon U-Pb age of the diabase in Jiangtou area is 230.2 Ma± 2.0 Ma, which fall to the Indosinian period(Middle Triassic) and is consistent with the age of Qingzhangshan granite reported by previous researchers, suggesting that they are the products of the same magmatic event. Combining with the result of the geological, petrochemical and chronological data from previous studies, we concluded that Jiangtou area was in an intraplate extensional environment during Indosinian period(Middle Triassic).
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基本信息:
中图分类号:P619.14;P597.3;P548
引用信息:
[1]杨戬.粤北青嶂山岩体江头矿区辉绿岩脉锆石U-Pb年代学、地球化学特征及其构造意义[J].铀矿地质,2025,41(06):1007-1022.
基金信息:
广东省铀资源勘查专项资金（编号：粤铀专[2024]-2）资助