冀东唐山赵各庄本溪组含铝岩系地球化学特征及成矿物质来源

Geochemical Characteristics and Ore-Forming Material Sources of the Aluminum-Bearing Rock Series of Benxi Formation in Zhaogezhuang, Tangshan, Eastern Hebei

摘要: 随着全球资源竞争的加剧，矿产资源越发的重要。掌握各种矿产的资源状况有助于在国际资源博弈中占据有利地位，保障国家的资源安全。金属铝具有密度小、导电性好、抗腐蚀性强的特点，甚至可以广泛应用到航空航天领域。我国铝土矿主要集中于山西省与河南省地区，针对河北地区含铝岩系调查研究较为薄弱，即便发现了铝土资源也仅仅处于研究阶段，很大程度上限制了河北省整体铝土资源的找矿勘察与开发利用，本文针对这种情况对冀东唐山赵各庄地区本溪组含铝岩系展开研究。本论文主要通过X射线衍射实验(XRF)和电感耦合等离子体质谱分析技术(ICP-MS)对主微量元素进行测定得到了以下结论：(1) 通过X射线衍射实验(XRF)得知该地区含铝岩系主要的矿物组成为石英、高岭石、伊利石和钛矿物。(2) 通过主量元素Al₂O₃-SiO₂-Fe₂O₃三角图解可知冀东唐山赵各庄地区本溪组含铝岩系主要是以高岭土化作用的铝土质高岭石为主。(3) 根据样品可知冀东唐山赵各庄地区稀土总量变化大，轻稀土较重稀土富集，重稀土呈现部分亏损。较为轻微的δCe正异常，较为明显的δEu负异常。(4) 根据(La/Yb)_N-∑REE图解、Eu/Eu*-TiO₂/Al₂O₃图解、Th-Hf-Co图解和Zr-Cr-Ga图解综合分析显示赵各庄地区本溪组含铝岩系的成矿物质来源主要是中酸性花岗岩风化而成。(5) 通过Sr/Ba、Sr/Cu、U/Th、V/Cr和Ni/Co的比值可以得出赵各庄地区本溪组含铝岩系的成矿环境主要为湿润气候，来自富氧环境的陆相沉积，最终形成的冀东唐山赵各庄地区本溪组含铝岩系。

Abstract: With the intensification of global resource competition, mineral resources have become increasingly important. Mastering the resource status of various minerals helps to gain an advantageous position in the international resource game and ensure national resource security. Aluminum metal has the characteristics of low density, good electrical conductivity, and strong corrosion resistance, and can even be widely used in the aerospace field. In China, bauxite mines are mainly concentrated in Shanxi Province and Henan Province. The investigation and research on aluminum-bearing rock series in Hebei Province are relatively weak. Even if bauxite resources are discovered, they are only in the research stage, which greatly limits the prospecting, exploration, and development and utilization of bauxite resources in Hebei Province as a whole. In response to this situation, this paper conducts research on the aluminum-bearing rock series of the Benxi Formation in the Zhaogezhuang area of Tangshan, eastern Hebei. This thesis mainly measures the major and trace elements through X-ray diffraction experiment (XRF) and inductively coupled plasma mass spectrometry analysis technology (ICP-MS), and the following conclusions are obtained: (1) Through the X-ray diffraction experiment (XRF), it is known that the main mineral components of the aluminum-bearing rock series in this area are quartz, kaolinite, illite, and titanium minerals. (2) From the triangular diagram of major elements Al₂O₃-SiO₂-Fe₂O₃, it can be seen that the aluminum-bearing rock series of the Benxi Formation in the Zhaogezhuang area of Tangshan, eastern Hebei, is mainly composed of argillaceous kaolinite formed by kaolinization. (3) According to the samples, the total amount of rare earth elements in the Zhaogezhuang area of Tangshan, eastern Hebei, varies greatly. Light rare earth elements are more enriched than heavy rare earth elements, and heavy rare earth elements show partial depletion. There is a relatively slight positive δCe anomaly and a relatively obvious negative δEu anomaly. (4) Comprehensive analysis based on the (La/Yb)_N-∑REE diagram, Eu/Eu*-TiO₂/Al₂O₃ diagram, Th-Hf-Co diagram, and Zr-Cr-Ga diagram shows that the ore-forming materials of the aluminum-bearing rock series of the Benxi Formation in the Zhaogezhuang area are mainly derived from the weathering of intermediate - acid granite. (5) From the ratios of Sr/Ba, Sr/Cu, U/Th, V/Cr, and Ni/Co, it can be concluded that the ore-forming environment of the aluminum-bearing rock series of the Benxi Formation in the Zhaogezhuang area is mainly a humid climate, a continental deposit from an oxygen-rich environment, and finally the aluminum-bearing rock series of the Benxi Formation in the Zhaogezhuang area of Tangshan, eastern Hebei, was formed.