| 安跃辉,梁婵,陈煜,康志娟,丁宁宁,李天琦,宋思佳,孙欣宇,马金虎.太行山早白垩世龙门斑岩钼矿床的岩浆成矿机制[J].矿产勘查,2026,17(6):1023-1035 |
| 太行山早白垩世龙门斑岩钼矿床的岩浆成矿机制 |
| Magmatic metallogenic mechanism of the Longmen porphyry molybdenum deposit in the Early Cretaceous Taihang Mountain |
| 投稿时间：2024-06-03 |
| DOI：10.20008/j.kckc.202606008 |
| 中文关键词: 斑岩钼矿床 Sr-Nd-Pb同位素 龙门 太行山 岩浆作用 |
| 英文关键词: porphyry molybdenum deposit Sr-Nd-Pb isotope Longmen Taihang Mountains magmatism |
| 基金项目:本文受河北省斑岩型矿床研究重点实验室专项资金项目(冀科平函[2023]38号)、河北省地质矿产勘查开发局项目(13000024P00329410271U、13000024P00F2D410535J)联合资助。 |
| 作者 | 单位 | | 安跃辉 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 梁婵 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 陈煜 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 康志娟 | 河北省地质实验测试中心,河北保定 071000 | | 丁宁宁 | 河北省地矿局第二地质大队,河北唐山 063000 | | 李天琦 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 宋思佳 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 孙欣宇 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 | | 马金虎 | 河北省地质工程勘查院,河北保定 071000
河北省斑岩型矿床研究重点实验室,河北保定 071000 |
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| 中文摘要: |
| 龙门钼矿床是太行山西缘典型斑岩矿床，钼矿赋存于龙门岩体的闪长岩、花岗斑岩、隐爆角砾岩中。本文对龙门岩体开展岩石学、地球化学及 Sr-Nd-Pb同位素特征研究，显示龙门钼矿床的含矿岩体属于高钾钙碱性系列，稀土元素地球化学特征表现为轻稀土相对富集，重稀土相对亏损，微量元素原始地幔蜘蛛网图显示龙门岩体的闪长岩、花岗斑岩具有不同的演化趋势，不相容元素均有不同程度的富集，龙门岩体 87Sr/86Sr平均值 0.7065，εNd(t)为-15.4~-14.9，铅同位素比值 206Pb/204Pb平均值为 16.7， 207Pb/204Pb平均值为 15.3， 208Pb/204Pb平均值为 36.8。表明岩浆为混入少量地幔物质的下地壳熔融体。结合区域地质背景、Sr-Nd-Pb同位素、地球化学特征，在中生代华北克拉通遭到破坏，经历构造体制转换及壳幔物质交换，使其古老下地壳部分发生熔融，沿太行山深断裂上侵，形成龙门斑岩体，所携带的有用组分在不同的条件下发生堆积，最终形成龙门钼矿床。龙门斑岩体及其外围是今后重点勘查区域。 |
| 英文摘要: |
| The Longmen molybdenum depositis a typical porphyry deposit on the western margin of the Tai-hang Mountains. Molybdenum orebodies are hosted in the diorite, granite porphyryand cryptoexplosive breccia ofthe Longmen pluton. Studies on petrology, geochemistry and Sr-Nd-Pb isotopic characteristics of the Longmen plu-ton reveal that the ore-bearing intrusions of the Longmen molybdenum deposit belongs to high-K calc-alkaline se-ries. Geochemical characteristics of rare earth elements (REE) indicate relative enrichment of light rare earth ele-ments (LREE) and deficiency of heavy rare earth elements (HREE). Primitive mantle-normalized trace element spi-der diagram shows distinct evolutionary trends in the diorite and granite porphyry of the Longmenpluton, with incom-patible elements showing varying degrees of enrichment. The Longmen pluton has an average 87Sr/86Sr ratio of 0.7065, εNd(t) values ranging from .15.4 to .14.9, and average lead isotope ratios of 16.7 for 206Pb/204Pb, 15.3 for 207Pb/204Pb, and 36.8 for 208 Pb/204Pb. These isotopic signatures imply that the magma was derived from partial meltingof the lower crust with minor mantle material contamination. Combined with regional geological setting and inte-grated geochemical and Sr-Nd-Pb isotopic data, the North China Craton underwent destruction during the Meso-zoic, accompanied by tectonic regime transformation and crust-mantle material interaction. Such processes trig-gered partial melting of ancient lower crustal rocks. The generated magmas ascended along the deep faults of theTaihang mountains to form the Longmen porphyrypluton. Useful mineral components accumulated under diverseconditions, ultimately resulting in the formation of the Longmen molybdenum deposit. The Longmen porphyry plu-ton and its peripheral areas represent priority targets for future mineral exploration. |
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