冀北兰峡沟钼矿花岗岩成因及其成矿意义-岩石矿物学杂志-CSCIED科技核心评价数据库-手机版

冀北兰峡沟钼矿花岗岩成因及其成矿意义

The petrogenesis of granite and its significance on mineralization in Lanxiagou Mo deposit of northern Hebei

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DOI	10.20086/j.cnki.yskw.2025.4150
刊名	岩石矿物学杂志 Acta Petrologica et Mineralogica
年，卷(期)	2025, 44(3)
作者	任颖伟，王红，郑岩，孟柯柯，李红宾，张璨，梁景利，董国臣*,
作者单位	1. 中国地质大学(北京) 地球科学与资源学院, 北京 100083; 2. 河北省地矿局第九地质大队, 河北邢台 054000; 3. 河北省自然资源档案馆, 河北石家庄 050051; 4. 华北地质勘查局五一四地质大队, 河北承德 067000
摘要	冀北兰峡沟钼矿床位于燕辽成矿带西部,辉钼矿多赋存在花岗质片麻岩中,花岗岩体中仅有零星矿化,岩浆活动对钼矿化的影响一直是其密切关注的问题之一。年代学研究表明,花岗岩的锆石U-Pb年龄为134.9±0.94 Ma,形成于早白垩世,与区域大规模岩浆活动时期一致。地球化学数据表明,兰峡沟花岗岩具有高硅(SiO₂为75.41%~76.21%)、富碱(Na₂O+K₂O为8.04%~8.73%)、富铝(Al₂O₃为12.19%~12.64%),贫钙(CaO为0.44%~0.85%)的特征,属高钾钙碱性系列、弱过铝质花岗岩。岩体富集大离子亲石元素(Rb、Th、U)和轻稀土元素,亏损重稀土元素和高场强元素(Nb、P、Ti),表现出中等Eu负异常(δEu=0.31~0.40)。电子探针结果显示,岩体中的黑云母为壳源铁质黑云母,表现出高Mg、Fe、K,低Ca、Na的特征; 斜长石为钠长石,具有高Al、Na,低K、Ca的特征。矿物学和地球化学特征表明岩体为分异I型花岗岩,在岩浆演化过程中经历了黑云母、斜长石、磷灰石等矿物的结晶分异作用。锆石Hf同位素显示,花岗岩的εHf(t)值介于-18.16~-14.76之间,二阶段模式年龄t_DM2(Hf)为2 570~2 117 Ma,表明岩体来源于古元古代下地壳物质的部分熔融。岩体中黑云母氧逸度相对较高,均落在NNO缓冲线以上。结晶温度为599~776℃,固结压力为164~260 MPa,侵位深度6.23~9.90 km,表明岩体形成于有利于钼矿成矿的温度和氧逸度环境,具有较好的找矿潜力。
Abstract	The Lanxiagou molybdenum deposit, situated in northern Hebei Province within the western Yan-Liao Metallogenic Belt, primarily hosts molybdenite within granitic gneisses, with only sporadic mineralization in granitic intrusions. The influence of magmatic activity on molybdenum mineralization remains a key research focus. Zircon U-Pb dating reveals the granitic intrusion formed at 134.9±0.94 Ma (Early Cretaceous), coeval with regional magmatic events. Geochemically, the Lanxiagou granite exhibits high SiO₂ (75.41%~76.21%), alkalis (Na₂O+K₂O=8.04%~8.73%), and Al₂O₃ (12.19%~12.64%) with low CaO (0.44%~0.85%), classifying as high-K calc-alkaline, weakly peraluminous granite. It displays enrichment in LILEs (Rb, Th, U) and LREEs, depletion in HREEs and HFSEs (Nb, P, Ti), and moderate Eu anomalies (δEu=0.31~0.40). EPMA analyses indicate crust-derived ferromagnesian biotite (high Mg, Fe, K; low Ca, Na) and albite (high Al, Na; low K, Ca). Mineralogical and geochemical signatures suggest a differentiated I-type granite with crystallization differentiation of biotite, plagioclase, and apatite. Zircon εHf(t) values (-18.16 to -14.76) and t_DM2(Hf) ages (2 570~2 117 Ma) indicate derivation from Paleoproterozoic lower crustal melting. The biotite in the intrusion exhibits relatively high oxygen fugacity (above the NNO buffer), with crystallization temperatures of 599~776℃, consolidation pressures of 164~260 MPa, and emplacement depths of 6.23~9.90 km, indicating formation under temperature and oxygen fugacity conditions favorable for molybdenum mineralization and significant exploration potential.
关键词	冀北地区；锆石U-Pb年龄；全岩地球化学；矿物成分特征；兰峡沟钼矿床
KeyWord	northern Hebei; zircon U-Pb dating; whole-rock geochemistry; mineral composition characteristics; Lanxiagou molybdenum deposit
基金项目
页码	556-572

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任颖伟，王红，郑岩，孟柯柯，李红宾，张璨，梁景利，董国臣*. 冀北兰峡沟钼矿花岗岩成因及其成矿意义 [J]. 岩石矿物学杂志. 2025; 44; (3). 556 - 572.

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