| 卢仁,梁涛,刘小丽,张宇,袁稳.豫西熊耳山蒿坪沟花岗斑岩的地球化学特征及构造背景[J].矿产勘查,2025,16(8):1896-1907 |
| 豫西熊耳山蒿坪沟花岗斑岩的地球化学特征及构造背景 |
| Geochemical features of the Haopinggou granitic porphyry in the Xiong’er Mountains, western Henan Province, and their tectonic implications |
| 投稿时间:2024-11-28 |
| DOI:10.20008/j.kckc.202508006 |
| 中文关键词: 蒿坪沟 花岗斑岩 岩浆/流体混合 岩石圈拆沉 熊耳山 |
| 英文关键词: Haopinggou granitic porphyry magma/fluid mixing lithosphere delamination Xiong’er Mountains |
| 基金项目:本文受河南省自然资源科技攻关项目(2022-398-8)和河南省地质研究院地质科技攻关项目(2024-903-XM05-KT02、2024-903-XM06、2024-903-XM08)联合资助。 |
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| 中文摘要: |
| 蒿坪沟花岗斑岩是熊耳山沙沟—龙门店 Ag多金属矿集区内出露面积最大的早白垩世侵入岩,其岩石成因研究不仅有助于深入认识熊耳山地区岩石圈构造演化,而且能为矿集区成矿机制和找矿勘查提供新的认识。蒿坪沟花岗斑岩具有富硅、高碱和低镁、贫钙的特征,属于高钾钙碱性系列岩石。在微量元素蛛网图中,总体显示了 Rb、Th及 Zr、Hf的异常峰和 Nb、Ta、Sr、Ti的异常谷。稀土总量为 156×10-6~269×10-6,(La/Yb)N比值范围是 19.5~36.3,δEu值为 0.58~0.77,稀土配分模式具有右倾的轻稀土富集、重稀土亏损的特征,显示弱负 Eu异常。蒿坪沟花岗斑岩样品的 LaN-(La/Yb)N投点显示了正相关关系,表明其成分变异受控于部分熔融作用。蒿坪沟花岗斑岩的部分熔融源区残余相包括角闪石、斜长石和金红石,无石榴子石残余,形成于正常厚度地壳,部分熔融源区埋深 40~50 km。蒿坪沟花岗斑岩为早白垩世(约 130 Ma)岩石圈拆沉作用的产物,经历了岩浆/流体混合再活化作用,是成矿岩体,其深部具备成矿潜力。 |
| 英文摘要: |
| The Haopinggou granitic porphyry was the largest Early Cretaceous intrusive rocks in the Shagou-Longmendian Ag polymetallic ore concentration area in the Xiong’er Mountains, western Henan Province. Its petro-genetic model was not only significant to understand the deep tectonic evolution in the Xiong’er Mountains, but alsouseful to discuss the ore-forming genesis and exploration targets in the Shagou-Longmendian Ag polymetallic oreconcentration area. The samples of the Haopinggou granitic porphyry were characterized by higher SiO2 and alkali, and lower MgO and CaO, and compositional spots fell into high-K calc-alkaline series in the SiO2-K2O diagram.The positive anomalies of Rb, Th, Zr and Hf, and negative anomalies of Nb, Ta, Si and Ti were shown in spider dia-gram. Their total REEs were from 156×10-6 to 269×10-6 with (La/Yb)N ratios of 19.5~36.3. They had shown the char-acteristics of LREE-enrichment, and HREE depletion with Eu weakly negative anomalies (δEu values were 0.58 ~ 0.77). In the LaN-(La/Yb)N diagram, the sample points of the Haopinggou granitic porphyry had shown a positive cor-relation, indicating that the compositional variation was controlled by partial melting of source rock. The residualphases of its partial melting source included mainly hornblende, plagioclase and rutile, and no garnet. The Haoping-gou granitic porphyry was formed in the crust with normal thickness, and the depth of their melting source wasroughly 40~50 km. The Haopinggou granitic porphyry was one of the products of the lithosphere delamination in ~130 Ma, and experienced magma/fluid mixing and reactivation. The Haopinggou granitic porphyry was a mineral-ized intrusive, and its deep part processed the huge mineralization potential. |
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