| 贾润幸,尹艳广,方维萱,李述国,张凯,李蒲刚.内蒙古额济纳旗格日勒图地区双峰式火山岩地球化学特征及其意义[J].矿产勘查,2025,16(8):1870-1880 |
| 内蒙古额济纳旗格日勒图地区双峰式火山岩地球化学特征及其意义 |
| Geochemical characteristics and significance of bimodal volcanic rocks in Geziletu, Ejina Banner, Inner Mongolia |
| 投稿时间：2025-07-27 |
| DOI：10.20008/j.kckc.202508004 |
| 中文关键词: 双峰式火山岩 地球化学 构造背景 额济纳旗 内蒙古中图分类号:P588.14文献标志码:A文章编号:1674-7801(2025)08-1870-11 |
| 英文关键词: Bimodal volcanic rocks geochemistry tectonic setting Ejina Banner Inner Mongolia |
| 基金项目:本文受阿拉善盟融拓铜业开发有限公司项目“内蒙古额济纳旗格日勒图铜多金属矿概略研究及外围前景分析”(250019)资助。 |
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| 中文摘要: |
| 内蒙古额济纳旗珠斯楞地区近些年新发现了多处铜、锑、金等矿床和矿点，为了研究本地区的构造背景，选取格日图勒铜多金属矿区上石炭统白山组上段(C2b2)火山岩进行重点研究并进行了主量元素、微量元素、稀土元素和电子探针分析测试。主量元素分析结果表明这套火山岩的 SiO2含量集中分布在 50.73%~ |
| 英文摘要: |
| In recent years, a number of copper, antimony and gold deposits and ore spots have been discoveredin Zhusileng area of Ejina Banner, Inner Mongolia. In order to study the tectonic background of this area, volcanicrocks of upper Member of Baishan Formation (C2b2) of Late Carboniferous in Geriletu copper polymetallic depositwere selected to focus on the study, and major elements, trace elements, rare earth elements and electron probeanalysis were carried out. The analysis results of major elements show that the SiO2 content of this volcanic rock is concentrated in 50.73%-56.41% and 69.53%-77.39%, which belong to the basic rocks and acid rocks respectively.The basic rocks include basalt and basalt andesite, etc. Acid rocks include rhyolite and dacite. The analysis resultsof trace elements and rare earth elements show that the (La/Sm)N values of acid rocks such as rhyolite and dacite ranged from 1.34 to 2.75, with an average value of 2.04. (Gd/Yb)N values ranged from 0.65 to 0.91, with an averagevalue of 078. Acidic rock samples such as rhyolite and dacite are enriched in Cs-Rb-Ba-Th-U-K-Pb and de-pleted in Nb-Ta-Sr-P-Ti elements, which is similar to granite. (La/Sm)N values in basaltic andesite and basaltic rock samples ranged from 0.76 to 1.72, with an average value of 1.10. (Gd/Yb)N values ranged from 0.61 to 1.58,with an average value of 1.00. Light rare earth and heavy rare earth fractionation is not obvious, Chondrite-normalized REE distribution curve is smooth on the whole, the primitive mantle-normalized curve is similar to dio-rite. The results of electron probe analysis of minerals show that the volcanic rocks in this area underwent obviousalteration due to tectonic-magmatic hydrothermal processes in the later period. The alteration types of acid volcanicrocks mainly include sericite and albionite. The alteration types of basic volcanic rocks are mainly chlorophyllitiza-tion, brown epidotization and epidotization. Based on geochemical characteristics, regional geological characteristicsand previous research data, it is concluded that the volcanic rocks of the upper member of the Baishan Formation(C2b2) of the Late Carboniferous in Ejina Banner, Inner Mongolia have the characteristics of bimodal volcanic rocks,forming a continental rift environment. |
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