| 孙平原,张文斌,何碧,苏雅拉吐,王宁祖,张志玺.甘肃省肃北县狼柴沟石榴子石矿地球化学特征及地质意义[J].甘肃地质,2026,35(3):27-35 |
| 甘肃省肃北县狼柴沟石榴子石矿地球化学特征及地质意义 |
| GEOCHEMICAL CHARACTERISTICS AND GEOLOGICAL SIGNIFICANCE OF LANGCHAIGOU GARNET DEPOSIT IN GANSU PROVINCE |
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| DOI： |
| 中文关键词: 石榴子石矿 地球化学 狼柴沟 甘肃省 |
| 英文关键词:garnet deposit geochemistry Langchaigou Gansu Province |
| 基金项目:敦煌地块北缘红柳河金矿床黄铁矿特征及成矿机制研究项目（24JRRA752）；老矿山深边部找矿预测项目（2024KS02）；甘肃省瓜州县黄龙岗—东涧泉地区 1 ∶ 5 万区域地质矿产调查（甘资勘发〔2020〕134 号；甘资勘函〔2021〕184 号）联合资助。 |
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| 中文摘要: |
| 为研究甘肃省肃北县狼柴沟石榴子石矿特征及其成因，对石榴子石样品进行了主量元素、稀土元素和微量元素测试分析。 结果表明： 石榴子石SiO2含量33. 99% ~ 35. 00%，Al2O3含量21. 19% ~ 22. 01%，Fe2O3T 含量33. 21% ~33. 68%，CaO含量2. 69% ~ 3. 42%，在（Al + ΣFe + Ti） - （Ca + Mg）图解中所有的样品均落入石榴石区；在A－C－FM图解中，全部样品均落入铝镁铁硅酸盐岩亚组区域；稀土元素总量（ΣREE）为102. 10 × 10-6 ～ 1 423. 62 × 10-6，平均为467. 44 × 10-6，ΣLREE ／ΣHREE变化范围为0. 24 ～ 10. 81，平均为3. 73；δEu值介于0. 84 ～ 2. 00之间，平均为1. 18；富集轻稀土元素和大离子亲石元素，亏损高场强元素P、Ti。 结合区域地质特征，研究认为甘肃省狼柴沟石榴子石矿经区域变质作用和接触变质作用（华力西期）形成，原岩为火成岩。 |
| 英文摘要: |
| To clarify the characteristics and genesis of the garnet deposit in Langchaigou of Gansu Province, the major element, rare earth element and trace element of garnet samples are analysed. The geochemical results show that the SiO2 content of garnet ranges from 33. 99% to 35. 00%, Al2O3 content from 21. 19% to 22. 01%, Fe2O3T content from 33. 21% to 33. 68%, and CaO content from 2. 69% to 3. 42%. All samples fall within the garnet field in the （Al + ΣFe + Ti） - （Ca + Mg） diagram. On the A-C-FM diagram, all samples are located in the area of the Aluminum-magnesia-ferric silicate subgroup. The total rare earth element （ΣREE） content ranges from 102. 10 × 10-6 to 1 423. 62 × 10-6, with an average of 467. 44 × 10-6. The ratio of ΣLREE ／ ΣHREE varies from 0. 24 to 10. 81, with an average of 3. 73. The δEu value ranges from 0.84 to 2. 00, with an average of 1. 18.The deposit is enriched in light rare earth elements and large ion lithophile elements, while depleted in high field strength elements , and shows obvious negative anomalies of P and Ti. Based on the regional geological features, it is suggested that the garnet deposit in Langchaigou, Gansu Province, was formed by regional metamorphism and contact metamorphism （Variscan）, with the protolith being igneous rock. |
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