| 耿健,王玉往,陈昱,王新雨.青海牛苦头矿区蚀变岩浆岩元素迁移特征[J].矿产勘查,2025,16(5):1065-1077 |
| 青海牛苦头矿区蚀变岩浆岩元素迁移特征 |
| Element migration characteristics of altered magmatic rocks in Niukutou deposit, Qinghai Province |
| 投稿时间：2025-03-27 |
| DOI：10.20008/j.kckc.202505011 |
| 中文关键词: 蚀变岩浆岩 主微量 标准化 Isocon分析法 元素迁移 牛苦头矿区 |
| 英文关键词: altered magmatic rock major and trace elements standardized isocon analysis method element |
| 基金项目:本文受中国铜业青海鸿鑫矿业有限公司找矿项目“青海省格尔木牛苦头及外围铅锌成矿规律研究与潜力评价”(QHHXKZZYB2020001)资助。 |
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| 中文摘要: |
| 青海牛苦头矿区位于东昆仑造山带祁漫塔格多金属成矿带东段，区内岩浆热液蚀变作用与矿床的形成密切相关。本文通过岩相学观察、主微量元素分析及标准化 Isocon质量平衡计算，系统研究了花岗闪长岩在热液蚀变过程中元素的迁移特征。结果表明，从新鲜花岗闪长岩→弱蚀变(矽卡岩化)花岗闪长岩→绢英岩化花岗闪长岩→次生石英岩的蚀变序列中，SiO2含量逐步升高(64.91%~92.01%)而 TiO2、Al2O3、TFe2O3、 CaO、Na2O等主量元素显著迁出，K2O呈现先增后减趋势。微量元素中，Cu、Pb、Zn等成，矿元素在蚀变过程中持续带出，而 Rb、Th、U等大离子亲石元素在绢英岩化阶段迁入。稀土元素总量(ΣREE)在弱蚀变阶段迁出(平均 110.13×10-6)绢英岩化和次生石英岩阶段迁入(平均 133.06×10-.)配分模式显示轻稀土富集， |
| 英文摘要: |
| The Niukutou deposit in Qinghai Province is located in the eastern part of Qimantage polymetallic metallogenic belt of East Kunlun Orogenic Belt, where magmatic hydrothermal alteration is closely related to the for.mation of the deposit. In this paper, the migration characteristics of granodiorite elements during hydrothermal altera. tion are systematically studied by means of petrographic observation, analysis of major and trace elements and stan.dardized Isocon mass balance calculation. The results showed that in the alteration sequence of fresh granodiorite →weakly altered (skarn) granodiorite → sericodiorite → secondary quartzite, the SiO2 content increased gradually (64.91%-92.01%), and the main elements such as TiO2, Al2O3, TFe2O3, CaO and Na2O significantly moved out, K2O in. creased first and then decreased. Among the trace elements, the ore-forming elements such as Cu, Pb and Zn continue to be brought out during the alteration process, while the large ion lithophile elements such as Rb, Th and U move induring the sericitization stage. The total rare earth element (ΣREE) migrated out in the weak alteration stage (mean 110.13×10..), and migrated in the serictization and secondary quartzite stage (mean 133.06×10..). The partition modelshowed enrichment of light rare earth, deficit of heavy rare earth, and weak Eu negative anomaly. The study revealed the rule of activation and migration of elements in the process of magmatic hydrothermal alteration, indicating that ore-forming elements were enriched and formed ore-bearing fluids in the process of contact alteration between magmatic hydrothermal solution and surrounding rock, and then migrated to favorable position to unload ore-forming. |
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