| 李志强.滇东南红石岩铅锌铜多金属矿床绿帘石岩
地球化学特征及构造背景[J].地质与勘探,2013,49(2):289-299 |
| 滇东南红石岩铅锌铜多金属矿床绿帘石岩
地球化学特征及构造背景 |
| Geochemical Characteristics and Tectonic Setting of Epidote Rocks in the Hongshiyan Pb-Zn-Cu Polymetallic Ore Deposit , Southeastern Yunnan Province |
| 投稿时间：2012-07-28 修订日期：2012-11-01 |
| DOI： |
| 中文关键词: 绿帘石岩 主量元素 微量元素 滇东南 |
| 英文关键词: epidote rocks, major element, trace element, southeastern Yunnan Province |
| 基金项目:云南省地质调查局、昆明理工大学与云南文山州大豪矿业开发有限公司合作项目 |
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| 中文摘要: |
| [摘 要]红石岩矿区处于NW向文山-麻栗坡和SN向马关走滑断裂的交汇处，[摘 要]滇东南红石岩矿区处于NW向文山-麻栗坡和SN向马关走滑断裂的交汇处，受区域动力变质作用和深大断裂的影响，矿区内绿帘石岩较为发育。在总结矿床地质特征的基础上，笔者对矿区绿帘石岩的主量元素、微量元素和稀土元素进行了分析。结果表明：绿帘石岩具富FeO*、MnO、CaO，而Al2O3和TiO2含量较低的特征；大离子亲石元素（LILE）、Th富集，Sr、Ta、Nb、Y等元素亏损，显示火山弧玄武岩的特征，微量元素原始地幔标准化蛛网图呈“隆起”型，高场强元素（HFSE）丰度较低，低场强元素（LFSE）丰度较高，(Rb/Yb)N平均值为31.72≥1，为强不相容元素富集型，稀土元素具有ΣREE较低（平均110.05×10-6）、 LREE富集（LREE/HREE平均8.34）的右倾型,轻重稀土分馏较为明显（(La/Sm)N均值为4.04, ∑Ce/∑Y＞3）。综合主量和微量元素分析，认为研究区绿帘石岩的原岩为弧后盆地拉斑玄武岩。 |
| 英文摘要: |
| Abstract：The Hongshiyan orefield in southeastern Yunnan Province lies in the intersection between the NW-striking Wenshan-Malipo fault and the NS-striking Maguan strike-slip fault. The regional metamorphism and major deep faults exert a critical control on the well-developed epidote rocks. This paper studies the major, trace and rare earth elements of the epidote rocks from the Hongshiyan Pb-Zn-Cu polymetallic ore deposit. The results show that: ① The average composition of the major elements is similar to the volcanic arc basalts, and the FeO*, MnO, and CaO are high, Al2O3 and TiO2 are low. ② Massive meta-basalt is rich in LILE (Rb, Ba,Th), whereas Ta,Nb,Y are depleted, (Rb/Yb)N (31.72 on average), similar to volcanic arc basalts; primitive mantle-normalized diagram shows an uplift pattern. It is enriched in LFSE, relatively depleted in HFSE, similar to back-arc basin basalt. ③REE: ΣREE ratios are relatively low (averagely 110.05×10-6). It is enriched in LREE（LREE/HREE is 8.34 on average; （La/Yb）N＞7), rare earth fractionation is relatively obvious（(La/Sm)N is 4.04 on average; ∑Ce/∑Y＞3）. ④The discrimination diagram of environment structure suggests that the original rock of epidote rocks of the study area is back-arc basin tholeiite. |
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