| 薛伟,沈忠义,郭玉乾,孙玉海,折士焜,帅磊.云南省富宁县毛姐山金矿床基性侵入岩地球化学特征及其地质意义[J].矿产勘查,2025,16(8):1908-1917 |
| 云南省富宁县毛姐山金矿床基性侵入岩地球化学特征及其地质意义 |
| Geochemical characteristics and geological significance of mafic intrusive rocks in Maojieshan gold deposit, Funing County, Yunnan Province |
| 投稿时间：2024-04-02 |
| DOI：10.20008/j.kckc.202508007 |
| 中文关键词: 基性侵入岩 地球化学特征 富宁地区 金矿床中图分类号:P618.2文献标志码:A文章编号:1674-7801(2025)08-1908-10 |
| 英文关键词: mafic intrusive rock geochemical characteristics Funing area gold deposit |
| 基金项目:本文受云南省富宁县毛姐山金矿控矿因素与找矿方向研究项目资助。 |
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| 中文摘要: |
| 滇东南富宁地区位于“滇黔桂金三角”南部，大地构造位置处于古特提斯构造域与环太平洋构造域的复合部位，区内基性岩浆活动发育，分布着一系列以基性岩为容矿岩石的金矿床(点)。本文对区内毛姐山金矿矿区基性侵入岩研究后发现:侵入岩主要成分为辉石和斜长石，岩性为辉长岩、辉长辉绿岩和辉绿辉长岩；岩石主量元素 SiO2含量为 41.42%~46.3%，K2O+Na2O含量为 2.61%~4.33%，TiO2含量为 1.93%~5.75%，为高钛、相对低 SiO2、相对富集 Fe2O3的高钾钙碱性碱性岩系列基性岩；岩石稀土配分模式为右倾、轻稀土 LREE富集；微量元素表明岩石 Nb相对弱亏损、Ta富集，并且具有正 Eu异常的特征。结合区域基性岩年代学及地球化学研究成果，认为基性侵入岩成岩时代可能为 258~241 Ma，形成于伸展的大陆板内构造背景，其成岩时代与金矿化时代相差较大，对金成矿的贡献较小。 |
| 英文摘要: |
| The Funing area in the southeast of Yunnan is located in the southern part of the "Yunnan-Guizhou-Guangxi Golden Triangle". It is situated at the junction of the ancient Tethys tectonic domain and thecircum-Pacific tectonic domain. Within the region, there is developed basic magmatic activity, and a series of gold deposits (points) are distributed, with basic rocks serving as the host rocks for the ores. After studying the basic in-trusive rocks in the Maojie Mountain gold mine area, it was found that the main components of the intrusive rocksare pyroxene and plagioclase, with the rock types being gabbro, norite, and monzogabbro. The major elements indi-cate that the rocks have a SiO2 content of 41.42% to 46.3%, a K2O+Na2O content of 2.61% to 4.33%, and a TiO2 content of 1.93% to 5.75%, classifying them as high-titanium, relatively low-SiO2, and relatively enriched in Fe2O3,high-potassium calc-alkaline series of basic rocks. The rare earth element (REE) distribution pattern of the rocks isright-skewed, with an enrichment of light rare earth elements (LREE). Trace elements show that the rocks are rela-tively deficient in Nb, enriched in Ta, and have a positive Eu anomaly. Combining the regional basic rock geochro-nological and geochemical research results, it is believed that the crystallization age of the basic intrusive rocks maybe 258-241 Ma, formed in the tectonic setting of an extended continental plate, with a significant difference in tim-ing from the gold mineralization age, suggesting a minimal correlation with the gold mineralization process. |
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