A new type of Nb (Ta)–Zr(Hf)–REE–Ga polymetallic deposit in the late Permian coal-bearing strata, eastern Yunnan, southwestern China: Possible economic significance and genetic implications
A new type of Nb (Ta)–Zr(Hf)–REE–Ga polymetallic deposit in the late Permian coal-bearing strata, eastern Yunnan, southwestern China: Possible economic significance and genetic implications
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DOI：
10.1016/j.coal.2010.04.002
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发表时间：
2010-07
影响因子：
5.6
通讯作者：
S. Dai;Yiping Zhou;Mingquan Zhang;Xibo Wang;Jumin Wang;Xiaolin Song;Yao-fa Jiang;Yangbing Luo-
中科院分区：
文献类型：
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作者：
S. Dai;Yiping Zhou;Mingquan Zhang;Xibo Wang;Jumin Wang;Xiaolin Song;Yao-fa Jiang;Yangbing Luo-
本文描述了中国西南部云南东部晚二叠世含煤地层中的一种新型火山成因 Nb(Ta)-Zr(Hf)-REE-Ga 多金属矿床。测井数据（特别是天然伽马射线）、地球化学数据（高浓度的Nb、Ta、Zr、Hf、REE和Ga）和矿物成分（很少观察到的含Nb（Ta）-、Zr（Hf）-或稀土矿物）以及火山岩性特征表明，下部存在厚（1-10m，大多是2-5m）矿床。 宣威组（晚二叠世）位于中国西南部云南省东部。矿床富含 (Nb,Ta)2O5 (302–627ppm)、(Zr,Hf)O2 (3805–8468ppm)、REE（La–Lu+Y 氧化物）(1216–1358ppm) 和 Ga (52.4–81.3ppm)。矿层主要由石英、伊利石-蒙皂石混层、高岭石、贝蒂石、钠长石组成。研究区确定了四种类型的矿床，即粘土蚀变火山灰、凝灰质粘土、凝灰岩和火山角砾岩。初步研究表明，高浓度的稀有金属主要来自碱性火山碎屑岩。但稀有金属的赋存模式、空间分布和富集机制有待进一步研究。
This paper describes a new type of Nb(Ta)–Zr(Hf)–REE–Ga polymetallic deposit of volcanic origin in the late Permian coal-bearing strata of eastern Yunnan, southwestern China. Well logging data (especially natural gamma-ray), geochemical data (high concentrations of Nb, Ta, Zr, Hf, REE, and Ga) and mineralogical compositions (Nb(Ta)-, Zr(Hf)-, or REE-bearing minerals rarely observed), together with the volcanic lithological characteristics indicate that there are thick (1–10m, mostly 2–5m) ore beds in the lower Xuanwei Formation (late Permian) in eastern Yunann of southwestern China. The ore beds are highly enriched in (Nb,Ta)2O5(302–627ppm), (Zr,Hf)O2(3805–8468ppm), REE (oxides of La–Lu+Y) (1216–1358ppm), and Ga (52.4–81.3ppm). The ore beds are mainly composed of quartz, mixed-layer illite–smectite, kaolinite, berthierine, and albite. Four types of ore beds in the study area were identified, namely, clay altered volcanic ash, tuffaceous clay, tuff, and volcanic breccia. Preliminary studies suggest that the high concentrations of otherwise rare metals were mainly derived from the alkalic pyroclastic rocks. The modes of occurrence, spatial distribution, and enrichment mechanism of the rare metals, however, require further study.