Genesis of Quartz⁃Zinnwaldite⁃Topaz Porphyritic Rocks from the Zhengchong Lithium⁃Rubidium⁃Cesium Deposit, Nanling Region

Liu Xianghua; Xu Jinmei; Wei Guimei; Lin Shouhong; Tang Han; Zhang Bo; Lai Jianqing; Li Bin

doi:10.3799/dqkx.2025.245

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Genesis of Quartz⁃Zinnwaldite⁃Topaz Porphyritic Rocks from the Zhengchong Lithium⁃Rubidium⁃Cesium Deposit, Nanling Region

更新时间：2026-10-15

- Genesis of Quartz⁃Zinnwaldite⁃Topaz Porphyritic Rocks from the Zhengchong Lithium⁃Rubidium⁃Cesium Deposit, Nanling Region
- Earth Science Vol. 51, Issue 9, Pages: 3484-3500(2026)
- 作者机构：
  
  1.广西民族大学智能建造学院，广西南宁 530006
  2.中南大学地球科学与信息物理学院，湖南长沙 410083
  3.紫金矿业集团股份有限公司，福建上杭 361008
  4.湖南省地球物理地球化学调查所，湖南长沙 410014
- 作者简介：
- 基金信息：
- DOI：10.3799/dqkx.2025.245
  CLC： P611.1
- Received：30 July 2025，
  
  Published：30 September 2026
- 稿件说明：
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刘湘华，许金梅，韦桂妹，林寿洪，唐汉，张博，赖健清，李斌，2026.南岭地区正冲锂铷铯矿床云英斑岩成因.地球科学，51（9）：3484-3500.

Liu Xianghua，Xu Jinmei，Wei Guimei，Lin Shouhong，Tang Han，Zhang Bo，Lai Jianqing，Li Bin，2026.Genesis of Quartz⁃Zinnwaldite⁃ Topaz Porphyritic Rocks from the Zhengchong Lithium⁃Rubidium⁃Cesium Deposit， Nanling Region.Earth Science，51（9）：3484-3500.
刘湘华，许金梅，韦桂妹，林寿洪，唐汉，张博，赖健清，李斌，2026.南岭地区正冲锂铷铯矿床云英斑岩成因.地球科学，51（9）：3484-3500. DOI： 10.3799/dqkx.2025.245.

Liu Xianghua，Xu Jinmei，Wei Guimei，Lin Shouhong，Tang Han，Zhang Bo，Lai Jianqing，Li Bin，2026.Genesis of Quartz⁃Zinnwaldite⁃ Topaz Porphyritic Rocks from the Zhengchong Lithium⁃Rubidium⁃Cesium Deposit， Nanling Region.Earth Science，51（9）：3484-3500. DOI： 10.3799/dqkx.2025.245.

摘要

湖南道县正冲锂铷铯矿床是南岭地区正在开发的大型稀有金属矿床，成矿地质体主要为全岩矿化的云英斑岩. 目前，对于该矿床云英斑岩的成因仍存在争议：岩浆成因或交代成因？南岭地区此类特殊云英岩是稀有金属矿化的重要载体，其成因研究对完善稀有金属成矿机制具有重要意义. 基于野外地质调查与室内测试分析，本文认为该云英斑岩不是云英岩化的产物，主要证据有：（1）云英斑岩和花岗岩（或花岗斑岩）接触界线的矿物比例呈突变特征，且存在花岗岩捕掳体；（2）云英斑岩具有典型斑状结构，斑晶多呈自形，常见矿物‒熔体包裹体，石英斑晶阴极发光（CL）图像显示原生生长环带；（3）石英Al元素含量较均一，Ti元素平均含量高达21.8 μg/g；（4）云母几乎全为铁锂云母，白云母少见，且铁锂云母F元素含量较高，结合黄玉中F元素含量较低的特征，两者显示岩浆成因；（5）独居石未见热液蚀变结构或蚀变矿物，具有岩浆成因地球化学特征；（6）全岩Y/Ho、Nb/Ta比值与稀土四分组效应TE

1‒3

值显示硅酸盐熔体微量元素地球化学特征，不同于存在显著岩浆‒热液蚀变作用的花岗质岩石或云英岩. 地球化学模拟结果表明，云英斑岩可能是金鸡岭复式岩体多级原地结晶作用的产物.

Abstract

The Zhengchong lithium-rubidium-cesium deposit in Daoxian County

Hunan Province

is a large rare metal deposit being developed in the Nanling region. The ore-forming geological body is dominated by pervasively mineralized quartz-zinnwaldite-topaz porphyritic rocks. However

the genesis of the quartz-

zinnwaldite-topaz porphyritic rocks in this deposit remains controversial: magmatic versus metasomatic origin. It is essential to elucidate their genesis for refining the metallogenic mechanisms of rare metal deposits

since such distinctive greisen-type rocks in the Nanling region are critical hosts for rare metal mineralization. Based on field geological investigations and laboratory analyses

it is concluded that the quartz-zinnwaldite-topaz porphyritic rocks are not products of greisenization. The principal lines of evidence are as follows: (1) the contact boundary between the quartz-zinnwaldite-topaz porphyritic rocks and granites (or granite porphyries) is marked by an abrupt change in mineral proportions

and granite xenoliths occur within the quartz-zinnwaldite-topaz porphyritic rocks; (2) the quartz-zinnwaldite-topaz porphyritic rocks display a typical porphyritic texture with mostly euhedral phenocrysts

in which mineral-melt inclusions are widely developed. Cathodoluminescence (CL) images of quartz phenocrysts reveal primary growth zoning; (3) Al contents in quartz are relatively homogeneous

with an average Ti content as high as 21.8 μg/g; (4) micas are dominated by zinnwaldite with scarce muscovite. The high F content of zinnwaldite and the low F content of coexisting topaz collectively support a magmatic origin; (5) monazite lacks hydrothermal alteration textures and alteration minerals

with magmatic geochemical characteristics; (6) whole-rock Y/Ho

Nb/Ta ratios

and TE

1-3

values (the deviation of the first and third tetrad of granite REE patterns from a hypothetical tetrad effect-free REE pattern) show characteristic behavior of trace elements in silicate melts

which differ from those of granitic rocks or greisens that have undergone significant magmatic-hydrothermal alteration. Geochemical modeling results indicate that the quartz-zinnwaldite-topaz porphyritic rocks are likely formed by multistage in situ crystallization of the Jinjiling complex.

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