欢迎访问现代地质!

现代地质 ›› 2015, Vol. 29 ›› Issue (1): 32-44.

• 矿床学 • 上一篇    下一篇

滇东南晚二叠世铝土矿地球化学特征及物源分析

张启明,秦建华,廖震文,刘才泽   

  1. (中国地质调查局 成都地质调查中心,四川 成都610081)
  • 出版日期:2015-01-29 发布日期:2015-04-21
  • 作者简介:张启明,男,工程师,硕士,1978年出生,地球探测与信息技术专业,从事矿产资源调查与评价工作。 Email:solitarystar@126.com。
  • 基金资助:

    中国地质调查局项目(1212011085162,1212011121033)。

Geochemical Characteristics and Material Source of the Late Permian Bauxite Deposits in Southeastern Yunnan Province

ZHANG Qi-ming, QIN Jian-hua, LIAO Zhen-wen, LIU Cai-ze   

  1. (Chengdu Center of Geological Survey, China Geological Survey, Chengdu, Sichuan610081,China)
  • Online:2015-01-29 Published:2015-04-21

摘要:

滇东南地区晚二叠世铝土矿属典型的喀斯特型铝土矿,矿体赋存于上二叠统吴家坪组(龙潭组),分析其地球化学特征对研究其物质来源具有重要意义。全岩分析显示铝土矿石成分以Al2O3、Fe2O3、SiO2和TiO2为主,其中Al2O3与Fe2O3 、SiO2具有较好的负相关关系。微量元素Cr、Zr、 Hf、Ta、Th、U和稀土元素在铝土矿矿化过程中不断富集,元素Zr-Hf、Nb-Ta之间具有明显的正相关关系。lgCr-lgNi图解、稳定元素比值(Zr/Hf)及稀土元素配分模式等地球化学特征说明峨眉山玄武岩为铝土矿的形成提供了主要的物质来源,同时下伏碳酸盐岩也提供了部分成矿物质。

关键词: 铝土矿, 地球化学, 物质来源, 滇东南

Abstract:

The bauxite deposits in southeastern Yunnan Province are typical karst bauxite deposits. The orebo-dies occur in the Upper Permian Wujiaping Formation (Longtan Formation). It is significant to analyze geochemical characteristics of this deposit for the material source of bauxite ores. Whole rock analysis reveals Al2O3, Fe2O3 , SiO2 and TiO2 are the main components of the bauxite ores. And Al2O3 has a negative relationship with Fe2O3 and SiO2. Trace elements such as Cr, Zr, Hf, Ta, Th, U and REE were enriched during the bauxitization process. Elements of Zr and Hf, Nb and Ta display significant correlation with each other. Studies of bivariate plots of lgCr-lgNi, immobile elements ratios such as Zr/Hf, and REE pattern suggest that the Emeishan basalts are the major source of materials for the bauxite formation. And the underlying limestones may provide some source of materials for the formation of bauxite ores.

Key words: geochemistry, source of ore-forming materials, southeastern Yunnan Province

中图分类号: