西澳Darling Range地区红土型铝土矿地球化学特征及源区研究
DOI:
作者:
作者单位:

作者简介:

通讯作者:

中图分类号:

基金项目:


Geochemical Characteristics and Source of the Laterite-type Bauxite Deposit in Darling Range, Western Australia
Author:
Affiliation:

Fund Project:

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献
  • |
  • 相似文献
  • |
  • 引证文献
  • |
  • 资源附件
  • |
  • 文章评论
    摘要:

    Darling Range位于西澳大利亚地区,红土型铝土矿资源丰富。本文对Darling Range地区红土型铝土矿及相关岩石开展了元素地球化学分析,并对铝土矿中的碎屑锆石和其下伏的花岗岩开展了LA ICPMS锆石UPb测年,目的是探讨西澳地区红土型铝土矿的成矿作用及其源区。结果表明,西澳地区红土型铝土矿的主量元素以Al2O3、Fe2O3、SiO2和TiO2为主,Al2O3与SiO2呈显著的负相关关系,与TiO2则呈现显著的正相关关系,表明铝土矿的形成过程是一个去Si富Al、Ti的过程。铝土矿微量元素富集Th、U、Nb、Ta、Zr、Hf、Ti,相对亏损Ba、K、Sr、P、Sm;稀土总量较低,为136×10-6~6558×10-6,稀土元素球粒陨石标准化分布曲线略微向右倾斜,富集轻稀土。铝土矿碎屑锆石UPb年龄分布于1167Ma和1267Ma与2539~2696Ma(16颗)两个年龄段,分析锆石来源前者可能来自AlbanyFraser造山带;后者加权平均年龄为2579±15Ma(MSWD=116),与研究区本次获得的太古宙花岗岩加权平均年龄2585±12Ma(MSWD=083)在误差范围内一致,表明铝土矿中的锆石除了来自本区太古宙花岗岩,还有少量的锆石来自AlbanyFraser造山带。结合元素地球化学钛率(Al2O3/TiO2)、lgCrlgNi、微量元素比值、稀土元素配分模式对铝土矿源区进行示踪表明,Darling Range地区的太古宙花岗岩为红土型铝土矿的主要物质来源。

    Abstract:

    Located in western Australia, Darling Range is rich in lateritetype bauxite resources. In order to understand metallogenesis of the lateritetype bauxite in Darling Range and constrain the source of oreforming materials, this study carried out element geochemistry analysis and LA ICPMC dating of detrital zircons from bauxite and underlying granite. The results show that the bauxite in the Darling Range are composed mainly of Al2O3, Fe2O3, SiO2, and TiO2. A12O3 has a negative relationship with SiO2, but a positive relationship with TiO2. It suggests that bauxite experienced the loss of Si and enrichment of Al and Ti during the oreforming process. Geochemical analysis shows that the bauxite is enriched in Th, U, Nb, Ta, Zr, Hf and Ti, and depleted in Ba, K, Sr, P and Sm. The bauxite is characterized by low REE contents from 136 ×10-6 to 6558×10-6, and the chondritenormalized REE pattern slightly tilts to the right and shows enrichment in LREE. LAICPMC detrital zircon UPb ages of the bauxite can be assigned to two groups: 1167~1267 Ma (2 zircons) and 2539~2696 Ma (16 zircons). The former younger detrital zircons possibly came from AlbanyFraser orogeny, while the later older detrital zircons have the weighted average ages of 2579±15 Ma (MSWD=116), consistent with 2585±12 Ma (MSWD=0.83) of Archean granite, with the difference within the error. This indicates that besides the zircons from Archean granite, minor zircons in the lateritetype bauxite may derive from AlbanyFraser orogeny belt. Using Al2O3/TiO2 ratio, lgCrlgNi plot,trace element ratios,and REE pattern to trace the source of lateritetype bauxite deposit, it can be concluded that Archean granite is the major source of oreforming materials for the lateritetype bauxite deposit in the Darling Range of western Australia.

    参考文献
    相似文献
    引证文献
引用本文

孙朋飞,江思宏,韩宁.2018.西澳Darling Range地区红土型铝土矿地球化学特征及源区研究[J].地质学报,92(3):587-603.
SUN Pengfei, JIANG Sihong, HAN Ning.2018. Geochemical Characteristics and Source of the Laterite-type Bauxite Deposit in Darling Range, Western Australia[J]. Acta Geologica Sinica,92(3):587-603.

复制
分享
文章指标
  • 点击次数:
  • 下载次数:
  • HTML阅读次数:
  • 引用次数:
历史
  • 收稿日期:
  • 最后修改日期:
  • 录用日期:
  • 在线发布日期: 2018-03-19
  • 出版日期: