Nano- to atomic-level analysis of heavy metals in pyrite

黄铁矿中重金属的纳米到原子级分析

• 批准号: 20840035
• 负责人: UTSUNOMIYA Satoshi
• 金额: $ 2.1万
• 依托单位: Kyushu University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Young Scientists (Start-up)
• 财政年份: 2008
• 资助国家: 日本
• 起止时间: 2008 至 2009
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-20840035/
• 关键词: パイライト; TEM; arsenian pyrite; Carlin-type deposit; Nano-scale; Toxic metals

Arsenian pyrite is an important host of Au in the Carlin-type deposit, whereas it always contains significant amount of heavy metals. In order to understand the formation process and the impact to the ambient environment, a detailed examination utilizing a variety of electron microscopy techniques was carried out on the arsenian pyrite collected from various epithermal deposits. New type of arsenian pyrite that contains As^<3+> was characterized in the sample from the Yanacocha deposit. The amounts of defect and the content of other toxic metals increases as the particle size decreases to nanometer size <10 nm. The other finding is a decoupled formation of As and Cu rich pyrite, indicating mixing of two distinct fluid conditions during its formation. In addition, an experimental study revealed the specific As-bearing minerals in the interaction between mackinawite and aqueous As under anoxic condition. Consequently, this project successfully covered a wide range of crystallochemical characteristics of pyrite in the ore deposit.

砷黄铁矿是卡林型矿床中金的重要宿主，但它始终含有大量的重金属。为了了解其形成过程及其对周围环境的影响，利用各种电子显微镜技术对从各种浅成热液矿床中收集的砷黄铁矿进行了详细检查。在来自Yanacocha矿床的样品中表征了含有As 3+ 的新型砷黄铁矿。随着颗粒尺寸减小到纳米尺寸<10 nm，缺陷的数量和其他有毒金属的含量增加。另一个发现是富含砷和铜的黄铁矿的分离形成，表明在其形成过程中存在两种不同的流体条件的混合。此外，一项实验研究揭示了缺氧条件下马基纳维特石与含水砷之间相互作用的特定含砷矿物。因此，该项目成功地涵盖了矿床中黄铁矿的广泛晶体化学特征。

项目成果

Decoupling of Cu and As in Magmatic-hydrothermal systems: Evidence from the Pueblo Viejo Au-Ag Deposit, Dominican Republic. Goldschmidt Conference

岩浆热液系统中铜和砷的解耦：来自多米尼加共和国普韦布洛维耶霍金银矿床的证据。

• 发表时间: 2008
• 作者: Deditius A.P.;Utsunomiya S.;Kesler S.E.
• 通讯作者: Kesler S.E.

Nanoscale geochemistry and mineralogy of arsenian pyrite in ore deposits.

矿床中砷黄铁矿的纳米地球化学和矿物学。

• 发表时间: 2008
• 作者: Deditius A.P.;Utsunomiya S.;Renock D.;Reich M.;Ewing R.C.;Chryssoulis S.L.;Venter D.;Ramana C.V.;Becker U.;Kesler S.E.
• 通讯作者: Kesler S.E.

Behaviour of trace elements in arsenian pyrite in ore deposits

矿床中砷黄铁矿中微量元素的行为

• 发表时间: 2009
• 作者: Deditius A.P.;Utsunomiya S.;Kesler S.E.;Ewing R.C.;Walshe J.
• 通讯作者: Walshe J.

Chemical and structural characterization of As immobilization by nanoparticles of mackinawite (FeSm)

• DOI: 10.1016/j.chemgeo.2009.08.003
• 发表时间: 2009-10
• 期刊: Chemical Geology
• 影响因子: 3.9
• 作者: D. Renock;Tanya J. Gallegos;S. Utsunomiya;K. Hayes;R. Ewing;U. Becker

Decoupling of Cu and As in Magmatic-hydrothermal systems : Evidencefrom the Pueblo Viejo Au-Ag Deposit, Dominican Republic. INVITED

岩浆热液系统中铜和砷的解耦：来自多米尼加共和国普韦布洛维耶霍金银矿床的证据。

• 发表时间: 2008
• 作者: Deditius A. P.;Utsunomiya S.;Kesler S. E.
• 通讯作者: Kesler S. E.