The formation of spinel-group minerals in contaminated soils: the sequestration of metal(loid)s by unexpected incidental nanoparticles

被引:15
|
作者
Schindler, Michael [1 ]
Mantha, Haley [2 ]
Hochella, Michael F., Jr. [3 ,4 ]
机构
[1] Laurentian Univ, Dept Earth Sci, Sudbury, ON, Canada
[2] Laurentian Univ, Dept Chem, Sudbury, ON, Canada
[3] Virginia Tech, Dept Geosci, Blacksburg, VA 24061 USA
[4] Pacific Northwest Natl Lab, Subsurface Sci & Technol Grp, Richland, WA 99352 USA
来源
GEOCHEMICAL TRANSACTIONS | 2019年 / 20卷
基金
加拿大自然科学与工程研究理事会;
关键词
Spinels; Contaminated soils; Pedogenic; Mineral nanoparticles; Mineral surface coatings; Organic matter; Low temperature; SURFACE-COATINGS; IRON-OXIDE; ZN; CU; ASSOCIATION; NANOSCIENCE; CHEMISTRY; MAGNETITE; DRAINAGE; MATTER;
D O I
10.1186/s12932-019-0061-3
中图分类号
P3 [地球物理学]; P59 [地球化学];
学科分类号
0708 ; 070902 ;
摘要
Mineralogical studies of contaminated soils affected by smelter emission and dust from mining activities indicate that minerals of the spinel group are one of the common hosts of metal-bearing contaminants. Spinel group minerals typically originate from high temperature processes, but an increasing number of studies indicate that metal-bearing spinel group minerals can also form under ambient Earth surface conditions in surficial soils. In this contribution to honor Donald Sparks, we show that the spinels Zn-bearing magnetite (Zn0.5Fe2.5O4) and minium (Pb3O4) form during low temperature alteration of Pb-bearing silica glass in surficial organic rich soils in proximity to a former Cu-smelter in Timmins, Ontario, Canada. The glass most likely formed during high-temperature processes and has been either emitted by the smelter or wind-blown from waste rock piles to near-by soils. The alteration of the glass by percolating pore solutions has resulted in the formation of large micrometer-size dendritic etch features and in nanometer-size dendritic alteration halos composed of nano-size prismatic crystals of Zn-rich magnetite and spherical nanoparticles of minium. Both spinel-type phases are embedded in an amorphous silica matrix which formed during the alteration of the glass at low temperature. A review on the occurrence of spinel-group minerals in smelter-affected soils or mine tailings indicates that the formation of these minerals under ambient Earth surface conditions is quite common and often results in the sequestration of contaminants such as Cu, Ni, Zn and Sb. The pedogenic spinels often occur as euhedral crystals in nano-size mineral assemblages within alteration features such as dendritic etch patterns, mineral surface coatings and mineralized organic matter. Their well-developed crystal forms indicate that (a) they have not formed during a rapid cooling process in a smelter or refinery which typically creates spherical particulate matter, and (b) they have not been part of particulate matter added via fluvial or Aeolian processes which most commonly yield anhedral morphologies. The formation of nano-size spinel-group minerals in low temperature environmental settings may lead to the long-term storage of metal(loid)s in mineral phases and their transport over vast distances via fluvial, alluvial and Aeolian processes.
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页数:12
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