10.6084/m9.figshare.3452945.v1
Jamil A. Sader
Jamil A.
Sader
Keiko H. Hattori
Keiko H.
Hattori
Julie M. Kong
Julie M.
Kong
Stewart M. Hamilton
Stewart M.
Hamilton
Kerstin Brauneder
Kerstin
Brauneder
Geochemical responses in peat groundwater over Attawapiskat kimberlites, James Bay Lowlands, Canada and their application
to diamond exploration
Geological Society of London
2016
LREE
decrease metal solubility
peat groundwater geochemical parameters
kimberlite pathfinder metals
diamond exploration ABSTRACT Peat groundwater compositions
kimberlite margins
EC
ombrotrophic peat groundwaters
James Bay Lowlands
kimberlite pathfinder metals Ni
diamond exploration applications
Geology
2016-06-22 10:49:01
Dataset
https://geolsoc.figshare.com/articles/dataset/Geochemical_responses_in_peat_groundwater_over_Attawapiskat_kimberlites_James_Bay_Lowlands_Canada_and_their_application___to_diamond_exploration/3452945
<p><strong>ABSTRACT</strong> Peat groundwater compositions at depths of 0.4 and 1.1 m below ground surface in the Attawapiskat region of the James Bay
Lowlands are evaluated for diamond exploration applications. Samples were collected along transects that typically extended
at least 200 m beyond the margins of Yankee, Zulu, and Golf kimberlites. Locations of upwelling groundwater usually occur
at or near kimberlite margins based on hydrogeological measurements and variations in peat groundwater geochemical parameters
(pH and EC are high, and the Eh is low relative to ombrotrophic peat groundwaters). Concentrations of the kimberlite pathfinder
metals Ni, Cr, light rare earth elements (LREEs), Ba, Mg/Ca, and alkalis are commonly elevated at sample sites at or near
kimberlite margins and where groundwaters are upwelling. The presence of elevated kimberlite pathfinders at these sites suggests
that fractures along the boundaries between kimberlites and limestone formed during kimberlite emplacement provide dilation
for upward movement of groundwater with elevated kimberlite pathfinder metals. Typically, Ni, Cr, LREE, and Ba behave similarly
and thus high concentrations of these metals are found at similar locations along transects. On the other hand, locations
of elevated alkalis and Mg/Ca vary. The spatial variations among pathfinder metals in peat groundwaters are possibly due to
geochemical processes in the peat, such as metal binding to dissolved organic material, adsorption to insoluble organics or
Fe-oxyhydroxides, and incorporation into secondary mineral precipitates, which can act to increase or decrease metal solubility.
The findings of this study are readily applicable in diamond exploration in wetlands elsewhere.
</p>