Combined boron, radiogenic (Nd, Pb, Sr), stable (C, O) isotopic and geochemical investigations of carbonatites from the Blue River Region, British Columbia (Canada): Implications for mantle sources and recycling of crustal carbon

Çimen, Okay; Kuebler, Corinne; Simonetti, Stefanie S.; Corcoran, Loretta; Mitchell, Roger H.; Simonetti, Antonio

doi:10.1016/j.chemgeo.2019.07.015

Cited by 19 publications

(2 citation statements)

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“…To better detail the mineralogical and textural associations and geochemical variability across the deposit, we additionally employed micro-X-ray fluorescence imaging. Elemental maps of 14 sample offcuts representing the different lithologies and mineralizing styles of Tullacondra were produced by Edax Orbis micro-XRF instrument at the Center for Environmental Science and Technology (CEST), University of Notre Dame, U.S.A. Analytical parameters included a beam size of 30 µm, 40 kV accelerating voltage, and 300 µA current [52,53]. Chemical maps were produced for the following elements: Cu, S, Al, Fe, Ca, P, As, K, Mg, Mn, Si, Ti, and Zn, and ternary RGB images of Ca, Al, and Cu were subsequently generated using ImageJ software to discriminate between carbonates (Ca), silicates (Al), and sulfides (Cu).…”

Section: Methodsmentioning

confidence: 99%

The Carbonate-Hosted Tullacondra Cu-Ag Deposit, Mallow, Ireland

et al. 2021

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The Tullacondra Cu-Ag deposit is located on the southern margin of the Lower Carboniferous Irish Midlands orefield and contains historical reserves of approximately 4.2 Mt at 0.7% Cu and 27.5 ppm Ag. The deposit is hosted within the hanging wall of a feeder fault, the EW-trending Tullacondra Fault, where sulfides and sulfosalts containing elevated Cu, Ag, As, and Sb deposited, whereas Zn and Pb are nearly absent. The deposition of Cu sulfides in Tullacondra took place along bedding and bedding-parallel dissolution seams, suggesting an epigenetic mineralization that formed: (a) the Transition Series-hosted mineralized zone containing elevated Cu associated with Ag, As, and Sb; (b) the Lower Limestone Shale-hosted mineralized zone, Cu-dominated and depleted in other metals, and (c) a near-vertical mineralized zone associated with fractures related to the Tullacondra Fault. Some similarities are shared with Irish-type Zn-Pb deposits, such as structural and stratigraphic controls, and elevated Cu, Ag, As, and Sb within feeder-fault proximal zones (such as in Lisheen and Silvermines). Whether Tullacondra mineralization was part of the Irish-type system or not, our deposit geometry evaluation, whole-rock geochemistry, paragenetic sequence, and texture relationships indicate that Cu-Ag deposition involved the reaction of metal-bearing fluids with carbonate rocks.

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Section: Methodsmentioning

confidence: 99%

The Carbonate-Hosted Tullacondra Cu-Ag Deposit, Mallow, Ireland

et al. 2021

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“…Figure 12.Carbon and oxygen isotopic compositions for carbonate separates of Özvatan carbonatite samples. The worldwide carbonatite and primary igneous carbonatite data are from Deines[73] and Cimen et al[74,75]. The isotopic data of primary igneous carbonatite complexes of Fen and Alnö is taken from Andersen[76] and Roopnarain[77], respectively.…”

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The Evolution of the REE-Bearing Özvatan Nepheline Syenite-Carbonatite Complex, Central Turkey: Mineralogical, Geochemical, and Stable Isotopic Approaches

et al. 2023

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Carbonatite complexes and associated fenite zones are famous for their high-grade rare metal ores. The carbonatite–fenite complexes generally contain high concentrations of light rare earth elements (LREE), thorium (Th), and uranium (U). While most carbonatites are closely related to continental rift zones, some complexes can be observed in post-collisional tectonic environments. The Özvatan nepheline syenite–carbonatite complex is an example of post-collisional carbonatitic magmatism in Central Anatolia, Turkey. The magmatic suite is generally composed of silica-undersaturated ultra-alkaline rocks and carbonatite dikes accompanied by high-intensity fenite zones. The carbonatites of the complex are generally dominated by coarse-grained calcite minerals accompanied by fluorite phenocrysts and may also contain minor amounts of rock-forming silicate minerals. The metasomatic aureole zones (fenites) are mainly composed of euhedral nephelines, K-feldspars, aegirines, augites, and garnets. Carbonatites of the Özvatan complex show enrichments in Ca and F with depletion of alkaline (K and Na) elements. Carbonatites and fenite zones of the Özvatan complex host a variety of incompatible elements, including La, Ce, Nd, Th, U, and Nb. The isotopic composition and general geochemical properties of carbonatites in the study area represent mantle-derived carbonatites rather than crustal limestones/skarns.

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