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Thus, targeting individual minerals for LA-Q-ICP-MS trace-element or isotope measurements necessitates crater diameters in the 20 (or less) to 70 µm range.

The selected samples contain predominantly five minerals that comprise 95% of the rock: pyrite, sphalerite, galena, chalcopyrite, and pyrrhotite.

LA-ICP-MS developments continue to be made in terms of Pb-isotope determination [4,5,20].

For example, a comparison study by [20] demonstrated the feasibility of analysing Pb ores (galena) by LA sector-field (SF) ICP-MS.

The Bathurst Supergroup including Tetagouche, California Lake, and Sheephouse Brook groups, hosted the massive sulphides of the BMC [21].

Thus, it is theoretically possible to obtain high-precision (≤0.1% 2σ) Pb-isotope ratios with LA Q-ICP-MS by targeting Pb-rich minerals and optimizing ablation and collection conditions to generate near-steady-state low %RSD signals.

The initial Pb isotope composition of an ore fluid is best determined from Pb-rich minerals genetically associated with the mineralizing event, e.g., galena (initial U/Pb = 0) [6,7,8,9,10,11] as well as pyrite [4,5,12,13,14,15,16,17], sphalerite [18], chalcopyrite, and pyrrhotite [19].

In contrast to conventional whole-rock Pb isotope determination of sulphides, which suffers from laborious sample preparation procedures as well as mixing of sulphide phases of potentially disparate petrogenesis, micro-analytical techniques offer the advantage of better textural and intragranular control on the selection of target material.

Minor amounts of arsenopyrite, marcasite, and tetrahedrite-tennantite, are also present and sulphosalts occur at trace levels.

In the VMS deposits of the BMC, galena occurs as blebs, veins, disseminations, and inclusions associated with other phases.

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