LA-ICP-MS analysis of single fluid inclusions in a quartz crystal (Madan ore district, Bulgaria)

A reappraisal of decrepitation-inductively coupled plasma spectroscopy (D-ICP) for the bulk analysis of fluid inclusions in minerals

“…A very detailed study on the tectonometamorphic evolution, geochronology, and epithermal ore deposition in the Rhodopian metamorphic complex was published by Kaiser Rohrmeier et al 11 Although the deposits are spread over a signicant area of about 300 km 2 , they are very similar, either as mineral assemblages or in respect to the mineral-forming conditions, probably due to a common heat source and identical parent rocks. Piperov 12 reviewed lots of published T h (temperature of homogenization) and salinity data derived from microthermometric measurements, while more modern results were reported by Kostova et al 13 and Kotzeva et al 14 The ore stages in all Madan deposits display T h ¼ 200-350 C and a total salinity of 3-9 wt%, but in some cases (sphalerite, unpublished data), up to 12 wt%. This similarity between the ore-forming conditions offers a good opportunity to use the data from different deposits as a reliable base for comparison.…”

“…On that account, the base opaque part of the crystals is about an order of magnitude more inclusions abundant than the transparent tip part. 14 Excluding the near-to-surface vacuoles, all the other inclusions are three-phase: V + W + S, i.e. they contain a very small (mm sized), not identied, and most probably trapped solid phase.…”

“…The uid inclusions in the opaque parts of the crystals represent more than 90% of the inclusion bulk. In a recent publication, 14 it was shown that even for different types, these inclusions (n ¼ 51) contain a relatively homogeneous solution with a trapping temperature between 329 and 348 C, with a mode at 338 C. Some inclusions in the transparent zones (late) display a lower T h : 320-312 C. The microcryometry revealed a total salinity in the range of 5.7-9.1 wt%, with a mode of 8.5 wt% NaCl-equivalent.…”

TERMITE: An R script for fast reduction of laser ablation inductively coupled plasma mass spectrometry data and its application to trace element measurements

“…For line scans, the ablation time on the sample is usually longer than on the reference materials. However, for specific samples, such as dust, ostracods or inclusions, the line scan on the sample may also be shorter than the measurements on the reference material. Therefore, the signal length must be adjusted individually for each measurement (e.g., sample, reference material), slightly reducing the high throughput benefit of TERMITE evaluating spot analyses.…”

Contrasting regimes of Cu, Zn and Pb transport in ore-forming hydrothermal fluids

“…The metal concentration data of natural fluids are mainly from the compilation of Yardley (2005), including single fluid inclusion analysis, bulk crush leaching analysis, and direct sampling of hot springs and basinal brines. These data were combined with metal concentrations in single fluid inclusions obtained using LA-ICP-MS and PIXE (Carpenter et al 1974;Bottrell and Yardley 1988;Williams and McKibben, 1989;Heinrich et al 1992;Campbell et al 1995;Munz et al 1995;Smith et al 1996;Meere and Bank, 1997;Audétat et al 2000;Banks et al 2000;McCaig et al 2000;Zaw et al, 2003;Beuchat et al, 2004;Rusk et al, 2004;Bakker et al, 2006Bakker et al, , 2008Stoffell et al, 2008;Bertelli et al, 2009;Appold and Wenz, 2011;Kotzeva et al, 2011;Catchpole et al, 2011;Leisen et al, 2012;Li et al, 2012;Miron et al, 2013). The Cu, Zn and Pb concentrations of these natural fluids are plotted as a function of the estimated fluid temperature in Fig.…”