Evaluating the precision of Pb isotope measurement by mass spectrometry

Abstract

Comparison of analytical precision for radiogenic isotope systems expressed as a percentage of the spread of isotope compositions found in mantle-derived rocks.

The Fate of Contaminants and Stable Pb Isotopes in a Changing Estuarine Environment: 20 Years On

“…Precision of these measurements are nominally 0.1% relative [15]. Analytical methods for cores collected in the early 1990s are reported in full in earlier papers [5,10], but in summary here:…”

“…10 times the precision of conventional single spike methods, to examine multisource inputs of lead [15].…”

Progressive mixed-magma recharging of Izu-Oshima volcano, Japan: A guide to magma chamber volume

“…This is true for Izu arc which is the target of this study (e.g., Ishikawa and Nakamura, 1994;Taylor and Nesbitt, 1998). This across-arc geochemical variation of arc magmas has been interpreted to be caused by a decreasing contribution of slab component toward backarc (Taylor and Nesbitt, 1998), progressive slab dehydration (e.g., Hochstaedter et al, 2001), a change of material released from slab, i.e., hydrous fluid is dominant beneath volcanic front, while siliceous melt is dominant in backarc (Ishizuka et al, 2003;Tollstrup et al, 2010;Kimura et al, 2010). Beside variations caused by slab-derived components, there is the possibility of compositional heterogeneity in the mantle wedge (Hochstaedter et al, 2001;Ishizuka et al, 2003Ishizuka et al, , 2006Machida et al, 2008).…”

“…Across-arc geochemical variation is globally recognised (e.g., Woodhead and Johnson, 1993;Churikova et al, 2001;Peate et al, 1997) with characteristics such as increasing incompatible element concentrations, decreasing large ion lithophile elements (LILEs)/high field strength elements (HFSEs) ratios and less radiogenic Sr, Pb and Nd. This is true for Izu arc which is the target of this study (e.g., Ishikawa and Nakamura, 1994;Taylor and Nesbitt, 1998). This across-arc geochemical variation of arc magmas has been interpreted to be caused by a decreasing contribution of slab component toward backarc (Taylor and Nesbitt, 1998), progressive slab dehydration (e.g., Hochstaedter et al, 2001), a change of material released from slab, i.e., hydrous fluid is dominant beneath volcanic front, while siliceous melt is dominant in backarc (Ishizuka et al, 2003;Tollstrup et al, 2010;Kimura et al, 2010).…”

“…Seeing through to the primary geochemical characteristics is useful when across-and along-arc variation is assessed (e.g., Taylor and Nesbitt, 1998;Ishizuka et al, 2003Ishizuka et al, , 2006Ishizuka et al, , 2007Kimura et al, 2010). In particular, the quantification of slab-derived and mantle wedge inputs with distance from trench (or volcanic front), uses the assumption that each volcano records snapshot of magma production at that position in the transect (e.g., Ishizuka et al, 2003;Tollstrup et al, 2010).…”