The coupled release of REE and Pb to the soil labile pool with time by weathering of accessory phases, Wind River Mountains, WY

Geochemistry of major and trace elements and Pb–Sr isotopes of a weathering profile developed on the Lower Cambrian black shales in central Hunan, China

“…Therefore, the observed change in the Pb isotope (Fig. 4b, c and d), is attributed to the loss of radiogenic Pb that was preferentially leached during weathering (Harlavan and Erel, 2002;Erel et al, 1994Erel et al, , 2004Harlavan et al, 1998Harlavan et al, , 2009.…”

“…In general, the age and ratios of radioactive parent to daughter elements, such as U/Pb, Th/Pb, and Rb/Sr, in minerals determine Erel et al, 2004;Harlavan et al, 2009). As the thickness of the Dongping profile is approximately 2.5 m (Fig.…”

“…Studies on the Pb-Sr isotope systematics of granitic rock weathering (e.g., Erel et al, 1994Erel et al, , 2004Blum and Erel, 1997;Harlavan and Erel, 2002;Harlavan et al, 2009) suggest that changes in the isotopic composition result from the alteration of specific minerals. For example, high 206 Pb/ 204 Pb and 207 Pb/ 204 Pb values in solution suggest that urogenic minerals such as apatite are preferentially weathered, high 208 Pb/ 204 Pb values suggest that thorgenic minerals such as monazite are preferentially weathered, and high 87 Sr/ 86 Sr values suggest that Rb-rich minerals such as microcline are preferentially weathered (e.g., Blum et al, 1994;Erel et al, 2004;Harlavan et al, 2009).…”

“…For example, high 206 Pb/ 204 Pb and 207 Pb/ 204 Pb values in solution suggest that urogenic minerals such as apatite are preferentially weathered, high 208 Pb/ 204 Pb values suggest that thorgenic minerals such as monazite are preferentially weathered, and high 87 Sr/ 86 Sr values suggest that Rb-rich minerals such as microcline are preferentially weathered (e.g., Blum et al, 1994;Erel et al, 2004;Harlavan et al, 2009). This release of radiogenic Pb-Sr isotopes into solution may cause the weathering products to be enriched with less radiogenic Pb-Sr isotope compositions.…”

Rare earth elements dynamics along pedogenesis in a chronosequence of podzolic soils

“…They form a series that behaves geochemically coherently owing to the small but steady decrease in ionic radius with increase in atomic number (Henderson, 1984, Panahi et al, 2000, Yusoff et al, 2013. They are considered as promising tracers in pedogenesis (Taunton et al, 2000, Aubert et al, 2001, Aide and Smith-Aide, 2003, Chabaux et al, 2003, Compton et al, 2003, Ndjigui et al, 2008, Laveuf and Cornu, 2009, Harlavan et al, 2009, Ma et al, 2011, Gong et al, 2011, Yusoff et al, 2013. The origin of REE in soils lies in the parent material (PM), since anthropogenic sources are restricted (Hu et al, 2006).…”