Chlorine isotopic geochemistry of salt lakes in the Qaidam Basin, China

Precise measurement of chlorine stable isotopic ratios by thermal ionization mass spectrometry.

“…Chlorine isotopic composition in seawater is homogeneous (δ 37 Cl: 0‰), and the variations in brine and halite is small (in most of the case δ 37 Cl: -1 to +1‰, Eggenkamp et al, 1995;Liu et al, 1997). Difference in raw materials would not be enough to explain the variation.…”

“…The chlorine isotopes are chiefly fractionated by phase change of Clbearing materials, e.g., evaporites crystallized from brine (Vengosh et al, 1989;Eggenkamp et al, 1995;Liu et al, 1997;Lyons et al, 1999), reaction between hydrous silicate minerals and aqueous phase (Eastoe and Guilbert, 1992;Magenheim et al, 1995;Ransom et al, 1995), and volatilization of HCl from acidic aerosols Volpe et al, 1998;Lyons et have resulted in many environmental problems. Tanaka and Rye (1991) reported large variations of Cl isotopic compositions in some volatile organic compounds, and suggested that it could be used to quantify the flux of stratospheric Cl derived from artificial chlorinated compounds.…”

“…It has been used successfully in the investigation of brines (Liu et al, 1997), aerosols (Magenheim et al, 1994;Volpe and Spivack, 1994;Volpe et al, 1998), rocks (Magenheim et al, 1994;Magenheim et al, 1995;Boudreau et al, 1997;Banks et al, 2000), and subduction-zone pore waters (Ransom et al, 1995) in magnetic scanning (peak jumping) mode.…”

Chlorine isotopes of thermal springs in arc volcanoes for tracing shallow magmatic activity

“…A few measurements on eclogite-facies mica schists, which are considered to represent the deeply subducted marine sediments, show δ 37 Cl range from −2.2 to +2.2h with average value of −0.04h (John et al, 2010). Chlorine in altered oceanic crust (AOC) has δ 37 Cl varying from −3.2 to +1.5h (Volpe and Spivack, 1994;Volpe et al, 1998;Koehler and Wassenaar, 2010); (2) sediments, including evaporites (Kaufmann et al, 1984;Eggenkamp and Schuiling, 1995;Liu et al, 1997;Eastoe et al, , 2001Eastoe et al, , 2007Eastoe and Peryt, 1999;Arcuri and Brimhall, 2003;Tan et al, 2006;Barnes et al, 2008Barnes et al, , 2009b; (3) pore water (Desaulniers et al, 1986;Eggenkamp et al, 1994;Ransom et al, 1995;Hendry et al, 2000;Hesse et al, 2000;Coleman et al, 2001;Spivack et al, 2002;Deyhle et al, 2004;Godon et al, 2004a;Lavastre et al, 2005;Bonifacie et al, 2007b;Wei et al, 2008); (4) groundwater (Kaufmann et al, 1984(Kaufmann et al, , 1993Eastoe et al, , 2001Sie and Frape, 2002;Shouakar-Stash et al, 2007;Zhang et al, 2007;Stotler et al, 2010); (5) altered basalts (Sharp et al, 2007;Bonifacie et al, 2008b;Layne et al, 2009;Barnes and Cisneros, 2012); (6) serpentinite (Barnes et al, , 2008(Barnes et a...…”

Natural Variations of Stable Chlorine and Bromine Isotopes on Earth

“…In these studies (Xiao et al , 2000Liu et al 1997;Tan et al 2005Tan et al , 2006Tan et al , 2009Luo et al 2012) it was found that the chlorine isotope variations in the basins are large. In these studies a good correlation was found between the chloride contents and the δ 37 Cl of lake brines, where in the most concentrated brines very low δ 37 Cl values of less than −2 ‰ were found.…”