Download presentation
Presentation is loading. Please wait.
Published byPaulina Lang Modified over 9 years ago
1
Source: Stewart et al., 2001
2
Strontium vs. Calcium Both are alkaline earth elements with +2 valence charge Strontium –Atomic number = 38 –Ionic Radius = 1.18 angstroms Calcium –Atomic number = 20 –Ionic Radius = 1.00 angstroms
3
Source: Kennedy et al., 2002
4
Source: Capo et al., 1998
7
Strontium Isotope System Indicator of both age and geochemical origin –Older rocks with same initial Rb/Sr will have higher 87 Sr/ 86 Sr than younger ones. –Rocks of a given age composed of different minerals will show differentiation in strontium ratios –The combination of these factors allows strontium to be used a tracer of cation source
8
Source: Capo et al., 1998
9
Strontium as a Tracer of Soil Cation Source: Weathering vs. Atmospheric Deposition Mass Balance – Two Member Mixing Must have sufficient difference between the two end members Must assume steady-state weathering or use more complex models to simulate changes in end members
10
Source: Bullen et al., 1997
11
Source: White et al., 1999
12
Source: Blum et al., 2002
13
Source: Kennedy et al., 2002
15
Figure 2: Location of proposed field sites in the San Juan Mountains in relation to the western US deserts. Field Sites
17
87/86 Sr 143/144 Ndε Nd Surface rocks0.707397 (0.000013)0.512216-8.23 Dust Events April 1, 20050.720471 (0.000013)0.512089-10.71 April 4, 20050.716402 (0.000012)0.512084-10.81 April 8, 20050.714878 (0.000009)0.512104-10.42 May 9, 20050.713525 (0.000007)0.512103-10.44
20
Source: Chadwick et al., 1999
21
Source: Stewart et al., 2001
Similar presentations
© 2025 SlidePlayer.com. Inc.
All rights reserved.