Isotope Geochemistry
W. M. White
Chapter 4
GEOCHRONOLOGY III: OTHER DATING METHODS
4.1 COSMOGENIC NUCLIDES
4.1.1 Cosmic Rays in the Atmosphere
As the name implies, cosmogenic nuclides are produced by cosmic rays colliding with atoms in the
atmosphere and
Isotope Geochemistry
Chapter 3
Geochronology II
DECAY SYSTEMS AND GEOCHRONOLOGY II: U AND TH
3.1 INTRODUCTION
The U-Th-Pb system is certainly the most powerful tool in the geochronologist's tool chest. While we
can use the three decay systems independentl
Isotope Geochemistry
W. M. White
Chapter 2
DECAY SYSTEMS & GEOCHRONOLOGY I
2.1 BASICS OF RADIOACTIVE ISOTOPE GEOCHEMISTRY
2.1.1 Introduction
We can broadly define two principal applications of radiogenic isotope geochemistry. The first is geochronology. G
Isotope Geochemistry
W. M. White
Chapter I
ATOMS AND NUCLEI: THEIR PHYSICS AND ORIGINS
1.1 INTRODUCTION
Isotope geochemistry has grown over the last 50 years to become one of the most important fields in
the earth sciences as well as in geochemistry. It h
Geol. 656 Isotope Geochemistry
Problem Set 4
Due Mar 6, 2013
1. Using the data below from core KH711-11 from Tanaka and Inuoe (1979), calculate the sedimentation
rate assuming constant flux and constant sedimentation. (This is the data set plotted in Figu
Geol. 656 Isotope Geochemistry
Problem Set 3 Solution
Due Feb 25, 2013
1. The following were measured on a coarse grained metagabbro from Cana Brava complex in central
Brazil. Plot the data on an isochron diagram, calculate the age, errors on the age, and
Geol. 656 Isotope Geochemistry
Problem Set 2 Solution
Due Feb. 11, 2013
1. Use Dodsons equation (equation 2.37) to calculate the closure temperatures of biotite for the cases of
a slowly cooled intrusion discussed in Section 2.3.1, namely at 10/Ma and 100
Geol. 656 Isotope Geochemistry
Problem Set 1 Solution
Due Feb. 4, 2013
1. Both 122Te and 123Te are created only in the s-process. 122Te constitutes 2.55% of Te and 123Te
constitutes 0.89% of Te. What was the ratio of capture cross sections of these nuclid
EAS 4550: Geochemistry
Problem Set Five
Due Oct. 9, 2013
1. Use the web applet version of MELTS (http:/melts.ofmresearch.org/index.html) to answer the following questions. MidOcean Ridge Basalt (MORB) glass has the average composition shown
in the adjacen
EAS 4550: Geochemistry
Problem Set 4
Due October 2, 2013
2
3
G ex = BX2 + CX2 + DX2
G ex = (WG1 X2 + WG2 ) X1 X2
reduces to:
1. Show that:
with appropriate substitution for a binary system in which X1 = 1-X2.
2. Interaction parameters for the enstatitedio
Geological Sciences 4550:
Geochemistry
Problem Set 3 Solutions
Due Sept. 25, 2013
1. The following analysis of water is from the Rhine River as it leaves the Swiss Alps:
HCO
3
Cl
Ca
2+
Na
113.5 ppm
1.1 ppm
40.7 ppm
+
1.4 ppm
SO 2
4
NO
3
Mg
K
2+
+
36.0
Geological Sciences 4550:
Geochemistry
Problem Set 2 Solutions
Due Sept. 18, 2013
1. a.) Using the enthalpies of formation given in Table 2.02, find H in Joules for the reaction:
albite jadite + quartz
NaAl2Si2O8 NaAl2SiO6+ SiO2
b.) Which assemblage (side
Geological Sciences 4550:
Geochemistry
Problem Set 1 Solution
Due Sept. 11, 2013
1.) Complete the proof that V is a state variable by showing that for an ideal gas:
V
V
=
P
T
(Hint: apply the reciprocity relation to the differential of V with respect to T
EAS 4550: Geochemistry
Prelim Examination
Oct. 19, 2011
Name _
Show all work for partial credit. The value of R is 8.314 J/mol-K.
1. Consider a solution of plagioclase (NaAlSi3O8CaAl2Si2O8). 15 points.
(a) Write a general expression for the chemical poten