ESCI-430

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ESCI-430 Trace-element and isotope
geochemistry Cin-Ty Lee Gerald Dickens TA
Zhengxue Li
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Grading scheme 50 Homework, quizzes, and class
participation 25 Term Paper 25 Oral
presentation of term paper Texts Faure, Isotope
Principles and applications, 3rd
edition Albarede, Geochemistry an
Introduction Lee, Lecture notes
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Guidelines Homework must be turned in on
time -25 for late homeworks -100 for
homeworks later than 1.5 weeks, i.e. dont
bother Participation will involve reading an
assigned paper Each student is responsible for
one paper and presenting a 10 minute, concise
summary and critique you will be quizzed on the
paper so everyone must read the paper Term
paper 10 page report on a current topic of your
interest Oral presentation Term paper will be
followed by a 15 minute oral presentation at the
end of the semester
NO BULLSHIT
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VENUS
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What is unique about the Earth?
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Atmosphere
Ocean
Continental Crust
Mid- ocean Ridge
Base of lithosphere
Plume
Oceanic Crust
Mantle
Core
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Not to scale
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Aerosol Deposition
Evaporation
Rivers
Groundwater
Adsorption Precipitation
Hydro- thermal Inputs Outputs
Biological Processes
Dissolution
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We will investigate how various reservoirs
interact
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We will begin with the origin of the solar
system.
Andromeda Galaxy
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Orion Nebulae
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The Sun
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Trace elements and isotopes as tracers of how
Earth was formed and differentiated Evolution of
Earth
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The building blocks of our planet
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Major Elements gt1 wt. Minor Elements 0.1 to 1
wt. Trace Elements 100 ppm or less
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BULK EARTH
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Bulk Silicate Earth
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MgO (wt. )
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MOR basalt
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Average Lower Crust
Andesite
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Dacite
Average Continental Crust
Rhyolite
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0
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60
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SiO2 (wt. )
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Conc Crust
Conc. / Primitive Mantle
N-MORB
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ATOMIC STRUCTURE NUCLEUS PROTONS AND
NEUTRONS ELECTRON SHELLS ATOMIC NUMBER
Z NEUTRON NUMBER N ATOMIC MASS NUMBER Z
N ELEMENTAL IDENTITY DETERMINED BY Z NEUTRON
NUMBER CAN VARY (ISOTOPES)
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NUCLIDE CHART
Valley of stability
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RADIOACTIVE DECAY SCHEMES
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Our goal is to look at how the Earth
differentiates into its different
reservoirs Trace elements can be used to track
the process of differentiation Radiogenic
isotopes can be used to put constraints on the
rates and timing of differentiation processes