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Abstract/Syllabus:
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Van Der Hilst, Robert, 12.570 Seminar in Geophysics: Thermal and Chemical Evolution of the Earth, Spring 2005. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 09 Jul, 2010). License: Creative Commons BY-NC-SA

A visualization of mantle convection. (Courtesy of NASA-JPL.)
Course Highlights
This seminar course features lecture summaries and reading lists from MIT and Harvard guest lecturers.
Course Description
The main objective of this cross-disciplinary course is to understand the historical development and the current status of ideas and models, to present and question the constraints from the different research fields, and to investigate if and how the different views on mantle flow can be reconciled with the currently available data.
Syllabus
Overview
These are exciting times for studies of the structure, composition, and evolution of Earth's deep interior. Seismic imaging, geodynamical modeling, and noble gas analyses have provided spectacular new insight in the nature and scale of mantle convection. But despite the increased understanding and consensus within research groups there are significant outstanding issues, whose resolution requires cross-disciplinary study.
Objectives
The main objective of this cross-disciplinary course is to understand the historical development and the current status of ideas and models, to present and question the constraints from the different research fields, and to investigate if and how the different views on mantle flow can be reconciled with the currently available data.
Format
Each week faculty members will lecture on the basic physics and chemistry pertinent to the topic of that particular week. These lectures will be followed by literature discussions under leadership of (groups of) students. In this way we aim to cover the basic science as well as digest a substantial fraction of the pertinent literature; the group structure stimulates student interaction and helps reducing communication problems that often complicate cross-disciplinary discussion.
Students work together in small (less than 4 students) cross-disciplinary, cross-institutional teams in order to improve the understanding and communication of multidisciplinary topics. The groups participate in the following activities:
- Every week, one group is responsible for summarizing the faculty/staff lecture and the related discussions and for preparing material that can be posted on-line;
- Every week, two (other) groups have a reading assignment (one or more papers, depending on length and difficulty) on the topic of the faculty/staff lecture. The students read and discuss the material; the student closest to the topic at hand (e.g., geochemistry) often has to educate his/her fellow students (who may be more familar with concepts of, say, seismology, mineral physics, or geodynamics) - and they present a 15 min summary to the rest of the class.
- There is a mid-term assignment for the groups, which consists of summarizing the issues discussed during the first half of the semester and of working on a small research problem.
- The final assignment takes the form of writing a "research proposal"; for this the students taking the class for credit need to reflect on the class, identify which problems are still open, and propose a research project that would address one or more of them.
Prerequisites
None.
Grading
Grades will depend on quality of the mid-term and final assignments, the group presentations, the lecture notes, and general participation in the discussions, and they are determined in a final meeting of all staff responsible for the class.
Calendar
Lecturers for this Course
Harvard: Richard O'Connell, Jeremy Bloxham, Stein Jacobsen, Sujoy Mukhopadhyay
MIT: Robert Van Der Hilst, Bradford Hager, Timothy Grove, Sang-heon Shim
Course schedule
Lec # |
Topics |
LECTURERs |
Key dates |
1 |
Geodynamics: Introduction - Parameterized Convection |
Richard O'Connell |
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2 |
Geochemistry: Composition of the Earth
Heat Producing Elements
Isotopic Evolution |
Stein Jacobsen |
Presentation and discussion by group 1
Presentation and discussion by group 2 |
3 |
Core Energetics: Geodynamo Constraints on Heat Generation and Transport |
Jeremy Bloxham |
Presentation and discussion by group 3
Presentation and discussion by group 4 |
4 |
Mineral Physics: Phase Transitions and Implications for Mantle Dynamics |
Dan Shim |
Presentation and discussion by group 1 |
5 |
Mantle Petrology: Chemical and Petrological Constraints of Mantle Evolution (Accretion Models; Early Earth Conditions; Magma Ocean; Implications for Other Planets) |
Tim Grove |
Presentation and discussion by group 3
Presentation and discussion by group 4 |
6 |
Noble Gas Constraints on Mantle Structure |
Sujoy Mukhopadhyay |
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7 |
Constraints on Mantle Structure and Composition from Seismic Tomography (Part 1) |
Rob Van Der Hilst |
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8 |
Constraints on Mantle Structure and Composition from Seismic Tomography (Part 2) |
Rob Van Der Hilst |
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9 |
Simple Fluid Dynamical Constraints on Mixing, and Unmixing |
Brad Hager |
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10 |
Mantle Geochemistry and Heterogeneity |
Richard O'Connell |
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11 |
Lower Most Mantle and D'' (Heat Flow, Thermal Boundary Layers, Post-Perovskite, ...) |
Helge Gonnermann / Rob Van Der Hilst |
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12 |
As a 'Grand Finale' all students taking the class for credit will present a short paper |
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Further Reading:
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Readings
Calendar schedule
Lec # |
Topics |
LECTURERS |
readings |
1 |
Geodynamics: Introduction - Parameterized Convection |
Richard O'Connell |
The following papers will be discussed in Lecture 2
(N. B. Everyone should read the papers, but groups will present the material and lead the discussion)
Group 1
McNamara, and Van Keken. "Cooling of the Earth: a parameterized convection study of whole versus layered models." G-cubed (2000).
Group 2
Davies. "Thermal histories of convective Earth models and constraints on radiogenic heat production in the Earth." JGR (1980).
General Discussion
Hofmeister, and Chriss. "Earth's heat flux revised and linked to chemistry." Tectonophysics (2005). |
2 |
Geochemistry: Composition of the Earth
Heat Producing Elements
Isotopic Evolution |
Stein Jacobsen |
General Reading
Ringwood, A. E. Origin of the Earth and Moon. New York, NY: Springer-Verlag, 1979, chapters 1, 2, 3, and 4. ISBN: 0387903690.
Related Reading Assignments
The following papers will be presented/discussed in Lecture 3
(N.B. Everyone should read the papers, but groups will present the material and lead the discussion)
Group 3
Allegre, C., et al. "Chemical composition of the Earth and volatility control on planetary genetics." EPSL (2001).
Optional: Patchett, P. J., et al. "Lu-HF and Sm-Nd isotopic systematics in chondrites and their constraints on the Lu-Hf properties of the Earth." EPSL (2004).
Group 4
Walker, R. J., et al. "Low abundances of highly siderophile elements in the lunar mantle: evidence for prolonged late accretion." EPSL (2004).
Optional: Brandon, A. D., et al. "186Os-187Os systematics of Gorgona island komatiites: implications for early growth of the inner core." EPSL (2003). |
3 |
Core Energetics: Geodynamo Constraints on Heat Generation and Transport |
Jeremy Bloxham |
The following papers will be presented/discussed in Lecture 4
Group 1
Nimmo, F. "Why does Venus lack a magnetic field?" Geology 30 (2002): 987-990.
Group 2
Christensen, U., and A. Tilgner. "Power requirements of the geodynamo from Ohmic losses in numerical and laboratory dynamos." Nature 429 (2004): 169-171. (along with "News & Views" by Holme in same issue) |
4 |
Mineral Physics: Phase Transitions and Implications for Mantle Dynamics |
Dan Shim |
The following papers will be presented/discussed in Lecture 5
Group 3
Smyth, J. R., and D. J. Frost. "The effect of water on the 410-km discontinuity - An experimental study." Geophysical Research Letters 29, no. 10 (2002).
Group 4
Weidner, D. J., and Y. Wang. "Chemical- and Clapeyron-induced buoyancy at the 660 km discontinuity." Journal of Geophysical Research 103 (1998): 7431-7441. |
5 |
Mantle Petrology: Chemical and Petrological Constraints of Mantle Evolution (Accretion Models; Early Earth Conditions; Magma Ocean; Implications for Other Planets) |
Tim Grove |
The following papers will be presented/discussed in Lecture 6
Group 1
Grove, T. L., and S. W. Parman. "Thermal evolution of the Earth as recorded by komatiites." Earth and Planetary Science Letters (2004).
Group 2
Davies, G. F. EPSL 136 (1995): 363-379. |
6 |
Noble Gas Constraints on Mantle Structure |
Sujoy Mukhopadhyay |
The following papers will be presented/discussed in Lecture 7
Group 3
Ballentine, C., et al. "Numerical models, geochemistry, and the zero-paradox noble-gas mantle." Phil Trans R Soc Lond Ser A (2002).
Group 4
Yamamoto, J., and P. G. Burnard. "Solubility controlled noble gas fractionation during magmatic degassing: implications for noble gas compositions of primary melts of OIB and MORB." Geochimica and Cosmochimica Acta (2005). |
7 |
Constraints on Mantle Structure and Composition from Seismic Tomography (Part 1) |
Rob Van Der Hilst |
The following papers will be presented/discussed in Lecture 8
Group 1
Ritsema, J., and R. Allen. "The elusive mantle plume." Earth Planet Sci Lett (2003).
Group 2
Montelli R., G. Nolet, F. A. Dahlen, G. Masters, E. R. Engdahl, and S. H. Hung. "Finite-frequency tomography reveals a variety of plumes in the mantle." Science 303 (2004): 338-343.
Backround Reading
Montelli R., G. Nolet, G. Masters, F. A. Dahlen, and S. H. Hung. "Global P and PP traveltime tomography: rays versus waves." Geophys J Int 158 (2004): 637-654. |
8 |
Constraints on Mantle Structure and Composition from Seismic Tomography (Part 2) |
Rob Van Der Hilst |
The following papers will be presented/discussed in Lecture 9
Group 3
Kellogg, L., B. H. Hager, and R. D. Van Der Hilst. "Compositional stratification in the deep mantle." Science 283 (1999): 1881-1884.
Group 4
Trampert, J., F. Deschamps, J. Resovsky, and D. Yuen. "Probabilistic tomography maps chemical heterogeneities throughout the lower mantle." Science 306 (2004): 853-856.
And the related "Perspective":
Van Der Hilst, R. D. "Changing views on Earth's deep mantle." Science 306, Part 2 (2004): 817-818. |
9 |
Simple Fluid Dynamical Constraints on Mixing, and Unmixing |
Brad Hager |
The following papers will be presented/discussed in Lecture 10
Group 2
Becker, T. W., J. B. Kellogg, and R. J. O'Connell. "Thermal constraints on the survival of primitive blobs in the lower mantle." EPSL 171 (1999): 351-365.
Group 1
Hager, B. H., et al. "Lower mantle heterogeneity, dynamic topography, and the geoid." Nature 313 (1985): 541-545. |
10 |
Mantle Geochemistry and Heterogeneity |
Richard O'Connell |
The following papers will be presented/discussed in Lecture 11
Group 3
Xie, S., and P. J. Tackley. "Evolution of helium and argon isotopes in a convecting mantle." PEPI 146 (2004): 417-439.
Group 4
———. "Evolution of U-Pb and Sm-Nd systems in numerical models of mantle convection." Journal of Geophysical Research 109 (2004). |
11 |
Lower Most Mantle and D'' (Heat Flow, Thermal Boundary Layers, Post-Perovskite,...) |
Helge Gonnermann / Rob Van Der Hilst |
Lecture 12 is the last meeting of this class. As a 'Grand Finale' all students taking the class for credit will present one of the following papers.
Hernlund, J. W., C. Thomas, and P. J. Tackley. "A doubling of the post-perovskite phase boundary and structure of the Earth's lowermost mantle." Nature 434, no. 7035 (April 14, 2005): 882-886.
Jellinek, A. M., and M. Manga. "The influence of a chemical boundary layer on the fixity, spacing and lifetime of mantle plumes." Nature 418, no. 6899 (August 15, 2002): 760-763.
Davaille, A. "Simultaneous generation of hotspots and superswells by convection in a heterogenous planetary mantle." Nature 402, no. 6763 (December 16, 1999): 756-760.
Sidorin, I., M. Gurnis, and D. V. Helmberger. "Evidence for a ubiquitous seismic discontinuity at the base of the mantle." Science 286, no. 5443 (November 12, 1999): 1326-1331.
Dobson, D. P., and J. P. Brodholt. "Subducted banded iron formations as a source of ultralow-velocity zones at the core-mantle boundary." Nature 434, no. 7031 (March 17, 2005): 371-374.
Lay, T., Q. Williams, and E. J. Garnero. "The core-mantle boundary layer and deep Earth dynamics." Nature 392, no. 6675 (April 2, 1998): 461-468.
Buffett, B. A. "Estimates of heat flow in the deep mantle based on the power requirements for the geodynamo." Geophysical Research Letters 29, no. 12, Art. No. 1566 (June 15, 2002).
Badro, J., J. P. Rueff, G. Vanko, et al. "Electronic transitions in perovskite: Possible nonconvecting layers in the lower mantle." Science 305, no. 5682 (July 16, 2004): 383-386. |
12 |
As a 'Grand Finale' all students taking the class for credit will present a short paper |
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