Jessica D'Andrea

UCLA Department of Earth and Space Sciences

595 Charles E. Young Drive

Geology 3652, Los Angeles, Ca 90095

(310) 206-2940                                        

I am currently working on my Ph.D., in the UCLA Department of Earth and Space Sciences, with Dr. T. Mark Harrison on the crustal evolution of the Tibetan plateau.  My research includes using field mapping, geochemistry, and geochronology as tools for understanding the history of the South Tibetan crust.  Primarily, I have focused on granitoids exposed in the footwall of a large detachment system, the Nyainqentanglha Shear Zone, located in southeastern Tibet.  I collect numerous rock samples and separate out the accessory minerals zircon and monazite in order to conduct geochronological studies. By doing U-Pb and Th-Pb dating of individual zircon and monazite grains using the Cameca 1270 Ion microprobe we can constrain the timing of magmatism in southern Tibet.  We also study the thermal histories of these crustal rocks using K-Ar, Ar-Ar, and U-Th-He thermochronological techniques.  By studying both the thermal and chemical nature of these south Tibetan granitoids, we hope to gain an understanding of how (and when) the plateau formed, and what has been happening geologically and tectonically since the initial collision of India with Asia at ~65 Ma! 

Field photos

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Publications:

D'Andrea, Jessica L., C.F. Miller, and J.C. Ayers, 1997, Peraluminous Plutonism in the Colorado River Extensional Corridor, Southern NV: An Unusual Cretaceous, not Miocene, Intrusive Episode. GSA annual meeting abstracts.

Miller, C.F., D'Andrea, J.L., Ayers, J.C., Coath, C.D., and Harrison, T.M., 1997, BSE imaging and ion probe geochronology of zircon and monazite from plutons of the Eldorado and Newberry Mountains, Nevada: Age, inheritance, and subsolidus modification: Eos 78: F783.

D'Andrea, Jessica, 1998, Geology and Petrogenesis of the Ireteba Pluton: Implications for the Generation of Peraluminous Granites.  Masters Thesis, Vanderbilt University.

Townsend, K.J., Miller, C.F., D'Andrea, J.L., Ayers, J.C., Harrison, T.M., and Coath, C.D., 1998, Monazite replacement during modification of the Ireteba granite, southern Nevada: Geochronological implications: Geol. Soc. America, abst. with prog. 30(7): A214.

D'Andrea, Jessica, T. M. Harrison, M. Grove, and Zhou Xinhua, 1999, The Thermal and Physical State of the South Tibetan Middle Crust Between 20-8 Ma: U-Th-Pb and Nd Isotopic Evidence from the Nyainqentanglha Massif.   14th annual Himalaya-Karakorum-Tibet Workshop Abstracts volume, Kloster-Ettal, Germany.

D'Andrea, Jessica, T.M. Harrison, and M. Grove, 1999, The Post-Collisional Thermal and Compositional Structure of the Gangdese Arc, Nyainqentanglha, Southern Tibet.  AGU fall meeting, EOS, Transactions, AGU volume 80, 46, F991.

D'Andrea, J.L., Miller, C.F., Miller, J.S. and Coath, C.D., 1999, Ireteba pluton, Eldorado Mountains, Nevada: Evidence for late, deep source, peraluminous magmatism in the Cordilleran Interior: Geol. Soc. America, abst. with prog. 31(6): A48.

Townsend, K.J., Miller, C.F., Ayers, J.C., D'Andrea, J.L., Harrison, T.M., and Coath, C.D., 1999, Paragenesis of monazite in the Ireteba granite: Zoning and geochronological evidence for multiple generations of fluid-induced replacement: Eos, v. 80(17), p. S356.

Harrison, T.M., M. Grove, O.M. Lovera, E.J. Catlos, and J. D'Andrea, 1999, The origin of Himalayan anatexis and inverted metamorphism: Models and constraints: Journal of Asian Earth Sciences, 17, 755-772

Townsend, K.T., C.F. Miller, J.L. D'Andrea, J.C. Ayers, T.M. Harrison, and C.D. Coath, 2000, Low temperature replacement of monazite in the Ireteba granite, southern Nevada: Geochronological implications: Chemical Geology (in press).


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Contact me at jessica@argon.ess.ucla.edu