BH
Member Since 1983
Brad R. Hacker
Professor Emeritus, University of California Santa Barbara
AGU Research
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Average composition & genesis of the continental lower crust: Density sorting beneath arcs and continental collision zones
THE FATE OF THE LITHOSPHERE DURING CONTINENTAL COLLISION: SLAB DEFORMATION, LITHOSPHERIC REMOVAL, AND TECTONIC SEGMENTATION IN ACTIVE OROGENIC SYSTEMS III POSTER
tectonophysics | 14 december 2023
Peter B. Kelemen, Mark D. Behn, Bradley R. Hacker
We combine area- & volume-weighted average seismic wave speeds of lower continental crust (LCC) with thermodynamic calculations of mineral proport...
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Protracted Subduction of the European Hyperextended Margin Revealed by Rutile U‐Pb Geochronology Across the Dora‐Maira Massif (Western Alps)
TECTONICS
04 april 2022
Guillaume Bonnet, Christian Chopin, Michele Locate...
The Dora‐Maira massif is an archetypal nappe stack of subducted and exhumed upper crust. Slices of continental crust experienced metamorphism...
Assembly and Tectonic Evolution of Continental Lower Crust: Monazite Petrochronology of the Ivrea‐Verbano Zone (Val Strona di Omegna)
TECTONICS
16 march 2022
Damaris C. Wyatt, Andrew Smye, Joshua M. Garber, B...
Metasediments are common constituents of exhumed lower‐to‐mid‐crustal granulite terranes; understanding their emplacement is sign...
Relamination and Crustal Refining
NORMAN L. BOWEN AWARD LECTURE I
volcanology, geochemistry and petrology | 15 december 2021
Bradley R. Hacker
Most immature crust must be refined to attain the composition of mature continental crust. This refining may take the form of weathering, delamination...
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U–Pb Dates From Dynamically Recrystallized Titanite Directly Constrain Timing of Crystal-Plastic Deformation
ADVANCES AND APPLICATIONS OF IN SITU PETROCHRONOLOGY AND THERMOCHRONOLOGY I ORAL
volcanology, geochemistry and petrology | 14 december 2021
Amy C. Moser, Bradley R. Hacker, Tarryn K. Cawood,...
Directly dating high-temperature deformation is important for constraining the timing and duration of numerous geologic processes, yet a widely applic...
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Dating Continental Subduction Beneath the Samail Ophiolite: Garnet, Zircon, and Rutile Petrochronology of the As Sifah Eclogites, NE Oman
JOURNAL OF GEOPHYSICAL RESEARCH: SOLID EARTH
04 december 2021
Joshua M. Garber, Matthew E. Rioux, Michael P. Sea...
Studies of the high‐pressure (HP) As Sifah eclogites in the NE Saih Hatat Window, Oman, have used different combinations of radiometric datin...
Petrochronology of Wadi Tayin Metamorphic Sole Metasediment, With Implications for the Thermal and Tectonic Evolution of the Samail Ophiolite (Oman/UAE)
TECTONICS
04 december 2020
Joshua M. Garber, Matthew E. Rioux, Andrew R. Kyla...
Ophiolite metamorphic soles preserve important records of ophiolite emplacement, but there have been few detailed investigations into their nonR...
Reconciling Geophysical and Petrological Estimates of the Thermal Structure of Southern Tibet
GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS
11 august 2020
Timothy J. Craig, Peter B. Kelemen, Bradley R. Hac...
The thermal structure of the Tibetan plateau—the largest orogenic system on Earth—remains largely unknown. Numerous avenues provide fra...