Search Results - "Hacker, B. R."

The cold and relatively dry nature of mantle forearcs in subduction zones by Abers, G. A., van Keken, P. E., Hacker, B. R.

“…Dehydration of subducting slabs could create a reservoir of water in the overlying mantle. A synthesis of thermal model results, however, shows that slab…”
Get full text

Titanite petrochronology of the Pamir gneiss domes: Implications for middle to deep crust exhumation and titanite closure to Pb and Zr diffusion by Stearns, M. A., Hacker, B. R., Ratschbacher, L., Rutte, D., Kylander-Clark, A. R. C.

“…The Pamir Plateau, a result of the India‐Asia collision, contains extensive exposures of Cenozoic middle to lower crust in domes exhumed by north‐south crustal…”
Get full text

Timing of Syenite‐Charnockite Magmatism and Ruby and Sapphire Metamorphism in the Mogok Valley Region, Myanmar by Searle, M. P., Garber, J. M., Hacker, B. R., Htun, Kyi, Gardiner, N. J., Waters, D. J., Robb, L. J.

“…The Mogok metamorphic belt (MMB) extends for over 1,000 km along central Burma from the Andaman Sea to the East Himalayan syntaxis and represents exhumed lower…”
Get full text

Reconciling Geophysical and Petrological Estimates of the Thermal Structure of Southern Tibet by T. J. Craig, P. B. Kelemen, B. R. Hacker, A. Copley

“…Abstract The thermal structure of the Tibetan plateau—the largest orogenic system on Earth—remains largely unknown. Numerous avenues provide fragmentary…”
Get full text

Interpreting granulite facies events through rare earth element partitioning arrays by Taylor, R. J. M., Clark, C., Harley, S. L., Kylander‐Clark, A. R. C., Hacker, B. R., Kinny, P. D.

“…The use of rare earth element (REE) partition coefficients is an increasingly common tool in metamorphic studies, linking the growth or modification of…”
Get full text

Uncoupled U/Pb and REE response in zircon during the transformation of eclogite to mafic and intermediate granulite (Blanský les, Bohemian Massif) by Štípská, P., Powell, R., Hacker, B. R., Holder, R., Kylander-Clark, A. R. C.

“…ABSTRACT An eclogite–mafic granulite occurs as a rare boudin within a felsic kyanite–K‐feldspar granulite in a low‐strain zone. Its boundary is marked by…”
Get full text

New Age Constraints on the Metamorphic Evolution of the High‐Pressure/Low‐Temperature Belt in the Western Tianshan Mountains, NW China by Klemd, R., Bröcker, M., Hacker, B. R., Gao, J., Gans, P., Wemmer, K.

“…The western Tianshan high‐pressure/low‐temperature orogenic belt in NW China contains eclogite‐facies metavolcanic rocks and omphacite‐bearing blueschists…”
Get full text

40Ar/39Ar Constraints on the tectonic history and architecture of the ultrahigh-pressure Sulu orogen by HACKER, B. R., WALLIS, S. R., MCWILLIAMS, M. O., GANS, P. B.

“…New 40Ar/39Ar ages are presented from the giant Sulu ultrahigh‐pressure (UHP) terrane and surrounding areas. Combined with U‐Pb ages, Sm‐Nd ages, Rb‐Sr ages,…”
Get full text

Differences in water use efficiency among annual forages used by the dairy industry under optimum and deficit irrigation by Neal, J.S., Fulkerson, W.J., Hacker, R.B.

“…▶ Under optimal irrigation, there was a three-fold difference in mean annual WUE t between forages maize and cowpea. ▶ The ‘harvested’ forages maize, wheat,…”
Get full text

The fate of subducted continental margins: Two-stage exhumation of the high-pressure to ultrahigh-pressure Western Gneiss Region, Norway by Walsh, E. O., Hacker, B. R.

“…Thermobarometry suggests that ultrahigh‐pressure (UHP) to high‐pressure (HP) rocks across the Western Gneiss Region ponded at the Moho following as much as 100…”
Get full text

Partially melted, mica-bearing crust in Central Tibet by Hacker, B. R., Ritzwoller, M. H., Xie, J.

“…Surface wave tomography shows that the central Tibetan Plateau (the Qiangtang block) is characterized by S wave speeds as slow as 3.3 km/s at depths from 20–25…”
Get full text

Into the Forbidden Zone by Liou, J. G., Hacker, B. R., Zhang, R. Y.

“…It is an accepted tenet of geology that very low temperatures at high pressures constitute a "forbidden zone" never realized in Earth. Recent research on…”
Get full text

Rapid emplacement of the Oman ophiolite: Thermal and geochronologic constraints by Hacker, B. R., Mosenfelder, J. L., Gnos, E.

“…In understanding of ophiolite emplacement requires knowledge of the elapsed time between igneous crystallization and intraoceanic thrusting, and the rate and…”
Get full text

Thermochronology of the Talkeetna intraoceanic arc of Alaska: Ar/Ar, U-Th/He, Sm-Nd, and Lu-Hf dating by Hacker, B. R., Kelemen, Peter B., Rioux, Matthew, McWilliams, Michael O., Gans, Philip B., Reiners, Peter W., Layer, Paul W., Söderlund, Ulf, Vervoort, Jeffrey D.

“…As one of two well‐exposed intraoceanic arcs, the Talkeetna arc of Alaska affords an opportunity to understand processes deep within arcs. This study reports…”
Get full text

Zircon geochronology and ca. 400 Ma exhumation of Norwegian ultrahigh-pressure rocks: an ion microprobe and chemical abrasion study by Root, D.B., Hacker, B.R., Mattinson, J.M., Wooden, J.L.

“…Understanding the formation and exhumation of the remarkable ultrahigh-pressure (UHP) rocks of the Western Gneiss Region, Norway, hinges on precise…”
Get full text

Discrete ultrahigh-pressure domains in the Western Gneiss Region, Norway: implications for formation and exhumation by ROOT, D. B., HACKER, B. R., GANS, P. B., DUCEA, M. N., EIDE, E. A., MOSENFELDER, J. L.

“…New eclogite localities and new 40Ar/39Ar ages within the Western Gneiss Region of Norway define three discrete ultrahigh‐pressure (UHP) domains that are…”
Get full text

Thermal structure of the Costa Rica – Nicaragua subduction zone by Peacock, Simon M., Keken, Peter E. van, Holloway, Stephen D., Hacker, Bradley R., Abers, Geoffrey A., Fergason, Robin L.

“…We constructed four high-resolution, finite-element thermal models across the Nicaragua – Costa Rica subduction zone to predict the (i) thermal structure, (ii)…”
Get full text

Pressures and Temperatures of Ultrahigh-Pressure Metamorphism: Implications for UHP Tectonics and H2O in Subducting Slabs by Hacker, B. R.

“…Kyanite-phengite eclogites can yield robust P-T equilibration conditions that do not depend on the ferrous/ferric ratios of the constituent minerals. Even…”
Get full text

Diapiric exhumation of Earth's youngest (UHP) eclogites in the gneiss domes of the D'Entrecasteaux Islands, Papua New Guinea by Little, T.A., Hacker, B.R., Gordon, S.M., Baldwin, S.L., Fitzgerald, P.G., Ellis, S., Korchinski, M.

“…The Woodlark Rift in Papua New Guinea hosts the world's youngest (2–8 Ma) eclogite-facies rocks and extensional deformation has played a key role in exhuming…”
Get full text

Extracting thermal histories from the near-rim zoning in titanite using coupled U-Pb and trace-element depth profiles by single-shot laser-ablation split stream (SS-LASS) ICP-MS by Stearns, M.A., Cottle, J.M., Hacker, B.R., Kylander-Clark, A.R.C.

“…A method for depth profiling using single-shot laser-ablation split stream (SS-LASS) ICP-MS is developed to simultaneously measure U-Pb age and trace-element…”
Get full text