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Full-Text Articles in Physical Sciences and Mathematics
Deglacial Chronology Of The Northern Scott Coast From Relative Sea-Level Curves, Brenda Hall
Deglacial Chronology Of The Northern Scott Coast From Relative Sea-Level Curves, Brenda Hall
University of Maine Office of Research Administration: Grant Reports
This award provides support for three years for a project to develop a radiocarbon chronology for recession of grounded ice from the northwestern Ross Sea Embayment (northern Scott Coast) since the Last Glacial Maximum (LGM). A key unresolved question in Antarctic glaciology concerns the stability of the marine-based West Antarctic ice sheet (WAIS). One way to gain insight into present and future stability is to examine its past behavior. In particular, the timing of deglaciation from the LGM position on the continental shelf is critical for isolating the mechanisms (sea level, climate, ocean temperature, and internal dynamics) that control WAIS …
Beryllium In Antarctic Ultrahigh-Temperature Granulite-Facies Rocks And Its Role In Partial Melting Of The Lower Continental Crust, Edward S. Grew
Beryllium In Antarctic Ultrahigh-Temperature Granulite-Facies Rocks And Its Role In Partial Melting Of The Lower Continental Crust, Edward S. Grew
University of Maine Office of Research Administration: Grant Reports
This award, provided by the Antarctic Geology and Geophysics Program of the Office of Polar Programs, supports a project to investigate the role of beryllium in lower crustal partial melting events. The formation of granitic liquids by partial melting deep in the Earth's crust is one of the major topics of research in igneous and metamorphic petrology today. One aspect of this sphere of research is the beginning of the process, specifically, the geochemical interaction between melts and source rocks before the melt has left the source area. One example of anatexis in metamorphic rocks affected by conditions found deep …
Collaborative Research: Locating The Mantle Component In Granite, Daniel R. Lux, John P. Hogan, David Gibson
Collaborative Research: Locating The Mantle Component In Granite, Daniel R. Lux, John P. Hogan, David Gibson
University of Maine Office of Research Administration: Grant Reports
Granitic plutons of the Coastal Maine Magmatic Province (CMMP) commonly display dramatic field relations that record interaction between magmas of markedly different composition (chemical and isotopic) and physical properties. Silicic magma chambers, derived from the crust, received influxes of denser mafic magma that spread out along the floor of these chambers to produce a compositional stratification know as Mafic and Silicic Layered Intrusions (MASLI). The spectacular field relations and large compositional variation in the vicinity of the interface between contrasting magma types are well document by recent studies. In contrast, the extent of physical and chemical coupling between the base …
Collaborative Research: Southern Andes Paleoclimate; A Testof Abrupt Ocean-Atmosphere Reorganizations In Glacial Cycle, George Denton
Collaborative Research: Southern Andes Paleoclimate; A Testof Abrupt Ocean-Atmosphere Reorganizations In Glacial Cycle, George Denton
University of Maine Office of Research Administration: Grant Reports
In the late 1980s, Broecker and Denton prepared papers on the concept that glacial-to-interglacial transitions involved global reorganizations of the ocean-atmosphere system (Broecker, W. S. and Denton, G. H., 1989. The role of ocean-atmosphere reorganizations in glacial cycles. Geochimica et Cosmochimica Acta, 53, 2465-2501; Broecker, W. S. and Denton, G. H., 1990, What drives glacial cycles? Sci. American, 262, 49-56). These reorganizations were thought to constitute jumps of Earth's climate systems between stable modes of operation, and they featured changes in the greenhouse-gas content or reflectivity of the atmosphere. In that concept, switches in thermohaline circulation, resulting from changes in …
Magmatic To Solid-State Fabric Transition In A Post-Tectonic Tonalite Pluton, Scott E. Johnson
Magmatic To Solid-State Fabric Transition In A Post-Tectonic Tonalite Pluton, Scott E. Johnson
University of Maine Office of Research Administration: Grant Reports
Magma chambers are an essential component in the construction of oceanic and continental lithosphere, and profoundly influence the thermal and mechanical behavior of the crust and mantle. The mechanical properties of a magma chamber change during cooling and crystallization, as accommodation of deformation changes from magmatic flow to solid-state processes. Thus, to understand the thermo-mechanical evolution of magma chambers, it is crucial to understand the relative importance of magmatic and solid-state flow, and the nature of the transition between them. This project is investigating such a transition preserved in the San Jose pluton, Baja California, Mexico. The pluton postdates the …