Zircon and rutile are common accessory minerals whose essential structural constituents, Zr, Ti, and Si can replace one another to a limited extent. Here we present the combined results of high pressure-temperature experiments and analyses of…
Petrology
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Compositional models of the Earth are critically dependent on three main sources of information: the seismic profile of the Earth and its interpretation, comparisons between primitive meteorites and the solar nebula composition, and chemical and…
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Abstract The thermodynamic properties of 254 end-members, including 210 mineral end-members, 18 silicate liquid end-members and 26 aqueous fluid species are presented in a revised and updated internally consistent thermodynamic data set. The PVT…
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Subduction zones are where sediments, oceanic crust, and mantle lithosphere return to and reequilibrate with Earth's mantle. Subduction zones are interior expressions of Earth's 55,000 km of convergent plate margins and are the geodynamic system…
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Phase diagrams of hydrous mid-ocean ridge (MOR) basalts to 330 lan depth and of hydrous peridotites to 250 lan depth are compiled for conditions characteristic for subduction zones. A synthesis of our experimentally determined phase relations of…
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Titanium is one of many trace elements to substitute for silicon in the mineral quartz. Here, we describe the temperature dependence of that substitution, in the form of a new geothermometer. To calibrate the TitaniQ thermometer, we synthesized…
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Study of metamorphic suites directly representing the deep subduction of altered oceanic crust and sediments can help elucidate the geochemical evolution of the forearc-to-subarc slab-mantle interface, the nature of slab-derived fluids added to arc…
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Isotopic fingerprinting has long been used to trace magmatic processes and the components that contribute to magmas. Recent technological improvements enable us to measure the isotopic composition of progressively smaller samples. This has provided…
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Metasedimentary rocks generally contain carbonaceous material (CM) deriving from the evolution of organic matter originally present in the host sedimentary rock. During metamorphic processes, this organic matter is progressively transformed into…
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Monazite is a light rare earth element (LREE)-bearing phosphate mineral that is present in a wide variety of rock types, has an ex- tremely variable composition reflecting host rock conditions, and is a robust geochronometer that can preserve…
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Useful U-Pb isotopic data may be obtained from sphene (or titanite, CaTiSiO5) because: (1) it is a widespread accessory mineral, (2) it can incorporate uranium in its structure, and (3) it has a high closure temperature. In igneous rocks, sphene is…
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Lawsonite eclogites preserve a record of very-low-temperature conditions in subduction zones. All occur at active margin settings, typically characterized by accretionary complexes lithologies and as tectonic blocks within serpentinite-matrix…
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Biogenic calcium carbonate forms the inorganic component of seashells, otoliths, and many marine skeletons, and its formation is directed by an ordered template of macromolecules. Classical nucleation theory considers crystal formation to occur from…
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The origin of mantle hotspots is a controversial topic. Only seven (primary) out of 49 hotspots meet criteria aimed at detecting a very deep origin (three in the Pacific, four in the Indo-Atlantic hemisphere). In each hemisphere these move slowly,…
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We derive an estimate for the chemical composition of the depleted MORB mantle (DMM), the source reservoir to mid-ocean ridge basalts (MORBs), which represents at least 30% the mass of the whole silicate Earth. A database for the chemical and…
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The amount of time a bird allocates to incubation is likely to be limited by energetic constraints. If food is abundant, energetic constraints may be reduced and the time spent incubating (incubation attendance) may increase. Moreover, the onset of…
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Ancient zircons from Western Australia's Jack Hills preserve a record of conditions that prevailed on Earth not long after its formation. Widely considered to have been a uniquely violent period geodynamically, the Hadean Eon 4.5 to 4.0 billion…
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More and more evidence is being discovered in Phanerozoic collision belts of the burial of crustal rocks to previously unsuspected (and ever increasing) depths, presently on the order of 150-200 km, and of exhumation from such depths. This extends…
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The Eastern Mediterranean region exhibits a fascinating diversity of ophiolites and related oceanic magmatic units of mainly Triassic, Jurassic and Cretaceous age. Comparisons with the settings of modern oceanic lithosphere indicate that the various…
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Granitoids are divided into several types according to their mineral assemblages, their field and petrographical features, and their chemical and isotopic characteristics. This typology complements most of the recent classifications because it is…
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Post DocDept. of Geological Sciences, University of Colorado, Boulder -
Assistant ProfessorDepartment of Geology, University of Kansas -
ProfessorNúcleo de Geologia/Universidade Federal de Sergipe -
Student (Bachelor)Semarang, Indonesia -
Researcher (at an Academic Institution)Department of Earth and Planetary Science, University of California, Berkeley