Browsing Geology by Title
Now showing items 86-105 of 172
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Jurassic Pork: What Could a Jewish Time Traveler Eat?
(Springer Nature, 2015-09-24)Paleontologists use multiple methods to reconstruct the anatomy and behavior of extinct animals, including direct observations from well-preserved fossils and inferences from the phylogeny of modern and extinct relatives. ... -
Kinematics and Deformation History of the Cross Lake Greenstone Belt
(2004-12-17)Greenstone belts are a common feature of Archean terrains. However, the tectonic environment for Archean earth remains in hot debate: did vertical or horizontal crustal movement dominate the Archean Eon? Small-scale ... -
The Kinetics and Mechanism of Sedimentary Iron Sulfide Formation
(1976)The reaction between goethite, ∝-FeOOH, and aqueous bisulfide ion, HS, was studied under conditions representative of estuarine sediments. The concentration-time curves of the following species were determined by ... -
LiDAR and Magnetic Data for: Field Mapping and Modeling of Terrestrial Lava Tube Magnetic Anomalies as an Analog for Lunar Lava Tube Exploration and Prospecting
(2022)Archived are Magnetic and LiDAR data collected at Lava Beds National Monument by the NASA funded TUBEX project (Dr. Kelsey Young – PI) in 2017 and 2018. The archived data are for a paper submitted to a JGR Planets special ... -
Lithium and delta7Li behavior during metamorphic dehydration processes and crustal evolution
(2011)Li isotopes have been used as a tracer of a wide range of geological processes, because the two stable isotopes of Li have significant relative mass difference and large elemental dispersion in Earth. In order to understand ... -
Lithium and its isotopes as a tracer of fluid flow mechanisms in the Catalina Schist melange zone
(2014)Mélange zones are areas of highly mixed and deformed rock believed to form from shearing between subducting slab and peridotite mantle wedge. They have high -pressure/low-temperature mineral assemblages and contain a ... -
LITHIUM ISOTOPIC SYSTEMATICS OF THE CONTINENTAL CRUST
(2005-12-05)In order to fully utilize Li isotopes as a geochemical tracer, it is necessary to characterize the Li isotopic compositions of different geological reservoirs, and quantify the magnitude of isotopic fractionations for ... -
Lithospheric Extension on Venus: how to form narrow rifts
(2017)The Venusian rifts of Devana and Ganis Chasmata have been noted for their similar morphology to some rifts on Earth (i.e., the East African rift system). These are narrow rifts that are associated with localized deformation. ... -
Lower rotational inertia and larger leg muscles indicate more rapid turns in tyrannosaurids than in other large theropods
(2019-02-21)Synopsis Tyrannosaurid dinosaurs had large preserved leg muscle attachments and low rotational inertia relative to their body mass, indicating that they could turn more quickly than other large theropods. Methods To ... -
Melt extraction and crustal thickness variations at segmented mid-ocean ridges
(2017)Mid-ocean ridges are underwater volcanic mountains extending more than 55,000 km in ocean basins worldwide, accounting for nearly 80% of the Earth’s volcanism. They are the birthplace of new seafloor, resurfacing two thirds ... -
Melting and Phase Relations in Iron-Silicon Alloys with Applications to the Earth's Core
(2009)Experiments were performed on iron-silicon alloys to determine their suitability as analog compositions for the Earth's core. Starting compositions with 9 wt.% silicon and 16 wt.% silicon were compressed in diamond anvil ... -
Metals in Arc Magmas: The Role of Cu-Rich Sulfide Phases
(2011)Based on experiments performed on hydrous andesitic melts at 1000°C, 150 MPa, <italic>f</italic>O<subscript>2</subscript> from the Co-CoO to Ni-NiO buffer, and log <italic>f</italic>S<subscript>2</subscript> equal to -0.5 ... -
Meter Scale Heterogeneities in the Oceanic Mantle Revealed in Ophiolite Peridotites
(2017)The upper oceanic mantle is the largest accessible terrestrial geochemical reservoir. Numerous aspects of the upper oceanic mantle’s current state, as well as its chemical evolution through time, remain obscure. Although ... -
Meter-Scale Chemical and Isotopic Heterogeneities in the Oceanic Mantle, Leka Ophiolite Complex, Norway
(Oxford, 2021-07-13)Mantle peridotites from three 3 x 3-meter grids sampled at kilometer distances from one another in the ca. 497 Ma Leka Ophiolite Complex (LOC), Norway, are examined to investigate the chemical and isotopic nature of oceanic ... -
A mélange of subduction ages: Constraints on the timescale of shear zone development and underplating at the subduction interface, Catalina Schist (CA, USA)
(2021)The presence of mélange at the subduction interface influences numerous geochemical and geophysical processes. However, the relationship between the timescales of mélange development, deformation, and resultant mass transport ... -
The Micron Scale Pb Isotopic Systematics of the Lower Continental Crust
(2011)The thermochronology, genetic relationships, and U-Th-Pb history of the deep crust in the North China Craton, the Tanzanian Craton, and the Mozambique Belt have been interrogated using the Pb isotopic system in feldspars ... -
MOLYBDENUM ISOTOPE SYSTEMATICS IN NATURAL AND EXPERIMENTAL SETTINGS
(2010)Molybdenum isotopes have a broad potential applicability for paleoenvironmental analysis, particularly with respect to questions of eutrophication history, development of anoxia, and sedimentation under conditions of ... -
Multiple sulfur isotope fractionations in inorganic aqueous systems
(2016)New constraints on isotope fractionation factors in inorganic aqueous sulfur systems based on theoretical and experimental techniques relevant to studies of the sulfur cycle in modern environments and the geologic rock ... -
The Multiple Sulfur Isotopic Composition of Iron Meteorites: Implications for Nebular Evolution
(2013)Multiple sulfur isotopic measurements of troilite from 61 different iron meteorites were undertaken in order to test for sulfur isotopic homogeneity within (and between) 8 different iron meteorite groups. It was found that ... -
Multiple sulfur isotopic composition of main group pallasites support genetic links to IIIAB iron meteorites (Data set)
(Geochimica et Cosmochimica Acta, 2018-01-31)