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GeologyScience Repository: Recent submissions
Now showing items 221-240 of 41505
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(2006)Primitive mammoth remains from the Pliocene and Lower Pleistocene of northern China are examined taxonomically and biostratigraphically. The taxonomy of the remains has been greatly confused in previous studies, but our ...
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(2006)The Adare Trough, located 100 km NE of Cape Adare, Antarctica, is the extinct third arm of a Tertiary spreading ridge that separated East from West Antarctica. We use seismic reflection data, tied to DSDP Site 274, to link ...
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(2006)Baltica is a progeny of Rodinia, born from the breakup of the supercontinent in the Neoproterozoic. Within Rodinia, Baltica is generally placed adjacent to NE Laurentia but in a variety of configurations, which vary by up ...
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(2006)During magma ascent in the volcanic conduit, the decompression of a silicic melt may result in the crystallization of morphologically and compositionally specific crystals, designated microlites. Hence, microlites have ...
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(2006)One of the more important questions in hydrology is: if the climate warms in the future, will there be an intensification of the water cycle and, if so, the nature of that intensification? There is considerable interest ...
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(2006)Mineral and melt inclusions in olivines from the most Mg-rich magma from the southern West Sulawesi Volcanic Province indicate that two distinct melts contributed to its petrogenesis. The contribution that dominates the ...
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(2006)In the Łomża region, northeastern Poland, many new lacustrine and peat deposits have been found. Pollen analysis of borehole material shows that they accumulated mostly during the Eemian Interglacial. Parts of these sites ...
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INFLUENCE OF EROSION AND SEDIMENTATION ON STRIKE-SLIP FAULT SYSTEMS: INSIGHTS FROM ANALOGUE MODELS (2006)We describe 18 experiments on the formation of strike-slip fault systems in sand. All models were in a rectangular box. A piston imparted strike-slip motion along a basal cut. In some experiments, uplifted areas underwent ...
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(2006)The predominantly constructive life cycles of large, long-lived, stratovolcanoes and basaltic shields are punctuated by transitory episodes during which large volumes of material are divested from the flanks. Such shedding ...
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(2006)A time-varying spherical harmonic model of the palaeomagnetic field for 0-7 ka is used to investigate large-scale global geomagnetic secular variation on centennial to millennial scales. We study dipole moment evolution ...
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(2006)Quaternary lavas from the NE Japan arc show geochemical evidence of mixing between mantle-derived basalts and crustal melts at the magmatic front, whereas significant crustal signals are not detected in the rear-arc lavas. ...
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(2006)Kimberlite volcanism involves the ascent of low viscosity (0.1 to 1 Pa s) and volatile-rich (CO2 and H2O) ultrabasic magmas from depths of 150 km or greater. Theoretical models and empirical evidence suggest ascent along ...
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(2006)The Brandberg West region of NW Namibia is dominated by poly-deformed turbidites and carbonate rocks of the Neoproterozoic Damara Supergoup, which have been regionally metamorphosed to greenschist facies and thermally ...
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(2006)Investigations into Permian sedimentation and reconstruction of paleogeography in SW China are aimed at characterizing sedimentary responses to the Emeishan mantle plume. In addition to erosional features on the sediments ...
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(2006)We are testing the idea of Squyres et al. (1992) that rampart craters on Mars may have formed over a significant time period and therefore the onset diameter (minimum diameter of a rampart crater) only reflects the ground ...
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NATURE OF THE MARTIAN UPLANDS: EFFECT ON MARTIAN METEORITE AGE DISTRIBUTION AND SECONDARY CRATERING (2006)Martian meteorites (MMs) have been launched from an estimated 5-9 sites on Mars within the last 20 Myr. Some 80-89% of these launch sites sampled igneous rock formations from only the last 29% of Martian time. We hypothesize ...
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(2006)Environmental conditions on Mars are conducive to the modification and erosion of impact craters, potentially revealing the nature of their substructure. On Earth, postimpact erosion of complex craters in a wide range of ...
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(2006)We employ P to S converted waveforms to investigate effects of the hot mantle plume on seismic discontinuities of the crust and upper mantle. We observe the Moho at depths between 13 and 17 km, regionally covered by a ...
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(2006)We present the results of a comprehensive major element, trace element and Sr-Nd-Pb-O isotopic study of post-glacial volcanic rocks from the Neovolcanic zones on Iceland. The rocks studied range in composition from picrites ...
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(2006)In low-seismicity regions, such as France or Germany, the estimation of probabilistic seismic hazard must cope with the difficult identification of active faults and with the low amount of seismic data available. Since the ...
Now showing items 221-240 of 41505