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Now showing items 16325-16344 of 39126
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(2002)We present major and trace-element, oxygen isotope, textural, and structural data for carbonates and related phases in the SNC meteorite ALH84001. These data document the existence of at least two distinct carbonate ...
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(2001)The present paper describes two compound chondrules labelled panda and chevron, discovered in the Baszkówka meteorite. Optical microscope, electron microscope and electron microprobe studies revealed an unusual mineral ...
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(2003)The abundance and morphology of microdiamond in dolomite marble from Kumdy-kol in the Kokchetav Massif, are unusual; a previous study estimated the maximum content of diamonds in dolomite marble to be about 2700 carat ...
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(1997)A combined solution for the two major terrestrial lead paradoxes has been sought. These are the ‘future’ paradox (upper crustal and upper mantle Pb isotope compositions plot in the future field in 207Pb/204Pb vs. 206Pb/204Pb ...
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(1989)The sudden, rapid advance of the snouts of certain mountain galciers has long been familiar. Systematic study of these phenomena began in 1956, with the catastrophic advance of the snout of the Muldrow Glacier in Alaska. ...
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(2001)In the pre-Upper Carboniferous Malá Fatra Mts. metamophic complex in the Western Carpathians, banded amphibolites and amphibole gneisses include Grt-Cpx-Hbl-Pl metabasites of two types. Type I comprises massive coarse-grained ...
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(1989)Comparison of rocks studied shows that the largest differences between ongonites and elvans from different granite associations are those in the oxides of iron, calcium and phosphorus. The ongonite associated with plumasitic ...
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(2000)Two Type B refractory inclusions, consisting mainly of melilite, fassaite and spinel +/- anorthite, were found in the anomalous Ningqiang carbonaceous chondrite. The composition of melilite varies from #9k4-15 near the ...
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(2005)The occurrences of natural coexisting feldspars including hyalophane and also celsian delineate two-, three- and possibly four-phase fields in the system BaAl2Si2O8-CaAl2Si2O8-NaAlSi3O8-KAlSi3O8. Hyalophane occurs with ...
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(2003)We present 2-D simulations of convection in the Earth's mantle with temperature and damage-dependent viscosity in a basally heated system. The equation governing the temporal evolution of damage includes a source term for ...
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(2002)Interpretation of magnetotelluric (MT) data for three-dimensional (3-D) regional conductivity structures remains uncommon, and two-dimensional (2-D) models are often considered an adequate approach. In this paper we examine ...
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(2001)Recently developed mathematical models of subsidence in extensional basins provide a good basis for forward modeling. However, the large number of parameters to be specified by the user makes it difficult not only to do ...
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(2000)Pressure (P)–temperature (T) paths accurately record movement of metamorphic rocks within the Earth’s crust. 1D geodynamic modeling of P–T-time paths of regional metamorphism have explained many important features of the ...
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(2006)The seafloor is the site of intense biogeochemical and mineral dissolution-precipitation reactions which generate strong gradients in pH near the sediment-overlying water interface. These gradients are usually measured in ...
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(2002)Detachment of the deeper part of subducted lithosphere causes changes in a subduction zone system which may be observed on the Earth's surface. Constraints on the expected magnitudes of these surface effects can aid in the ...
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(1996)A two-dimensional velocity structure for the mantle down to a depth of 700 km derived from super long-range nuclear explosion seismic data recorded along the Quartz profile in northern Eurasia is presented. The profile ...
Now showing items 16325-16344 of 39126