Browsing by Title
- DSpace Home
- →
- Browsing by Title
JavaScript is disabled for your browser. Some features of this site may not work without it.
Browsing by Title
Now showing items 16399-16418 of 39124
-
(2000)230Th, 232Th, 234U and 238U compositions of several deep-sea solitary corals, mainly the species Desmophyllum cristagalli, were determined by thermal ionization mass spectrometry (TIMS). It is possible to obtain high ...
-
(2005)Both theoretical and empirical evidence shows that intracrystalline U-Th heterogeneity in zircon can lead to biases in (U-Th)/He ages if not accurately accounted for in a-ejection corrections. We present a model for age ...
-
(2003)We performed a systematic study of (U-Th)/He ages of volcanic zircons of known eruption age to establish a reliable protocol for zircon He dating and to validate the resulting ages. Using laser He extraction and dissolution ...
-
(2003)The 238U-230Th-226Ra and 235U-321Pa disequilibria have been measured by mass spectrometry in historic lavas from the Kamchatka arc. The samples come from three closely located volcanoes in the Central Kamchatka Depression ...
-
(2004)In order to investigate the potential of combined Th-U-Pb isotope and 230Th/238U disequilibrium systematics for tracing magmatic crystallization and melt evolution, conventional high-resolution single-crystal TIMS techniques ...
-
(1995)The U-Th-Pb and Sm-Nd isotopic systematics of mineral separates from the Goalpara ureilite were studied after applying acid leaching techniques. The separates were successively leached with dilute HBr and HNO3 in order to ...
-
(2002)The dominant occurrence of phosphate minerals in crystalline rocks is as accessory phases, most notably apatite, monazite, and xenotime. Because these minerals tend, to varying degrees, to partition U and Th into their ...
-
(2001)The alkenone producing species Isochrysis galbana has been cultured at different temperatures, nutrient and light levels, to investigate effects of genetic and environmental variation on U37K'. The experiments show that: ...
-
(2003)Type II porphyritic chondrules commonly contain several large (>40 μm) olivine phenocrysts; furnace-based cooling rates based on the assumption that these phenocrysts grew in a single-stage melting-cooling event yield ...
-
(2001)For many years the presence of waxes in crude oils has been associated with organic matter derived from terrigenous sources. High temperature gas chromatography (HTGC) has been used to establish the ubiquitous presence of ...
-
(2004)In the period of earthquake preparation, electromagnetic emissions appear over the seismic zones. In this work magma movements are considered as a possible source of ULF electromagnetic emissions over the zones with volcanic ...
-
(2004)Ultra-calcic ankaramitic magmas or melt inclusions are ubiquitous in arc, ocean-island and mid-ocean ridge settings. They are primitive in character (XMg 4 0 65) and have high CaO contents (414 wt %) and CaO/Al2O3 (41 1). ...
-
(2001)A fundamentally new model is proposed for the generation of heat and ultradeep fluids in the Earth's liquid core. Considering the rheological properties of the liquid core (viscosity from 103-105 to 107-109 poises), pressure ...
-
(1997)A high-resolution calculation of strongly time-dependent thermal convection in the upper mantle with non-Newtonian, temperature-dependent rheology shows that, for an effective Rayleigh number of around 106, extremely fast ...
Now showing items 16399-16418 of 39124