7 results found.
... Science Frontiers ONLINE No. 2: January 1978 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Will radiohalos in coalified wood upset geological clocks?In some coalified wood, uranium-rich solutions have deposited radioactive particles that subsequently decay and create little rings (halos) that can be seen under high magnification. The ra-dii of the rings depend upon the energies of the particles emitted by the radioactive elements. Each type of radioactive decay has a specific half-life. Thus, the patterns of radiohalos help measure the age of coalified wood. A challenge to geology arises because the radiohalos in coalified wood from Jurassic and Triassic formations, supposedly millions of years old, suggest ages of only a few thousand years. (Connor, Steven J.; "Radiohalos in Coalified Wood: New Evidence for a Young Earth," Creation Research Society Quarterly, 14:101, 1977.) From Science Frontiers #2 , January 1978 . 1978-2000 William R. Corliss ...
Terms matched: 1 - Score: 105 - 15 May 2017 - URL: /sf002/sf002p08.htm
... years ago, at depths of 150-300 kilometers, where pressures of 725,000-1 ,000,000 psi are believed to exist. After lengthy cooling periods, the crystalized diamonds were transported to the surface by fluid, lower-melting-point rocks, such as kimberlite. Many South African diamonds are mined from kimberlite pipes. Diamonds are never pure carbon; they always contain some nitrogen and boron. Occasionally, they harbor tiny radioactive impurities; usually alpha-particle emitters in the uranium-238 decay chain. Alphas emitted by these impurities have well-defined energies and penetrate the diamond matrix only so far. If one examines a diamond with a high-power microscope (say, at 100 x), one can see concentric rings surrounding the impurities. These dark radiohalos or "pleochroic" halos have specific radii and can be used to identify the radioisotopes that produced them. So far, so good; but: "The fact that fully formed, optically visible internal radiohalos in diamonds are now presented casts a considerable shadow over current theories of diamond genesis." Actually, the radiohalos pose three challenges to diamond-genesis theory. Problem 1. The half-lives of the halo-creating radioisotopes are measured in thousands of years rather than the billions prescribed for crystallization. In fact some of the half-lives are only minutes or days long. M.H . Armitage comments: "How could these halos become imprinted if the formative cooling processes involved require such lengthy intervals?" Problem 2. The radioactive impurities producing the radiohalos are very tiny ...
Terms matched: 1 - Score: 100 - 15 May 2017 - URL: /sf092/sf092g09.htm
... Science Frontiers ONLINE No. 101: Sep-Oct 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects A TRIPLE ANOMALY IN A DIAMOND Diamonds as gems have an eerie hold on the human mind. Scientists, too, find them mysterious in several ways. Despite considerable study, the origin(s ) of diamonds remain controversial. In SF#92*, we already mentioned and illustrated the unusual orthogonal arrays of hollow tubes discerned in some diamonds at high magnifications (100X). These tubes remain unexplained, as far as we know. Now, in some diamonds, these tubular arrays are found to be associated with radiohalos. Radiohalos are often seen in some common minerals, such as biotite, but, even there, questions of origin persist. (See SF#25 and SF#58.) No one questions that radiohalos, whether in biotite or diamonds, arise from the the decay of radioactive inclusions; that is, mineral specks carrying uranium, thorium, or some other radioactive element. But how did these radioactive specks get lodged inside the hollow tubes which themselves are encased within diamonds? The problem is that these specks have much lower melting points than the diamond matrix. Why wasn't the liquid radioactive material dispersed throughout the higher melting point diamond matrix long before the latter crystallized? The same question must be asked about the radiohalos themselves, because the application of heat quickly anneals and disperses them. Complicating the picture still further is the fact that some of the radiohalos arise from the decay of polonium-210 ...
Terms matched: 1 - Score: 75 - 15 May 2017 - URL: /sf101/sf101g09.htm
... Science Frontiers ONLINE No. 58: Jul-Aug 1988 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Gentry's tiny mystery-- unsupported by geology An article bearing the above title, by J. Richard Wakefield, appeared in the Winter 1987-1988 issue of Creation/Evolution . The title implies that Gentry's "Tiny Mystery" is soon to be demolished. It turns out in the end that a sweeping interpretation of this "Tiny Mystery" is called into question, but the mystery itself, like the smile on the Cheshire cat, remains. The "Tiny Mystery" is the existence of radiohalos from polonium-210, -214, and -218 in some biotites (micas), sans any detectable precursory uranium or halos thereof. Since the half-lives of the polonium isotopes are 138.4 days, 0.000164 second, and 3.04 minutes, respectively, it is certainly perplexing how the polonium halos got where they are! According to geological thinking, the igneous rocks containing the biotites must have been molten for a good deal longer than 138 days, thus destroying halos of short-lived isotopes. R.V . Gentry, a creationist, thinks that the polonium isotopes are primordial -- created by God some 6,000 years ago, in situ and without precursors. The rocks displaying the halos would, therefore, be among the oldest rocks on earth. What Wakefield does is exxamine the geology of some of the sites from which Gentry obtained his biotite samples. ...
Terms matched: 1 - Score: 25 - 15 May 2017 - URL: /sf058/sf058g11.htm
... Frontiers ONLINE No. 25: Jan-Feb 1983 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Three "proofs" of a young earth Responding to letters published in the June 1982 issue of Physics Today that insisted (some, very emotionally) that no evidence exists for a very young earth, Robert V. Gentry summarized three kinds of evidence that certainly seem to undermine current dating schemes. Halos produced by the alpha particles emitted by Po218 are found in granite rocks in many areas. Yet, the half-life of Po218 is only 3 minutes. Since the Po218 has no identifiable pre-cursors in the rock, ". .. how did the surrounding rocks crystalize rapidly enough so that there were crystals available ready to be imprinted with radiohalos by alpha-particles from Po218 ? This would imply almost instantaneous cooling and crystallization of these granitic minerals -- and we know of no mechanism that will remove heat so rapidly; the rocks are supposed to have cooled over millennia, if not tens of millennia." In coalified wood dated as older than 200 million years, the ratio between U238 and Pb206 should be low. It is actually very high. "Thus ages of the entire stratigraphic column may contain epochs less than 0.001% the duration of those now accepted and found in the literature." Diffusion calculations insist that Pb in zircon crystals found in deep granite cores at 313 C should diffuse out of the crystals at the rate of 1% in 300,000 years. No loss of Pb can be detected ...
Terms matched: 1 - Score: 15 - 15 May 2017 - URL: /sf025/sf025p10.htm
... Science Frontiers ONLINE No. 2: January 1978 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology The Stone Enigmas of New England Astronomy Sun-Earth-Moon System May Not Be Stable Changes in Solar Rotation Biology Hopeful Monsters Rather Than Gradual Evolution? Hedgehogs Use Toad Venom for Defense Blind Man Runs on Lunar Time Infections From Comets Geology Will Radiohalos in Coalified Wood Upset Geological Clocks? How Real Are Biological Extinctions in the Fossil Record? Geophysics Another Indian Ocean Light Wheel Ghostly White Disk and Light Beam in Sky Fast-moving Dark Bands Cross Halo The Morning Glory Giant Ball Lightning Psychology Does Man Survive Death? ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /sf002/index.htm
... Giant Basalt Flows and Traps ESD7 Giant Accumulations of Oil ESD8 Giant Erratics and Megabreccias ESD9 Deposits of Great Areal Extent ESI INCLUSIONS ESI1 Inclusions in Crystals ESI2 Microdebris ESI3 Erratic Boulders, Stones, and Mineral Patches ESI4 Anomalous Amber Inclusions ESI5 Microfossil-Like Inclusions ESI6 Oil in Fossil Cavities ESI7 Carbon Dust on Fossil Plants ESI8 Great Rarity of Fossil Meteorites and Tektites ESI9 Stretched Pebbles ESM ANOMALOUS SUPERFICIAL GEOLOGICAL MATERIALS ESM1 Unusual Superficial Aggregations of Rocks ESM2 Strewn Fields of Natural Glasses ESM3 Tektite and Microtektite Paradoxes and Anomalies ESM4 Boulder Trains and Belts ESM5 Rock Glaciers, Block Fields,... ESM6 Elevated Erratics... ESM7 Anomalous Glacial Drift ESM8 Fluidized Debris Slides ESM9 Surging Glaciers ESM10 Driftless Enclaves within Glaciated Regions ESM11 Anomalous Rock Motion ESM12 Superficial Rocky Debris of Doubtful Provenance ESP ANOMALOUS PHYSICAL PHENOMENA IN GEOLOGY ESP1 Anomalous Radiohalos ESP2 Flexible Rocks ESP3 Unusually Colored Rocks ESP4 Noncrushing of Fossils in Sediment Compaction ESP5 Remarkable Polished Rocks ESP6 Ringing Rocks ESP7 Small-Scale Magnetic Anomalies ESP8 Frazil Ice, Anchor Ice,... ESP9 Long-Range Fine Structure In Strata ESP10 Jointing, Cleat, Crack Patterns ESP11 Shocked Mineral Grains at Geological Boundaries ESP12 Radiometric Dating Discordances ESP13 Natural Fission Reactors ESP14 Musical Sands ESP15 Luminous Rocks ESP16 Explosive Rocks ESP17 Dry Quicksand ESP18 Glacieres/Natural Refrigerators ESP19 Radioactive Fossils ESP20 Clustering of Mineralogical Dates in Time and Space ESP21 Random Cracking around Radioactive Inclusions ESR PHENOMENA OF THE OUTER CRUST ESR1 Incompleteness of the Stratigraphic Record ESR2 Lateral Variations in Strata ESR3 Apparently-Inverted Strata ESR4 Near-Global Unconformities ESR5 Rythmites and Cyclothems ESR6 Undisturbed and Unconsolidated Ancient Sediments ESR7 Vertical Stacking of Deposits ESR8 Continent-Type Rocks ...
Terms matched: 1 - Score: 14 - 15 May 2017 - URL: /cat-geol.htm
