New fayalite standard allows the 53Mn-53Cr chronology of aqueous alteration on chondritic parent bodies. The data indicate that hydrated asteroids, at least those ...
Mineralogical and textural characteristics of various meteorites reveal ... Meta-morphous steps during evolution of a chondritic body, form concentric belts. ...
Partition coefficients and bulk repartition coefficient (Kd and D) ... Nb and Ta (Nb/Ta chondritic 15-20, less for crustal rocks) Zr and Hf (Zr/Hf chondritic 30-35) ...
Chondrules are mysterious millimeter-sized rocky droplets in chondritic meteorites. They formed during the first 5 million years of the Solar System, have diverse
upper mantle) has approximately CI chondritic ratios of refractory. lithophile elements. ... its core over a much longer time period (~30 M.yr) than asteroids (1-3 M. ...
... mass of the solar system; planets are 1 ... The Age of the Solar System ... The age of the solar system can be measured by analyzing chondritic meteorites ...
... MORB SPREADING RATES OCEANIC CRUST AND UPPER MANTLE STRUCTURE EVIDENCE Seismic Velocities Deep Sea Drilling Program Ophiolites Dredging of Fracture Zone ...
Viscous Heating in the Mantle Induced by Glacial Forcing Ladislav Hanyk1, Ctirad Matyska1 and David A. Yuen2 e-mail: ladislav.hanyk@mff.cuni.cz, www: http://geo.mff ...
T.M Harrison, J. Blichert-Toft, W. M ller, F. Albarede, P. Holden, S.J. Mojzsis. Science 2005 ... Heterogeneous Hadean Hafnium: Evidence of Continental Crust at ...
Olivine composition changes with oxygen fugacity such that it has an enormous ... from Righter (2003) Metal-silicate partition coefficients are fO2 dependent ...
Earthquakes extend to 600 km beneath Lau Basin. Note that tomographic image slab appears to terminate at 660 km ... Island Arc Petrogenesis. Figure 16-11b. ...
U and Th are thought to be absent from the core and present in the mantle and crust. ... measure U and Th content in the mantle. Important for mantle convection. ...
Asteroids belonging to the taxonomic M-class have historically been identified ... differentiated parent bodies, exposed over time through collisional processes. ...
Planetesimal heating. 26Al as tool for radiometric dating: ... 26Al as planetesimal heat source: ... stronger heated planetesimals have earlier formed chondrule ...
Heat is a form of energy, and so the basic equations that describe heat and heat ... of rocks is relative low, and is fairly similar for many different rock types: ...
is scattered by a large one, nearly missing it and thus gaining an ... from the Keck Observatory Laser Guide Star Adaptive Optics system. Satellites are seen ...
Temperature of convective planet is buffered through thermally activated rheology ... Results dominated by strong temperature dependence of rheology. ...
Mare basalt. 3.3 Ga. 14-15% MgO. near primary precursors to high TiO2 basalts. ... cumulate from a pre-mare basaltic melt. Exp method. spherule sample ...
Composed of silicate rocks with abundant iron and magnesium. Density ranges from 3.2 to 5 g/cm3 ... discovered the P' discontinuity [P-wave deflections at ...
Meteorites, Ice and Antarctica by William A. Cassidy. How many meteorites has ... The recovery of meteorites from Antarctica by ANSMET continues to provoke ...
Comet Shoemaker-Levy 9. Meteor Showers. Dust from comet that remains in original comet's orbit. ... Oct 9. Draconids. 50. Swift-Tuttle. Aug 12. Perseids. 20 ...
Obtain information on the combined evolution of Baltic-Greenland in the Archaean. Archaean alkaline complexes are rare worldwide and in Greenland and the Baltic ...
Water s Beginnings * How much water does the average person use each day domestically? Average daily household water use Average annual household water use * Thales ...
Lecture 11: Periodic table, geochemical affinity, core formation, lunar origin Last time, we made the Earth and discussed how much of each element was incorporated ...
Vast majority of Jupiter's mass is metallic hydrogen, but only 2/3 of Saturn's ... Guillot (1994) showed only small radiative windows in Jupiter, Saturn, and Neptune ...
Space Dust recovered from the Stratosphere. Max Wallis. Nori Miyake. Chandra Wickramasinghe ... Examples of Particles Discovered under Scanning Electron Microscopy ...
Composition is unique in solar system. 78% nitrogen. 21% oxygen (not present in ... Layers defined by composition and physical properties. Compositional layers ...
The parent asteroids of chondrites may have accreted farther ... This could account for the heliocentric zoning of the asteroid belt (Grimm and McSween, 1993) ...
Nucleus seems to be composed of several fragments. ... One thing 'Armageddon' got right ' ... for 'Armageddon': $34.8 million. The Threat is Real. In any year...
... G. Masters, D Price & M.J. Gillan 'Can the Earth's dynamo run on heat alone? ... Round up 1000 MW/K. And find the heat flux ... E = 262 MW/K Dynamo fails ...
Augite (Calcium Sodium Magnesium Iron Aluminum Silicate) Diopside (Calcium ... For example, ALH 84001 was first meteorite discovered in 1984-1985 field season ...
GEOCHRONOLOGY. USE OF RADIOGENIC ISOTOPES AS DATING TOOLS AND GEOCHEMICAL TRACERS ... A major disadvantage of K-Ar dating it that Ar is easily lost from many ...
(Peck et al., 2001) Preservation of d18O is demonstrated by; ... Peck et al., 2001. Timing of Terrestrial Water. 2 Evidence for the oldest age constraint ...