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1
Meteorites: A Petrologic, Chemical and Isotopic Synthesis
3.2 Chondrule diversity. (a) Type IA, porphyritic olivine (PO) chondrule; Renazzo,
CR2. Closely packed olivine phenocrysts are set in a dark mesostasis. Larger,
irregular black areas of Fe.Ni metal and troilite, FeS, tend to be concentrated ...
2
The Origin of Chondrules and Chondrites
4.2.5 Gooding-Keil scheme Gooding and Keil (1981) divided the chondrules into
porphyritic and non- porphyritic and then described the mineralogy and texture of
the chondrule. Porphyritic chondrules are porphyritic olivine-pyroxene, ...
3
Chondrules and the Protoplanetary Disk
stantial constraints on chondrule precursors. However, they do reinforce the
possibility that nebular gases played an important role in the formation of
chondrule precursors. What the experiments do not demonstrate is the
importance of ...
Roger H. Hewins, Rhian H. Jones, Edward R. D. Scott, 1996
4
Petrology of
Chondrule Precursors and Sorting of Particles ...
In Part 1, experimental work on the ordinary chondrite QUE97008 is used to develop a set of textural criteria by which a chondrule's degree of partial melting can be qualitatively determined and to test the validity of quantitative measures ...
Jeffrey Wyatt Nettles, 2007
5
Meteorites and the Early Solar System II
Whether this early accreted material survived chondrule formation or was mixed
into the chondrule- forming region soon after it began to cool is unclear. While
recondensation may have aided rim accretion at this stage, it is likely that by the ...
Dante S. Lauretta, Harry Y. McSween, 2006
6
Field Guide to Meteors and Meteorites
Cryptocrystalline (C) chondrule in a Sahara chondrite has a dark gray color
typical of a mass of submicroscopic orthopyroxene crystals. Two chondrule “
craters” are visible on lower left and mid right. Figure 4.57. Granular olivine-
pyroxene ...
O. Richard Norton, Lawrence Chitwood, 2008
7
The History of Meteoritics and Key Meteorite Collections: ...
The different types of chondrite (extract from a classification of all meteorite types
by Rubin 1997) Carbonaceous chondrites CI aqueously altered; chondrule-free;
volatile-rich CM aqueously altered; minichondrule-bearing CR aqueously ...
Gerald Joseph Home McCall, A. J. Bowden, Richard John Howarth, 2006
8
Planet Formation: Theory, Observations, and Experiments
While chondrules must have formed as individual melt droplets in space, meta-
morphic minerals (phosphates and feldspars) of St. Marguerite and Forest Vale
require parent-body accretion, heating and cooling within 2–3 Myr after
chondrule ...
Hubert Klahr, Wolfgang Brandner, 2006
9
Issues in Astronomy and Astrophysics: 2011 Edition
A main reason for this is the difficulties of determining bulk chondrule
compositions,” researchers in London, the United Kingdom report. “A commonly
used technique is to obtain 2D bulk chondrule compositions from meteorite
sections.
10
Metasomatism and the Chemical Transformation of Rock: The ...
15.61 BSE images and combined x-ray elemental maps of the so-called “White
Matrix” (W-mx) and metasomatic alteration of a type IIA chondrule in Tieschitz (H3
.6). (a) BSE image of a typical type IIA chondrule containing abundant ...
Daniel Harlov, Hakon Austrheim, 2012
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Science And Space. The Formation Of Meteorites.
The scientists are now eager to see more asteroid surface sampling and characterization studies, looking for the chondrule-rich crusts that ... «Yareah Magazine, 七月 15»
Meteorites: witnesses of the solar system's birth
The name “chondrule” comes from the Greek “chondros”, which means “small grain”. A meteorite with chondrules is called a chondrite. Igneous ... «The Hindu, 五月 15»
Planet formation relied on sweeping up of small glassy beads, new …
The scientists are now eager to see more asteroid surface sampling and characterization studies, looking for the chondrule-rich crusts that ... «Phys.Org, 四月 15»
Magnetism Not a Major Force in Planetary Formation, Says New Study
Arizona State University astrophysics professor Steve Desch said chondrule magnetism and the overall magnetism present in the developing ... «Yibada, 四月 15»
New Clues from the Dawn of the Solar System
The white arrow is pointing to a large silicate chondrule, and the yellow arrow is pointing to a sulfide chondrule, which is black in this view. «UANews, 三月 15»
A Meteorite Older than Earth Could Tell Us How Planets Were Made
“The really cool thing,” Desch continues, “is that in each chondrule, the magnetic fields recorded by these iron-nickel inclusions have a uniform direction, but one ... «Air & Space Magazine, 一月 15»
Meteorite Like Nike Streaks Through Russian Sky And Social Media
Each chondrule was created from a blend of gas, dust and rocks that finally led to the making of planets in the early stages of the solar system ... «News Every day, 一月 15»
Asteroids May Not Be Planet Building Blocks After All
Chondrule-bearing meteorites — known as chondrites — may thus not be representative of the objects that built the solar system's planets, ... «Yahoo News, 一月 15»
Meteorite material born in molten spray as embryo planets collided
"Chondrule-bearing meteorites have long been thought to be similar to the building blocks of planets," said Minton, who studies planet ... «Purdue Newsroom, 一月 15»
Magnetic fields in early solar system might explain rapid planet …
14 provides the most accurate recordings of chondrule magnetism and sheds light on the role magnetic fields played in the formation of young ... «The State Press, 十二月 14»
