[meteorite-list] Feldspar minerals in the inclusions in earthly/lunar bas...

From: mafer_at_domafer.com <mafer_at_meteoritecentral.com>
Date: Thu Apr 22 10:06:15 2004
Message-ID: <019701c287a2$f49ee160$6401a8c0_at_vs.shawcable.net>

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Thanks Paul
I'm relatively new to meteoritics, reading all I can thats relevant (our =
school library has some of the classic must read like Todd, Wesson and =
the like and I've read both those and one other (his name eludes me =
right now, but his book was on opaque minerals in meteorites, and to be =
truthful, if I try and remember specifics about what I read, I can't for =
the life of me remember it, but ask a question, and then I seem to =
remember reading this or that on it. Some of what the books cover is =
over my head (geo-chemistry and geo-physics are both items I haven't =
touched) but I do understand microprobe analysis and have done xray =
diffraction and xray spectrometry testing on mineral samples and have =
passed the obligatory courses on petrology and mineralogy so can follow =
ok. And since half the profs at school are either volcanologist types or =
heavy into plate tectonics, I gotten a good dose of volcano science. I =
am having, though, a problem explaining why I figure a glacier or a =
paleo-glacier is a good potential source for meteorites to our resident =
glaciologist. He figures the odds are pretty slim that a meteorite would =
land in a glacier, and if it did, looking through the moraines for it, =
would be a tedious task. My reasoning is, a glacier often cover many =
square miles of surface, and any meteorite landing on it would end up in =
the moraine, and thus, at least, localize my search field, and should be =
a great place to look for micro-meteorites since they account for about =
99% of the space debris that hits the earth annually. So, I've got my =
large rare earth magnets, my metal detector and next year, I'll be =
scouting the glaciers on Mt Baker.
Mark




----- Original Message -----=20
  From: LITIG8NSHARK_at_aol.com=20
  To: mafer_at_domafer.com ; bsoerhei@online.no=20
  Cc: Meteorite-list_at_meteoritecentral.com=20
  Sent: Friday, November 08, 2002 7:25 PM
  Subject: Re: [meteorite-list] Feldspar minerals in the inclusions in =
earthly/lunar bas...


  Good evening Folks,=20

  I must say that I am grateful that I am not paying for the current =
lesson in meteoritics. I couldn't afford it. Education like this is =
invaluable. Thank you very much Mark for your expertise.=20

  Best Regards to all of you,=20

  Paul=20

  In a message dated 11/8/2002 10:08:23 PM Eastern Standard Time, =
mafer_at_domafer.com writes:=20



    Minerals, regardless of where they are from, earth, moon or mars, =
are still=20
    those minerals and as such have properties that will identify them =
as such.=20
    I guess what I'm saying is that the elements of which the minerals =
are made=20
    of are the same, no matter if from here or there, and so, the =
minerals which=20
    are made of them will be made according to the same rules. Some form =
only=20
    under high presure and temperature, others form onder other =
conditions of=20
    temperature and pressure. And! some can only form in the presence of =
water.=20
    So, from these knowns, researchers know that, from extensive =
evaluation of=20
    earths lava fields and the plutonic outcroppings ( a pluton is =
magmatic=20
    material which has never been extruded on the surface and is exposed =
after=20
    millenia of weathering and erosion), the stoney irons cannot be from =
earth=20
    for we see no occurances of olivine and metal together "on" earth.=20
    Therefore, knowing how they formed individually (temps and =
pressures) they=20
    summise that these meteorites come from a core mantle boundry. =
Something we=20
    have not any first hand proof of. Inclusions, on the other hand, of=20
    feldspars, are quite common in cooled magmas and the resulting stone =
is=20
    called a porphory if the inclusions are large enough to be seen and =
are=20
    relatively well formed. Other tests, such as fizzing in hcl only =
provides a=20
    indication that a basic mineral (carbonate or such) is present. The =
fact=20
    that you, if I'm understanding right, are seeing what appears to be=20
    feldspars, most likely points to a magmatic origin. vesicle size is =
not a=20
    determinate of being magmatic or not, andesites can often have =
extemely=20
    small vesicles. And, if I'm not wrong, I believe in Sweden is quite =
a bit of=20
    plutonic rock, so its probable to be able to find lavas since =
plutons are=20
    but cooled magma chambers.=20
    Hope this helps, long winded as it is.=20
    Mark




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<DIV><FONT size=3D2>Thanks Paul</FONT></DIV>
<DIV><FONT size=3D2>I'm relatively new to meteoritics, reading all I can =
thats=20
relevant (our school library has some of the classic must read like =
Todd, Wesson=20
and the like and I've read both those and one other (his name eludes me =
right=20
now, but his book was on opaque minerals in meteorites, and to be =
truthful, if I=20
try and remember specifics about what I read, I can't for the life of me =

remember it, but ask a question, and then I seem to remember reading =
this or=20
that on it. Some of what the books cover is over my head (geo-chemistry =
and=20
geo-physics are both items I haven't touched) but I do understand =
microprobe=20
analysis and have done xray diffraction and xray spectrometry testing on =
mineral=20
samples and have passed the obligatory courses on petrology and =
mineralogy so=20
can follow ok. And since half the profs at school are either =
volcanologist types=20
or heavy into plate tectonics, I gotten a good dose of volcano science. =
I am=20
having, though, a problem explaining why I figure a glacier or a =
paleo-glacier=20
is a good potential source for meteorites to our resident glaciologist. =
He=20
figures the odds are pretty slim that a meteorite would land in a =
glacier, and=20
if it did, looking through the moraines for it, would be a tedious task. =
My=20
reasoning is, a glacier often cover many square miles of surface, and =
any=20
meteorite landing on it would end up in the moraine, and thus, at least, =

localize my search field, and should be a great place to look for=20
micro-meteorites since they account for about 99% of the space debris =
that hits=20
the earth annually. So, I've got my large rare earth magnets, my metal =
detector=20
and next year, I'll be scouting the glaciers on Mt Baker.</FONT></DIV>
<DIV><FONT size=3D2>Mark</FONT></DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV>----- Original Message ----- </DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-RIGHT: 0px">
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A href=3D"mailto:LITIG8NSHARK_at_aol.com"=20
  title=3DLITIG8NSHARK_at_aol.com>LITIG8NSHARK@aol.com</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
href=3D"mailto:mafer_at_domafer.com"=20
  title=3Dmafer_at_domafer.com>mafer@domafer.com</A> ; <A=20
  href=3D"mailto:bsoerhei_at_online.no"=20
  title=3Dbsoerhei_at_online.no>bsoerhei@online.no</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Cc:</B> <A=20
  href=3D"mailto:Meteorite-list_at_meteoritecentral.com"=20
  =
title=3DMeteorite-list_at_meteoritecentral.com>Meteorite-list@meteoritecentr=
al.com</A>=20
  </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Friday, November 08, 2002 =
7:25=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: [meteorite-list] =
Feldspar=20
  minerals in the inclusions in earthly/lunar bas...</DIV>
  <DIV><BR></DIV><FONT face=3Darial,helvetica><FONT color=3D#0000ff =
size=3D3>Good=20
  evening Folks, <BR><BR>I must say that I am grateful that I am not =
paying for=20
  the current lesson in meteoritics. I couldn't afford it. =
&nbsp;Education like=20
  this is invaluable. &nbsp;Thank you very much Mark for your expertise. =

  <BR><BR>Best Regards to all of you, <BR><BR>Paul <BR><BR>In a message =
dated=20
  11/8/2002 10:08:23 PM Eastern Standard Time, <A=20
  href=3D"mailto:mafer_at_domafer.com">mafer@domafer.com</A> writes:=20
  <BR><BR></FONT><FONT color=3D#000000 face=3DArial lang=3D0 size=3D2=20
  FAMILY=3D"SANSSERIF"><BR>
  <BLOCKQUOTE=20
  style=3D"BORDER-LEFT: #0000ff 2px solid; MARGIN-LEFT: 5px; =
MARGIN-RIGHT: 0px; PADDING-LEFT: 5px"=20
  TYPE=3D"CITE">Minerals, regardless of where they are from, earth, moon =
or=20
    mars, are still <BR>those minerals and as such have properties that =
will=20
    identify them as such. <BR>I guess what I'm saying is that the =
elements of=20
    which the minerals are made <BR>of are the same, no matter if from =
here or=20
    there, and so, the minerals which <BR>are made of them will be made=20
    according to the same rules. Some form only <BR>under high presure =
and=20
    temperature, others form onder other conditions of <BR>temperature =
and=20
    pressure. And! some can only form in the presence of water. <BR>So, =
from=20
    these knowns, researchers know that, from extensive evaluation of =
<BR>earths=20
    lava fields and the plutonic outcroppings ( a pluton is magmatic=20
    <BR>material which has never been extruded on the surface and is =
exposed=20
    after <BR>millenia of weathering and erosion), the stoney irons =
cannot be=20
    from earth <BR>for we see no occurances of olivine and metal =
together "on"=20
    earth. <BR>Therefore, knowing how they formed individually (temps =
and=20
    pressures) they <BR>summise that these meteorites come from a core =
mantle=20
    boundry. Something we <BR>have not any first hand proof of. =
Inclusions, on=20
    the other hand, of <BR>feldspars, are quite common in cooled magmas =
and the=20
    resulting stone is <BR>called a porphory if the inclusions are large =
enough=20
    to be seen and are <BR>relatively well formed. Other tests, such as =
fizzing=20
    in hcl only provides a <BR>indication that a basic mineral =
(carbonate or=20
    such) is present. The fact <BR>that you, if I'm understanding right, =
are=20
    seeing what appears to be <BR>feldspars, most likely points to a =
magmatic=20
    origin. vesicle size is not a <BR>determinate of being magmatic or =
not,=20
    andesites can often have extemely <BR>small vesicles. And, if I'm =
not wrong,=20
    I believe in Sweden is quite a bit of <BR>plutonic rock, so its =
probable to=20
    be able to find lavas since plutons are <BR>but cooled magma =
chambers.=20
    <BR>Hope this helps, long winded as it is.=20
  <BR>Mark</BLOCKQUOTE><BR></FONT><FONT color=3D#0000ff face=3DArial =
lang=3D0 size=3D3=20
  FAMILY=3D"SANSSERIF"><BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>

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Received on Fri 08 Nov 2002 10:49:04 PM PST