X ray detection of disordered orthopyroxenes in meteorite

Pollack, S. S.

English

NASA Technical Reports Server

FINAL REPORT 
I 
X-RAY DETECTION OF DISORDERED ORTHOPYROXENES IN METEORITES 
(from June 1, ,1966 through October 31, 1970) 
National Aeronautics & Space Administration 
Washington, D.C. 20546 
Contract No. NGR 39-008-013 
Mellon Institute Research Project No. 4424 
by 
, S. S. Pollack 
1970 
https://ntrs.nasa.gov/search.jsp?R=19710007589 2020-03-12T00:23:29+00:00Z
INTRODUCTION 
This f i n a l  r e p o r t  c o n s i s t s  of a  s e c t i o n  summarizing t h e  p a s t  
f o u r  years  work and a  s e c t i o n  covering the  new work, q u a n t i t a t i v e  a n a l y s i s  
of  o l i v i n e  i n  me teo r i t e s  and o the r  rocks. 
The sununary p a r t  c o n s i s t s  of two e a r l i e r  pub l i ca t ions ,  " D i s -  
ordered Pyroxene i n  Chondrites",  and " E n s t a t i t e  Produced by a  Megabar 
Shock Event1', an e a r l i e r  semi-annual r e p o r t  showing the  r e l a t i o n s h i p  
between x-ray s i n g l e - c r y s t a l  photographs and shock i n  chondr i t e s ,  two 
t a b l e s  sunxnarizing t h e  occurrence of d i sordered  pyroxene i n  mesos ide r i t e s ,  
e u c r i t e s  and howadites.  The new work c o ~ l t a i n s  the  % o l i v i n e  and Mole % 
f o r s t e r i t e  i n  64 me teo r i t e s .  
Quan t i t a t i ve  Analysis of Ol iv ine  
I n  Table I the  chondr i tes  a r e  grouped according t o  t h e  Von 
Schmus and Wood p e t r o l o g i c  c l a s s i f i c a t i o n .  There i s  some over lap ,  bu t  
i n  gene ra l ,  the  L group chondr i tes  have l e s s  o l i v i n e  than the  LL group 
and more than  the  H group. Icnyahinya wi th  an L group o l i v i n e  composition 
has a  much h igher  o l i v i n e  content .  Guarena and Selma a l s o  have h igher  
1 
o l i v i n e  content  than  t h e  o ther  members of t he  H group. .Most of the H group 
conta ins  between 24 and 37% o l i v i q e .  I n  t he  L group, most f a l l  between 
40 and 52% and i n  the LL group, between 45 and 61% o l i v i n e .  The es t imated  
probable e r r o r  i n  the x-ray measurements i s  5% of the  o l i v i n e  determinat ion.  
The t a b l e  below shows the average o l i v i n e  content  of the LL, L and H 
pe t ro log ic  types,  The o l i v i n e  percentages i n  L 4 ,  LS and L6 a r e  almost 
Average % O l i v i n e  
4 
i d e n t i c a l ,  and those  i n  H 3 ,  H4, H5 and H6 a r e  very  s i m i l a r .  The uniform 
o l i v i n e  composition w i t h i n  these  groups sugges ts  t h a t  the mineralogy w i t h i n  
t h e  L and H groups has always been t h e  same. 
To ta l  q u a n t i t a t i v e  minera logica l  a n a l y s i s  of the chondr i tes  should 
show more d e f i n i t e l y  whether o r  no t  they have changed s i n c e  c r y s t a l l i z a t i o n .  
The d i f f e r ences  i n  mineralogy wi th in  the  H and L groups probably a r e  due t o  
v a r i a t i o n s  i n  temperature o r  composition a t  t he  time of chondr i t e  
o r  chondr i t e  formation. 
Table I1 l is ts  the  o l i v i n e  content  of some t e r r e s t r i a l  and oceanic  
rocks.  
TABLE I 
Mole % Fo 
% This  
Me teo r i t e  O l iv ine  Museum Spec No. Work Mason 
L 3 B a r r a t  t a  
L4 B ju rbole  
Goodland 
L 5 Arapahoe .41  
Knya hinya 4 7 
Roy (1933) 52 
Ta iban  45 
45 - . . 74.5 74 
4 6 ASU 425.1 77.5 7 5 
L6 Abernathy 44 
Brews t e r  -4 6 
Bruderhe i m  43 
Coon B u t t e  4 7 
Densmore ' 49 
Dwight 44 
H a r r i s o n v i l l e  42 
Holbroolc 50 
Leedey 41 
Marion Iowa 48 
Modoc 4 7 
Ness County (1894) 44 
New Concord 41 
O t i s  48 
Pee tz  4 9 
Rush Creek 41 
Utrecht  44 
Walters  46 
ASU 465.1X 
UShQf 464 
A6U 234.110 
ASU 541.1 
ASU 476.1X 
ASU 483.1X 
ASU 705 
ASU 533.1 
- - -  
ASU 468.5 
ASU 176.20 
ASU H52 
ASU 498.1 
ASU 244a 
USm1 360 
ASU 87.8 
ASU 202.1 
ASU 467.5 
ASU 422.1 
ASU 2 76.1X 
GMI 
ASU 655.1 
Untyped L Chondri tes  
Akron #3 (1961) 45 ASU 112.8 77.5 7 5 
Ca l l  iham 49 ASU C70.16 76.2 7 7 
Cashion 3 6 ---  75.0 82 
New Almelo 38 ASU 144.10 76.1 7 6 
LL 3 Cha i.npur 55 UShT4 1251 71.7 - - 
LL4 Kelly 61 ASU 398.1X 72.5 7 1 
Mole % Fo 
% T h i s  
M e t e o r i t e  O l i v i n e  Museumspec.  N o . ,  Work Mason 
LL5 O b e r l i n  4 9 ASU 293ax 73.7 7 3 
LL6 Arcad ia  4 5 ASU 390.2  73 .3  7 1  
Lake L a b y r i n t h  5 5 ASU 369.2 72 .2  72 
S t .  S e v e r i n  52 USNM 2608 7 3 . 0  7 1  
H 3  C l o v i s  
Grady #2 (1937) 
USNM 2170 
+su 373.4X 
H4 Ba th  
Gruver , Texas 
Selma 
Seminole ,  Texas 
USNM 201 
- - - 
USN1 3422 
- - - 
~ ( 3 , 4 )  D i m m i t t  ASU 49.13 
H(4,5) Yonozu USNM 1434 
H5 Hugoton 
P u l t u s k  
S c u r r y  
H6 Cedar ,  Kansas 
E s  t a c a d o  
Glads t o n e  
Guarena 
  or land 
Oakley 
ASU 408. l X  
ASU 44.3  
ASU 315.1 
USNM 1469 
ASU 282d 
ASU 152a 
Untyped H C h o n d r i t e s  
Lakewood 
P l a i n s ,  Texas 
P o r t a l e s  #3 
T e l l  
Wellman 
Wellman #3  
O L I V I N E  CONTENT AND MOLE % FORSTERLTE (Fo) I N  CHONDRITES 
-- -- 
Meteor i te  
Mole % Fo 
This 
Ol iv ine  Museum Spec. No. Work Mas on 
C 3 Allende 
E f  r emovka 
Karoonda 
8 7 --- 
3 1 
29 I 6 O  USNM 2348 
7 2 USNM 528 1 
Unclass i f ied  
Cumberland F a l l s  18 ASU 26a 99.0 - - 
Winona 17 USNM 854  94.5 9 5 
ASU Arizona S t a t e  Un ive r s i t y  
USNM U. S. Nat iona l  Museum 
G M I  ~ e o l o ~ i c a l - & f i n e r a l o g i c a l  I n s t i t u t e ,  Ut recht  
TABLE I1 
OCEANIC BASALTS AND TERRESTRIAL ROCKS 
Sample % O l i v i n e  Mole % F o r s t e r i t e  
O l i v i n e  bomb 
San C a r l o s ,  New Mexico 
Gabbro, Wich i ta  
M t s .  , Oklahoma 
S h o n k i n i t e ,  n e a r  
B u t t e ,  Montana 
Leg I11 Oceanic B a s a l t s  
3-14-10-1 n e a r  base  9 8  6  
3- 15- 10- 1 Less t h a n  5 
3-18-7-1 15-16 cm 2-5 8  6 
3-19-12-1 Less t h a n  5 
B a s a l t s  dredged by Chain 
Chain 1-2 
" g l a s s y  p o r t i o n "  : 
Chain 1-2 
" c r y s t a l l i n e  p o r t i o n "  
Chain 36-5-12 
Chain 36-5-41 
Chain 43-107-3 
Chain  43-104-16 
Less t h a n  5 
Less t h a n  5 
20.6 
Less t h a n  5 
Less than  5  
S W Y  OF PAST WORK 
TABLE 111 
----- 
YlSOSiDERiTES WEICE .HAVE BEEN STUDLED USING 
SINGLE-CRYSTAL X-RAY TECHNIQE 
Mesos i d e r i t e s  
Bondoc 
Clover  S p r i n g s  
Crab Orchard 
E s  t h e r v i  1 l e  
Ha inho  1 z 
Morr is town 
M t .  Padbury 
Patwar . 
Vaca Muerte 
Veramin 
Ordered or thopyroxene was found i n  a l l  o f  t h e  above m e s o s i d e r i t e s  e x c e p t  
c r a b  o r c h a r d  which c o n t a i n e d  o r d e r e d  c l inopyroxene.  
TABLE TV 
TYPE OF PYROXENE FOUND I N  EUCRZTES AND HOWARDlTES 
Type of  s i n g l e - c r y s t a l  
Achondr i t e  p a t t e r n  produced by 
- pyroxenes 
Bereba 
Bununu 
Bholgat  i 
Franlcf o r  t 
Har a i y a  
Jonzac 
J u v i n a s  
Luo t o l a x  
Pasamonte 
Peramiho Eu 
Sioux County E u 
Disordered  o r t h o  & twinned 
c l i n o  
Twinned c l i n o  & d i s o r d e r e d  
o r t h o ;  untwinned c l i n o ,  o r d e r e d  
o r  t h o  
t 
o r d e r e d  o r t h o ;  d i s o r d e r e d  o r t h o  
o r d e r e d  o r  t h o  
untwinned c l i n o  
twinned c l i n o  
c l i n o  
o r d e r e d  o r  t h o  
untwinned c l i n o  
o r d e r e d  o r t h o ;  d i s o r d e r e d  o r t h o ;  
untwinned c l i n o  
d i s o r d e r e d  o r t h o  


X-ray detection of disordered orthopyroxenes in meteorites Final report, 1 Jun. 1966 - 31 Oct. 1970

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