The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements
Thirty-eight ordinary chondrites (17 H, 20 L, and 1 LL) have been analyzed for major and selected trace elements. These data indicate that the lithophile elements Mg, Ca, Al, Cr, and V normalized to Si are in higher abundance in the H than in the L chondrites. The siderophile elements Ni, Co, and Fe...
Main Authors: | , |
---|---|
Format: | Other/Unknown Material |
Language: | unknown |
Published: |
1984
|
Subjects: | |
Online Access: | http://ntrs.nasa.gov/search.jsp?R=19840043304 |
id |
ftnasantrs:oai:casi.ntrs.nasa.gov:19840043304 |
---|---|
record_format |
openpolar |
spelling |
ftnasantrs:oai:casi.ntrs.nasa.gov:19840043304 2023-05-15T13:40:59+02:00 The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements Fulton, C. R. Rhodes, J. M. Unclassified, Unlimited, Publicly available Feb 15, 1984 http://ntrs.nasa.gov/search.jsp?R=19840043304 unknown http://ntrs.nasa.gov/search.jsp?R=19840043304 Accession ID: 84A26091 Copyright Other Sources 91 Journal of Geophysical Research, Supplement; 89; B543-B55 1984 ftnasantrs 2012-02-15T15:51:12Z Thirty-eight ordinary chondrites (17 H, 20 L, and 1 LL) have been analyzed for major and selected trace elements. These data indicate that the lithophile elements Mg, Ca, Al, Cr, and V normalized to Si are in higher abundance in the H than in the L chondrites. The siderophile elements Ni, Co, and Fe show very good correlation within, as well as between, the two major ordinary chondrite groups. Twenty-four of the analyses are of Antarctic finds, while ten are samples of falls. Comparing the Antarctic data with the fall data reveals no evidence that any of the elements studied here have been mobilized by terrestrial weathering processes. Within the H and L chondrite groups there is little chemical variation, indicating that the source of these samples is remarkably homogeneous. Equilibrium condensate fractionation from a nebula of CI composition can result in the observed ordinary chondrite compositions. The fractionation of metal at about 1440 K (and 0.001 atm) into high and low iron groups, followed by a gas-solid fractionation at about 1380 K with the H group losing more solids than the L, will produce the observed H and L compositions and intragroup trends. Other/Unknown Material Antarc* Antarctic NASA Technical Reports Server (NTRS) Antarctic The Antarctic |
institution |
Open Polar |
collection |
NASA Technical Reports Server (NTRS) |
op_collection_id |
ftnasantrs |
language |
unknown |
topic |
91 |
spellingShingle |
91 Fulton, C. R. Rhodes, J. M. The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
topic_facet |
91 |
description |
Thirty-eight ordinary chondrites (17 H, 20 L, and 1 LL) have been analyzed for major and selected trace elements. These data indicate that the lithophile elements Mg, Ca, Al, Cr, and V normalized to Si are in higher abundance in the H than in the L chondrites. The siderophile elements Ni, Co, and Fe show very good correlation within, as well as between, the two major ordinary chondrite groups. Twenty-four of the analyses are of Antarctic finds, while ten are samples of falls. Comparing the Antarctic data with the fall data reveals no evidence that any of the elements studied here have been mobilized by terrestrial weathering processes. Within the H and L chondrite groups there is little chemical variation, indicating that the source of these samples is remarkably homogeneous. Equilibrium condensate fractionation from a nebula of CI composition can result in the observed ordinary chondrite compositions. The fractionation of metal at about 1440 K (and 0.001 atm) into high and low iron groups, followed by a gas-solid fractionation at about 1380 K with the H group losing more solids than the L, will produce the observed H and L compositions and intragroup trends. |
format |
Other/Unknown Material |
author |
Fulton, C. R. Rhodes, J. M. |
author_facet |
Fulton, C. R. Rhodes, J. M. |
author_sort |
Fulton, C. R. |
title |
The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
title_short |
The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
title_full |
The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
title_fullStr |
The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
title_full_unstemmed |
The chemistry and origin of the ordinary chondrites Implications from refractory-lithophile and siderophile elements |
title_sort |
chemistry and origin of the ordinary chondrites implications from refractory-lithophile and siderophile elements |
publishDate |
1984 |
url |
http://ntrs.nasa.gov/search.jsp?R=19840043304 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Antarctic The Antarctic |
geographic_facet |
Antarctic The Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_source |
Other Sources |
op_relation |
http://ntrs.nasa.gov/search.jsp?R=19840043304 Accession ID: 84A26091 |
op_rights |
Copyright |
_version_ |
1766144101709774848 |