Characterization and petrologic interpretation of olivine-rich basalts at Gusev Crater, Mars

Rocks on the floor of Gusev crater are basalts of uniform composition and mineralogy. Olivine, the only mineral to have been identified or inferred from data by all instruments on the Spirit rover, is especially abundant in these rocks. These picritic basalts are similar in many respects to certain...

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Veröffentlicht in:Journal of Geophysical Research. E. Planets 2006-01, Vol.111 (E2), p.n/a
Hauptverfasser: McSween, H. Y., Wyatt, M. B, Gellert, R., Bell III, J. F., Morris, R. V., Herkenhoff, K. E., Crumpler, L. S., Milam, K. A., Stockstill, K. R., Tornabene, L. L., Arvidson, R. E., Bartlett, P., Blaney, D., Cabrol, N. A., Christensen, P. R., Clark, B. C., Crisp, J. A., Des Marais, D. J., Economou, T., Farmer, J. D., Farrand, W., Ghosh, A., Golombek, M., Gorevan, S., Greeley, R., Hamilton, V. E., Johnson, J. R., Joliff, B. L., Klingelhöfer, G., Knudson, A. T., McLennan, S., Ming, D., Moersch, J. E., Rieder, R., Ruff, S. W., Schröder, C., de Souza Jr, P. A., Squyres, S. W., Wänke, H., Wang, A., Yen, A., Zipfel, J.
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container_title Journal of Geophysical Research. E. Planets
container_volume 111
creator McSween, H. Y.
Wyatt, M. B
Gellert, R.
Bell III, J. F.
Morris, R. V.
Herkenhoff, K. E.
Crumpler, L. S.
Milam, K. A.
Stockstill, K. R.
Tornabene, L. L.
Arvidson, R. E.
Bartlett, P.
Blaney, D.
Cabrol, N. A.
Christensen, P. R.
Clark, B. C.
Crisp, J. A.
Des Marais, D. J.
Economou, T.
Farmer, J. D.
Farrand, W.
Ghosh, A.
Golombek, M.
Gorevan, S.
Greeley, R.
Hamilton, V. E.
Johnson, J. R.
Joliff, B. L.
Klingelhöfer, G.
Knudson, A. T.
McLennan, S.
Ming, D.
Moersch, J. E.
Rieder, R.
Ruff, S. W.
Schröder, C.
de Souza Jr, P. A.
Squyres, S. W.
Wänke, H.
Wang, A.
Yen, A.
Zipfel, J.
description Rocks on the floor of Gusev crater are basalts of uniform composition and mineralogy. Olivine, the only mineral to have been identified or inferred from data by all instruments on the Spirit rover, is especially abundant in these rocks. These picritic basalts are similar in many respects to certain Martian meteorites (olivine‐phyric shergottites). The olivine megacrysts in both have intermediate compositions, with modal abundances ranging up to 20–30%. Associated minerals in both include low‐calcium and high‐calcium pyroxenes, plagioclase of intermediate composition, iron‐titanium‐chromium oxides, and phosphate. These rocks also share minor element trends, reflected in their nickel‐magnesium and chromium‐magnesium ratios. Gusev basalts and shergottites appear to have formed from primitive magmas produced by melting an undepleted mantle at depth and erupted without significant fractionation. However, apparent differences between Gusev rocks and shergottites in their ages, plagioclase abundances, and volatile contents preclude direct correlation. Orbital determinations of global olivine distribution and compositions by thermal emission spectroscopy suggest that olivine‐rich rocks may be widespread. Because weathering under acidic conditions preferentially attacks olivine and disguises such rocks beneath alteration rinds, picritic basalts formed from primitive magmas may even be a common component of the Martian crust formed during ancient and recent times.
doi_str_mv 10.1029/2005JE002477
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Y. ; Wyatt, M. B ; Gellert, R. ; Bell III, J. F. ; Morris, R. V. ; Herkenhoff, K. E. ; Crumpler, L. S. ; Milam, K. A. ; Stockstill, K. R. ; Tornabene, L. L. ; Arvidson, R. E. ; Bartlett, P. ; Blaney, D. ; Cabrol, N. A. ; Christensen, P. R. ; Clark, B. C. ; Crisp, J. A. ; Des Marais, D. J. ; Economou, T. ; Farmer, J. D. ; Farrand, W. ; Ghosh, A. ; Golombek, M. ; Gorevan, S. ; Greeley, R. ; Hamilton, V. E. ; Johnson, J. R. ; Joliff, B. L. ; Klingelhöfer, G. ; Knudson, A. T. ; McLennan, S. ; Ming, D. ; Moersch, J. E. ; Rieder, R. ; Ruff, S. W. ; Schröder, C. ; de Souza Jr, P. A. ; Squyres, S. W. ; Wänke, H. ; Wang, A. ; Yen, A. ; Zipfel, J.</creator><creatorcontrib>McSween, H. Y. ; Wyatt, M. B ; Gellert, R. ; Bell III, J. F. ; Morris, R. V. ; Herkenhoff, K. E. ; Crumpler, L. S. ; Milam, K. A. ; Stockstill, K. R. ; Tornabene, L. L. ; Arvidson, R. E. ; Bartlett, P. ; Blaney, D. ; Cabrol, N. A. ; Christensen, P. R. ; Clark, B. C. ; Crisp, J. A. ; Des Marais, D. J. ; Economou, T. ; Farmer, J. D. ; Farrand, W. ; Ghosh, A. ; Golombek, M. ; Gorevan, S. ; Greeley, R. ; Hamilton, V. E. ; Johnson, J. R. ; Joliff, B. L. ; Klingelhöfer, G. ; Knudson, A. T. ; McLennan, S. ; Ming, D. ; Moersch, J. E. ; Rieder, R. ; Ruff, S. W. ; Schröder, C. ; de Souza Jr, P. A. ; Squyres, S. W. ; Wänke, H. ; Wang, A. ; Yen, A. ; Zipfel, J.</creatorcontrib><description>Rocks on the floor of Gusev crater are basalts of uniform composition and mineralogy. Olivine, the only mineral to have been identified or inferred from data by all instruments on the Spirit rover, is especially abundant in these rocks. These picritic basalts are similar in many respects to certain Martian meteorites (olivine‐phyric shergottites). The olivine megacrysts in both have intermediate compositions, with modal abundances ranging up to 20–30%. Associated minerals in both include low‐calcium and high‐calcium pyroxenes, plagioclase of intermediate composition, iron‐titanium‐chromium oxides, and phosphate. These rocks also share minor element trends, reflected in their nickel‐magnesium and chromium‐magnesium ratios. Gusev basalts and shergottites appear to have formed from primitive magmas produced by melting an undepleted mantle at depth and erupted without significant fractionation. However, apparent differences between Gusev rocks and shergottites in their ages, plagioclase abundances, and volatile contents preclude direct correlation. Orbital determinations of global olivine distribution and compositions by thermal emission spectroscopy suggest that olivine‐rich rocks may be widespread. 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Y.</creatorcontrib><creatorcontrib>Wyatt, M. B</creatorcontrib><creatorcontrib>Gellert, R.</creatorcontrib><creatorcontrib>Bell III, J. F.</creatorcontrib><creatorcontrib>Morris, R. V.</creatorcontrib><creatorcontrib>Herkenhoff, K. E.</creatorcontrib><creatorcontrib>Crumpler, L. S.</creatorcontrib><creatorcontrib>Milam, K. A.</creatorcontrib><creatorcontrib>Stockstill, K. R.</creatorcontrib><creatorcontrib>Tornabene, L. L.</creatorcontrib><creatorcontrib>Arvidson, R. E.</creatorcontrib><creatorcontrib>Bartlett, P.</creatorcontrib><creatorcontrib>Blaney, D.</creatorcontrib><creatorcontrib>Cabrol, N. A.</creatorcontrib><creatorcontrib>Christensen, P. R.</creatorcontrib><creatorcontrib>Clark, B. C.</creatorcontrib><creatorcontrib>Crisp, J. A.</creatorcontrib><creatorcontrib>Des Marais, D. J.</creatorcontrib><creatorcontrib>Economou, T.</creatorcontrib><creatorcontrib>Farmer, J. 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W.</creatorcontrib><creatorcontrib>Wänke, H.</creatorcontrib><creatorcontrib>Wang, A.</creatorcontrib><creatorcontrib>Yen, A.</creatorcontrib><creatorcontrib>Zipfel, J.</creatorcontrib><title>Characterization and petrologic interpretation of olivine-rich basalts at Gusev Crater, Mars</title><title>Journal of Geophysical Research. E. Planets</title><addtitle>J. Geophys. Res</addtitle><description>Rocks on the floor of Gusev crater are basalts of uniform composition and mineralogy. Olivine, the only mineral to have been identified or inferred from data by all instruments on the Spirit rover, is especially abundant in these rocks. These picritic basalts are similar in many respects to certain Martian meteorites (olivine‐phyric shergottites). The olivine megacrysts in both have intermediate compositions, with modal abundances ranging up to 20–30%. Associated minerals in both include low‐calcium and high‐calcium pyroxenes, plagioclase of intermediate composition, iron‐titanium‐chromium oxides, and phosphate. These rocks also share minor element trends, reflected in their nickel‐magnesium and chromium‐magnesium ratios. Gusev basalts and shergottites appear to have formed from primitive magmas produced by melting an undepleted mantle at depth and erupted without significant fractionation. However, apparent differences between Gusev rocks and shergottites in their ages, plagioclase abundances, and volatile contents preclude direct correlation. Orbital determinations of global olivine distribution and compositions by thermal emission spectroscopy suggest that olivine‐rich rocks may be widespread. Because weathering under acidic conditions preferentially attacks olivine and disguises such rocks beneath alteration rinds, picritic basalts formed from primitive magmas may even be a common component of the Martian crust formed during ancient and recent times.</description><subject>Basalt</subject><subject>Craters</subject><subject>Magma</subject><subject>Mars</subject><subject>Martian meteorites</subject><subject>Minerals</subject><subject>Olivine</subject><subject>Plagioclase</subject><subject>Rocks</subject><subject>Shergottites</subject><issn>0148-0227</issn><issn>2169-9097</issn><issn>2156-2202</issn><issn>2169-9100</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2006</creationdate><recordtype>article</recordtype><recordid>eNqFkUtP3TAQha2qSL0CdvwAryoWpIzH8WvZ3t6GZyshUDeVLCdximlILnYur19PIKhixZ3NLM53jjRzCNlh8IUBmn0EEEcLAMyV-kBmyITMEAE_khmwXGeAqD6R7ZSuYJxcyBzYjPyZX7roqsHH8OiG0HfUdTVd-iH2bf83VDR0o7aMfpjUvqF9G25D57MYqktauuTaIVE30GKV_C2dRzca9uipi2mLbDSuTX77dW-Six-L8_lBdvKrOJx_PcmckEZkCIYrrUohoW5qNd4hsfSAdVUq5llTNQCmluA053UlTc5LL1UtOVdSN0zwTfJ5yl3G_mbl02CvQ6p827rO96tkUTPkmuXrQWU0R5RrQaZyzbh4TtxdA3IAzZhWI7o3oVXsU4q-scsYrl18sAzsc4X2bYUjjhN-F1r_8C5rj4qzBcLLJ7LJFNLg7_-bXPxnpeJK2N8_C2uOzXdTHHyzmj8BI32qCQ</recordid><startdate>20060101</startdate><enddate>20060101</enddate><creator>McSween, H. 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The olivine megacrysts in both have intermediate compositions, with modal abundances ranging up to 20–30%. Associated minerals in both include low‐calcium and high‐calcium pyroxenes, plagioclase of intermediate composition, iron‐titanium‐chromium oxides, and phosphate. These rocks also share minor element trends, reflected in their nickel‐magnesium and chromium‐magnesium ratios. Gusev basalts and shergottites appear to have formed from primitive magmas produced by melting an undepleted mantle at depth and erupted without significant fractionation. However, apparent differences between Gusev rocks and shergottites in their ages, plagioclase abundances, and volatile contents preclude direct correlation. Orbital determinations of global olivine distribution and compositions by thermal emission spectroscopy suggest that olivine‐rich rocks may be widespread. Because weathering under acidic conditions preferentially attacks olivine and disguises such rocks beneath alteration rinds, picritic basalts formed from primitive magmas may even be a common component of the Martian crust formed during ancient and recent times.</abstract><pub>Blackwell Publishing Ltd</pub><doi>10.1029/2005JE002477</doi><tpages>17</tpages><oa>free_for_read</oa></addata></record>
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identifier ISSN: 0148-0227
ispartof Journal of Geophysical Research. E. Planets, 2006-01, Vol.111 (E2), p.n/a
issn 0148-0227
2169-9097
2156-2202
2169-9100
language eng
recordid cdi_proquest_miscellaneous_28123814
source Access via Wiley Online Library; Wiley Free Content; Wiley-Blackwell AGU Digital Library; Alma/SFX Local Collection
subjects Basalt
Craters
Magma
Mars
Martian meteorites
Minerals
Olivine
Plagioclase
Rocks
Shergottites
title Characterization and petrologic interpretation of olivine-rich basalts at Gusev Crater, Mars
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