Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/26700
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Diverse Lithologies and Alteration Events on the Rim of Noachian-Aged Endeavour Crater, Meridiani Planum, Mars: In-Situ Compositional Evidence
Author(s): Mittlefehldt, David
Gellert, Ralf
VanBommel, Scott
Ming, Douglas
Yen, Albert
Clark, Benton C
Morris, Richard
Schröder, Christian
Crumpler, Larry S
Grant, John A
Jolliff, Bradley L
Arvidson, Raymond E
Farrand, William H
Herkenhoff, Kenneth E
Bell, James
Cohen, Barbara
Klingelhöfer, Göstar
Schrader, Christian
Rice, James
Contact Email: christian.schroeder@stir.ac.uk
Keywords: Mars Exploration Rover
Endeavour Crater
geochemistry
impact breccia
Mars alteration
Issue Date: 31-May-2018
Citation: Mittlefehldt D, Gellert R, VanBommel S, Ming D, Yen A, Clark BC, Morris R, Schröder C, Crumpler LS, Grant JA, Jolliff BL, Arvidson RE, Farrand WH, Herkenhoff KE, Bell J, Cohen B, Klingelhöfer G, Schrader C & Rice J (2018) Diverse Lithologies and Alteration Events on the Rim of Noachian-Aged Endeavour Crater, Meridiani Planum, Mars: In-Situ Compositional Evidence, Journal of Geophysical Research: Planets, 123 (5), pp. 1255-1306. https://doi.org/10.1002/2017JE005474.
Continued geochemical investigation of Noachian crust at Endeavour Crater with Mars Exploration Rover Opportunity
ST/R001278/1
Abstract: We report the results of geological studies by the Opportunity Mars rover on the Endeavour Crater rim. Four major units occur in the region (oldest to youngest): the Matijevic, Shoemaker, Grasberg and Burns formations. The Matijevic formation, consisting of fine-grained clastic sediments, is the only pre-Endeavour-impact unit and might be part of the Noachian etched units of Meridiani Planum. The Shoemaker formation is a heterogeneous polymict impact breccia; its lowermost member incorporates material eroded from the underlying Matijevic formation. The Shoemaker formation is a close analog to the Bunte Breccia of the Ries Crater, although the average clast sizes are substantially larger in the latter. The Grasberg formation is a 46 thin, fine-grained, homogeneous sediment unconformably overlying the Shoemaker formation, and likely formed as an airfall deposit of unknown areal extent. The Burns formation sandstone overlies the Grasberg, but compositions of the two units are distinct; there is no evidence that the Grasberg formation is a fine-grained subfacies of the Burns formation. The rocks along the Endeavour Crater rim were affected by at least four episodes of alteration in the Noachian and Early Hesperian: (i) vein formation and alteration of pre-impact Matijevic formation rocks; (ii) low-water/rock alteration along the disconformity between the Matijevic and Shoemaker formations; (iii) alteration of the Shoemaker formation along fracture zones; and (iv) differential mobilization of Fe and Mn, and CaSO4-vein formation in the Grasberg and Shoemaker formations. Episodes (ii) and (iii) possibly occurred together, but (i) and (iv) are distinct from either of these.
DOI Link: 10.1002/2017JE005474
Rights: This item has been embargoed for a period. During the embargo please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. This is the peer reviewed version of the following article: Mittlefehldt, D. W., Gellert, R., vanBommel, S., Ming, D. W., Yen, A. S., Clark, B. C., et al. (2018). Diverse lithologies and alteration events on the rim of Noachian‐aged Endeavour crater, Meridiani Planum, Mars: In situ compositional evidence. Journal of Geophysical Research: Planets, 123, 1255–1306, which has been published in final form at https://doi.org/10.1002/2017JE005474. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.

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