JCVI: In Situ Radiometric and Exposure Age Dating of the Martian Surface.
 
 
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Blake DF, Bristow T, Desmarais D, Edwards L, Haberle R, Hoehler T, Hollingsworth J, Kahre M, Keely L, McKay C, Wilhelm MB, Bleacher L, Brinckerhoff W, Choi D, Dworkin JP, Floyd M, Freissinet C, Garvin J, Glavin D, Harpold D, Martin DK, McAdam A, Raaen E, Smith MD, Stern J, Tan F, Trainer M, Meyer M, Posner A, Voytek M, Anderson RC, Aubrey A, Behar A, Blaney D, Brinza D, Christensen L, Crisp JA, Deflores L, Feldman J, Feldman S, Flesch G, Hurowitz J, Jun I, Keymeulen D, Maki J, Mischna M, Morookian JM, Parker T, Pavri B, Schoppers M, Sengstacken A, Simmonds JJ, Spanovich N, Juarez Mde L, Webster CR, Yen A, Archer PD, Cucinotta F, Jones JH, Morris RV, Niles P, Rampe E, Nolan T, Fisk M, Radziemski L, Barraclough B, Bender S, Berman D, Dobrea EN, Tokar R, Williams RM, Yingst A, Leshin L, Cleghorn T, Huntress W, Manhès G, Hudgins J, Olson T, Stewart N, Sarrazin P, Vicenzi E, Wilson SA, Bullock M, Ehresmann B, Peterson J, Rafkin S, Zeitlin C, Fedosov F, Golovin D, Karpushkina N, Kozyrev A, Litvak M, Malakhov A, Mitrofanov I, Mokrousov M, Nikiforov S, Prokhorov V, Sanin A, Tretyakov V, Varenikov A, Vostrukhin A, Kuzmin R, Clark B, Wolff M, Botta O, Drake D, Bean K, Lemmon M, Anderson RB, Herkenhoff K, Lee EM, Sucharski R, Hernández MÁ, Avalos JJ, Ramos M, Kim MH, Plante I, Muller JP, Ewing R, Boynton W, Downs R, Fitzgibbon M, Harshman K, Morrison S, Kortmann O, Palucis M, Williams A, Lugmair G, Wilson MA, Rubin D, Jakosky B, Balic-Zunic T, Frydenvang J, Jensen JK, Kinch K, Koefoed A, Madsen MB, Stipp SL, Boyd N, Campbell JL, Perrett G, Pradler I, Vanbommel S, Jacob S, Owen T, Rowland S, Savijärvi H, Boehm E, Böttcher S, Burmeister S, Guo J, Köhler J, García CM, Mueller-Mellin R, Bridges JC, McConnochie T, Benna M, Franz H, Bower H, Brunner A, Blau H, Boucher T, Carmosino M, Atreya S, Elliott H, Halleaux D, Rennó N, Wong M, Pepin R, Elliott B, Spray J, Thompson L, Gordon S, Newsom H, Ollila A, Williams J, Bentz J, Nealson K, Popa R, Kah LC, Moersch J, Tate C, Day M, Kocurek G, Hallet B, Sletten R, Francis R, McCullough E, Cloutis E, Ten Kate IL, Fraeman A, Scholes D, Slavney S, Stein T, Ward J, Berger J, Moores JE

In Situ Radiometric and Exposure Age Dating of the Martian Surface.

Science (New York, N.Y.). 2014 Jan 24; 343: 1247166.

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Abstract

We determined radiogenic and cosmogenic noble gases in a mudstone on the floor of Gale Crater. A K-Ar age of 4.21 ± 0.35 billion years represents a mixture of detrital and authigenic components and confirms the expected antiquity of rocks comprising the crater rim. Cosmic-ray-produced (3)He, (21)Ne, and (36)Ar yield concordant surface exposure ages of 78 ± 30 million years. Surface exposure occurred mainly in the present geomorphic setting rather than during primary erosion and transport. Our observations are consistent with mudstone deposition shortly after the Gale impact or possibly in a later event of rapid erosion and deposition. The mudstone remained buried until recent exposure by wind-driven scarp retreat. Sedimentary rocks exposed by this mechanism may thus offer the best potential for organic biomarker preservation against destruction by cosmic radiation.