J. C. Bridges

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Introduction: Mineralogical studies have demonstrated that the nakhlite SNC meteorites have preserved the effects of water-rock interaction between a hydrothermal brine and the nakhlite parent rocks on Mars. Brittle fracturing and corrosion of olivine grains and mesostasis associated with the hydrothermal event have left veins of zoned Fe-carbonate,(More)
[1] This paper describes selection and characterization of the landing site for the Mars 2004 Beagle 2 mission. The site is within Isidis Planitia between 10 –12 N, 266 – 274 W, centered at 11.6 N, 269.5 W. This is at low elevation ( 3600 to 3900 m MOLA), is flat (MOLA RMS slope = 0.57 ), radar data suggest a smoother surface at decimeter to meter scales(More)
Understanding of the geologic evolution of Mars has been greatly improved by recent orbital1–3, in situ4,5 and meteorite6–8 data, but insights into the earliest period of Martian magmatism (4.1 to 3.7 billion years ago) remain scarce9. The landing site of NASA’s Curiosity rover, Gale crater, which formed 3.61 billion years ago10within older terrain11,(More)
1123. [6] Krumbein, W.C. and Pettijohn, F.J. (1966) Manual of Sedimentary Petrography. [7] Greeley, R. et al. (1976) GRL, 3, 8, 417-418. [8] Greeley, R. et al. (1980) GRL, 7, 2, 121124. [9] Iversen, J.D., and White, B.R. (1982) Sedimentology, 29, 1, 111-119. [10] Bunte, K. and Abt, S.R. (2001) US Dept. Agric. Tech. Report RMRS-GTR-74, 428 pp. [11] Chow,(More)
Edwards, R. Anderson, M. D. Dyar, M. Fisk, L. Thompson, P. Gasda, S. P. Schwenzer, W. Goetz, D. Blaney, J. Filiberto, R. C. Wiens, Space Research Centre, University of Leicester UK j.bridges@le.ac.uk USGS Astrogeology Science Center, Flagstaff, AZ, Mt. Holyoke College, Ma, Oregon State Univ., Planetary and Space Science Centre, University of New Brunswick,(More)
The Curiosity rover has analyzed abundant light-toned fracture-fill material within the Yellowknife Bay sedimentary deposits. The ChemCam instrument, coupled with Mastcam and ChemCam/Remote Micro Imager images, was able to demonstrate that these fracture fills consist of calcium sulfate veins, many of which appear to be hydrated at a level expected for(More)
M. E. Schmidt, J. L. Campbell, R. Gellert, G. M. Perrett, A. H. Treiman, D. L. Blaney, A. Olilla, F. J. Calef III, L. Edgar, B. E. Elliott, J. Grotzinger, J. Hurowitz, P. L. King, M. E. Minitti, V. Sautter, K. Stack, J. A. Berger, J. C. Bridges, B. L. Ehlmann, O. Forni, L. A. Leshin, K. W. Lewis, S. M. McLennan, D. W. Ming, H. Newsom, I. Pradler, S. W.(More)
Here we describe the critical role that synchrotron X-ray and infrared microprobes are playing in the search for interstellar dust in the Stardust Interstellar Dust Collector (SIDC). The samples under examination are submicron particles trapped in low-density aerogel. We have found that the spatial resolution, energy range, and flux capabilities of the FTIR(More)
[1] Textural and compositional analyses using Chemistry Camera (ChemCam) remote microimager and laser-induced breakdown spectroscopy (LIBS) have been performed on five float rocks and coarse gravels along the first 100 m of the Curiosity traverse at Bradbury Rise. ChemCam, the first LIBS instrument sent to another planet, offers the opportunity to assess(More)
[1] We have assessed the characteristics of clasts along Curiosity’s traverse to shed light on the processes important in the genesis, modification, and transportation of surface materials. Pebbleto cobble-sized clasts at Bradbury Landing, and subsequently along Curiosity’s traverse to Yellowknife Bay, reflect a mixing of two end-member transport(More)