UMD GEOL 342 - Rapid time series (12 pages)

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Rapid time series



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Rapid time series

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Lecture Notes


Pages:
12
School:
University of Maryland, College Park
Course:
Geol 342 - Sedimentation and Stratigraphy

Unformatted text preview:

Rapid time series 33S profiles of deep time drill cores by EA combustion techniques Alan J Kaufman James Farquhar and David T Johnston Department of Geology University of Maryland Timothy W Lyons Department of Earth Sciences University of California Riverside Gail L Arnold and Ariel Anbar Department of Geological Sciences Arizona State University Deep Time Drilling Project of the NASA Astrobiology Drilling Program EA SO combustion technique O2 purge He Baublys et al 2004 Rapid Commun Mass Spectrom 2004 18 2765 2769 vent EA SO combustion technique AJK Ham 3 24 06 112 52 0 74 100 SIR of 5 Channels EI TIC 2 29e6 2 55 11 AJK Ham 3 24 06 NBS127 R8 0 74 100 SIR of 5 Channels EI TIC 2 29e6 2 54 11 200 400 600 800 1000 1200 1400 1600 1800 2000 2200 2400 2600 2800 3000 3200 peak height on m z 48 up to 2 0 nA peak height on m z 50 saturated at 8E 11 A 100 g NBS 127 barite NZ1 NZ3 interspersed with samples 100 to 5000 g powdered shale Scan EA CF SO drift corrections As elemental Cu in the combustion tube is progressively oxidized there is a correctable drift in the raw sulfur isotope values EA CF SO method drift correction run no 1 2 3 4 5 14 15 26 27 38 39 50 51 62 63 74 75 86 87 98 99 110 111 122 123 33S raw 34S raw 34S corr 13 43 12 24 12 77 12 85 12 87 12 75 12 50 12 68 12 63 12 79 12 40 12 85 12 60 12 72 12 92 12 95 12 91 12 96 12 76 13 08 13 20 13 08 13 05 13 10 12 87 12 84 0 26 25 15 25 09 24 86 25 07 25 37 24 96 25 16 25 26 25 17 25 27 25 21 25 52 25 65 25 72 25 87 26 17 25 93 26 30 26 14 26 17 26 68 26 47 26 35 26 34 26 07 25 68 0 55 25 14 25 06 24 82 25 02 25 31 24 79 24 97 24 94 24 83 24 80 24 72 24 90 25 02 24 95 25 09 25 25 25 00 25 24 25 06 24 96 25 45 25 10 24 97 24 83 24 54 24 99 0 20 wt S raw 22 17 21 39 21 44 21 45 23 42 22 01 21 43 22 79 22 64 22 68 17 77 22 84 21 43 22 37 22 55 22 19 19 26 22 22 21 65 18 89 20 54 20 39 18 80 22 99 19 02 21 37 average 1 54 stdev 1 After drift correction a correction for the interference of 32S18O and 33S17O on 34S16O and for



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