georefid:2007-124230SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.2973/odp.proc.sr.206.009.20072007-01-01publicationgeorefid:2007-124230doi:10.2973/odp.proc.sr.206.009.2007Ziegler, C. L.Boston University, Department of Earth Sciences, Boston, MA, United StatesauthorMurray, R. W.University of California, Santa Barbara, United StatesauthorTexas A&M University, Ocean Drilling Program, College Station, TX, United StatespublisherdocumentDigitalIn: Teagle, Damon A. H., Wilson, Douglas S., Acton, Gary D., Alt, Jeffrey C., Banerjee, Neil R., Barr, Samantha R., Coggon, Rosalind, Cooper, Kari M., Crispini, Laura, Einaudi, Florence, Jiang, Shijun, Kalberkamp, Ulrich, Kerneklian, Marcie J., Laverne, Christine, Nichols, Holly J., Sandwell, Rachel, Tartarotti, Paola, Umino, Susumu, Ziegler, Christa, Proceedings of the Ocean Drilling Program; volume 206; scientific results; an in situ section of the upper oceanic crust formed by superfast seafloor spreading; covering Leg 206 of the cruises of the drilling vessel JOIDES Resolution; Balboa, Panama to Balboa, Panama; Site 1256; 6 November 2002-4 January 2003206We measured the chemical composition of 100 samples from the 250-m sediment sequence retrieved from Ocean Drilling Program Site 1256 in the Guatemala Basin using a newly developed microwave-assisted acid digestion protocol followed by inductively coupled plasma-atomic emission spectroscopy (ICP-AES) analysis. We compared these data gathered onshore to the results from the flux fusion prepared samples analyzed by shipboard ICP-AES during the leg and published in the Leg 206 Initial Reports volume, as well as to 35 randomly selected samples that were prepared by flux fusion at Boston University and analyzed by ICP-AES. Comparison of the newly developed acid digestion protocol to shore-based flux fusion demonstrates that the microwave-assisted acid technique yields a complete digestion, and because this procedure includes boric acid, it is safe for use with HF acid as boric acid neutralizes excess HF. The precision for nearly all elements in shorebased acid digestions is better than 3% of the measured values, including for elements such as Ni, Cr, and V, which are typically difficult to measure in biogenic-rich sediments. The shore-based flux fusions, while better than shipboard reported precision values (as expected), has precision better than 3% of their respective measured values for all major elements (Si, Al, Ti, Fe, Mn, Ca, Mg, Na, and K) and several trace elements (Ba and Sr). Results for P, Cr, Ni, V, Sc, and Zr are better than 5% of their measured values. Not only does the newly developed acid digestion provide better analytical results than the typical flux fusion method, the shore-based acid procedure also exhibits downhole lithologic and chemical characteristics similar to the shipboard flux fusion prepared results. These results confirm that the current shipboard methods are adequate for first-order geochemical interpretations and that the microwave- assisted acid digestion holds great potential to be the primary technique of preparing sediments on future Integrated Ocean Drilling Program expeditions.completedGeochemistry of rocks, soils, and sedimentsaccuracyacid digestion methodchemical analysischemical compositionconcentrationEast PacificEast Pacific RiseEquatorial Pacificflux fusion methodgeochemistryGuatemala Basininductively coupled plasma methodsinterlaboratory comparisonLeg 206major elementsmarine sedimentsmeasurementnew methodsNorth PacificNortheast PacificOcean Drilling ProgramODP Site 1256Pacific Oceanplasma emission spectroscopyprecisionquality controlregression analysissample preparationsedimentsspectroscopystatistical analysistrace elementsurn:org.iodp:exp:206urnlargerWorkCitationcampaignurn:org.iodp:exp:206:site:1256urnlargerWorkCitationstudyurn:org.iodp:exp:206urnlargerWorkCitationcampaignEnglishgeoscientificInformation-91.5600-91.56006.44006.4400application/pdfunknownSEDIS Publication Catalogue

ana.macario@awi.de

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