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    Depth-shifting cores incompletely recovered from the upper oceanic crust, IODP Hole 1256D

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    Article (715.5Kb)
    Additional file information. Auxiliary material for this article contains data used and MATLAB scripts in the main article to depth-shift core data to match log data. (10.25Kb)
    Text S1: GRA.dat is a 9-column matrix of GRA density data. (1.546Mb)
    Text S2: LOG.dat is a 2-column matrix of downhole logging data. (247.1Kb)
    Text S3: PIECES.dat is a 7-column matrix. (598.1Kb)
    Text S4: DATA.dat is used as DATA in DATADJUST and is a 6-column matrix. (36.94Kb)
    Text S5: The CORELOGINTEGRATE.m file. (13.39Kb)
    Text S6: The DATADJUST file. (3.373Kb)
    Text S7: The EXAMPLE.m file. (870bytes)
    Text S8: The FINDNEAREST.m file. (618bytes)
    Text S10: The dataset.txt file. (296Kb)
    Text S9: The MATCHPERCENT.m file. (1.435Kb)
    Date
    2008-08-09
    Author
    Gilbert, Lisa A.  Concept link
    Burke, Andrea  Concept link
    Metadata
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    Citable URI
    https://hdl.handle.net/1912/3278
    As published
    https://doi.org/10.1029/2008GC002010
    DOI
    10.1029/2008GC002010
    Keyword
     Ocean drilling; Core-log integration; IODP Site 1256 
    Abstract
    Seafloor drilling operations, especially those in crustal rocks, yield incomplete recovery of drilled sections, and depths of the recovered core pieces are assigned with some uncertainty. Here we present a new depth-shifting method that is simple and rapid, requires little subjective input, and is applicable to any core-log integration problem where sufficient comparable data have been collected in both the open hole and from the recovered core. Over the depth range for which both core and log data have been collected, an automatic algorithm selected the best new depth for each piece. The criteria for determining the best depth were as follows: (1) find new depths for as many pieces as possible, and (2) minimize the difference between core density and log density. In this study, depth-shifting is applied at Integrated Ocean Drilling Program (IODP) Hole 1256D, which is our first opportunity to study a section of intact, in situ upper ocean crust drilled down to gabbro. The new depths significantly improve the agreement between an independent data set and the logging record.
    Description
    Author Posting. © American Geophysical Union, 2008. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geochemistry Geophysics Geosystems 9 (2008): Q08O11, doi:10.1029/2008GC002010.
    Collections
    • Geology and Geophysics (G&G)
    Suggested Citation
    Geochemistry Geophysics Geosystems 9 (2008): Q08O11
     

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