Site U1406

Data report: revised composite depth scale and splice for IODP Site U1406

“…XRF elemental counts were generated using an Avaatech XRF Core Scanner at the Gulf Coast Repository (Texas, USA), equipped with an Oxford Instruments 100W Neptune Rh X-ray tube and a Canberra X-PIPS detector. The X-ray tube was run at 10 kV and 1000 µA, the measurement area was set with a cross-core slit of 10 mm and a downcore slit of 12 mm, and measurements were taken at 2 cm intervals with a live counting time of 20 s. For some intervals where XRF data alone do not yield satisfactory correlations, we correlated intervals using physical properties data (i.e., magnetic susceptibility, GRA, NGR, and color reflectance; see the "Site U1406" chapter [Norris et al, 2014c] The composite depth scale, core composite depth below seafloor (CCSF; equivalent to meters composite depth in ODP nomenclature), is defined by adding offsets to the CSF-A depths of cores to align correlative features in cores from multiple holes, simultaneously eliminating overlaps and filling in core gaps. We named the composite depth scale CCSF-A to emphasize that the CCSF depth scale is the composite version of the CSF-A scale.…”

“…The core depth shifts that define the CCSF-A scale are based on one correlative feature between any two cores; this depth scale does not involve stretching and squeezing because it is an affine transformation. Here, we revise the shipboard offsets given to cores in the "Site U1406" chapter (Norris et al, 2014c) and present a revised CCSF-A depth scale for Site U1406. In cases where no correlation tie points could be established, we shifted the tops of cores 1 m below the bottom of the previous core, instead of the +0.01 m used for the shipboard splice (see the "Site U1406" chapter [Norris et al, 2014c]).…”

“…The modest variability of the physical properties data (i.e., magnetic susceptibility, gamma ray attenuation [GRA], and natural gamma radiation [NGR]) from the clay-rich drift sediments at Site U1406 challenged the construction of a reliable shipboard splice (see the "Site U1406" chapter [Norris et al, 2014c]). Postexpedition high-resolution X-ray fluorescence (XRF) core scanning, however, has made it possible to construct a decimeter-scale composite depth scale and near-continuous spliced record.…”

Data report: relative abundance of benthic foraminiferal morphotypes across the Eocene/Oligocene and Oligocene/Miocene boundaries (IODP Expedition 342 Site U1406|North Atlantic)

“…XRF scans of Fe at 10 kV were used to generate a revised spliced depth scale (meters composite depth [mcd]) for Sites U1408 and U1409 that we use here (see 342_REV_SPLICE in SPLICE in "Supplementary material"). For Sites U1406 and U1411, we use the shipboard splices (see 342_SPLICE in SPLICE in "Supplementary material") and the corresponding site reports (see the "Site U1406" and "Site U1411" chapters [Norris et al, 2014b. The splice from Site U1408 is still under revision and is being considered with a direct comparison with Site U1410, particularly for Magnetochrons C18, C19, and C20r.…”

“…IODP | Volume 342composite depth below seafloor, or CCSF, in other Expedition 342 publications), and shipboard bioand magnetostrat-derived age models for every sample. Sample IDs for all shipboard stratigraphic tie points were obtained from the relevant site reports (see the "Site U1406," "Site U1408," "Site U1409," and "Site U1411" chapters [Norris et al, 2014b[Norris et al, , 2014c[Norris et al, , 2014d). Several inconsistencies in the meters below seafloor assignments in the shipboard reports were identified by P. Blum on review, so we updated all assignments for the sample IDs of the stratigraphic tie points using the Laboratory Information Management System (LIMS) Report system (http://web.iodp.tamu.edu/LORE/).…”