Site U1417

Jaeger, J.M.; Gulick, S.P.S.; LeVay, L.J.; Asahi, Hirofumi; Bahlburg, Heinrich; Belanger, C.L.; Berbel, G.B.B.; Childress, L.B.; Cowan, E.A.; Drab, L.; Forwick, Matthias; Fukumura, Akemi; Ge, Shulan; Gupta, Sandeep K.; Kioka, Arata; Konno, Susumu; März, Christian; Matsuzaki, Kenji M.; McClymont, Erin L.; Mix, Alan C; Moy, Christopher M.; Müller, Juliane; Nakamura, Atsunori; Ojima, Takanori; Ridgway, Kenneth D.; Ribeiro, Flávia Noronha Dutra; Romero, Oscar E; Slagle, Angela L.; Stoner, J. S.; St‐Onge, Guillaume; Suto, Itsuki; Walczak, Maureen H.; Worthington, L. L.

doi:10.2204/iodp.proc.341.103.2014

Cited by 8 publications

(13 citation statements)

References 78 publications

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“…F35) are associated with the transition to XCB/RCB core collection and likely reflect reduced sediment diameter in the core liner (as discussed in "Gamma ray attenuation bulk density"). The negative bias observed in the loop magnetic susceptibility associated with incompletely filled core liners is consistent with decreases in measured GRA bulk density also driven by the deviation from calibration volume, as observed in "Physical properties" in the "Site U1417" chapter (Jaeger et al, 2014b) (Fig. F35).…”

Section: Magnetic Susceptibilitysupporting

confidence: 80%

“…A large deposit of chaotic seismic facies interpreted as a mass transport deposit (MTD) is found at ~5.8 s two-way traveltime (TWT) (Reece et al, submitted). The top of the MTD forms a reflector that can be mapped to Site U1417, which is dated at ~1 Ma at that site (see "Background and objectives" in the "Site U1417" chapter [Jaeger et al, 2014b]), suggesting that this depocenter may contain an expanded Middle-Late Pleistocene sedimentary sequence.…”

Section: Background and Objectivesmentioning

confidence: 99%

“…Bioturbated and laminated mud are notably absent from this unit. We compared the lithologic characteristics described above with physical properties data collected by the onboard core logging systems but did not encounter consistent associations between natural gamma radiation (NGR) and abs (a*/b*) and the sedimentary components as we did at Site U1417 (see "Lithostratigraphy" in the "Site U1417" chapter [Jaeger et al, 2014b]). We do, however, see some association between the distribution of lithostratigraphic units and changes in magnetic susceptibility where peaks in clast abundance in Unit I are coincident with peaks in magnetic susceptibility, and these associations are described in more detail in "Core-log-seismic integration.…”

Section: Site U1418mentioning

confidence: 99%

“…F35). As outlined in "Physical properties" in the "Site U1417" chapter (Jaeger et al, 2014b), the relatively low apparent WRMSL wet bulk density partially reflects incomplete core recovery associated with the XCB and RCB coring methods, as the width of the recovered sediments fails to completely fill the core liner and the GRA bulk density measurements are therefore calibrated for a larger sediment volume than is actually contained in the XCB and RCB cores.…”

Section: Gamma Ray Attenuation Bulk Densitymentioning

confidence: 99%

“…As outlined in "Physical Properties" in the "Site U1417" chapter (Jaeger et al, 2014b), to facilitate comparison both the point-source and WRMSL loop magnetic susceptibility data sets were smoothed with a Gaussian filter of 10 cm (±3) and then interpolated to constant resolution. Although the relationship between point-source magnetic susceptibility and loop magnetic susceptibility appears to be linear, there is an offset in the overall magnitude of the measurements, with loop magnetic susceptibility being on average 1.58× greater than the point-source measurements in the Site U1418 APC splice (Fig.…”

Section: Magnetic Susceptibilitymentioning

confidence: 99%

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Site U1418

Jaeger¹,

Gulick²,

LeVay³

et al. 2014

Proceedings of the IODP

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Section: Magnetic Susceptibilitysupporting

confidence: 80%

Section: Background and Objectivesmentioning

confidence: 99%

Section: Site U1418mentioning

confidence: 99%

Section: Gamma Ray Attenuation Bulk Densitymentioning

confidence: 99%

Section: Magnetic Susceptibilitymentioning

confidence: 99%

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Site U1418

Jaeger¹,

Gulick²,

LeVay³

et al. 2014

Proceedings of the IODP

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Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 arc min Resolution Version 3 (EMAG2v3)

Meyer

Chulliat

Saltus

2017

Geochem Geophys Geosyst

110

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The Earth Magnetic Anomaly Grid at 2 arc min resolution version 3, EMAG2v3, combines marine and airborne trackline observations, satellite data, and magnetic observatory data to map the location, intensity, and extent of lithospheric magnetic anomalies. EMAG2v3 includes over 50 million new data points added to NCEI's Geophysical Database System (GEODAS) in recent years. The new grid relies only on observed data, and does not utilize a priori geologic structure or ocean‐age information. Comparing this grid to other global magnetic anomaly compilations (e.g., EMAG2 and WDMAM), we can see that the inclusion of a priori ocean‐age patterns forces an artificial linear pattern to the grid; the data‐only approach allows for greater complexity in representing the evolution along oceanic spreading ridges and continental margins. EMAG2v3 also makes use of the satellite‐derived lithospheric field model MF7 in order to accurately represent anomalies with wavelengths greater than 300 km and to create smooth grid merging boundaries. The heterogeneous distribution of errors in the observations used in compiling the EMAG2v3 was explored, and is reported in the final distributed grid. This grid is delivered at both 4 km continuous altitude above WGS84, as well as at sea level for all oceanic and coastal regions.

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The provenance signal of climate–tectonic interactions in the evolving St. Elias orogen: framework component analysis and pyroxene and epidote single grain geochemistry of sediments from IODP 341 sites U1417 and U1418

Huber

Bahlburg

2021

Int J Earth Sci (Geol Rundsch)

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The St. Elias orogen and the Surveyor Fan in the adjacent Gulf of Alaska are a coupled source to sink system recording the interplay of tectonics and variable degrees of glaciation during the collision of the Yakutat terrane with the southern Alaska margin since the Miocene. The Miocene to Holocene sediments of the Surveyor Fan were drilled during IODP expedition 341. The recovered material is used to constrain information on changes in erosion centers during the last 10 Ma to study the impact of climatic and tectonic processes on orogen evolution. Point counting of sand- and silt-sized light framework components and geochemical single grain analysis of heavy mineral groups epidote and pyroxene is applied to analyze patterns of sedimentary provenance of two sites on the distal and proximal Surveyor Fan (Site U1417 and U1418, respectively). The studied sands and silts of Miocene to Pleistocene age are slightly enriched in feldspar (plag >> kf) at the proximal site, compositions at both sites do not show systematical changes with time of deposition. Framework component spectra uniformly reflect the expected active margin provenance. Epidote and pyroxene compositions are very consistent and show no change with time of deposition. Associations of epidote and pyroxene with albite, titanite and pumpellyite are in line with near-shore sources in the Chugach Metamorphic Complex and the metabasite belt at its southern border, and in units of recycled detritus exposed in the fold and thrust belt on the western Yakutat Terrane, respectively. Rock fragments indicate input from mainly metamorphic sources during the Miocene and Pliocene and an increase of input from low-grade metamorphic and sedimentary rocks in the Pleistocene, a finding also indicated by the abundance of epidote and pyroxene. This implies increasing erosion of the near-shore areas of the fold and thrust belt with advance of glaciers to the shore since the Miocene, being enhanced by the onset of the Northern Hemisphere glaciation at the beginning of the Pleistocene. Climate changes connected to the mid-Pleistocene transition did not result in appreciable changes in the petrographic compositions. Glaciers seem to have remained nested in their topographically predefined positions, continuously feeding material with uniform characteristics into the fan.

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Site U1417

Cited by 8 publications

References 78 publications

Site U1418

Site U1418

Derivation and Error Analysis of the Earth Magnetic Anomaly Grid at 2 arc min Resolution Version 3 (EMAG2v3)

The provenance signal of climate–tectonic interactions in the evolving St. Elias orogen: framework component analysis and pyroxene and epidote single grain geochemistry of sediments from IODP 341 sites U1417 and U1418

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