Site U1452

France‐Lanord, Christian; Spieß, V.; Klauss, Adam; Adhikari, R.R.; Adhikari, S.K.; Bahk, Jang-Jun; Baxter, A.T.; Cruz, J.W.; Das, S.K.; Dekens, P. S.; Duleba, Wânia; Fox, L.R.; Galy, Αlbert; Ge, Jun; Gleason, James D.; Gyawali, B.R.; Huyghe, Pascale; Jia, Guodong; Lantzsch, Hendrik; Manoj, M.C.; Martin, Y. Martos; Meynadier, L.; Najman, Yani; Nakajima, A.; Ponton, C.; Reilly, Brendan; Rogers, K.G.; Savian, J.F.; Schwenk, T.; Selkin, P.A.; Weber, Michael E; Williams, T.; Yoshida, Kohki

doi:10.14379/iodp.proc.354.106.2016

Cited by 8 publications

(4 citation statements)

References 27 publications

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“…The ash layer falls off the main trend defined by lithologies in the two measured core sections, which shows a relatively simple binary mixing trend (Figure F14). This mixing relationship is consistent with parallel observations at Sites U1451 and U1452 for mixing between a marine biogenic carbonate end-member and a terrigenous silicate component with a higher Sr/Ca ratio (see Geochemistry and microbiology in the Site U1451 chapter and Geo-chemistry and microbiology in the Site U1452 chapter [France-Lanord et al, 2016b, 2016c). Section 31F-2 (155.6-156.9 m CSF-A) was also scanned at high resolution by spot XRF and contains a reversed to normal to reversed transition identified by paleomagnetic stratigraphy as the Jaramillo Subchron (0.988-1.072 Ma; see Paleomagnetism).…”

Section: X-ray Fluorescence Resultssupporting

confidence: 89%

Site U1453

France‐Lanord¹,

Spieß²,

Klauss³

et al. 2016

Proceedings of the International Ocean Discovery Program

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Contents 1 Site summary 3 Background and objectives 4 Operations 6 Lithostratigraphy 10 Biostratigraphy 11 Paleomagnetism 14 Geochemistry and microbiology 17 Physical properties 21 Downhole measurements 26 Stratigraphic synthesis 30 References Site summarySite U1453 (proposed Site MBF-4A) is in the center of our seven-site transect of shallow-penetration holes. It is located at 8°0.42′N, 86°47.90′E in a water depth of 3690.5 m. Combined with the other transect sites, Site U1453 will document depocenter migration and quantify overall sediment delivery to 8°N since the Pleistocene.Site U1453 is located ~1 km south and ~5 km east of a prominent surficial channel. The channel exhibits pronounced meandering point bars and internal terraces. Sediment transported by this channel has therefore significantly influenced deposition at this site during the channel's lifetime. A prominent buried point bar is located <1 km west of the site. The overall seismic reflectivity at the drill site is relatively high, indicating coarse material throughout most of the drilled section, except for the lower portion of the drill hole. Distinct and variable local spillover deposits were expected at the site in response to the channel and meander evolution. Toward the base of the hole, lower seismic reflectivity and distinct layering is inferred to reflect hemipelagic or distal levee deposition.In addition to coring, downhole logging was introduced as an important objective of Site U1453 after attempts to log at Sites U1450 and U1451 were unsuccessful. Logging data are essential for determining the inventory of lithofacies and structures in the fan given the limitations in completely recovering unconsolidated coarse material and the importance of measuring in situ physical properties and imaging fine-scale sedimentary structures. Therefore, we decided to log Hole U1453A despite its shallow ~215 m penetration to increase chances that we could acquire this critical in situ log data. This was particularly important for characterizing the in situ properties of thick sandy intervals that half-length advanced piston corer (HLAPC) cores returned as loose and liquefied sand. Principal resultsSite U1453 contributes to the overall seven-site transect drilled during Expedition 354. When integrated with the seismic profile and refined chronostratigraphic data from the remaining part of the transect, this site will document fan construction processes and the depocenter migration time frame. Specifically, Site U1453 provides an almost completely recovered succession of silt-and/or sanddominated sheeted units related to the formation and evolution of a large meandering channel system lacking a distinct levee unit. Intercalation of these sheets with thinner levee units either from the large channel or from nearby smaller channels may help us understand why the channel has been apparently maintained in this position for a relatively long time period. This type of configuration is part of the different processes that influence interlevee deposition. A few th...

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Section: X-ray Fluorescence Resultssupporting

confidence: 89%

Site U1453

France‐Lanord¹,

Spieß²,

Klauss³

et al. 2016

Proceedings of the International Ocean Discovery Program

Self Cite

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“…In most cases, lithologic names assigned using this protocol match well with measured carbonate content and accurately reflect the continuum of sediments recovered at this site. Examples can be seen in Figure F6 in the Site U1451 chapter (France-Lanord et al, 2016b) and Figure F5 in the Site U1452 chapter (France-Lanord et al, 2016c Drilling disturbances at this site vary in intensity from slight to high and include flow-in, fractures, up-arching, "soupy" textures, and drilling biscuits. Flow-in is the most common drilling disturbance in fine-grained intervals, whereas disturbed sands may display a homogeneous (or soupy) texture.…”

Section: Lithostratigraphic Summarymentioning

confidence: 99%

Site U1450

France‐Lanord¹,

Spieß²,

Klaus³

et al. 2016

Proceedings of the International Ocean Discovery Program

Self Cite

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Section: Lithostratigraphic Summarymentioning

confidence: 99%

Site U1454

France‐Lanord¹,

Spieß²,

Klauss³

et al. 2016

Proceedings of the International Ocean Discovery Program

Self Cite

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Background and objectives 4 Operations 6 Lithostratigraphy 12 Biostratigraphy 13 Paleomagnetism 15 Geochemistry and microbiology 18 Physical properties 22 Downhole measurements 22 Stratigraphic synthesis 26 References Hole U1454A Hole U1454B Latitude: 8°0.4067′N Latitude: 8°0.4083′N Longitude: 85°50.9882′E Longitude: 85°51.0025′E Time on hole (days): 0.4 (9.00 h) Time on hole (days): 1.6 (37.5 h) Seafloor (drill pipe measurement below rig floor, m DRF): 3721.0 Seafloor (drill pipe measurement below rig floor, m DRF): 3721.4 Distance between rig floor and sea level (m): 11.1 Distance between rig floor and sea level (m): 11.1 Water depth (drill pipe measurement from sea level, mbsl): 3709.9 Water depth (drill pipe measurement from sea level, mbsl): 3710.3 Total penetration (drilling depth below seafloor, m DSF): 7.5 Total penetration (drilling depth below seafloor, m DSF): 161.8 Total depth (drill pipe measurement from rig floor, m DRF): 3728.5 Total depth (drill pipe measurement from rig floor, m DRF): 3883.2 Total length of cored section (m): 7.5 Total length of cored section (m): 147.4 Total core recovered (m): 7.54 Total core recovered (m): 129.51 Core recovery (%): 101 Core recovery (%): 88 Drilled interval (m): 0.0 Drilled interval (m): 14.4 Total number of cores: 1 Total number of cores: 29 Hole U1454C Hole U1453D Latitude: 8°0.3868′N Latitude: 8°0.3975′N Longitude: 85°51.0033′E Longitude: 85°5.9927′E Time on hole (days): 0.3 (8 h) Time on hole (days): 0.6 (14.00 h) Seafloor (drill pipe measurement below rig floor, m DRF): 3721.4 Seafloor (drill pipe measurement below rig floor, m DRF): 3721.8 Distance between rig floor and sea level (m): 11.1 Distance between rig floor and sea level (m): 11.1 Water depth (drill pipe measurement from sea level, mbsl): 3710.3 Water depth (drill pipe measurement from sea level, mbsl): 3710.7 Total penetration (drilling depth below seafloor, m DSF): 37.2 Total penetration (drilling depth below seafloor, m DSF): 37.1 Total depth (drill pipe measurement from rig floor, m DRF): 3758.6 Total depth (drill pipe measurement from rig floor, m DRF): 3758.9 Total length of cored section (m): 37.2 Total length of cored section (m): 37.1 Total core recovered (m): 30.16 Total core recovered (m): 24.46 Core recovery (%): 81 Core recovery (%): 66 Drilled interval (m): 0.0 Drilled interval (m): 0.0 Total number of cores: 6 Total number of cores: 5

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Site U1452

Cited by 8 publications

References 27 publications

Site U1453

Site U1453

Site U1450

Site U1454

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