Site U1450

France‐Lanord, Christian; Spieß, V.; Klaus, A.; 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, C.; Martin, Y. Martos; Meynadier, L.; Najman, Yani; Nakajima, A.; Ponton, C.; Reilly, Brendan; Rogers, G.; Savian, J.F.; Schwenk, T.; Selkin, P.A.; Weber, Michael E; Williams, T.; Yoshida, Kohki

doi:10.14379/iodp.proc.354.104.2016

Cited by 7 publications

(2 citation statements)

References 41 publications

(52 reference statements)

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“…The computed age model with its uncertainties is presented in Figure F1 and Table T4. All solutions respect the constraints given by our new calcareous nannofossil datums (Table T1) and the published biostratigraphic datums (Table T2; France-Lanord et al, 2016b;Blum et al, 2018). Two-sigma uncertainties vary between ±0.2 and 0.4 Ma depending on the configuration of age and lithologic constraints.…”

Section: Age Modelsupporting

confidence: 62%

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Data report: calcareous nannofossils and lithologic constraints on the age model of IODP Site U1450, Expedition 354, Bengal Fan

Lenard¹,

Cruz²,

France‐Lanord³

et al. 2020

Proceedings of the International Ocean Discovery Program

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Section: Age Modelsupporting

confidence: 62%

“…More than 400 m of sand-rich turbidites were deposited over a period of less than 3 My. This corresponds to an average accumulation rate of 15 cm/ky over this period (France-Lanord et al, 2016b). Based on new biostratigraphic data, Blum et al (2018) reported even higher accumu-…”

Section: Introductionmentioning

confidence: 83%

Data report: calcareous nannofossils and lithologic constraints on the age model of IODP Site U1450, Expedition 354, Bengal Fan

Lenard¹,

Cruz²,

France‐Lanord³

et al. 2020

Proceedings of the International Ocean Discovery Program

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Expedition 354 methods

France‐Lanord¹,

Spieß²,

Klaus³

et al. 2016

Proceedings of the International Ocean Discovery Program

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Site U1455

France‐Lanord¹,

Spieß²,

Klaus³

et al. 2016

Proceedings of the International Ocean Discovery Program

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Contents 1 Site summary 3 Background and objectives 3 Operations 7 Lithostratigraphy 16 Biostratigraphy 17 Paleomagnetism 20 Geochemistry and microbiology 23 Physical properties 27 Downhole measurements 28 Stratigraphic synthesis 33 References C. France-Lanord et al. Site U1455 IODP Proceedings 2 V o l u m e 3 5 4study Himalayan erosion was found, although it was not recovered at Site U1451 for the same period. In this particular depth interval, further detailed sedimentary analyses may shed light on the causes for the depositional facies being different from Pliocene and Pleistocene times and may help to determine whether the absence of levees originated from a change in sediment supply or transport pathways or from other factors. OperationsWe cored three holes at Site U1455. Holes U1455A and U1455B each consist of a single mudline core; the cores penetrated to 0.9 and 6.9 m DSF, respectively. Hole U1455C consists of coring in three intervals: 0-122.3 m DSF (advanced piston corer [APC] and half-length APC [HLAPC] systems), 359.8-431.4 m DSF (HLAPC system), and 773.0-949.0 m DSF (RCB system). The uppermost interval of Hole U1455C consists of APC and HLAPC coring and four 4.8 m advances without coring (19.2 m). Cores 1H-24F penetrated 103.1 m in this interval and recovered 89.82 m of sediment (87%). We drilled 237.5 m without coring from 122.3 to 359.8 m DSF and then resumed continuous HLAPC coring. Cores 26F-41F penetrated from 359.8 to 431.4 m DSF (71.6 m) and recovered 48.82 m of sediment (68%). After dropping a free-fall funnel (FFF) and retrieving the drill string to switch to the RCB system, we reentered Hole U1455C and drilled ahead without coring from 431.4 to 773.0 m DSF. We RCB cored from that depth to 949.0 m DSF. Cores 43R-60R penetrated 176.0 m and recovered 59.36 m of sediment (34%). Coring ended on 28 March 2015 at 1435 h when the operational time for the expedition expired. LithostratigraphyAs at other Expedition 354 sites, lithologic differences between units and variations in grain size and bed thickness reflect cycles of proximal turbidity current channel activity and abandonment. Sand intervals may represent interlevee "sheet flows" (e.g., Curray et al., 2003), whereas finer grained fractions are more likely preserved in leveed sections. Calcareous clay units reflect cessation of proximal channel activity, but the intervals also resemble episodes of minor increase in siliclastic deposition.Coring in Hole U1455C was divided into three segments. The uppermost segment (from the seabed to 120.51 m core depth below seafloor [CSF-A]) is principally composed of micaceous quartz-rich siliciclastic sediments, many containing typical characteristics of turbidites (sharp base, normal grading, and laminations). In this segment, the lower sand units are overlain by 13.5 m of calcareous clay covered by a 45.86 m thick section of sand and mud turbidites. There are two glassy volcanic ash layers at 5.68-5.75 and 82.80-82.89 m CSF-A. The second recovered segment of Hole U1455C (359.80-431.39 m CSF-A) is also pr...

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Site U1450

Cited by 7 publications

References 41 publications

Data report: calcareous nannofossils and lithologic constraints on the age model of IODP Site U1450, Expedition 354, Bengal Fan

Data report: calcareous nannofossils and lithologic constraints on the age model of IODP Site U1450, Expedition 354, Bengal Fan

Expedition 354 methods

Site U1455

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