Methods

Tada, Ryuji; Murray, R. W.; Zarikian, C.A. Alvarez; Anderson, William T.; Bassetti, Maria Angela; Brace, B.J.; Clemens, S.C.; Gurgel, M.H. da Costa; Dickens, G. R.; Dunlea, Ann G.; Gallagher, S.J.; Giosan, Liviu; Henderson, A.C.G.; Holbourn, Ann; Ikehara, Ken; Irino, Tomohisa; Itaki, Takuya; Karasuda, Akinori; Kinsley, Christopher W.; Kubota, Yoshimi; Lee, G.S.; Lee, K.E.; Lofi, Johanna; Lopes, C.I.C.D.; Peterson, L.C.; Saavedra‐Pellitero, Mariem; Sagawa, Takuya; Singh, Raj K.; Sugisaki, Saiko; Toucanne, Samuel; Wan, Sui; Xuan, Chuang; Zheng, Hairong; Ziegler, Martin

doi:10.2204/iodp.proc.346.102.2015

Cited by 23 publications

(46 citation statements)

References 134 publications

(131 reference statements)

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“…A complete splice was generated from the mudline to ~259 m CSF-A between Holes U1430A and U1430B. A CCSF-C (as defined in the "Methods" chapter [Tada et al, 2015]) depth scale was generated for Hole U1430C, with the exception of Cores 346-U1430C-4H and 5H because they contained slump features. Depth-age analysis indicates a basal age of ~15 Ma for Site U1430, with sedimentation rates ranging from 2 m/m.y., associated with a glauconite-bearing condensed section, to 44 m/m.y., associated with more detrital-and siliceous-rich intervals (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…That achievement was also the deepest continuously recovered piston cored sequence, initiated at the mudline and penetrating ~500 m solely by piston coring. These technological advances delivered a series of "new surprises" (e.g., pristine darklight laminae from ~12 Ma sediment recovered by piston coring from 410 m core depth below seafloor, Method A (CSF-A) (see the "Methods" chapter [Tada et al, 2015]) at IODP Site U1425 and from ~220 to 235 m CSF-A at IODP Site U1430 (Fig. F3) that will stimulate new scientific inquiry into climate dynamics during a time frame and with a high fidelity that could have only been imagined by scientists even a short time ago.…”

Section: Preliminary Scientific Assessmentmentioning

confidence: 99%

“…Splicing among these holes enabled us to construct a continuous stratigraphic sequence, with the exception of two gaps at ~85 and ~115 m CCSF-D (core composite depth, as defined in the "Methods" chapter [Tada et al, 2015]), from the seafloor to the bottom of Core 346-U1422C-18H (144.1 m CSF-A). From that depth downhole, only sediment from Hole U1422C was recovered.…”

Section: Site Summaries Site U1422mentioning

confidence: 99%

“…The Brunhes-Matuyama transition (0.781 Ma) was found at 54 m CSF-A in Hole U1423A and 52 m CSF-A in Hole U1423B, whereas the Matuyama/Gauss boundary (2.581 Ma) was found at 113 m CSF-A in Hole U1423A and at 112 m CSF-A in Hole U1423B. Downhole measurements were made in Hole U1423B to 251 m WSF (wireline depth, as defined in the "Methods" chapter [Tada et al, 2015]). FMS images were of excellent quality because of the good borehole conditions and sea state during logging operations (Fig.…”

Section: Proc Iodp | Volume 346mentioning

confidence: 99%

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Expedition 346 summary

Tada¹,

Murray²,

Zarikian³

et al. 2015

Proceedings of the IODP

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Integrated Ocean Drilling Program (IODP) Expedition 346 (29 July-27 September 2013) drilled seven sites covering a wide latitudinal range in the body of water bordered by the Eurasian continent, the Korean Peninsula, and the Japanese Islands, as well as two closely spaced sites in the East China Sea. This expedition recovered 6135.3 m of core with an average recovery of 101%-a record amount of core recovered during any single IODP expedition. Expedition 346 was the first scientific drilling expedition ever to focus exclusively on the climate system in this region, which is at once so critical yet potentially vulnerable to the challenges society faces in the coming years of global climate change. With the East Asian Monsoon directly affecting the water supply of one-third of the global population, the expedition scientific results and postexpedition research that will follow have direct bearing on society's understanding of this complex atmosphereocean climate system. The high quality of materials recovered and the complete documentation of their geological, geochemical, and geophysical context will lead to an unparalleled series of future studies by the expedition Science Party as well as many other scientists over the coming decades. Cores obtained during this expedition will be used to test the hypothesis that Pliocene-Pleistocene uplift of the Himalaya and Tibetan Plateau, and the consequent emergence of the two discrete modes of Westerly Jet circulation, caused the amplification of millennial-scale variability of the East Asian summer monsoon and East Asian winter monsoon and provided teleconnection mechanism(s) for Dansgaard-Oeschger cycles.Recent and novel advances in drilling technology and newly developed analytical tools enabled collection and examination of sediment records that were impossible to acquire even a few years ago. The newly engineered half advanced piston corer enabled recovery of the deepest piston core in Deep Sea Drilling Project/ Ocean Drilling Program/IODP history (490.4 m in IODP Hole U1427A); that achievement was also the deepest continuously recovered piston cored sequence, initiated at the mudline and penetrating to ~500 m core depth below seafloor, Method A (CSF-A). Technological advances delivered a series of "new surprises" (e.g., pristine dark-light laminae from ~12 Ma sediment recovered by piston core from 410 m CSF-A at IODP Site U1425 and from 210 m CSF-A at IODP Site U1430) that will stimulate new scientific in-

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Section: Resultsmentioning

confidence: 99%

Section: Preliminary Scientific Assessmentmentioning

confidence: 99%

Section: Site Summaries Site U1422mentioning

confidence: 99%

Section: Proc Iodp | Volume 346mentioning

confidence: 99%

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Expedition 346 summary

Tada¹,

Murray²,

Zarikian³

et al. 2015

Proceedings of the IODP

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“…Interstitial water samples were extracted from sediment cores using two methods: whole-round squeezing and Rhizon sampling (see the "Methods" chapter [Tada et al, 2015a]). In general, two whole-round samples were taken per core, usually at the base of Sections 1 and 4.…”

Section: Interstitial Water Collectionmentioning

confidence: 99%

Data report: reanalysis of interstitial water barium, iron, and sulfur concentrations at Sites U1426 and U1427

Miller¹,

Dickens²

2017

Proceedings of the IODP

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Within the south of the marginal sea between Japan and Korea, interstitial water (IW) profiles exhibit a prominent sulfate-methane transition (SMT) in the upper few meters of sediment. As the SMT has become a focus of attention, IW samples were collected at high spatial resolution within shallow sediment at Sites U1426 and U1427 and examined on board the R/V JOIDES Resolution, under the auspices of the Integrated Ocean Drilling Program, for a wide range of dissolved species. However, irregularities were noted for the sulfate (SO 4 2-), Ba, and Fe concentration profiles, each of importance to understanding the SMT. Splits of 134 IW samples, prepared with HNO 3 during the expedition, were therefore reanalyzed at Rice University for S, Ba, and Fe, with S as a proxy for SO 4 2-. Results of 134 samples included 29 duplicates with low percent difference (0.01%-34.69%, 0.01%-14.90%, and 0.03%-35.19%) and 6 spiked blanks with low percent error relative to stock solution concentration (1.59%, 2.41%, and 4.11%). The shore-based S and Ba profiles have trends similar to those determined on ship but with obvious offsets. The remeasured Fe profiles are comparable to those measured on ship, albeit with more data points. Although the IW samples were measured between 95 and 113 days after the expedition, the new results have high data reproducibility, render smooth profiles, and give more expected chemistry across the SMTs. For these three elements, we suggest the new results should replace the shipboard data.

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