Expedition 356 methods

Gallagher, S.J.; Fulthorpe, C.S.; Bogus, K.; Scientists, Expedition

doi:10.14379/iodp.proc.356.102.2017

Cited by 20 publications

(75 citation statements)

References 70 publications

(93 reference statements)

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“…As the HNGS response is influenced by the borehole diameter, data are corrected for borehole diameter variations. In the upper ~80 m, the HNGS measures NGR through the drill pipe, causing an attenuated signal [ Gallagher et al , ]. Although relative variations in this interval are meaningful, we do not interpret this portion of the record.…”

Section: Methodsmentioning

confidence: 97%

“…Sediment recovery at Site U1463 (18°58′S, 117°37′E; 145 m water depth) was 80% [ Gallagher et al , ], permitting an excellent correlation between the lithology and the downhole wireline logs (Figure S2). Logging data do not include the upper 72 m because the drill pipe was positioned at that depth.…”

Section: Methodsmentioning

confidence: 99%

“…Our understanding of the mechanisms driving Australian continental aridity and constraints on the rate of paleoclimate change are limited by the absence of long, continuous climate archives on land and offshore. International Ocean Discovery Program (IODP) Expedition 356 [ Gallagher et al , ] recently drilled sediments on the northwest Australian shelf (Figure a), providing robust temporal constraints on Neogene climate. Here we present new climate records from IODP Site U1463 (Figure ) detailing the timing and magnitude of variability since 5.5 Ma (latest Miocene to Pleistocene) in a regional and global context.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene

Christensen

Renema

Henderiks

et al. 2017

Geophysical Research Letters

103

182

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Late Miocene to mid‐Pleistocene sedimentary proxy records reveal that northwest Australia underwent an abrupt transition from dry to humid climate conditions at 5.5 million years (Ma), likely receiving year‐round rainfall, but after ~3.3 Ma, climate shifted toward an increasingly seasonal precipitation regime. The progressive constriction of the Indonesian Throughflow likely decreased continental humidity and transferred control of northwest Australian climate from the Pacific to the Indian Ocean, leading to drier conditions punctuated by monsoonal precipitation. The northwest dust pathway and fully established seasonal and orbitally controlled precipitation were in place by ~2.4 Ma, well after the intensification of Northern Hemisphere glaciation. The transition from humid to arid conditions was driven by changes in Pacific and Indian Ocean circulation and regional atmospheric moisture transport, influenced by the emerging Maritime Continent. We conclude that the Maritime Continent is the switchboard modulating teleconnections between tropical and high‐latitude climate systems.

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Section: Methodsmentioning

confidence: 97%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Indonesian Throughflow drove Australian climate from humid Pliocene to arid Pleistocene

Christensen

Renema

Henderiks

et al. 2017

Geophysical Research Letters

103

182

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“…Black dots (left) = locations of smear slide samples. See Figure F7 in the Expedition 356 methods chapter (Gallagher et al, 2017a) for lithology key. from coarse silt to sand are also common ( Figures F5, F6).…”

Section: Smear Slidesmentioning

confidence: 99%

Site U1460

Gallagher¹,

Fulthorpe²,

Bogus³

et al. 2017

Proceedings of the International Ocean Discovery Program

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Site U1460 ended at 1945 h on 15 August. A total of 133 cores were recovered with the HLAPC system; of the 606.7 m cored, 592.2 m was recovered (recovery = 97%). Hole U1460A After arriving at Hole U1460A (27°22.4948′S, 112°55.4296′E), preparations for coring commenced. As a result of previous difficulty establishing the mudline core at Site U1459 (broken core barrel), the seafloor was tagged with the bit to determine its precise location and whether it was as hard as the previous site. A nonmagnetic HLAPC core barrel was dressed with a core liner, picked up, and run into the hole. Hole U1460A was started at 0115 h on 13 August. Based on the recovery of the mudline core, the seafloor depth was calculated to be 214.5 mbsl. Coring continued with the HLAPC system through Core 356-U1460A-64F to 298.2 m DSF. After the mudline core, each core was advanced 4.7 m despite partial strokes on Cores 2F, 9F, and 64F. Hole U1460A was cored to a final depth of 300.1 m DSF (Core 65F). During coring, a routine slip, cut, and retermination of the coring line was performed. At the conclusion of coring, the drill string was pulled back to 231.6 m DSF and the top drive was set back. The drill string was pulled back to just above the seafloor, clearing the seafloor at 0605 h on 14 August and ending Hole U1460A. Of 300.1 m cored, 291.39 m of material was recovered (recovery = 97.1%). The total time spent on Hole U1460A was 33.25 h. Hole U1460B After offsetting the vessel 20 m north of Hole U1460A, preparations were made to begin Hole U1460B (27°22.4867′S, 112°55.4265′E). A nonmagnetic HLAPC core barrel was dressed with a core liner, picked up, and run into the hole. Hole U1460B was started at 1920 h on 14 August. Based on the recovery of the mudline core, the seafloor depth was calculated to be 214.4 mbsl. Coring continued with the HLAPC system through Core 356-U1460B-68F to 306.6 m DSF. After the mudline core, each core was advanced by recovery in an attempt to cover any gaps from Hole U1460A. Of the 306.6 m cored, 800.81 m was recovered (recovery = 98%). Also in this hole, in situ temperature measurements were made with the APCT-3 before recovering Cores 12F, 20F, 28F, 33F, and 36F. During coring, a routine slip, cut, and retermination of the coring line was performed. At the conclusion of coring, the drill string was pulled back to 260.7 m DSF and the top drive was set back. The drill string was pulled from the hole and the advanced piston corer/extended core barrel bit cleared the rig floor at 1940 h. The thrusters and hydrophones were pulled and secured, and at 1945 h on 15 August, Site U1460 concluded. The total time spent on Hole U1460B was 37.75 h.

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“…Thermal conductivity was also measured in several sections and varied between 1.0 and 1.3 W/(m·K). Bulk density was determined using both GRA and MAD methods (see Physical properties in the Expedition 356 methods chapter [Gallagher et al, 2017a]). These two methods yielded consistent increases in density with depth to 160 m CSF-A, below which it becomes variable.…”

Section: Physical Propertiesmentioning

confidence: 99%