Central sites

Früh-Green, G. L.; Orcutt, B.; Green, S.L.; Cotterill, C.; Morgan, Sally; Akizawa, Norikatsu; Bayrakci, Gaye; Behrmann, Jan H.; Boschi, Chiara; Brazleton, W.J.; Cannat, Mathilde; Dunkel, Kristina G.; Escartı́n, J.; Harris, Michelle; Herrero‐Bervera, Emilio; Hesse, K.; John, Barbara E.; Lang, Susan Q.; Lilley, Marvin D.; Liu, H.-Q.; Mayhew, L. E.; McCaig, A.M.; Ménez, Bénédicte; Morono, Yuki; Quéméneur, Marianne; Rouméjon, S.; Ratnayake, Amila Sandaruwan; Schrenk, M. O.; Schwarzenbach, Esther M.; Twing, Katrina I.; Weis, Dominique; Whattham, S.A.; Williams, Megan; Zhao, Rui

doi:10.14379/iodp.proc.357.104.2017

Cited by 7 publications

(10 citation statements)

References 6 publications

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“…The mafic intrusions in these cores have pale brown to pinkish-brown central domains that are surrounded by external dark green domains made up mostly of chlorite (chlorite blackwall), which in turn grade into talc-amphibole-rich domains at the contact to the serpentinites. The pinkish brown domains were originally described as rodingites (Früh-Green et al, 2017d), which have been found during previous sampling campaigns along the southern wall of the Atlantis Massif (Boschi et al, 2006a). However, subsequent analyses have yet to identify typical Ca-Al silicates, such as epidote (clinozoisite), diopside, prehnite, (hydro)garnet or vesuvianite, which are commonly found in rodingites in similar associations with serpentinites.…”

Section: Serpentinization and Metasomatismmentioning

confidence: 99%

Magmatism, serpentinization and life: Insights through drilling the Atlantis Massif (IODP Expedition 357)

Früh-Green

Orcutt

Rouméjon

et al. 2018

Lithos

101

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Section: Serpentinization and Metasomatismmentioning

confidence: 99%

Magmatism, serpentinization and life: Insights through drilling the Atlantis Massif (IODP Expedition 357)

Früh-Green

Orcutt

Rouméjon

et al. 2018

Lithos

101

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“…REE patterns group by lithology ( Figure F20; see Figure F23 in the Central sites chapter [Früh-Green et al, 2017a] and Figure F11 in the Western sites chapter [Früh-Green et al, 2017d]). Serpentinized ultramafic rocks have relatively flat to slightly light rare earth element (LREE) depleted chondrite-normalized patterns (typically centered around 1 or below).…”

Section: Summary Of All Sitesmentioning

confidence: 99%

Eastern sites

Früh-Green¹,

Orcutt²,

Green³

et al. 2017

Proceedings of the International Ocean Discovery Program

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Operations 3 Lithology, alteration, and structure 15 Bulk rock geochemistry 20 Fluid chemistry 23 Microbiology 24 Sensor package data 29 Physical properties 28 Borehole plugs 32 Downhole logging 34 Paleomagnetism 35 References Operations During Expedition 357, cores were recovered from two sites in the eastern area of Atlantis Massif: Sites M0068 and M0075 (Figure F1; Table T1). Newly acquired multibeam data, combined with preexisting data sets, were evaluated prior to each site to guide the drill teams with regard to anticipated seabed conditions and slope. Site M0068 Cores were recovered from two holes at Site M0068 (proposed Site AM-02A), with an average site recovery of 58.88%. The mean water depth for the two holes was 1102.35 m with no tidal range. The total time spent on station was 2.36 days. Hole M0068A The RSS James Cook moved onto Site M0068 at 2208 h on 5 November 2015, with the site position centered over the British Geological Survey RockDrill2 (RD2) port-side deployment position. The vessel settled into dynamic positioning (DP) mode. Prior to coring at each location, a conductivity, temperature, and depth (CTD) cast was conducted to quantify the background geochemistry and microbiology within the water column. The CTD was deployed at 2248 h and held at 10 m water depth for a full systems check. At 2332 h, the CTD was 1.6 m off the bottom, and the first three Niskin bottles were fired. Two more Niskin bottles were fired on the way up, with a final one fired near the surface (see Table T5 in the Expedition 357 summary chapter [Früh-Green et al., 2017c]). The CTD was recovered to deck at 0005 h on 6 November. During the ship CTD cast, the RD2 was made ready for deployment, but a communications problem with the CTD sensor mounted on the drill delayed launch. The RD2 was deployed at 0124 h; however, problems with the winch spooling mechanism and the methane sensor on the water sensor package meant the drill was recovered at 0146 h before landing on the seafloor. At 0234 h, the RD2 was launched again, landing on the seafloor at 0356 h after a full mid-water column systems check. Coring operations commenced at 0418 h. The first core run was completed at 0602 h. However, a problem with the arm shift meant the RD2 had to be recovered after a total penetration of 1.97 m. Prior to recovery, the Niskin bottles on the water sampling package were fired. The RD2 was on deck and secure by 0835 h. The vessel began to transit to Site M0069 at 0840 h on 6 November. Preparations began for deploying the Meeresboden-Bohrgerät 70 (MeBo) drill. One coring attempt was made in Hole M0068A to a maximum depth of 1.97 m with 23.92% recovery. Hole M0068B The vessel arrived on station at 1545 h on 23 November 2015. RD2 preparations continued until 1757 h, when the drill was deployed. At 1836 h, the RD2 was brought back on deck after a midwater column systems check revealed two sensor inputs were G.L. Früh-Green et al. Eastern sites IODP Proceedings 2 V o l u m e 3 5 7

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“…S13-S14). Although core samples from Site M0076 tended to be coherent, they were often rich in veins (Früh-Green et al, 2017b), which likely allowed transfer of PFC into the interiors of some samples (Supplement Figs. S15-S16).…”

Section: Assessment Of Sample Quality For Deep Biosphere Investigationsmentioning

confidence: 99%

Contamination tracer testing with seabed drills: IODP Expedition 357

et al. 2017

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Abstract. IODP Expedition 357 utilized seabed drills for the first time in the history of the ocean drilling program, with the aim of collecting intact sequences of shallow mantle core from the Atlantis Massif to examine serpentinization processes and the deep biosphere. This novel drilling approach required the development of a new remote seafloor system for delivering synthetic tracers during drilling to assess for possible sample contamination. Here, we describe this new tracer delivery system, assess the performance of the system during the expedition, provide an overview of the quality of the core samples collected for deep biosphere investigations based on tracer concentrations, and make recommendations for future applications of the system.

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Central sites

Abstract: Operations 3 Lithology, alteration, and structure 20 Bulk rock geochemistry 21 Fluid chemistry 21 Microbiology 23 Sensor package data 29 Borehole plugs 31 Physical properties 35 Downhole logging 36 Paleomagnetism 38

Cited by 7 publications

References 6 publications

Magmatism, serpentinization and life: Insights through drilling the Atlantis Massif (IODP Expedition 357)

Magmatism, serpentinization and life: Insights through drilling the Atlantis Massif (IODP Expedition 357)

Eastern sites

Contamination tracer testing with seabed drills: IODP Expedition 357

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