Expedition 309/312 summary

Teagle, D. A. H.; Alt, Jeffrey C; Umino, Susumu; Miyashita, Sumio; Banerjee, Neil R.; Wilson, Douglas S.

doi:10.2204/iodp.proc.309312.101.2006

Cited by 20 publications

(2 citation statements)

References 77 publications

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“…Cocos plate Figure F2. Simplified igneous stratigraphy of Hole 1256D following drilling operations on ODP Leg 206 and IODP Expedition 309/312, modified from Teagle et al (2006). Figure F3.…”

Section: Ole 1256dmentioning

confidence: 99%

Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D

Neo¹,

Yamazaki²,

Miyashita³

2009

Proceedings of the IODP

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In this data report we present major and trace element abundances for 159 samples recovered from Hole 1256D during Integrated Ocean Drilling Program Expedition 309/312, determined by X-ray fluorescence and inductively coupled plasma-mass spectrometry (ICP-MS). These samples represent a large proportion of rocks taken from the Expedition 309/312 sample pool, a collaborative effort to provide comprehensive geochemical analyses of a representative suite of samples from Hole 1256D. The samples analyzed are distributed from the sheet and massive flows (~750 meters below seafloor [mbsf]), through the sheeted dike complex (1060.9-1406.6 mbsf), and to the late-stage crosscutting dike (~1500 mbsf) at the present bottom of hole underlying the two gabbro intrusions. Analytical procedures and accuracy of analysis are described and compared with shipboard analyses from Expeditions 309 and 312. There are clear compositional differences for some elements between the shipboard analyses and this study. Some of the samples collected during Expedition 312 were not completely dissolved by routine acid digestion, most probably because of the presence of zircon, resulting in low concentrations of elements hosted by zircon including Zr, Hf, Th, and U. These samples were further analyzed by ICP-MS following alkali fusion.Most rocks sampled during Expedition 309/312 display normal mid-ocean-ridge basalt (N-MORB) signatures. However, three samples yield trace element patterns with light rare earth element enrichment patterns. The late dike recovered from the present bottom of Hole 1256D has a highly evolved N-MORB chemistry.

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Section: Ole 1256dmentioning

confidence: 99%

Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D

Neo¹,

Yamazaki²,

Miyashita³

2009

Proceedings of the IODP

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“…At 15.2 Ma, Site U1560 is the second to youngest location on the SAT and will be compared to older and younger crustal material cored at Expedition 390/393 sites. Site U1560 is of similar age but contrasting environment to the deep drilling at the superfast-spreading Hole 1256D (Wilson et al, 2006;Expedition 309/312 Scientists, 2006;Expedition 335 Scientists, 2012) on crust that formed at the East Pacific Rise during an episode of superfast-spreading rate in a region of high pelagic productivity and rapid sedimentation (Shipboard Scientific Party, 2003b). Science objectives at Site U1560 are to (1) investigate the history of the low-temperature hydrothermal interactions between the aging ocean crust and the evolving South Atlantic Ocean and quantify past hydrothermal contributions to global geochemical cycles, (2) collect samples of the sediment-and basalt-hosted deep biosphere beneath the low-productivity South Atlantic Gyre that will be used to refine global biomass estimates and investigate microbial ecosystems' responses to variable conditions, and (3) construct paleoceanographic records of carbonate chemistry and deepwater mass properties across the western South Atlantic Ocean through key Cenozoic intervals of elevated atmospheric CO 2 and rapid climate change.…”

Section: Background and Objectivesmentioning

confidence: 99%

Expedition 390/393 summary

Coggon,

Teagle,

Sylvan

et al. 2024

Proceedings of the International Ocean Discovery Program

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Introduction 6 Background 13 Scientific objectives 23 Operational strategy 24 Preexpedition engineering and coring operations 25 Expedition 390C and 395E principal results 26 Revised Expedition 390 and 393 operational strategy 31 South Atlantic Transect drill sites 31 Site summaries 94 Expedition 390 preliminary scientific assessment 98 Expedition 393 preliminary scientific assessment 103 References

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Structural and petrophysical characterization of the upper basement crustal section at ODP/IODP Site 1256 (East Pacific Ocean)

Fontana

Tartarotti

2013

Geochem Geophys Geosyst

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[1] New ocean crust is constantly being formed from mid-ocean ridge axis. Voluminous flows of lava are emplaced also away from the ridge axis, adding off-axis crustal layers to the crustal pile. Research on deep sea is of great importance to better understand the mechanisms and the nature of the crust forming and evolution. In this work, we decipher the first stages of the postmagmatic evolution of an intact volcanic section from the upper oceanic crust at ocean drilling program/integrated ocean drilling program (ODP/IODP) Site 1256 (Eastern Pacific Ocean). Using for the first time an innovative core-log integration technique to match direct (core-related) and indirect (borehole-related) data by depth shifting and reorienting individual core pieces recovered by drilling, we are able to identify the clusterization of structures and physical properties within distinct downdeep ''strong'' and ''weak'' lava zones, reflecting the cooling and tectonic evolution of lavas rather than lithological variations. We define the evolution of the structural zones that typically affect lava flows: colonnades and entablature zones, studying an offaxis lava flow encountered in present-day upper ocean crust. For the same off-axis flow, we are also able to suggest the lava flow direction (NW-SE) and its relationships with the paleoridge axis. Despite the environmental difficulties in the study of the subseafloor under deep water and using only onedimensional data deriving from ocean drilling, this work shows how an array of diverse data can be integrated into a coherent interpretation of lava flow history obtaining detailed information on the mechanism of submarine lava emplacement and flow.

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Expedition 309/312 summary

Cited by 20 publications

References 77 publications

Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D

Data report: bulk rock compositions of samples from the IODP Expedition 309/312 sample pool, ODP Hole 1256D

Expedition 390/393 summary

Structural and petrophysical characterization of the upper basement crustal section at ODP/IODP Site 1256 (East Pacific Ocean)

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