Now Sailing: Reykjanes Mantel Convection and Climate

Expedition 395C will begin addressing the overall goal of exploring the relationships between deep Earth processes, ocean circulation, and climate near the Reykjanes Ridge by working on three sites with primarily crustal objectives.  

Recently Completed (June 2021): Japan Trench Paleoseismology

Expedition 386 aims to test and develop submarine paleoseismology by recovering the continuous upper Pleistocene to Holocene stratigraphic successions of trench-fill basins along an axis-parallel transect in the Japan Trench.

Recently Completed (June 2021): Complete South Atlantic Transect Reentry Systems

The South Atlantic Transect is a multidisciplinary scientific ocean drilling project that comprises of multiple expeditions aimed at recovering complete sedimentary sections and the upper underlying oceanic crust along a slow/intermediate spreading rate Mid-Atlantic Ridge crustal flow line at ~31°S.

Completed (September 2020): JOIDES Resolution Engineering Testing

Expedition 384 performed engineering testing at sites of opportunity in the North Atlantic. Testing focused on deep (>1 km) drilling and coring in igneous ocean crust, following some recommendations made by the Deep Crustal Drilling Engineering Working Group and the JR Facility Board.

Completed (February 2020): South Pacific Paleogene Climate

This JOIDES Resolution expedition studied climate and oceanographic conditions during the Cenozoic by targeting sediments deposited during the very warm late Paleocene and early Eocene in the southern Pacific Ocean.

Completed (November 2019): Guaymas Basin Tectonics and Biosphere

This JOIDES Resolution expedition to the Gulf of California studied the relationship of tectonics, magmatism, sedimentation, carbon cycling, and microbial activity in an active rift basin and hydrothermal area by drilling and coring igneous sills emplaced into organic-rich sediments.

Completed (July 2019): Dynamics of Pacific Antarctic Circumpolar Current

This JOIDES Resolution expedition investigated the behavior and variability of the Pacific Antarctic Circumpolar Current over the past 5 million years using high-resolution sediment records, focusing on how the coupled dynamics of the ocean, atmosphere, and cryosphere affect global climate.

Completed (May 2019): Iceberg Alley and South Falkland Slope Ice and Ocean Dynamics

The JOIDES Resolution worked in Iceberg Alley, where Antarctic icebergs exit into the Antarctic Circumpolar Current, to reconstruct past variability in Antarctic Ice Sheet mass loss and oceanic and atmospheric circulation using late Neogene sediments recovered from the Scotia Sea. Expedition 382 also cored a sediment drift on the Falkland slope to obtain records that address regional variability in the ocean, atmosphere, nutrients, productivity, and ice-sheet dynamics in the SW Atlantic over at least the last million years. 

Completed (March 2019): NanTroSEIZE Deep Riser Drilling

Chikyu's 4th riser expedition of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE) attempted to deepen hole C0002 beyond 3000 meters below seafloor. While this result was not achieved, Chikyu drilled other targets relevant to the Nankai Seismogenic / Slow Slip Megathrust and achieved significant core recovery.

Completed (March 2019): Amundsen Sea West Antarctic Ice Sheet History

Expedition 379 investigated the past several million years of climatic and oceanographic changes as seen through influences on the Western Antarctic Ice Sheet (WAIS) by drilling sites on the continental shelf and rise of the Amundsen Sea. This JR expedition also explored the relationship of the Paleogene-to-Holocene glacial history of Western Antarctica to global records of ice volume and other proxies of air/sea average temperature.

Completed (December 2018): Return to Hole U1503A (South China Sea)

In this three-week follow-up to Expedition 368, JOIDES Resolution returned to core a critical site that documents the rapid transition from continental break-up to formation of normal oceanic crust. This operation was previously abandoned due to a breakdown in the JR draw-works.

Completed (July 2018): Brothers Arc Flux

This JR expedition to the Brothers submarine volcano in the southern part of the Kermadec Arc explored this magma-derived hydrothermal system, including fluid-rock interactions, the distribution of metals/metalloids and their pathway from depth to the seafloor, and the nature of microbial life in this extreme environment.

Completed (May 2018): Hikurangi Subduction Margin

This JR expedition to study slow slip events (SSE - episodic movements of the plate interface) along the northern Hikurangi subduction margin off New Zealand's North Island retrieved samples from the subducting plate and from primary thrust faults in the accretionary wedge. Borehole observatories that will continue to monitor the slip source area were installed at two sites in the frontal thrust and upper plate.

Completed (February 2018): NanTroSEIZE Front Thrust Long-Term Borehole Monitoring System

This expedition aboard Chikyu installed a long-term borehole monitoring system (LTBMS) in NanTroSEIZE hole C0006, complementing two existing nearby subseafloor observatories as part of the Nankai Trough Seismogenic Zone Experiment (NanTroSEIZE). The LTBMS will connect to Japan's DONET undersea cabled network, sending pressure, strain, and seismic data to the mainland in real time. 

Completed (March 2018): Ross Sea West Antarctic Ice Sheet History

This JR expedition recovered sediment cores and log data from drill sites in the eastern Ross Sea offshore western Antarctica to help understand the evolution of the Western Antarctic Ice Sheet (WAIS) over the past 20 million years, including its response to changes in ocean heat flux. This expedition has implications for ice sheet stability and assessing far-field sea-level rise from the current warming trend observed in the Southern Ocean over the past several decades.

Completed (January 2018): Creeping Gas Hydrate Slides and Hikurangi LWD

This JR expedition offshore New Zealand collected logging-while-drilling (LWD) data and core samples that will be used to explore the relationship between gas hydrate deposits and submarine landslides, a significant geohazard,   Additionally, Expedition 372 carried out advance work for the upcoming expedition to the Hikurangi subduction zone on New Zealand's eastern boundary by collecting LWD data in advance of coring and downhole measurements.  

Completed (December 2017): Corinth Active Rift Development

This expedition recovered sedimentary sequences at three sites in the Gulf of Corinth using the mission-specific platform Fugro Synergy.  Further study of these sediment cores will help understand how continental rifting leads to the formation of ocean basins, and will also provide details about the fault system associated with the active rift, its history, and current geohazard potential.

Completed (November 2017): Australia Cretaceous Climate and Tectonics

This JR expedition off southwest Australia recovered samples recovered from the Naturaliste Plateau and adjacent sedimentary Mentelle Basin to study the formation and collapse of the Cretaceous hothouse Earth, how ocean anoxic events are related to carbon perturbations, deep water formation during the Cretaceous, the influence of ocean circulation gateways around the Australian continent, and details of how plate motions have affected deposition of sediments in this area. Reports

Completed (September 2017): Tasman Frontier Subduction Initiation and Paleogene Climate

In this JOIDES Resolution expedition, six seafloor sites in the complex region of the Tasman Sea between Australia and New Zealand, sometimes referred to as Zealandia, were cored and logged to infer the timing and geometry of subduction initiation along the Tonga Kermadec Arc approximately 50 million years ago, which is the largest subduction initiation event identified in plate tectonics. The recovered sediments will provide constraints on how the beginning of subduction here changed ocean conditions and connections between the polar ocean to the south and more tropical regions to the north.