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Expedition Log

04.11.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 9

Understanding the evolution of Alarcón Rise Dave Clague writes: As previously mentioned, the Alarcón Rise is the northernmost segment of the East Pacific Rise spreading center. The Alarcón Rise is roughly 50 kilometers long. It is the axis along which new ocean crust is forming as a rocky ridge, compared to the short spreading segments …

Expedition Log

04.10.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 8

Traveling back in time Julie Bowles writes: Today was like traveling back in time! Our goal was to establish an approximate eruptive history at this location, so we started our dive about three kilometers to the west of the active Alarcón Rise axis. Flows out here are generally tens of thousands of years older than what is …

Expedition Log

04.09.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 7

Hydrothermal chimneys, basaltic pillows, and lava flows Jenny Paduan writes: Today’s dive was, as the Wisconsinites on board (Julie Bowles, Knute Brekke, and Patrick Mitts) would say, a smorgasbord! There were new and very impressive hydrothermal chimneys, mounds of lovely elongate basaltic pillows, and a vast flood of a relatively young, jumbled sheet-like lava flow, which …

Expedition Log

04.08.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 6

Tamayo transform fault Julie Bowles writes:Today’s dive targeted the southernmost end of the Alarcón Rise, where it transitions from oceanic spreading center to what is called a transform fault. Whereas the volcanically-active spreading center is where new oceanic crust is formed and two tectonic plates move away from one another, a transform fault is not …

Expedition Log

04.07.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 5

Meyibó hydrothermal vent field Ronald Spelz writes: Today’s dive on the Alarcón Rise started in a newly discovered active hydrothermal field, a vent through which hot fluids emerge from the seafloor. The tall chimney edifices, along with their peculiar deep-sea inhabitants, and their jetting hot fluids, literally gave us a “very warm” welcome. We decided …

Expedition Log

04.06.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 4

High-silica lava flows at Alarcón Rise Brian Dreyer writes: A primary goal of today’s dive was to explore the extent of high-silica lava flows at Alarcón Rise. These flows are common on land volcanoes but rare at oceanic spreading centers—sites where two tectonic plates move away from one another. Most spreading centers erupt low-silica lava …

Expedition Log

04.05.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 3

Pillow lavas Chrissy Maschmeyer writes: The purpose of our expedition today was to determine if volcanic rocks containing silica occurred along the spreading ridge south of the previously identified rhyolitic lava dome. Oceanic ridges typically erupt basalt, which is denser and contains less silica than continental crust, and is considered to be more directly derived from …

Expedition Log

04.04.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 2

Exploring a mid-ocean-ridge rhyolite dome Ryan Portner writes: Today we dove on the Alarcón Rise mid-ocean ridge. With few exceptions, mid-ocean ridges typically lie very deep beneath the sea surface. They are a locus of active volcanoes, hydrothermal vents and chimneys, and an abundance of life. Mid-ocean ridges occur where two tectonic plates move away …

Expedition Log

04.03.15

Gulf of California 2015, Leg 5 – Volcanoes and Seamounts – Log 1

A full day’s dive in volcano of Alarcón Seamounts Jenny Paduan writes: The R/V Western Flyer departed last evening from Pichilingue Harbor near La Paz, Mexico. The weather was clear and warm and the sea was smooth as glass. We steamed through the night and arrived in time to do a full day’s ROV dive on the …

Expedition Log

03.30.15

Gulf of California 2015, Leg 4 – Seafloor Biology- Log 5

A Glimpse into a Mysterious, Oxygen-limited World As a Ph.D. student in biological oceanography at the Scripps Institution of Oceanography at the University of California, San Diego, I was thrilled to be invited by chief scientist Jim Barry to take part in the MBARI Gulf of California 2015 Expedition. For my thesis, I am working …

Expedition Log

03.29.15

Gulf of California 2015, Leg 4 – Seafloor Biology – Log 4

Diving in the Canyon off Cabo Pulmo We are off Cabo Pulmo, a Mexican national park with the most northerly tropical coral reef in the world. Cabo Pulmo was originally colonized by pearl divers. “Pulmo” refers to the breath-holding by the divers—pulmo is a Latin root for lung. Pearl divers were replaced with fishermen, who fished …

Expedition Log

03.27.15

Gulf of California 2015, Leg 4 – Seafloor Biology – Log 3

A Tour of the R/V Western Flyer Mariah Salisbury writes: Unlike a terrestrial vehicle, which you can just fuel up and drive, it takes a lot more for the Western Flyer to get underway. Lance Wardle, who is sailing as chief engineer on this leg of the cruise, tells me it’s more like running a self-contained city …

Expedition Log

03.25.15

Gulf of California 2015, Leg 4 – Seafloor Biology – Log 2

Murky Conditions in the Salsipuedes Basin ROV dives in the Salsipuedes Basin can be rewarding, yet challenging–no real surprise since Salsipuedes translates to “escape if you can”. The channel is known for its very strong tidal currents, due to the shape of the Gulf. Unimodal seiches commonly occur in the Gulf—it sounds technical, but just …

Expedition Log

03.22.15

Gulf of California 2015, Leg 4 – Seafloor Biology – Log 1

Observing the Seafloor Community We steamed for a day to arrive at Isla Tortuga—a small, rugged, and beautiful little island near the middle of the Gulf. Fortunately, the weather has been great, and everyone aboard seems to be feeling fine and in good spirits. A principal goal for the expedition is to increase our understanding …

Expedition Log

03.16.15

Gulf of California 2015, Leg 3 – Biodiversity and Biooptics – Log 9

Cruise Highlights We are now even closer to La Paz and are heading down to 1,600 meters with the ROV for one last look in the deep waters of the Gulf of California. The divers have dried their gear and packed it away as there will be no blue-water dive today due to time constraints. …

Expedition Log

03.15.15

Gulf of California 2015, Leg 3 – Biodiversity and Biooptics – Log 8

More deep-sea fauna Rebeca Gasca writes: This is a new, exciting opportunity to work with colleagues at MBARI and other institutions, all interested in exploring the peculiar and poorly-known fauna dwelling in the water column but especially in deep waters. The ROV Doc Ricketts is collecting valuable biological samples and enabling us to discover fauna that can’t …

Expedition Log

03.14.15

Gulf of California 2015, Leg 3 – Biodiversity and Biooptics – Log 7

Hyperiid Amphipods and Ctenophores Bill Browne writes: I am investigating the genetic patterns underlying animal diversity. To me, the two most interesting groups of midwater animals in the Gulf of California are the hyperiid amphipods (bug-like crustaceans) and ctenophores (comb jellies). Why hyperiids? Many midwater organisms have unusual eyes. Hyperiid amphipods have a particularly impressive …

Expedition Log

03.13.15

Gulf of California 2015, Leg 3 – Biodiversity and Biooptics – Log 6

Bioluminescent Organisms Darrin Schultz writes: I work in Steve Haddock’s lab where I study bioluminescent organisms, animals that make their own light, much like fireflies. On our leg of the Gulf of California expedition, we have seen and documented many luminous creatures, including jellyfish, shrimp, fish, comb jellies, worms, tiny crustaceans, and even “glowing dolphins” …

Expedition Log

03.12.15

Gulf of California 2015, Leg 3 – Biodiversity and Biooptics – Log 5

Diving for Jellies in Mexico Wyatt Patry writes: At the Monterey Bay Aquarium we collaborate closely with our sister institution, MBARI in many diverse ways. As a Senior Aquarist my primary goals are to find new jellies to display and develop innovative ways to share them with our guests. I jump at every chance to …