2021-10-08T16:17:53.344

NotApplicable

2021-10-08T19:06:43.83

Diving to 900m to collet 2 pushcores and a rock sample.

2021-10-19T13:30:00

NotApplicable

2021-10-19T15:34:28.713

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objective of this dive is to collect heat flow data using the heat flow probe on transects across the vent field. The lateral extent of the heat flow transects will depend on how rapidly heat flow reduces toward background levels away from the vents - this distance is unlikely to exceed 500 m. Secondary goals include collecting hydrothermal vent fluid samples at selected vents using both major and gas tight samplers, collecting push cores, collecting rocks, and collecting Niskin bottle samples of ambient water.

2021-10-19T15:40:06.52

NotApplicable

2021-10-20T02:53:53.206

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objective of this dive is to collect heat flow data using the heat flow probe on transects across the vent field. The lateral extent of the heat flow transects will depend on how rapidly heat flow reduces toward background levels away from the vents - this distance is unlikely to exceed 500 m. Secondary goals include collecting hydrothermal vent fluid samples at selected vents using both major and gas tight samplers, collecting push cores, collecting rocks, and collecting Niskin bottle samples of ambient water.

2021-10-20T13:30:35

NotApplicable

2021-10-21T00:56:31.238

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objectives of this dive are (1) to collect vent fluid samples at two sites ("cave with ponded fluid", "marker 5 vent") and (2) to continue collecting heat flow data using the heat flow probe on transects across the vent field. The lateral extent of the heat flow transects will depend on how rapidly heat flow reduces toward background levels away from the vents - this distance is unlikely to exceed 500 m. A secondary goal is to collect push cores of sediment near and far from the vents.

2021-10-21T12:59:00

NotApplicable

2021-10-21T23:30:11.754

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objective of this dive is to continue collecting heat flow data using the heat flow probe on transects across the vent field. A secondary goal is to collect push cores of sediment near and far from the vents. The on-bottom location is 550 m to the west of the northern pair of edifices. This location is on an AUV subbottom profile track, and the dive will begin with a heat flow transect working towards the vents along the subbottom track.

2021-10-22T14:00:16

NotApplicable

2021-10-23T00:55:46.462

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objective of this dive is to continue collecting heat flow data using the heat flow probe on transects across the vent field. A secondary goal is to collect push cores of sediment near and far from the vents. The on-bottom location is about 125 m east of the center of the northern pair of edifices, corresponding to the site of the last heat flow measurement yesterday during S0465. This location is on an AUV subbottom profile track, and the dive will begin by continuing the heat flow transect working eastward along the subbottom track away from the vents.

2021-10-23T14:00:00

NotApplicable

2021-10-24T01:10:05.508

The Auka Vent Field in the South Pescadero Basin consists of eight large and several small hydrothermal edifices in a north-south-ish oriented crescent spanning 600 m south to north. As at JaichMaa 'ja'ag, the largest carbonate edifices are up to 50 m across and 20 m high. Auka was discovered during a 2015 MBARI expedition when Mapping AUV surveys revealed apparent vent features and subsequent ROV dives confirmed active venting with carbonate dominated chimneys and edifices. This dive has two primary objectives: (1) obtain combined ti-major and gas tight vent fluid samples from two vents, and (2) augment heat flow profiles begun during the 2018 expedition. One of the fluid sample sites will be the vent known as Matterhorn, a tubeworm covered chimney which has not previously been sampled. We will then proceed north to Diane’s vent, a vigorous high-temperature vent (289° C when last seen in 2018). Diane's Vent, is on the western boundary of the Auka field, about 115 m north of the Matterhorn. At Diane's Vent we will pay respects at a memorial plaque for Diane Adams, a well known, well respected, and well loved marine Biologist from Rutgers University and Woods Hole Oceanographic Expedition. This plaque was placed at Diane's Vent in 2017 by her colleagues from WHOI using ROV Hercules operated from Ocean Exploration Trust's EV Nautilus. During the 2018 expedition FK181031, heat flow data were collected at Auka along three east-west profiles and one north-south profile, but the east west profiles extended much further to the east (basinward) than to the west. During this dive we will extend the northernmost 2018 east-west profile to the west, away from the axis of the South Pescadero Basin. This will follow an AUV subbottom profile track named 20181104m1-0008. As in previous dives, a secondary goal is to collect push cores of sediment near and far from the vents.

2021-10-24T14:00:00

NotApplicable

2021-10-25T00:46:34.012

The JaichMaa 'ja'ag Vent Field consists of four large and several small hydrothermal edifices aligned north-south-ish and spanning a 400 m distance. The large edifices are up to 50 m across and 22 m high. The primary objective of this dive is to continue collecting heat flow data using the heat flow probe on transects across the vent field. A secondary goal is to collect push cores of sediment near and far from the vents. The on-bottom location is about 400 m south of the southernmost of the large edifices. This location is on an AUV subbottom profile track, and the dive will begin by continuing the heat flow transect working northward along the subbottom track, which passes east of the chain of edifices.

2021-10-25T10:31:55

NotApplicable

2021-10-25T16:10:37.919

The geology and morphology of the east margin of the Baja California Peninsula reflects the continental rifting that has created the Gulf of California, ultimately resulting in the several en echelon basins we have been studying. These rifting processes have included low angle normal faulting that has left behind many blocks of the pre-existing continental crust that have been broken up, tilted, and rotated. Ron Spelz (Chief Scientist of Leg 1) and his students are studying these aspects of the rifting history, and wish to test hypotheses about the formation of the many topographic highs between the Baja east coast and the deep basins. This dive will attempt to sample rocks on the steep eastern scarp of a topographic high located about 24 km east of Isla Espiritu Santo. This short dive will occur early in the morning during the transit in to La Paz (Puerto Pichilingue) ending FK210922 Leg 2. We hope to begin the dive at 0500 or shortly thereafter, and the ROV must be on deck somewhere between 1030 and 1100 (TBD by the bridge). The site does not have good multibeam coverage, and so a pass will be made with the EM302 multibeam before setting up on the dive. The starting depth will be about 700 m, halfway up the scarp, and the dive will work up to the top of the ridge, sampling rocks as opportunity arises.

2021-10-29T12:00:21

NotApplicable

2021-10-29T22:59:51.019

The Auka Vent Field in the South Pescadero Basin consists of eight large edifices and several small hydrothermal features spanning 600 m in a south to north orientation. Auka was discovered during a 2015 MBARI expedition when Mapping AUV surveys revealed apparent vent features and subsequent ROV dives confirmed active venting with carbonate dominated chimneys and edifices. This dive has five primary objectives: (1) collect rock samples for microbial community and activity analyses from Matterhorn (2) sample animals at Matterhorn and in the surrounding area (3) obtain combined ti-major and gas tight vent fluid samples from the Matterhorn vent, (4) deploy colonization rings at top of Matterhorn and (5) collect push cores and corresponding temperature profiles near Matterhorn and from the mounds in the surrounding area. If time, we will transit to Diane’s vent to survey the site for future sampling.

2021-10-30T12:00:53

NotApplicable

2021-10-30T23:09:02.995

The Auka Vent Field in the South Pescadero Basin consists of eight large edifices and several small hydrothermal features spanning 600 m in a south to north orientation. Auka was discovered during a 2015 MBARI expedition when Mapping AUV surveys revealed apparent vent features and subsequent ROV dives confirmed active venting with carbonate dominated chimneys and edifices. This dive has 5 primary objectives: (1) collect rock samples for microbial community and activity analyses from Z vent (2) sample animals at Z vent and from the surrounding area (3) deploy colonization arrays at top of Z vent and (4) collect push cores and corresponding temperature profiles at oily mat site. (5) fly over survey the areal extent of mats around Z vent. If time, we will collect major water and gas tight samples.

2021-10-31T13:00:28

NotApplicable

2021-10-31T23:57:52.468

The Auka Vent Field in the South Pescadero Basin consists of eight large edifices and several small hydrothermal features spanning 600 m in a south to north orientation. Auka was discovered during a 2015 MBARI expedition when Mapping AUV surveys revealed apparent vent features and subsequent ROV dives confirmed active venting with carbonate dominated chimneys and edifices. This dive has several primary objectives: (1) collect push cores and corresponding temperature profiles at oily mat site near Z vent (2) fly over survey the areal extent of mats south of Z vent (3) collect animals and gas tight sample in diffuse flow near oily mat site (4) collect rock samples in areas of active venting for microbial community and activity analyses, and (5) sample animals at P vent.

2021-11-01T12:30:43

NotApplicable

2021-11-02T00:15:37.596

Exploratory dive to a suspected hydrothermal feature detected during seafloor mapping surveys found midway (~650 m) between Auka and the JaichMaa 'ja'ag Vent Fields. The objectives of this dive are to (1) explore and photo document the Midway vent feature and, if actively venting (2) measure temp of fluid flow and (3) collect representative animals, rock samples and push cores in the vicinity of the vent, followed by (4) heat flow measurements during a 650 m transit (heading 160°) to JaichMaa ‘ja’ag and (5) collect Xenophyophores along the way. If time permits, (6) we will take samples at the Big Sister of the ‘The Sisters’ site at JaichMaa ‘ja’ag, the northern most feature of a vent field that consists of four large and several small hydrothermal edifices aligned N-S over a 400 m distance. The Big Sister site has steep topography and is ~ 10 m high.

2021-11-02T12:28:23.035

NotApplicable

2021-11-02T23:57:22.667

The Auka Vent Field in the South Pescadero Basin consists of eight large edifices and several small hydrothermal features spanning 600 m in a south to north orientation. One of the smallest, is a high-temperature vent (~282 °C) named Dianne’s Vent with a 75-cm-wide orifice confined by 10-cm- wide chimney walls that only rise about 1.5 m above a small carbonate mound composed of chimney and flange talus. This dive has three primary objectives: (1) collect Xenophyophores en route to Dianne’s vent, (2) obtain combined ti-major and gas tight vent fluid samples from Dianne’s vent, (3) take high temp measurements and collect push cores / suction samples in mats near Dianne’s vent, then travel to a site 65 m to the east called The Dolomites to collect rocks, animals, and push cores and corresponding temperature profiles.

2021-11-03T12:45:34

NotApplicable

2021-11-04T12:27:34.661

The Auka Vent Field in the South Pescadero Basin consists of three large mounds - actively venting, steep-sided edifices 12–25 m high, with base diameters of 15–50 m. One of the largest, is a high-temperature vent (~207 °C) named P Vent. This dive has four primary objectives: (1) survey P vent (last visited in 2015), (2) collect rocks, animals, and, if possible, push cores from P vent (3) obtain combined ti-major and gas tight vent fluid samples from P vent, then (4) travel to a bacterial mat site NW of Z vent sampled on dive S0471 to collect additional push cores and corresponding temperature profiles.

2021-11-04T12:30:51

NotApplicable

2021-11-05T00:01:59.862

Tay Ujaa Big Cavern The JaichMaa ‘ja’ag vent field in the South Pescadero Basin consists of four large and several small hydrothermal edifices. One of the largest, is known as the Big Cavern (or Cave). This dive has three primary objectives: (1) travel to a bacterial mat and clam bed site SW of the Big Cavern to collect push cores and corresponding temperature profiles, inc heat flow measurements, (2) travel to the Big Cavern to deploy mineral colonization experiments and collect rocks and animals, (3) If time, travel to the Big Sister site to collect animal and rock samples

2021-11-05T13:00:09

NotApplicable

2021-11-06T00:06:51.714

The Auka Vent FIeld in the Pescadero Basin was discovered and characterized during 2012/2015 MBARI expeditions when Mapping AUV surveys revealed apparent vent features and subsequent ROV dives confirmed active venting with carbonate dominated chimneys and edifices. This dive has three primary objectives: 1) to collect push cores and corresponding temperature profiles at a site NW of Z vent. (2) to collect push cores and corresponding temperature profiles at the oily mat site SE of Z vent. (3) Then travel S to a site called The Dolomites to collect rocks, animals, and push cores and corresponding temperature profiles.

2021-11-06T12:00:24

NotApplicable

2021-11-07T00:15:35.476

The JaichMaa ‘ja’ag vent field in the South Pescadero Basin consists of four large and several small hydrothermal edifices. This dive has three primary objectives: (1) land at The Little Sister (Muutp Mpáan), the younger and more active of two adjacent mounds, at the north end of the vent field, to possibly collect rocks and animals, then transit to the Big Sister to the SE, to survey visually any changes from 2018, (2) travel south past the Big Cavern on the eastern side (look for the ctenophore outcrop), and (3) transit south to Red Hill (Weey 'kual), the southernmost mound in this vent field topped with lush colonies of Oasisia tubeworms, to collect animal and rock samples

2021-11-07T12:34:45.773

NotApplicable

2021-11-08T00:01:08.869

Exploratory dive to suspected hydrothermal features detected during seafloor mapping surveys located South of the JaichMaa 'ja'ag Vent Field. The objectives of this dive are to (1) explore and photo document the South Mound vents and, if actively venting, (2) measure temp of fluid flow and (3) collect representative animals, rock samples and push cores in the vicinity of the vent. (4) If time, heat flow measurements and Xenophyophores will be collected during the 780 m transit (heading 357º) to JaichMaa ‘ja’ag upside down flange site (5) collect push cores near the big Cavern and if time sample at Red Hill to the South. Study site coordinates: Southern most mound to the south: -108.8553594 23.9340751 Depth: -3652.530 m 108 51.321565 W 23 56.044507 N Big Cavern (Tay Ujaa) -108.855782; 23.941602; 3669 m (coordinates for the cavern) Upside down flange (dive S0476 waypoint) -108.855744; 23.941126 depth: 3663 m

2021-11-08T13:00:22

NotApplicable

2021-11-09T00:03:10.424

The Auka Vent Field in the South Pescadero Basin was discovered and characterized during expeditions in 2012-2015 with mapping AUV surveys and ROV dives in 2015-2018. The largest southernmost vent edifices in this region are Matterhorn and Z vent, where we explored and sampled earlier on this expedition. This dive has 4 primary objectives: 1) to land ~ 50 W of the Matterhorn to deploy a colonization array (to be picked up in April 2022), 2) travel to Matterhorn to recover a short-term mineral colonization experiment deployed on dive S0470, 3) transit to the Dolomites site to collect push cores and corresponding temperature profiles, and then 4) transit to Z vent to recover a short-term colonization array deployed on dive S0471. If time allows, we will do a temp survey in the sediments around the oily bacterial mats SE of Z vent. Study site coordinates (in order): Matterhorn Vent: -108.8630482° 23.9538143° Depth: -3641 m The Dolomites: -108.862350° 23.954747° Depth: -3636 m Z Vent: -108.86183° 23.956665° Depth: -3663 m Oily Mats (Way point from S0471): -108.861697° 23.956168° Depth: -3668 m

2021-11-09T11:41:09.853

NotApplicable

2021-11-10T00:04:21.074

The JaichMaa ‘ja’ag vent field in the South Pescadero Basin consists of four large and several small hydrothermal edifices. One of the largest, is known as the Big Cave (or Cavern). Our final dive has three primary objectives: (1) travel to a site slightly S of the Big Cavern mound to collect push cores and corresponding temperature profiles, (2) travel to the Big Cavern to deploy and observe/ recover colonization experiment from S0476 and collect rocks and animals, (3) travel to the Red Hill (Weey ‘kual) site to collect animal and rock samples. Upside down flange (S of Big Cave): -108.855744° 23.941126° Depth: -3663 m Study site coordinates: Upside down flange (S of Big Cave): -108.855744° 23.941126° Depth: -3663 m Big Cave: -108.855827° 23.941493° Depth: -3647 m Weey 'kual (Red Hill): -108.855866° 23.940522° Depth: -3646 m