Soluble, Colloidal, and Particulate Iron Across the Hydrothermal Vent Mixing Zones in Broken Spur and Rainbow, Mid-Atlantic Ridge

2021-10-01
Yücel, Mustafa
Le Bris, Nadine
The slow-spreading Mid-Atlantic Ridge (MAR) forms geological heterogeneity throughout the ridge system by deep crustal faults and their resultant tectonic valleys, which results in the existence of different types of hydrothermal vent fields. Therefore, investigating MAR hydrothermal systems opens a gate to understanding the concentration ranges of ecosystem-limiting metals emanating from compositionally distinct fluids for both near-field chemosynthetic ecosystems and far-field transport into the ocean interiors. Here, we present novel data regarding onboard measured, size-fractionated soluble, colloidal, and particulate iron concentrations from the 2018 R/V L'Atalante - ROV Victor research expedition, during which samples were taken from the mixing zone of black smokers using a ROV-assisted plume sampling. Iron size fractionation (200nm) data were obtained from onboard sequential filtering, followed by measurement via ferrozine assay and spectrophotometric detection at 562nm. Our results showed the persistent presence of a nanoparticulate/colloidal phase (retained within 20-200nm filtrates) even in high-temperature samples. A significant fraction of this phase was retrievable only under treatment with HNO3 - a strong acid known to attack and dissolve pyrite nanocrystals. Upon mixing with colder bottom waters and removal of iron in the higher parts of the buoyant plume, the larger size fractions became dominant as the total iron levels decreased, but it was still possible to detect significant (micromolar) levels of nanoparticulate Fe even in samples collected 5m above the orifice in the rising plume. The coolest sample (
FRONTIERS IN MICROBIOLOGY

Suggestions

Dissolved, Colloidal and Particulate Iron in Hydrothermal Vent Fluids and Rising Plumes from Broken Spur and Rainbow, Mid-Atlantic Ridge
Yücel, Mustafa; Le Bris, Nadine (2019-08-23)
Mid-Atlantic Ridge (MAR), with its slow spreading character, forms geological heterogeneity throughout the ridge system by deep crustal faults and their resultant tectonic valleys, which result in existence of different types of hydrothermal vent fields. Therefore, examining MAR opens a gate to understand the concentration ranges of ecosystem- limiting metals emanating from compositionally distinct hydrothermal settings for both near-field chemosynthetic ecosystems and far-field transport into the ocean int...
GEOCHEMISTRY OF DEEP-SEA HYDROTHERMAL VENT FLUIDS FROM BROKEN SPUR, RAINBOW AND LOST CITY HYDROTHERMAL VENT FIELDS, MID-ATLANTIC RIDGE
Sevgen, Serhat; Yücel, Mustafa; Department of Oceanography (2021-5-21)
Mid- Atlantic Ridge (MAR) is a very special tectonic environment which contains compositioanlly distinct hydrothermal vent fields as a result of its slow spreading character. Considering the increasing efforts on understanding the role of hydrothermal vents in both local and global ocean system, MAR enables to develop a wholistic approach to study formation, evolution and near field transportation of hydrothermal vent products in different vent fields at the same time. Here we present our results obtained f...
Measurement and evaluation of the hydrodynamics and secondary currents in and near a strait connecting large water bodies - A field study
Gueler, Isikhan; Yueksel, Yalcin; Yalçıner, Ahmet Cevdet; Cevik, Esin; Ingerslev, Christian (Elsevier BV, 2006-09-01)
The straits connect two large water bodies show highly strong and stratified currents related to meteorological, morphological and hydrodynamic conditions. In some cases, spatial and temporal changes of the stratified currents and their thickness, direction and magnitude are so complex. This complexity directly affects the circulation pattern in the region, water exchange between both ends of the straits and migration of fish species. In order to understand general characteristics of this kind of straits an...
Temporal trends in vent fluid iron and sulfide chemistry following the 2005/2006 eruption at East Pacific Rise, 9 degrees 50 ' N
Yücel, Mustafa (2013-04-01)
The chemistry of vent fluids that emanate to the seafloor undergoes dramatic changes after volcanic eruptions. Data on these changes are still limited, but the best studied example is the East Pacific Rise (EPR) at 9 degrees 50N, where the temporal evolution of the vent fluid chemistry after the 1991/1992 eruption was documented. The area underwent another eruption sequence during late 2005/early 2006, and here we show that a similar evolution is recurring in the iron and sulfide contents of the high-temper...
Hydrothermal energy transfer and organic carbon production at the deep seafloor
LE BRİS, Nadine; Yücel, Mustafa; DAS, Anindita; Sievert, Stefan M.; LokaBharathi, PonnaPakkam; Girguis, Peter R. (2019-01-18)
In just four decades, hundreds of hydrothermal vent fields have been discovered, widely distributed along tectonic plate boundaries on the ocean floor. Vent invertebrate biomass reaching up to tens of kilograms per square meter has attracted attention as a potential contributor to the organic carbon pool available in the resource-limited deep sea. But the rate of chemosynthetic production of organic carbon at deep-sea hydrothermal vents is highly variable and still poorly constrained. Despite the advent of ...
Citation Formats
M. Yücel and N. Le Bris, “Soluble, Colloidal, and Particulate Iron Across the Hydrothermal Vent Mixing Zones in Broken Spur and Rainbow, Mid-Atlantic Ridge,” FRONTIERS IN MICROBIOLOGY, vol. 12, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/94666.