Contourite depositional system on the Argentine Slope: An exceptional record of the influence of Antarctic water masses

Hernández-Molina, F. Javier; Paterlini, Marcelo; Violante, Roberto A.; Marshall, P. S.; Isasi, M. de; Somoza, Luı́s; Rebesco, Michele

doi:10.1130/g25578a.1

Cited by 162 publications

(172 citation statements)

References 6 publications

Supporting

Mentioning

151

Contrasting

Unclassified

Order By: Relevance

“…Piola and Matano (2001) (Flood and Shor, 1988;Hernández-Molina et al, 2009. In our area of investigation only the Falkland/Malvinas Current and associated water masses (AAIW and UCDW) have played and are playing a major role in the creation of the morphology of the Patagonian continental slope.…”

Section: Oceanographic Settingmentioning

confidence: 99%

See 1 more Smart Citation

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Muñoz¹,

Acosta²,

Cristobo³

et al. 2013

Earth-Science Reviews

View full text Add to dashboard Cite

Section: Oceanographic Settingmentioning

confidence: 99%

“…2B). A terrace, the Ewing Terrace (Hernández- Molina et al, 2009Molina et al, , 2010 links two tributaries of Canyon 6 at the base of the upper slope (Fig. 2B).…”

Section: Continental Slopementioning

confidence: 99%

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Muñoz¹,

Acosta²,

Cristobo³

et al. 2013

Earth-Science Reviews

View full text Add to dashboard Cite

“…The sedimentary environment of the Argentine Basin, including the continental margin off Argentina and Uruguay (Figure 1), is controlled by dynamic depositional processes, such as gravity-controlled sediment transport and strong current circulation (Ewing and Leonardi, 1971;Klaus and Ledbetter, 1988;Hernández-Molina et al, 2009;Preu et al, 2013). In the upper waters, the southward flowing Brazil Current and the northward flowing Malvinas (Falkland) Current meet in front of the Rio de la Plata (Peterson and Stramma, 1991).…”

Section: Sedimentary Settingmentioning

confidence: 99%

Sulfur Cycling in an Iron Oxide-Dominated, Dynamic Marine Depositional System: The Argentine Continental Margin

Riedinger

Brunner

Krastel³

et al. 2017

Front. Earth Sci.

View full text Add to dashboard Cite

The interplay between sediment deposition patterns, organic matter type and the quantity and quality of reactive mineral phases determines the accumulation, speciation, and isotope composition of pore water and solid phase sulfur constituents in marine sediments. Here, we present the sulfur geochemistry of siliciclastic sediments from two sites along the Argentine continental slope-a system characterized by dynamic deposition and reworking, which result in non-steady state conditions. The two investigated sites have different depositional histories but have in common that reactive iron phases are abundant and that organic matter is refractory-conditions that result in low organoclastic sulfate reduction rates (SRR). Deposition of reworked, isotopically light pyrite and sulfurized organic matter appear to be important contributors to the sulfur inventory, with only minor addition of pyrite from organoclastic sulfate reduction above the sulfate-methane transition (SMT). Pore-water sulfide is limited to a narrow zone at the SMT. The core of that zone is dominated by pyrite accumulation. Iron monosulfide and elemental sulfur accumulate above and below this zone. Iron monosulfide precipitation is driven by the reaction of low amounts of hydrogen sulfide with ferrous iron and is in competition with the oxidation of sulfide by iron (oxyhydr)oxides to form elemental sulfur. The intervals marked by precipitation of intermediate sulfur phases at the margin of the zone with free sulfide are bordered by two distinct peaks in total organic sulfur (TOS).Organic matter sulfurization appears to precede pyrite formation in the iron-dominated margins of the sulfide zone, potentially linked to the presence of polysulfides formed by reaction between dissolved sulfide and elemental sulfur. Thus, SMTs can be hotspots for organic matter sulfurization in sulfide-limited, reactive iron-rich marine sedimentary systems. Furthermore, existence of elemental sulfur and iron monosulfide phases meters below the SMT demonstrates that in sulfide-limited systems metastable sulfur constituents are not readily converted to pyrite but can be buried to deeper Riedinger et al.Non-steady State Subsurface Sulfur Cycling sediment depths. Our data show that in non-steady state systems, redox zones do not occur in sequence but can reappear or proceed in inverse sequence throughout the sediment column, causing similar mineral alteration processes to occur at the same time at different sediment depths.

show abstract

“…However, a number of papers published since 2009 reported new high-resolution and/or multichannel seismic surveys (Fig. 4), often combined with multi-beam bathymetric data, which show the common occurrence of layered sediments and prominent sediment drifts on the Argentine and adjacent Uruguayan margins (e.g., Hernández-Molina et al, 2009Violante et al, 2010, Krastel et al, 2011Lastras et al, 2011;Muñoz et al, 2012;Grützner et al, 2011Grützner et al, , 2012Grützner et al, , 2016Preu et al, 2012Preu et al, , 2013Voigt et al, 2013;Uenzelmann-Neben et al, 2016; see also Hinz et al, 1999). There has also been significant progress studying the climatic records in surficial and near-surface sediments recovered in sediment cores from the Argentine margin (e.g., Chiessi et al, 2007;Bozzano et al, 2011;Govin et al, 2012;Bender et al, 2013;Razik et al, 2013;Razik, 2014;García Chapori et al, 2014, demonstrating that this margin also contains important modern sedimentary deposits.…”

Section: Background and Geological Settingmentioning

confidence: 99%

“…Climate deterioration continued into the late Miocene, leading to the initiation and growth of the West Antarctic Ice Sheet (Shevenell et al, 2004). Climatic deterioration has continued into the Pleistocene although the major current systems that were established between the end of the Miocene and the late Pliocene appear to have continued to the present day (Hernández-Molina et al, 2009;Preu et al, 2012Preu et al, , 2013. However, factors other than ocean currents have also been important to the development of the margin, including sea level change, climate variability and glaciation and uplift in the Andes Grützner et al, 2011 and.…”

Section: R D Flood Et Al: Argentine Continental Marginmentioning

confidence: 99%

IODP workshop: developing scientific drilling proposals for the Argentina Passive Volcanic Continental Margin (APVCM) – basin evolution, deep biosphere, hydrates, sediment dynamics and ocean evolution

et al. 2017

Self Cite

View full text Add to dashboard Cite

Abstract. The Argentine margin contains important sedimentological, paleontological and chemical records of regional and local tectonic evolution, sea level, climate evolution and ocean circulation since the opening of the South Atlantic in the Late Jurassic-Early Cretaceous as well as the present-day results of post-depositional chemical and biological alteration. Despite its important location, which underlies the exchange of southern-and northern-sourced water masses, the Argentine margin has not been investigated in detail using scientific drilling techniques, perhaps because the margin has the reputation of being erosional. However, a number of papers published since 2009 have reported new high-resolution and/or multichannel seismic surveys, often combined with multi-beam bathymetric data, which show the common occurrence of layered sediments and prominent sediment drifts on the Argentine and adjacent Uruguayan margins. There has also been significant progress in studying the climatic records in surficial and near-surface sediments recovered in sediment cores from the Argentine margin. Encouraged by these recent results, our 3.5-day IODP (International Ocean Discovery Program) workshop in Buenos Aires (8-11 September 2015) focused on opportunities for scientific drilling on the Atlantic margin of Argentina, which lies beneath a key portion of the global ocean conveyor belt of thermohaline circulation. Significant opportunities exist to study the tectonic evolution, paleoceanography and stratigraphy, sedimentology, and biosphere and geochemistry of this margin.

show abstract

Contourite depositional system on the Argentine Slope: An exceptional record of the influence of Antarctic water masses

Cited by 162 publications

References 6 publications

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Geomorphology and shallow structure of a segment of the Atlantic Patagonian margin

Sulfur Cycling in an Iron Oxide-Dominated, Dynamic Marine Depositional System: The Argentine Continental Margin

IODP workshop: developing scientific drilling proposals for the Argentina Passive Volcanic Continental Margin (APVCM) – basin evolution, deep biosphere, hydrates, sediment dynamics and ocean evolution

Contact Info

Product

Resources

About