NDLI: Computer simulation of deep sulfate reduction in sediments of the Amazon Fan

Please wait, while we are loading the content...

Implications for focused fluid transport at the northern Cascadia accretionary prism from a correlation between BSR occurrence a d near-sea-floor reflectivity anomalies imaged in a multi-frequency seismic data set

Spatial distribution of the calcareous dinoflagellate Thoracosphaera heimii in the upper water column of the tropical and equatorial Atlantic

Reconstruction of palaeoceanographic conditions in the South Atlantic Ocean at the last two Terminations based on calcareous dinoflagellate cysts

Distribution of calcareous dinoflagellates from the Maastrichtian to early Miocene of DSDP Site 357 (Rio Grande Rise, western South Atlantic Ocean)

Slope sediments of a Paleocene ramp-to-basin transition in NE Egypt

Monitoring climate variability over the past 116 years in coral oxygen isotopes from Ningaloo Reef, Western Australia

North Atlantic climate variability since AD 1350 recorded in δ 18O and skeletal density of Bermuda corals

Mid-Holocene stable isotope record of corals from the northern Red Sea

What factors control mechanical erosion rates?

Geochemistry, petrogenesis and tectonic setting of late Neoproterozoic Dokhan-type volcanic rocks in the Fatira area, eastern Egypt

Pan-African granulite formation in the Kabye Massif of northern Togo (West Africa): Pb−Pb zircon ages

Zircon ages and Nd isotopic and chemical compositions of orthogneisses from the Black Forest, Germany: evidence for a Cambrian magmatic arc

Microstructural evolution and geologic significance of garnet pyriclasites in the Hoher-Bogen shear zone (Bohemian Massif, Germany)

U–Pb geochronology of the Southern Black Forest Batholith (Central Variscan Belt): timing of exhumation and granite emplacement

Aligned fractures in carbonate rocks: laboratory and in situ measurements of seismic anisotropy

Iridium and the K/T boundary at El Caribe, Guatemala

Dokumente zur Ära Heinrich von Dechen (1800–1898) – Seine geologischen Übersichtskarten

Hans Cloos (1885–1951) /Dokumente aus seinem Leben

International Journal of Earth Sciences : Volume 88, Issue 3, October 1999

International Journal of Earth Sciences : Volume 88, Issue 2, August 1999

International Journal of Earth Sciences : Volume 88, Issue 1, May 1999

International Journal of Earth Sciences : Volume 87

International Journal of Earth Sciences : Volume 86

Computer simulation of deep sulfate reduction in sediments of the Amazon Fan

Content Provider	Springer Nature Link
Author	Adler, M. Hensen, C. Kasten, S. Schulz, H. D.
Copyright Year	2000
Abstract	Pore water concentration profiles of sediments at a site on the Amazon Fan were investigated and simulated with the numerical model CoTReM (column transport and reaction model) to reveal the biogeochemical processes involved. The pore water profiles for gravity core GeoB 4417-7 showed a distinct sulfate–methane transition zone in which deep sulfate reduction occurs. Only a small sulfide peak could be observed at the reaction zone. Due to high amounts of iron minerals, the produced sulfide is instantaneously precipitated in form of iron sulfides. We present a simulation which starts from a steady state system with respect to pore water profiles for methane and sulfate. Furthermore, sulfide, iron, pH, pE, calcium and total inorganic carbon (TIC) were included in the simulation. The program calculated mineral equilibria to mackinawite, iron sulfides (more stable than mackinawite), iron hydroxides and calcite via saturation indices (SI) by a module incorporating the program PHREEQC (Parkhurst 1995). The measured sulfide and iron profiles are obtained in the simulation output by using a constant SI (=0) for mackinawite and calcite, while a depth dependent SI distribution is applied for the PHREEQC phases “Pyrite” and “Fe(OH)3(a)”, representing a composition and the kinetics of different iron sulfides and iron hydroxides. These SI distributions control the results of sulfide and iron pore water profiles, especially conserving the sulfide profile at the reaction zone during the simulation. The results suggest that phases of iron hydroxides are dissolved, mackinawite is precipitated within, and other iron sulfides are precipitated below the reaction zone. The chemical reactivity of iron hydroxides corresponds to the rate of sulfide production. The system H2O–CO2–CaCO3 is generally successfully maintained during the simulation. Deviations to the measured pH profile suggest that further processes are active which are not included in the simulation yet.
Starting Page	641
Ending Page	654
Page Count	14
File Format	PDF
ISSN	14373254
Journal	International Journal of Earth Sciences
Volume Number	88
Issue Number	4
e-ISSN	14373262
Language	English
Publisher	Springer-Verlag
Publisher Date	2000-03-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Content Type	Text
Resource Type	Article
Subject	Earth and Planetary Sciences

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

Quantifying the sources of dissolved inorganic carbon within the sulfate-methane transition zone in nearshore sediments of Qi’ao Island, Pearl River Estuary, Southern China

Native minerals and intermetallides of noble and nonferrous metals in sediments of the Markov Deep, Mid-Atlantic Ridge

Variations of pore water sulfate gradients in sediments as indicator for underlying gas hydrate in Shenhu Area, the South China Sea

Elemental sulfur in northern South China Sea sediments and its significance

Web-oriented GIS system for monitoring, conservation and law enforcement of the Brazilian Amazon

Preliminary results of the study of deep-sea sediments from the North Pole

Khvalynian sediments of the Manych Depression

Experimental simulation of gas hydrate decomposition in porous sediment

A Calciosolenia brasiliensis (Coccolithophorida) find in neogene sediments of a deep Black Sea basin and its connection with the Mediterranean

Computer simulation of deep sulfate reduction in sediments of the Amazon Fan

Similar Documents

Quantifying the sources of dissolved inorganic carbon within the sulfate-methane transition zone in nearshore sediments of Qi’ao Island, Pearl River Estuary, Southern China

Native minerals and intermetallides of noble and nonferrous metals in sediments of the Markov Deep, Mid-Atlantic Ridge

Variations of pore water sulfate gradients in sediments as indicator for underlying gas hydrate in Shenhu Area, the South China Sea

Elemental sulfur in northern South China Sea sediments and its significance

Web-oriented GIS system for monitoring, conservation and law enforcement of the Brazilian Amazon

Preliminary results of the study of deep-sea sediments from the North Pole

Khvalynian sediments of the Manych Depression

Experimental simulation of gas hydrate decomposition in porous sediment

A Calciosolenia brasiliensis (Coccolithophorida) find in neogene sediments of a deep Black Sea basin and its connection with the Mediterranean

Computer simulation of deep sulfate reduction in sediments of the Amazon Fan