Overview of interstitial fluid and sediment geochemistry, Sites 1003-1007 (Bahamas Transect)

P. A. Kramer, Peter K Swart, E. H. De Carlo, N. H. Schovsbo

Research output: Contribution to journalArticle

15 Citations (Scopus)

Abstract

A review of interstitial water samples collected from Sites 1003-1007 of the Bahamas Transect along with a shore-based analysis of oxygen and carbon isotopes, minor and trace elements, and sediment chemistry are presented. Results indicate that the pore-fluid profiles in the upper 100 meters below seafloor (mbsf) are marked by shifts between 20 and 40 mbsf that are thought to be caused by changes in sediment reactivity, sedimentation rates, and the influence of strong bottom currents that have been active since the late Pliocene. Pore-fluid profiles in the lower Pliocene-Miocene sequences are dominated by diffusion and do not show significant evidence of subsurface advective flow. Deeper interstitial waters are believed to be the in situ fluids that have evolved through interaction with sediments and diffusion. Pore-fluid chemistry is strongly influenced by carbonate recrystallization processes. Increases in pore-fluid Cl- and Na+ with depth are interpreted to result mainly from carbonate remineralization reactions that are most active near the platform margin. A lateral gradient in detrital clay content observed along the transect, leads to an overall lower carbonate reactivity, and enhances preservation of metastable aragonite further away from the platform margin. Later stage burial diagenesis occurs at slow rates and is limited by the supply of reactive elements through diffusion.

Original languageEnglish (US)
Pages (from-to)179-195
Number of pages17
JournalProceedings of the Ocean Drilling Program: Scientific Results
Volume166
StatePublished - 2000

Fingerprint

transect
geochemistry
fluid
sediment
carbonate
porewater
Pliocene
seafloor
sediment chemistry
burial diagenesis
remineralization
bottom current
aragonite
sedimentation rate
carbon isotope
oxygen isotope
deep water
Miocene
trace element
clay

ASJC Scopus subject areas

  • Geology
  • Oceanography

Cite this

Overview of interstitial fluid and sediment geochemistry, Sites 1003-1007 (Bahamas Transect). / Kramer, P. A.; Swart, Peter K; De Carlo, E. H.; Schovsbo, N. H.

In: Proceedings of the Ocean Drilling Program: Scientific Results, Vol. 166, 2000, p. 179-195.

Research output: Contribution to journalArticle

@article{2aa8a54227724c6b8af1c5318d2866b4,
title = "Overview of interstitial fluid and sediment geochemistry, Sites 1003-1007 (Bahamas Transect)",
abstract = "A review of interstitial water samples collected from Sites 1003-1007 of the Bahamas Transect along with a shore-based analysis of oxygen and carbon isotopes, minor and trace elements, and sediment chemistry are presented. Results indicate that the pore-fluid profiles in the upper 100 meters below seafloor (mbsf) are marked by shifts between 20 and 40 mbsf that are thought to be caused by changes in sediment reactivity, sedimentation rates, and the influence of strong bottom currents that have been active since the late Pliocene. Pore-fluid profiles in the lower Pliocene-Miocene sequences are dominated by diffusion and do not show significant evidence of subsurface advective flow. Deeper interstitial waters are believed to be the in situ fluids that have evolved through interaction with sediments and diffusion. Pore-fluid chemistry is strongly influenced by carbonate recrystallization processes. Increases in pore-fluid Cl- and Na+ with depth are interpreted to result mainly from carbonate remineralization reactions that are most active near the platform margin. A lateral gradient in detrital clay content observed along the transect, leads to an overall lower carbonate reactivity, and enhances preservation of metastable aragonite further away from the platform margin. Later stage burial diagenesis occurs at slow rates and is limited by the supply of reactive elements through diffusion.",
author = "Kramer, {P. A.} and Swart, {Peter K} and {De Carlo}, {E. H.} and Schovsbo, {N. H.}",
year = "2000",
language = "English (US)",
volume = "166",
pages = "179--195",
journal = "Proceedings of the Ocean Drilling Program: Scientific Results",
issn = "0884-5891",
publisher = "Texas A & M University",

}

TY - JOUR

T1 - Overview of interstitial fluid and sediment geochemistry, Sites 1003-1007 (Bahamas Transect)

AU - Kramer, P. A.

AU - Swart, Peter K

AU - De Carlo, E. H.

AU - Schovsbo, N. H.

PY - 2000

Y1 - 2000

N2 - A review of interstitial water samples collected from Sites 1003-1007 of the Bahamas Transect along with a shore-based analysis of oxygen and carbon isotopes, minor and trace elements, and sediment chemistry are presented. Results indicate that the pore-fluid profiles in the upper 100 meters below seafloor (mbsf) are marked by shifts between 20 and 40 mbsf that are thought to be caused by changes in sediment reactivity, sedimentation rates, and the influence of strong bottom currents that have been active since the late Pliocene. Pore-fluid profiles in the lower Pliocene-Miocene sequences are dominated by diffusion and do not show significant evidence of subsurface advective flow. Deeper interstitial waters are believed to be the in situ fluids that have evolved through interaction with sediments and diffusion. Pore-fluid chemistry is strongly influenced by carbonate recrystallization processes. Increases in pore-fluid Cl- and Na+ with depth are interpreted to result mainly from carbonate remineralization reactions that are most active near the platform margin. A lateral gradient in detrital clay content observed along the transect, leads to an overall lower carbonate reactivity, and enhances preservation of metastable aragonite further away from the platform margin. Later stage burial diagenesis occurs at slow rates and is limited by the supply of reactive elements through diffusion.

AB - A review of interstitial water samples collected from Sites 1003-1007 of the Bahamas Transect along with a shore-based analysis of oxygen and carbon isotopes, minor and trace elements, and sediment chemistry are presented. Results indicate that the pore-fluid profiles in the upper 100 meters below seafloor (mbsf) are marked by shifts between 20 and 40 mbsf that are thought to be caused by changes in sediment reactivity, sedimentation rates, and the influence of strong bottom currents that have been active since the late Pliocene. Pore-fluid profiles in the lower Pliocene-Miocene sequences are dominated by diffusion and do not show significant evidence of subsurface advective flow. Deeper interstitial waters are believed to be the in situ fluids that have evolved through interaction with sediments and diffusion. Pore-fluid chemistry is strongly influenced by carbonate recrystallization processes. Increases in pore-fluid Cl- and Na+ with depth are interpreted to result mainly from carbonate remineralization reactions that are most active near the platform margin. A lateral gradient in detrital clay content observed along the transect, leads to an overall lower carbonate reactivity, and enhances preservation of metastable aragonite further away from the platform margin. Later stage burial diagenesis occurs at slow rates and is limited by the supply of reactive elements through diffusion.

UR - http://www.scopus.com/inward/record.url?scp=0033844854&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033844854&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0033844854

VL - 166

SP - 179

EP - 195

JO - Proceedings of the Ocean Drilling Program: Scientific Results

JF - Proceedings of the Ocean Drilling Program: Scientific Results

SN - 0884-5891

ER -