Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007
Massive clinoptilolite authigenesis was observed at about 1105 meters below sea floor (mbsf) in lower Miocene wellcompacted carbonate periplatform sediments from the Great Bahama Bank [Ocean Drilling Program, ODP Leg 166, Site 1007]. The diagenetic assemblage comprises abundant zeolite crystallized...
Main Authors: | , , |
---|---|
Format: | Dataset |
Language: | English |
Published: |
PANGAEA
2007
|
Subjects: | |
Online Access: | https://doi.pangaea.de/10.1594/PANGAEA.705525 https://doi.org/10.1594/PANGAEA.705525 |
id |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.705525 |
---|---|
record_format |
openpolar |
spelling |
ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.705525 2023-05-15T17:37:02+02:00 Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 Karpoff, Anne Marie Destrigneville, Christine Stille, Peter MEDIAN LATITUDE: 24.504225 * MEDIAN LONGITUDE: -79.322475 * SOUTH-BOUND LATITUDE: 24.504200 * WEST-BOUND LONGITUDE: -79.322500 * NORTH-BOUND LATITUDE: 24.504400 * EAST-BOUND LONGITUDE: -79.322300 * DATE/TIME START: 1996-03-29T06:30:00 * DATE/TIME END: 1996-04-08T15:18:00 2007-10-13 application/zip, 4 datasets https://doi.pangaea.de/10.1594/PANGAEA.705525 https://doi.org/10.1594/PANGAEA.705525 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.705525 https://doi.org/10.1594/PANGAEA.705525 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Karpoff, Anne Marie; Destrigneville, Christine; Stille, Peter (2007): Clinoptilolite as a new proxy of enhanced biogenic silica productivity in lower Miocene carbonate sediments of the Bahamas platform: Isotopic and thermodynamic evidence. Chemical Geology, 245(3-4), 285-304, https://doi.org/10.1016/j.chemgeo.2007.08.011 166-1007B 166-1007C DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP Dataset 2007 ftpangaea https://doi.org/10.1594/PANGAEA.705525 https://doi.org/10.1016/j.chemgeo.2007.08.011 2023-01-20T07:31:14Z Massive clinoptilolite authigenesis was observed at about 1105 meters below sea floor (mbsf) in lower Miocene wellcompacted carbonate periplatform sediments from the Great Bahama Bank [Ocean Drilling Program, ODP Leg 166, Site 1007]. The diagenetic assemblage comprises abundant zeolite crystallized within foraminifer tests and sedimentary matrix, as well as Mg smectites. In carbonate-rich deposits, the formation of the zeolite requires a supply of silica. Thus, the objective of the study is to determine the origin of the silica supply, its diagenetic evolution, and consequently the related implications on interpretation of the sedimentary record, in terms of local or global paleoceanographic change. For lack of evidence for any volcaniclastic input or traces of Si-enriched deep fluids circulation, an in situ biogenic source of silica is validated by isotopic data and chemical modeling for the formation of such secondary minerals in shallow-water carbonate sequences. Geochemical and strontium isotopic data clearly establish the marine signature of the diagenetic zeolite, as well as its contemporaneous formation with the carbonate deposition (Sr model ages of 19.6-23.2 Ma). The test of saturation for the pore fluids specifies the equilibrium state of the present mineralogical assemblage. Seawater-rock modeling specifies that clinoptilolite precipitates from the dissolution of biogenic silica, which reacts with clay minerals. The amount of silica (opal-A) involved in the reaction has to be significant enough, at least 10 wt.%, to account for the observed content of clinoptilolite occurring at the most zeolite-rich level. Modeling also shows that the observed amount of clinoptilolite (~19%) reflects an in situ and short-term reaction due to the high reactivity of primary biogenic silica (opal-A) until its complete depletion. The episodic occurrence of these well-lithified zeolite-rich levels is consistent with the occurrence of seismic reflectors, particularly the P2 seismic sequence boundary located at 1115 mbsf ... Dataset North Atlantic PANGAEA - Data Publisher for Earth & Environmental Science ENVELOPE(-79.322500,-79.322300,24.504400,24.504200) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
166-1007B 166-1007C DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP |
spellingShingle |
166-1007B 166-1007C DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP Karpoff, Anne Marie Destrigneville, Christine Stille, Peter Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
topic_facet |
166-1007B 166-1007C DRILL Drilling/drill rig Joides Resolution Leg166 North Atlantic Ocean Ocean Drilling Program ODP |
description |
Massive clinoptilolite authigenesis was observed at about 1105 meters below sea floor (mbsf) in lower Miocene wellcompacted carbonate periplatform sediments from the Great Bahama Bank [Ocean Drilling Program, ODP Leg 166, Site 1007]. The diagenetic assemblage comprises abundant zeolite crystallized within foraminifer tests and sedimentary matrix, as well as Mg smectites. In carbonate-rich deposits, the formation of the zeolite requires a supply of silica. Thus, the objective of the study is to determine the origin of the silica supply, its diagenetic evolution, and consequently the related implications on interpretation of the sedimentary record, in terms of local or global paleoceanographic change. For lack of evidence for any volcaniclastic input or traces of Si-enriched deep fluids circulation, an in situ biogenic source of silica is validated by isotopic data and chemical modeling for the formation of such secondary minerals in shallow-water carbonate sequences. Geochemical and strontium isotopic data clearly establish the marine signature of the diagenetic zeolite, as well as its contemporaneous formation with the carbonate deposition (Sr model ages of 19.6-23.2 Ma). The test of saturation for the pore fluids specifies the equilibrium state of the present mineralogical assemblage. Seawater-rock modeling specifies that clinoptilolite precipitates from the dissolution of biogenic silica, which reacts with clay minerals. The amount of silica (opal-A) involved in the reaction has to be significant enough, at least 10 wt.%, to account for the observed content of clinoptilolite occurring at the most zeolite-rich level. Modeling also shows that the observed amount of clinoptilolite (~19%) reflects an in situ and short-term reaction due to the high reactivity of primary biogenic silica (opal-A) until its complete depletion. The episodic occurrence of these well-lithified zeolite-rich levels is consistent with the occurrence of seismic reflectors, particularly the P2 seismic sequence boundary located at 1115 mbsf ... |
format |
Dataset |
author |
Karpoff, Anne Marie Destrigneville, Christine Stille, Peter |
author_facet |
Karpoff, Anne Marie Destrigneville, Christine Stille, Peter |
author_sort |
Karpoff, Anne Marie |
title |
Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
title_short |
Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
title_full |
Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
title_fullStr |
Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
title_full_unstemmed |
Chemical and Sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from Lower Miocene sediments at ODP Site 166-1007 |
title_sort |
chemical and sr isotopic compositions of 3 step leachates and residues of bulk samples, zeolites, and smectites from lower miocene sediments at odp site 166-1007 |
publisher |
PANGAEA |
publishDate |
2007 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.705525 https://doi.org/10.1594/PANGAEA.705525 |
op_coverage |
MEDIAN LATITUDE: 24.504225 * MEDIAN LONGITUDE: -79.322475 * SOUTH-BOUND LATITUDE: 24.504200 * WEST-BOUND LONGITUDE: -79.322500 * NORTH-BOUND LATITUDE: 24.504400 * EAST-BOUND LONGITUDE: -79.322300 * DATE/TIME START: 1996-03-29T06:30:00 * DATE/TIME END: 1996-04-08T15:18:00 |
long_lat |
ENVELOPE(-79.322500,-79.322300,24.504400,24.504200) |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_source |
Supplement to: Karpoff, Anne Marie; Destrigneville, Christine; Stille, Peter (2007): Clinoptilolite as a new proxy of enhanced biogenic silica productivity in lower Miocene carbonate sediments of the Bahamas platform: Isotopic and thermodynamic evidence. Chemical Geology, 245(3-4), 285-304, https://doi.org/10.1016/j.chemgeo.2007.08.011 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.705525 https://doi.org/10.1594/PANGAEA.705525 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.705525 https://doi.org/10.1016/j.chemgeo.2007.08.011 |
_version_ |
1766136745646096384 |