Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments
A bstract : Oxygen isotopic fractionation between gas hydrate and ambient water is determined as α GH‐IW = 1.0037 at 12–16°C and 31 Mpa, on the basis of direct measurements of gas hydrate‐derived waters and ambient pore waters recovered from the Blake Ridge during ODP Leg 164. Oxygen isotopic anomal...
Published in: | Annals of the New York Academy of Sciences |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley
2000
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1111/j.1749-6632.2000.tb06758.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1749-6632.2000.tb06758.x https://nyaspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1749-6632.2000.tb06758.x |
id |
crwiley:10.1111/j.1749-6632.2000.tb06758.x |
---|---|
record_format |
openpolar |
spelling |
crwiley:10.1111/j.1749-6632.2000.tb06758.x 2023-12-03T10:25:48+01:00 Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments MATSUMOTO, RYO 2000 http://dx.doi.org/10.1111/j.1749-6632.2000.tb06758.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1749-6632.2000.tb06758.x https://nyaspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1749-6632.2000.tb06758.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Annals of the New York Academy of Sciences volume 912, issue 1, page 39-50 ISSN 0077-8923 1749-6632 History and Philosophy of Science General Biochemistry, Genetics and Molecular Biology General Neuroscience journal-article 2000 crwiley https://doi.org/10.1111/j.1749-6632.2000.tb06758.x 2023-11-09T14:35:59Z A bstract : Oxygen isotopic fractionation between gas hydrate and ambient water is determined as α GH‐IW = 1.0037 at 12–16°C and 31 Mpa, on the basis of direct measurements of gas hydrate‐derived waters and ambient pore waters recovered from the Blake Ridge during ODP Leg 164. Oxygen isotopic anomalies give us the amount of gas hydrate of 7 to 9% (pore filling), which is almost twice as much as estimates from chloride anomalies. The difference is probably due to uncertainties in determining base‐line profiles of the in situ pristine pore waters, and partially due to the effects of selective filtration/adsorption during pore water extraction. Two 250 meter‐deep holes were drilled in the eastern Nankai trough off central Japan at a water depth of 950 m, where strong BSRs occur at about 300 mbsf. Massive hydrates were not recovered during this drilling but a number of soupy horizons suggest the existence of subsurface gas hydrate. Chloride concentration and δ 18 O of interstitial waters are observed to vary in a remarkable zigzag pattern with spiky anomalies, reflecting hydrate dissociation during core‐recovery and water extraction. The concentration of gas hydrate in sediments is estimated to be about 3–7% with a spiky maximum value of 30% from chloride anomalies and between 5 and 30% from δ 18 O anomalies. Significant difference in vertical distribution between nearby two holes in Nankai Trough probably reflect heterogeneous fluid migration through particular conduits in an accretionary wedge. Article in Journal/Newspaper Methane hydrate Wiley Online Library (via Crossref) Annals of the New York Academy of Sciences 912 1 39 50 |
institution |
Open Polar |
collection |
Wiley Online Library (via Crossref) |
op_collection_id |
crwiley |
language |
English |
topic |
History and Philosophy of Science General Biochemistry, Genetics and Molecular Biology General Neuroscience |
spellingShingle |
History and Philosophy of Science General Biochemistry, Genetics and Molecular Biology General Neuroscience MATSUMOTO, RYO Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
topic_facet |
History and Philosophy of Science General Biochemistry, Genetics and Molecular Biology General Neuroscience |
description |
A bstract : Oxygen isotopic fractionation between gas hydrate and ambient water is determined as α GH‐IW = 1.0037 at 12–16°C and 31 Mpa, on the basis of direct measurements of gas hydrate‐derived waters and ambient pore waters recovered from the Blake Ridge during ODP Leg 164. Oxygen isotopic anomalies give us the amount of gas hydrate of 7 to 9% (pore filling), which is almost twice as much as estimates from chloride anomalies. The difference is probably due to uncertainties in determining base‐line profiles of the in situ pristine pore waters, and partially due to the effects of selective filtration/adsorption during pore water extraction. Two 250 meter‐deep holes were drilled in the eastern Nankai trough off central Japan at a water depth of 950 m, where strong BSRs occur at about 300 mbsf. Massive hydrates were not recovered during this drilling but a number of soupy horizons suggest the existence of subsurface gas hydrate. Chloride concentration and δ 18 O of interstitial waters are observed to vary in a remarkable zigzag pattern with spiky anomalies, reflecting hydrate dissociation during core‐recovery and water extraction. The concentration of gas hydrate in sediments is estimated to be about 3–7% with a spiky maximum value of 30% from chloride anomalies and between 5 and 30% from δ 18 O anomalies. Significant difference in vertical distribution between nearby two holes in Nankai Trough probably reflect heterogeneous fluid migration through particular conduits in an accretionary wedge. |
format |
Article in Journal/Newspaper |
author |
MATSUMOTO, RYO |
author_facet |
MATSUMOTO, RYO |
author_sort |
MATSUMOTO, RYO |
title |
Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
title_short |
Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
title_full |
Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
title_fullStr |
Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
title_full_unstemmed |
Methane Hydrate Estimates from the Chloride and Oxygen Isotopic Anomalies: Examples from the Blake Ridge and Nankai Trough Sediments |
title_sort |
methane hydrate estimates from the chloride and oxygen isotopic anomalies: examples from the blake ridge and nankai trough sediments |
publisher |
Wiley |
publishDate |
2000 |
url |
http://dx.doi.org/10.1111/j.1749-6632.2000.tb06758.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1749-6632.2000.tb06758.x https://nyaspubs.onlinelibrary.wiley.com/doi/pdf/10.1111/j.1749-6632.2000.tb06758.x |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
Annals of the New York Academy of Sciences volume 912, issue 1, page 39-50 ISSN 0077-8923 1749-6632 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1749-6632.2000.tb06758.x |
container_title |
Annals of the New York Academy of Sciences |
container_volume |
912 |
container_issue |
1 |
container_start_page |
39 |
op_container_end_page |
50 |
_version_ |
1784274851392913408 |