Deuterium variations in the Gulf of Mexico and selected organic materials
The variations of the stable isotopes of hydrogen (protium and deuterium) were determined in the various water masses of the Gulf of Mexico. Surface waters of the central Gulf were found to have an average δD = 5.6%, relative to SMOW. The deep water masses, Subtropical Underwater, Antarctic Interme...
Main Author: | |
---|---|
Other Authors: | , , |
Format: | Thesis |
Language: | English |
Published: |
Texas A&M University. Libraries
1972
|
Subjects: | |
Online Access: | https://hdl.handle.net/1969.1/DISSERTATIONS-183382 |
id |
fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/DISSERTATIONS-183382 |
---|---|
record_format |
openpolar |
spelling |
fttexasamuniv:oai:oaktrust.library.tamu.edu:1969.1/DISSERTATIONS-183382 2023-07-16T03:54:36+02:00 Deuterium variations in the Gulf of Mexico and selected organic materials Frank, Donald James Sackett, William M. Grigsby, Ronald D. Reid, Robert O. 1972 118 leaves electronic application/pdf reformatted digital https://hdl.handle.net/1969.1/DISSERTATIONS-183382 eng eng Texas A&M University. Libraries https://hdl.handle.net/1969.1/DISSERTATIONS-183382 This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ Chemical Oceanography 1972 Dissertation F828 Thesis dissertations text 1972 fttexasamuniv 2023-06-27T22:55:47Z The variations of the stable isotopes of hydrogen (protium and deuterium) were determined in the various water masses of the Gulf of Mexico. Surface waters of the central Gulf were found to have an average δD = 5.6%, relative to SMOW. The deep water masses, Subtropical Underwater, Antarctic Intermediate Water and Gulf Bottom Water, were found to be characterized by deuterium contents of 5.5, -0.5 and 0.9%, respectively. These values were found to be comparable with the δD values of these water masses in their source regions. The δD values for the fresh water contribution to the Gulf via the Mississippi and Coatzacoalcos Rivers were found to be -42.3%, and -19.3%, respectively. The value for the net fresh water addition to the Gulf was determined to be ~-33%. Using these values it is shown that the isotopic composition of near shore waters can be explained by a simple mixing model of fresh water from runoff and sea water modified by processes of advection. In addition, it is possible to follow the various water masses of the Gulf by their deuterium contents. Using an evaporation-precipitation model of the Gulf, the annual evaporation and precipitation were found to be 172 and 77 cm/y respectively. The hydrogen isotope fractionation during the thermal cracking of n-octadecane was studied in relation to previous studies of this system using carbon isotopes. The deuterium depletion in methane generated during pyrolysis was found to be -200, -139 and -86% at 630, 530 and 430°C respectively. It was shown that inverse isotope effects were probably responsible for the reversed temperature dependence observed. This and previous studies on the carbon isotope fractionation of this system suggest that the multiplicity of bond types available for breaking and formation and the isotopic fractionation associated with the cracking of decomposition products of the original hydrocarbon are primary factors in determining the isotopic composition of the methane produced. Samples of total plankton, plankton lipid and Euphausia ... Thesis Antarc* Antarctic Texas A&M University Digital Repository Antarctic |
institution |
Open Polar |
collection |
Texas A&M University Digital Repository |
op_collection_id |
fttexasamuniv |
language |
English |
topic |
Chemical Oceanography 1972 Dissertation F828 |
spellingShingle |
Chemical Oceanography 1972 Dissertation F828 Frank, Donald James Deuterium variations in the Gulf of Mexico and selected organic materials |
topic_facet |
Chemical Oceanography 1972 Dissertation F828 |
description |
The variations of the stable isotopes of hydrogen (protium and deuterium) were determined in the various water masses of the Gulf of Mexico. Surface waters of the central Gulf were found to have an average δD = 5.6%, relative to SMOW. The deep water masses, Subtropical Underwater, Antarctic Intermediate Water and Gulf Bottom Water, were found to be characterized by deuterium contents of 5.5, -0.5 and 0.9%, respectively. These values were found to be comparable with the δD values of these water masses in their source regions. The δD values for the fresh water contribution to the Gulf via the Mississippi and Coatzacoalcos Rivers were found to be -42.3%, and -19.3%, respectively. The value for the net fresh water addition to the Gulf was determined to be ~-33%. Using these values it is shown that the isotopic composition of near shore waters can be explained by a simple mixing model of fresh water from runoff and sea water modified by processes of advection. In addition, it is possible to follow the various water masses of the Gulf by their deuterium contents. Using an evaporation-precipitation model of the Gulf, the annual evaporation and precipitation were found to be 172 and 77 cm/y respectively. The hydrogen isotope fractionation during the thermal cracking of n-octadecane was studied in relation to previous studies of this system using carbon isotopes. The deuterium depletion in methane generated during pyrolysis was found to be -200, -139 and -86% at 630, 530 and 430°C respectively. It was shown that inverse isotope effects were probably responsible for the reversed temperature dependence observed. This and previous studies on the carbon isotope fractionation of this system suggest that the multiplicity of bond types available for breaking and formation and the isotopic fractionation associated with the cracking of decomposition products of the original hydrocarbon are primary factors in determining the isotopic composition of the methane produced. Samples of total plankton, plankton lipid and Euphausia ... |
author2 |
Sackett, William M. Grigsby, Ronald D. Reid, Robert O. |
format |
Thesis |
author |
Frank, Donald James |
author_facet |
Frank, Donald James |
author_sort |
Frank, Donald James |
title |
Deuterium variations in the Gulf of Mexico and selected organic materials |
title_short |
Deuterium variations in the Gulf of Mexico and selected organic materials |
title_full |
Deuterium variations in the Gulf of Mexico and selected organic materials |
title_fullStr |
Deuterium variations in the Gulf of Mexico and selected organic materials |
title_full_unstemmed |
Deuterium variations in the Gulf of Mexico and selected organic materials |
title_sort |
deuterium variations in the gulf of mexico and selected organic materials |
publisher |
Texas A&M University. Libraries |
publishDate |
1972 |
url |
https://hdl.handle.net/1969.1/DISSERTATIONS-183382 |
geographic |
Antarctic |
geographic_facet |
Antarctic |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
https://hdl.handle.net/1969.1/DISSERTATIONS-183382 |
op_rights |
This thesis was part of a retrospective digitization project authorized by the Texas A&M University Libraries. Copyright remains vested with the author(s). It is the user's responsibility to secure permission from the copyright holder(s) for re-use of the work beyond the provision of Fair Use. http://rightsstatements.org/vocab/InC/1.0/ |
_version_ |
1771540869425397760 |