NOTE: This item is not available outside the Texas A&M University network. Texas A&M affiliated users who are off campus can access the item through NetID and password authentication or by using TAMU VPN. Non-affiliated individuals should request a copy through their local library's interlibrary loan service.
Hydrothermal processes along mid-ocean ridges: an experimental investigation
dc.contributor.advisor | Scott, Robert B. | |
dc.creator | Hajash, Andrew | |
dc.date.accessioned | 2020-01-08T18:22:22Z | |
dc.date.available | 2020-01-08T18:22:22Z | |
dc.date.created | 1976 | |
dc.date.issued | 1975 | |
dc.identifier.uri | https://hdl.handle.net/1969.1/DISSERTATIONS-182868 | |
dc.description.abstract | An experimental investigation of high-temperature seawater/basalt interactions has been conducted in order to better evaluate the geochemical and economic implications of hydrothermal circulation of seawater in the oceanic crust along active mid-ocean ridges. The results indicate that, as seawater reacts with basalt between 200°C and 500°C at 500-800 bars, the fluid tends to change from an oxygenated, slightly alkaline, Na�, Mg��, SO₄[superscipt =], Cl� solution to a reducing, acidic, Na�, Ca��, Cl� solution with Fe, Mn and Cu concentrations up to 1500, 190 and 0.3 ppm respectively. Silica concentrations in the fluid approach saturation values with respect to quartz at all temperatures; however, Al abundances remain very low (~0.5 ppm). Montmorillonite, nontronite, albite, tremolite-actinolite, chalcopyrite, pyrrhotite and hematite were the dominant alteration products formed. These data imply that large-scale circulation of seawater in the oceanic crust could account for the Al-deficient metalliferous sediments associated with mid-ocean ridges and be important in the genesis of certain Fe-Cu sulfide ore deposits. The process could also affect the geochemical budgets of certain elements and exert substantial control on the steady-state composition of seawater by removing excess Na and Mg and adding Ca, Si and H to the oceans. | en |
dc.format.extent | 61 leaves : illustrations | en |
dc.format.medium | electronic | en |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | |
dc.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. | en |
dc.rights.uri | http://rightsstatements.org/vocab/InC/1.0/ | |
dc.subject | Geology | en |
dc.subject.classification | 1975 Dissertation H154 | |
dc.subject.lcsh | Hydrothermal deposits | en |
dc.title | Hydrothermal processes along mid-ocean ridges: an experimental investigation | en |
dc.type | Thesis | en |
thesis.degree.discipline | Geology | en |
thesis.degree.grantor | Texas A&M University | en |
thesis.degree.name | Doctor of Philosophy | en |
thesis.degree.level | Doctoral | en |
dc.contributor.committeeMember | Fahlquist, Davis A. | |
dc.contributor.committeeMember | Tieh, Thomas T. | |
dc.contributor.committeeMember | Presley, Bob J. | |
dc.contributor.committeeMember | Stern, David W. | |
dc.type.genre | dissertations | en |
dc.type.material | text | en |
dc.format.digitalOrigin | reformatted digital | en |
dc.publisher.digital | Texas A&M University. Libraries |
Files in this item
This item appears in the following Collection(s)
-
Digitized Theses and Dissertations (1922–2004)
Texas A&M University Theses and Dissertations (1922–2004)
Request Open Access
This item and its contents are restricted. If this is your thesis or dissertation, you can make it open-access. This will allow all visitors to view the contents of the thesis.