Show simple item record

dc.contributor.advisorWood, Lesli J.
dc.contributor.authorBeelen, Daan
dc.contributor.committeememberSarg, J. F. (J. Frederick)
dc.contributor.committeememberCarr, Mary
dc.contributor.committeememberPlink-Björklund, Piret
dc.contributor.committeememberSnieder, Roel, 1958-
dc.date.accessioned2021-09-13T10:22:19Z
dc.date.available2022-09-10T10:22:19Z
dc.date.issued2021
dc.descriptionIncludes bibliographical references.
dc.description2021 Summer.
dc.description.abstractThis doctoral thesis (this work) is aimed at better understanding ocean bottom current processes and their bedforms in the contexts of 1) ancient outcrops, 2) modern oceans and 3) geophysical bedform processes. First, Miocene Rifian Corridor deposits in Northern Morocco are described, which have been interpreted to have formed under the action of ocean bottom currents. The independent paleontological, sedimentary, and stratigraphic analysis presented in this work shows that these deposits have likely been misinterpreted and actually represent shallow marine tide-dominated delta deposits. The implications of these findings to our understanding of ancient bottom current deposits in an outcrop are discussed and independent interpretations for these sediments are outlined. Second, the abyssal plain geomorphologies are compiled and analyzed to illustrate the bedform types and the diversity of ocean bottom current-controlled landscapes. This work shows that ocean bottom current deposits comprise mostly of migrating dunes and have morphological, sedimentological, and process similarities to aeolian deposits. Compiled abyssal dune data is then used to develop a global map with regions of ocean bottom deposition, erosion, and stasis. A separate chapter of this work discusses the use of ocean floor sediment core to quantify the origin of oceanic sediments, and documents that on average ± 8% of the sediments on the ocean floor are derived from authigenic suspension fallout, as compared to ± 92% that is detrital sediment derived from continental sources. The final two chapters of this work examine active aeolian systems to define physical laws of dune formation and migration, showing that the shapes and migration rates of dunes are controlled by surface-to-volume ratios. These laws are then applied to better understand the role of topography on dune morphology transitions.
dc.format.mediumborn digital
dc.format.mediumdoctoral dissertations
dc.identifierBeelen_mines_0052E_12246.pdf
dc.identifierT 9204
dc.identifier.urihttps://hdl.handle.net/11124/176538
dc.languageEnglish
dc.publisherColorado School of Mines. Arthur Lakes Library
dc.relation.ispartof2021 - Mines Theses & Dissertations
dc.rightsCopyright of the original work is retained by the author.
dc.rights.accessEmbargo Expires: 09/10/2022
dc.subjectbottom current
dc.subjectdune
dc.subjecttide-dominated delta
dc.subjectcontourite
dc.subjectabyssal plain
dc.subjectthermohaline circulation
dc.titleSedimentology of bottom current processes and their bedforms, The
dc.typeText
dcterms.embargo.expires2022-09-10
thesis.degree.disciplineGeology and Geological Engineering
thesis.degree.grantorColorado School of Mines
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy (Ph.D.)


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record