Full Text Available
Note: Clicking the button above will open the full text document at the original institutional repository in a new window.
Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia
Thesis (MSc)--Stellenbosch University, 2024.
Saved in:
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Published: |
Stellenbosch : Stellenbosch University
2025
|
| Subjects: | |
| Tags: |
No Tags, Be the first to tag this record!
|
| _version_ | 1867613770949328896 |
|---|---|
| access_status_str | Open Access |
| author | Van Niekerk, Jesse Benjamin |
| author2 | Tucker, Ryan T. |
| author_browse | Tucker, Ryan T. Van Niekerk, Jesse Benjamin |
| author_facet | Tucker, Ryan T. Van Niekerk, Jesse Benjamin |
| author_sort | Van Niekerk, Jesse Benjamin |
| collection | Thesis |
| dc_rights_str_mv | Stellenbosch University |
| description | Thesis (MSc)--Stellenbosch University, 2024. |
| format | Thesis |
| id | oai:scholar.sun.ac.za:10019.1/131958 |
| institution | Stellenbosch University (South Africa) |
| last_indexed | 2026-06-10T12:41:25.747Z |
| license_str | Other — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from SUNScholar — Stellenbosch University Repository |
| publishDate | 2025 |
| publishDateRange | 2025 |
| publishDateSort | 2025 |
| publisher | Stellenbosch : Stellenbosch University |
| publisherStr | Stellenbosch : Stellenbosch University |
| record_format | dspace |
| source_str | SUNScholar — Stellenbosch University Repository |
| spelling | oai:scholar.sun.ac.za:10019.1/131958 Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia Van Niekerk, Jesse Benjamin Tucker, Ryan T. Stellenbosch University. Faculty of Science. Dept. of Earth Sciences. Sequence stratigraphy Geology, Structural -- Mongolia -- Eastern Gobi basin Paleontology Geology, Stratigraphic -- Cenozoic Geology, Stratigraphic -- Mesozoic Sedimentology -- Dzun Shakhai -- Shine Usny Tolgod UCTD Thesis (MSc)--Stellenbosch University, 2024. ENGLISH ABSTRACT: Late Jurassic to Early Cretaceous tectonics fragmented the Eastern Gobi Basin (EGB) into a series of isolated, but complex, and multi-phased sub-basins. This tectonic regime gave rise to an extensional rift (horst-graben) setting that experienced penecontemporaneous to asynchronous syn-rift sedimentary infill sequences. Situated in the northeast of the EGB, the Dzun Shakhai and Shine Usny Tolgod localities of the understudied Sainshand Sub-basin preserves a fairly continuous sequence of syn-rift deposits that likely span much of the Early Cretaceous. Numerous uncertainties pertaining to sub-basinal and basinal scale lithostratigraphic and biostratigraphic correlations within the EGB persist and thus hamper a holistic view of the landscape evolution of Early Cretaceous Mongolia. This study therefore sought to better contextualize the lithostratigraphic uncertainties that persist in the Sainshand Sub-basin while improving the stratigraphic framework by conducting a high-resolution facies and architectural element analyses that enabled the construction of palaeoenvironmental reconstructions. Additionally, a novel continental sequence stratigraphy model for the sub-basin was formulated to correlate to previously established continental sequence models in the adjacent Zuunbayan and Unegt Sub-basins. Facies analyses demonstrated that throughout the four units (Sharilyn, Tsagaantsav, Shinekhudag, and Khukhteeg Formations) exposed at the Dzun Shakhai and Shine Usny Tolgod localities, a broad suite of evolving transitional depocenters were preserved, including alluvial, fluvial and lacustrine deposits, with several shifts between transverse and axial flow in the basinal drainage system observed. The sedimentary sequences also indicate basin infill initiated in a retrogradational setting (starved stage), that subsequently transitioned to an aggradational setting (filling stage) and eventual progradational settings (filling to filled stage). Additionally, with petrographic analysis and the identification of six syn-rift sequences (SR1-6), this study determined that this portion of the Sainshand Sub-basin reflects a gradual subsidence model that initially received sediment infill from at-source (autochthonous) detritus with subsequent detritus being of a near-source (parautochthonous) nature. Lastly, with significant sedimentological evidence provided, this study suggests 1) the designation of a new member, the Ikh Ulaan Nuur Member of the Shinekhudag Formation, and 2) the subdivision of the Khukhteeg Formation into a lower and upper member. Lithostratigraphic and palaeoenvironmental correlations between the adjacent Zuunbayan and Unegt Sub-basins are herein improved with further correlations to several extensional basins in North China also suggested and/or strengthened. AFRIKAANSE OPSOMMING: Geen opsomming beskikbaar. Masters 2025-05-02T07:05:34Z 2025-05-02T07:05:34Z 2024-12 Thesis https://scholar.sun.ac.za/handle/10019.1/131958 Stellenbosch University xv, 154 pages : illustrations, maps application/pdf Stellenbosch : Stellenbosch University |
| spellingShingle | Sequence stratigraphy Geology, Structural -- Mongolia -- Eastern Gobi basin Paleontology Geology, Stratigraphic -- Cenozoic Geology, Stratigraphic -- Mesozoic Sedimentology -- Dzun Shakhai -- Shine Usny Tolgod UCTD Van Niekerk, Jesse Benjamin Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title | Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title_full | Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title_fullStr | Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title_full_unstemmed | Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title_short | Geology of the Dzun Shakhai and Shine Usny Tolgod localities, Eastern Gobi Basin, Mongolia |
| title_sort | geology of the dzun shakhai and shine usny tolgod localities eastern gobi basin mongolia |
| topic | Sequence stratigraphy Geology, Structural -- Mongolia -- Eastern Gobi basin Paleontology Geology, Stratigraphic -- Cenozoic Geology, Stratigraphic -- Mesozoic Sedimentology -- Dzun Shakhai -- Shine Usny Tolgod UCTD |
| url | https://scholar.sun.ac.za/handle/10019.1/131958 |
| work_keys_str_mv | AT vanniekerkjessebenjamin geologyofthedzunshakhaiandshineusnytolgodlocalitieseasterngobibasinmongolia |