+ Resolve Article
+ Follow Us
Follow on FacebookFollow on Facebook
Follow on TwitterFollow on Twitter

+ Translate
+ Subscribe to Site Feed
GeoScience Most Shared ContentMost Shared Content

Affect of sedimentation on stromatolite reef growth and morphology, Ediacaran Omkyk Member Nama Group, Namibia

, : Affect of sedimentation on stromatolite reef growth and morphology, Ediacaran Omkyk Member Nama Group, Namibia. South African Journal of Geology 109(1-2): 87-96

Superbly preserved reefs of Ediacaran age in Namibia give clues to environmental controls on stromatolite-thrombolite growth morphology and nucleation. Digital mapping and Measured stratigraphic sections reveal parasequences featuring meter-scale alternation of shallow marine shale and stromatolitic-thrombolitic microbialites associated with other clastic carbonates (grainstones, mudstones). Stromatolite-thrombolite column width, spacing and height vary systematically with the type of sediment being deposited, with growth inhibited during shale deposition. Columns are generally wider and more closely spaced during carbonate sediment deposition and narrower and more widely spaced during shale deposition. While stromatolite growth should be sensitive to sediment type explicitly, we also interpret sediment type as a general proxy for changing environmental conditions (e.g. water depth, turbidity) that may directly affect reef growth. A simple rule-based numerical simulation of microbialite growth is formulated based on the field interpretations of sedimentological and topographic growth controls. The model cannot explain detailed morphologic attributes, but can recreate correlations between stromatolite column widths, column spacing and layer bed thickness as a function of sediment type.


DOI: 10.2113/gssajg.109.1-2.87

Other references

Bedoya L.A.; Papendick R.; Alpert H.; Vaamonde C.A., 1986: Role of glomerular hyperfiltration in the protection of diabetic rats against gentamicin nephrotoxicity. Clinical Research 34(2): 589A

Roszkowski, J., 1967: Oxidoreduc -tion properties of actinomycins. The experiments were performed with crystalline actinomycins C and K obtained from the Institute of Antibiotics, Warsaw. The oxidoreduction reaction was assayed by spectrophotometric, chromatographic, and biological methods (antibacterial activity...

Debalke, S.; Cheneke, W.; Tassew, H.; Awol, M., 2014: Urinary Tract Infection among Antiretroviral Therapy Users and Nonusers in Jimma University Specialized Hospital, Jimma, Ethiopia. Background. The introduction of antiretroviral therapy (ART) has dramatically reduced morbidity related with bacterial infection including urinary tract infection (UTI) among patients with HIV/AIDS. This study was carried out to determine the prev...

Ali, S.Saad.Azhar.; Moinuddin, M.; Raza, K.; Adil, S.Hasan., 2015: An adaptive learning rate for RBFNN using time-domain feedback analysis. Radial basis function neural networks are used in a variety of applications such as pattern recognition, nonlinear identification, control and time series prediction. In this paper, the learning algorithm of radial basis function neural networks i...

Giles David L.; Schilling John H., 1972: Variations in the rhenium content of molybdenite. International Geological Congress, Abstracts--Congres Geologique Internationale, Resumes 24: 307

Laster, Z.; Weisberg, A.; Gershonovitch, S.; Baruch, D., 2003: A new tricortical implant. We wish to introduce a new type of implant intended for use in the posterior maxilla when only 8 mm or less of the resorbed alveolar ridge is present, without the need for sinus lift procedures or ridge augmentation. The implant is called "Ex...

Pyun K.H.; Ochs H.D.; Zhu Q.; Fischer S.H.; Kikutani H.; Kishimoto T.; Wedgwood R.J., 1988: Fc omega receptor in primary immunodeficiency disorders. Clinical Research 36(1): 211A

Lindquist, B.A.; Dutta, S.; Jadrich, R.B.; Milliron, D.J.; Truskett, T.M., 2017: Interactions and design rules for assembly of porous colloidal mesophases. Porous mesophases, where well-defined particle-depleted 'void' spaces are present within a particle-rich background fluid, can be self-assembled from colloidal particles interacting via isotropic pair interactions with competing attracti...

Oka K.; Kantrowitz J.D.; Spector S., 1985: Isolation of morphine from toad bufo marinus skin. A nonpeptide opioid was found in toad skin and purified to homogeneity by using HPLC[high performance liquid chromatography] with electrochemical detection. A nonpeptide opioid also was detected in bovine brain and adrenals as well as rabbit and r...

Bzdega, T.; Chin, H.; Kim, H., 1993: Regional expression and chromosomal localization of the d opiate receptor gene. The characterization and expression of a d opiate receptor gene are reported. Opiate research is prompted by both a desire to understand the workings of the mind and an expectation that opioid analgesics, such as morphine, can be improved upon by...