scholarly journals River response to climate and sea level changes during the Late Saalian/Early Eemian in northern Poland – a case study of meandering river deposits in the Chłapowo cliff section

Geologos ◽  
2016 ◽  
Vol 22 (1) ◽  
pp. 1-14
Author(s):  
Damian Moskalewicz ◽  
Robert J. Sokołowski ◽  
Stanisław Fedorowicz
Keyword(s):  
Sea Level ◽  
River Sediments ◽  
Luminescence Dating ◽  
Heavy Minerals ◽  
Sea Level Changes ◽  
Point Bar ◽  
Meandering River ◽  
Base Level ◽  
River Deposits ◽  
And Sea Level

Abstract Fluvial sediments in the Chłapowo cliff section were studied in order to reconstruct their palaeoflow conditions and stratigraphical position. Lithofacies, textural and palaeohydraulic analyses as well as luminescence dating were performed so as to achieve the aim of study. Sedimentary successions were identified as a record of point bar cycles. The fluvial environment probably functioned during the latest Saalian, shortly after the retreat of the Scandinavian Ice Sheet. Discharge outflow was directed to the northwest. The river used the older fluvioglacial valley and probably was directly connected to the Eem Sea. Good preservation and strong aggradation of point-bar cycles were related to a rapid relative base level rise. The meandering river sediments recognised showed responses to climate and sea level changes as illustrated by stratigraphical, morphological and sedimentological features of the strata described. The present study also revealed several insights into proper interpretation of meandering fluvial successions, in which the most important were: specific lithofacies assemblage of GSt (St, Sp) → Sl → SFrc → Fm (SFr) and related architectural elements: channel/sandy bedforms CH/SB → lateral accretion deposits LA → floodplain fines with crevasse splays FF (CS); upward-fining grain size and decreasing content of denser heavy minerals; estimated low-energy flow regime with a mean depth of 1.6–3.3 m, a Froude number of 0.2–0.4 and a sinuosity of 1.5.

scholarly journals Modeling of dense well block point bar architecture based on geological vector information: A case study of the third member of Quantou Formation in Songliao Basin

2021 ◽  
Vol 13 (1) ◽  
pp. 39-48
Author(s):  
Chao Luo ◽  
Ailin Jia ◽  
Jianlin Guo ◽  
Wei Liu ◽  
Nanxin Yin ◽  
...  
Keyword(s):  
River Sediments ◽  
Three Dimensional ◽  
Songliao Basin ◽  
Point Bar ◽  
Meandering River ◽  
Architecture Model ◽  
The Third ◽  
Continuous Convergence ◽  
Vector Information ◽  
Architecture Modeling

Abstract Although stochastic modeling methods can achieve multiple implementations of sedimentary microfacies model in dense well blocks, it is difficult to realize continuous convergence of well spacing. Taking the small high-sinuosity meandering river sediments of the third member of Quantou Formation in Songliao Basin as an example, a deterministic modeling method based on geological vector information was explored in this article. Quantitative geological characteristics of point bar sediments were analyzed by field outcrops, modern sediments, and dense well block anatomy. The lateral extension distance, length, and spacing parameters of the point bar were used to quantitatively characterize the thickness, dip angle, and frequency of the lateral layer. In addition, the three-dimensional architecture modeling of the point bar was carried out in the study. The established three-dimensional architecture model of well X24-1 had continuous convergence near all wells, which conformed to the geological knowledge of small high-sinuosity meandering river, and verified the reliability of this method in the process of geological modeling in dense well blocks.

Impacts of palaeogeography and sea level changes on Mid-Cretaceous climate

2007 ◽  
Vol 247 (3-4) ◽  
pp. 357-381 ◽  
Author(s):  
F. Fluteau ◽  
Gilles Ramstein ◽  
Jean Besse ◽  
R. Guiraud ◽  
J.P Masse
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
And Sea Level

Reef episodes, anoxia and sea-level changes in the Frasnian of the southern Timan (NE Russian platform)

2000 ◽  
Vol 178 (1) ◽  
pp. 147-176 ◽  
Author(s):  
M. R. House ◽  
V. V. Menner ◽  
R. T. Becker ◽  
G. Klapper ◽  
N. S. Ovnatanova ◽  
...  
Keyword(s):  
Sea Level ◽  
Russian Platform ◽  
Sea Level Changes ◽  
And Sea Level

scholarly journals Influence of orbital forcing and sea level changes on sedimentation patterns in the Timor Sea during the last 260 ka

2008 ◽  
Vol 23 (1) ◽  
pp. n/a-n/a ◽  
Author(s):  
Eva Moreno ◽  
Franck Bassinot ◽  
François Baudin ◽  
Marie-Thérèse Vénec-Peyré
Keyword(s):  
Sea Level ◽  
Orbital Forcing ◽  
Sea Level Changes ◽  
Timor Sea ◽  
And Sea Level

Reef coralgal assemblages as recorders of paleobathymetry and sea level changes in the Indo-Pacific province

1999 ◽  
Vol 18 (14) ◽  
pp. 1681-1695 ◽  
Author(s):  
G. Cabioch ◽  
L.F. Montaggioni ◽  
G. Faure ◽  
A. Ribaud-Laurenti
Keyword(s):  
Sea Level ◽  
Sea Level Changes ◽  
And Sea Level

Insights in beachrock formation mechanism using multiproxy experimental data: Case study of Diolkos, Corinth, Greece

2021 ◽  
Author(s):  
Giannis Saitis ◽  
‪Konstantinos Tsanakas ◽  
Anna Karkani ◽  
Satoru Kawasaki ◽  
Niki Evelpidou
Keyword(s):  
Sea Level ◽  
Formation Mechanism ◽  
Analytical Data ◽  
Mean Value ◽  
Luminescence Dating ◽  
Sea Level Changes ◽  
Needle Penetration ◽  
Beach Sediments ◽  
Needle Penetration Test ◽  
Ureolytic Bacteria

<p>Many studies have been published concerning the occurrence and formation mechanism of beachrocks around the world. However, there are only few quantified data on the precipitation mechanism and the parameters affecting it. The formation mechanism of beachrocks is directly related to their palaeoenvironmental significance, as it provides insights into sea level evolution and palaeogeographic evolution. In this study we corelate analytical data of natural and artificial beachrocks, which were created by the microbially induced carbonate precipitation (MICP) technique using sediments and ureolytic bacteria from the coastal zone of Diolkos, Corinth, Greece.</p><p>A multiproxy analysis was accomplished which included the mineralogical and geochemical analysis of both natural and artificial beachrocks, and the sedimentological and mechanical properties analysis of the artificial ones. This study focuses on four parameters that concern the cementation processes of artificial beachrocks: (a) sediment granulometry, (b) CaCO<sub>3 </sub>content, (c) bacteria type and (d) cement type. Diolkos, due to its location and history, presents great palaeo-geographic and geoarchaeological interest; for this reason, luminescence dating was accomplished on selected beachrock samples, in order to elucidate the relative sea level changes (RSL) and palaeogeographic evolution of the site.</p><p>For the artificial beachrocks formation, we conducted solidification test using ureolytic bacteria <em>Micrococcus yunnanensis sp.</em> and <em>Virgibacillus sp. </em>isolated from local sand samples. In order to determine the solidification of the beach sediments we estimated the unconfined compressive strength (UCS) by using needle penetration test on the surface of each sample. Furthermore, the precipitated CaCO<sub>3</sub> cement of the artificial beachrock samples, was calculated using HCl rinsing method. The artificial beachrocks were examined under SEM-EDS, XRD and XRF for their mineralogical and chemical composition accordingly.</p><p>Microscopy studies (optical and SEM-EDS) revealed that the cement of the artificial beachrock consists of calcite, in form of acicular sediment coating forming fans and multilayer concentrations. The cement in many cases was amorphous calcite crystals or microcrystalline, with thickness varying between 5 μm and 40 μm. The analysis from the artificial beachrock was correlated with the natural beachrock of Diolkos area. Our results revealed that the artificial beachrocks had different type of cement with microstratigraphy of an early digenesis. Moreover, amongst the artificial beachrocks, the sample with very well sorting (in terms of granulometry) has shown high values of CaCO<sub>3</sub> content, which corresponds to cement, a mean value of UCS 11 MPa and the best cement precipitation.</p>

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