Questions related to Quaternary Geology
I am working on the biostratigraphy of Pleistocene sediments from the high latitude region in south-east Indian ocean sediments. Kindly suggest me any book or articles in which the above-mentioned foraminifera are discussed. The articles on the zonation will more be appreciated.
I struggle to identify these sediments, which I suspect to be fluvio-glacials deposits alluvial from melting glaciers in Eemian.
The area where this conglomerate is exposed have a bed from recent Riss and located 500 km from the Alps (eastern France)...
I'm not expert, so I would be grateful for anyhelp.
In the geological map, I cercled in violet the light yellow area (Recent Riss).
Thank you !
In my studies of pre-Illinoian glacial deposits in Indiana it would be very useful to easily differentiate glacial materials with Bruhes normal and Matuyama reversed polarity. It is my understanding that Schlumberger's Susceptibility Measurement Tool (SUMT) is currently used in petroleum exploration (https://petrowiki.org/Downhole_magnetic_surveys). Is anyone aware of it's use in glacial studies?
Are there any article about paleogene unconsolidated lime-mud state? for example DSDP sites? I'm interested in the question till what time can be marine micritic lime-mud stay in unconsolidated condition.
Algae/fungi/bacterial? Are there dominant multi-species?
Dependence on rural/urban areas.... etc.
We have seen many salt strucutre in normal or reverse fault system, but how about the salt related strike-slip fault?
Quite surprised to get so many answers for my question. Thanks again. All recommended papers I will read carefully. Hoping to get more answers!
Recently in reading the The Salt Tectonics Short Course in Universidade Fernando Pessoa. Some basic knowledge can be learned in this course. Pretty Good!
I have ~5mm thick potsherds which are of archaeological importance. I want to date them using OSL. What steps should I follow during sample preparations and after sample preparation should I target feldspar or quartz or polymineral?
Can someone explain me how exactly should I adapt quaternary sections (age+genesis) built according to USSR Quaternary Commission requirements to international scientific publication or just give me a link to comprehensive example?
The section is attached below.
What are the typical criteria to identify glacial or fuvio-glacial deposits in core samples as old as Permian?
I am looking for alternative methods for the preservation of permafrost, especially in ice-rich discontinuous regions. I have reviewed the studies for woods chips, however, I am looking for results of different materials (i.e., geotextiles, vegetation mats, sod, etc.) or new technologies. I appreciate any direction or research that can will be cited.
I am looking for data especially for limestones that occur as drift in quaternary depositions (moraines) in NE Germany. Uranium concentrations would be best.
Ty in advance!
I would like to get age constraints on the deposition of fluvial sediments in a river deposit in the Kenya Rift. Age estimates are Mid to Late Pleistocene. The sources are mostly basaltic, trachytic and phonolitic lava flows. Quarz content is fairly low, so I'm guessing OSL won't be the method of choice. Any ideas?
I'm working on geological model of an alluvial fan in the Red Sea. I found one and half sequence in the upper 90 meters of a fan. I have one sample from each meter in depth.
Is that Quaternary? or it contain a portion of Pliocene?
At the upper most, should I have highstand tracts?
We measured this Raman spectrum on a secondary mineral speleothem of a lava tube (https://www.researchgate.net/publication/265952424_RAMAN_STUDY_OF_SECONDARY_MINERALS_IN_A_RECENT_LAVA_TUBE). The main body was Thenardite and additionaly this spectrum appears occasionaly. Do you know it ?
Thanks for your help.
Conference Paper RAMAN STUDY OF SECONDARY MINERALS IN A RECENT LAVA TUBE
I have found some grains in the Middle Triassic carbonates (Lower Anisian, Aegean, Lower Muschelkalk) and I'm trying to identify them - please see the attached pictures.
Are they calcispheres of algal origin (e.g., Globochaete alpina) ?
Is it possible to identity them in a range of genus, species?
Does anyone have any experience with such objects?
We are looking for a multidisciplinary team to carry out geological, chronological and environmental studies on stratigraphical sequences reaching at least 20 m deep. Our initial evaluations suggest that the deposits may present a continuous chronostratigraphical sequence dating from around 1.5 Myrs. The two volcanic structures are in a closed depression context linked to soil subsidence at the base of their lava emission centers. This situation is due either to the collapse of the craters under the weight of the lava or to the retraction of the lava during its cooling phase. These depression structures functioned as sediment traps which have yielded archaeological surface remains attributable to the Middle Pleistocene and through to the Holocene. They are located in the south of France, in the Baumes volcanic complex (communes of Caux, Nizas, Pézenas, Lezignan-la-Cebe ...). Exceptional sediment traps, the exhaustive study of these infillings would be a major asset for the paleoenvironmental restitution of the sector and more broadly of Western Europe since 1.5 Ma.
Please contact me if you are interested and I will be able to provide you with more information.
Je cherche une équipe pluri-disciplinaire pour l'étude géologique, chronologique et environnementale sur des séquences stratigraphiques de minimum 20 m de profondeur susceptibles de recouvrir une chronologie continue depuis 1,5 Ma. Il s'agit de deux structures volcaniques en dépression fermées dues à l’affaissement de sol à l’aplomb de centres d’émission de lave soit liées à un effondrement des structures du cratère sous le poids de la lave soit à la rétractation de la matière lors du refroidissement de la lave. Ces structures dépressionnaires ont fonctionné comme des pièges sédimentaires et livrent des éléments archéologiques en surface depuis le pléistocène moyen jusqu’à l’holocène. Elles sont localisées dans le sud de la France, dans le complexe volcanique des Baumes (communes de Caux, Nizas, Pézenas, Lézignan-La-Cèbe ...). Pièges sédimentaires exceptionnels, l’étude exhaustive de leur remplissage serait un atout majeur pour la restitution paléo-environnementale de ce secteur et plus largement de l’Europe de l’ouest depuis 1.5 Ma.
Merci de me contacter pour de plus amples renseignements.
I am wondering if mangrove environments have ever been considered in global carbonate budget calculations? How are these systems affected by climate/drainage change?
The north Apennine (Italy) is characterized by the presence of numerous releasing/restraining bend related to sinistral "snake" strike-slip shear zones.
The archaeological record is useful to look at in terms of palaeo hazards but has not been utilized that much yet.
Is there empirical or modeling data showing how coastal aquifers respond to sea level changes (tens to hundred meters) during the Pleistocene?
For my current research I am trying to find a map which includes the location of the Storegga Submarine Slide and both the Stuoragurra fault and the Parve fault. Does anyone whether a map like that exists?
Does anyone know of any research into increased melt supply rates in volcanoes (preferably coastal or island arcs) as a result of sea level rise? Preferably with regard to the Early Holocene Sea Level Rise. I am trying to find further research to support the notion that mantle loading as a result of sea level rise and pressure increase can promote the ascension of fresh magma.
Symbols or a legend used in geomorphological mapping varies significantly from map to map and place to place and they are not consistent. The legend and mapping symbols in geomorphological maps are likely to be chosen on the basis of purpose of the output, and hence the legend is not pretty standard with compared to that in other maps like geological. I am planning to compile a geomorphological map in an area where is largely covered with alluvial fills and fluvial erosional landforms. Is there any standard protocol or guideline or any good article on geomorphological mapping that could be useful for reading?
I'm a little confused about the inter-changeability of these terms in a marine sedimentation context. My understanding is as follows:
Glaciogenic sedimentation = sedimentation derived from glaciers (or ice-sheets)
Glacimarine sedimentation = sedimentation derived from glaciers (or ice-sheets) that calve directly into the marine environment.
If this is correct then glacimarine sedimentation is a subset of glaciogenic and either of the terms could be used when referring to an ice-sheet that extends into the sea.
Can anybody provide some clarification?
I would like to know the Zr/Ti ratio present in mud flat sediments. Is there any world average or a range? I'm reading (from "Dellwig, O., Hinrichs, J., Hild, A., Brumsack, H.-J. (2000). Changing sedimentation in tidal flat sediments of the southern North Sea from the Holocene to the present: a geochemical approach. Journal of Sea Research, 44: 195-208") that this ratio is different for present and Holocene sediments of mud flats. The Zr/Ti ratio reported in this paper for recent sediments is 0.25 and for heavy minerals it is 0.48. We obtain a value of around 50 for recent sediments of east coast of India. I would like to clarify that. Any information on sea level fluctuations along east coast of India is also welcome.
I'm looking for the paper of Matsumoto (1924) in which the genus was established, the paper in which Palaeoloxodon raised up to rank of genus e and so on. Can you help me?
I tried to understand the meaning of D(4,3) and D(0,5) values in grain size analysis, but everywhere it is written that these values are volume weighted mean and surface weighted mean. I do not understand what does it mean and what it reflects.
We have sediment cores from a lake and in the anoxic part (where we have varves), we have alternate carbonate and organic layers. In the same varve layers we do not have any tree pollen. Can anyone please suggest what could be the possible reason behind that?