Most interpretatations Ive seen is "high Ti content = increased detritical input=increased runoff or lateral erosion by precipitation = more humid conditions". Why is aeolian input automatically discarded as an accumulation agent in these cases?
Dear Mrs. Pirola,
you are right, most of the Ti contained in anatase, brookite, rutile and ilmenite is detrital in origin and the result of transport in an aquatic system. There are, however, also features observed in the grain morphology which are indicative of a short-distance transport by wind. It resulted mainly from devlation of coastal placer deposits . CAMSIZER studies underscore this statement. See also for titanium
DILL, H.G. (2007) Grain morphology of heavy minerals from marine and continental placer deposits, with special reference to Fe -Ti oxides.- Sedimentary Geology, 198: 1-27.
DILL, H.G. and SKODA, R. (2017) Provenance analysis of heavy minerals in beach sands (Falkland Islands/ Islas Malvinas) – A view to mineral deposits and the geodynamics of the South Atlantic Ocean.- Journal of South American Earth Sciences 78: 17-37.
They are available and ready for download from the Researchgate server.
Le deseo a usted mucho éxito
Cordiales saludos
Harald G. Dill
Thank you, Dr. Dill! I will take a look at these papers...I was just curious because in ohter articles I've read, other researchers usually do not analyze differences in Ti content among different grain-size modes in sediments. If weathering of Ti-bearing minerals is the only source for Ti in, lets say, peat deposits, why do they rule out wind transport altogether? Is it because of the weight of these minerals?
Gracias de nuevo por sus buenos deseos y su rápida respuesta :)
Malena:
Yes, wind transport is a possibility. Kindly see these links:
Best
Syed
https://link.springer.com/referenceworkentry/10.1007%2F1-4020-3880-1_246
Dear Malena: In addition to Dr. Dill's very clear comments. There is a reason that has to do with the ability to transport. Due to its relatively low viscosity coefficient and its low drag, force the air can carry much smaller volumes of debris than water.
"The drag equation is essentially a statement that the drag force on any object is proportional to the density of the fluid and proportional to the square of the relative flow speed between the object and the fluid." Therefore, because the water density is approximately 1000 times the air density, the wind has approximately less transport capacity by 3 orders of magnitude
Un cordial saludo Malena. Carlos
- Badges
- Science topic
- Similar topics
- Higher Education
- Universities