I am working on Fe nodules present in late Pleistocene- early holocene alluvium which is overlain by laterite. I want to know if i generate major and trace element data of laterite soil. How it can be useful in geological studies? If it can be used in studies of Fe nodules and alluvium or the major and trace element data of laterite has some other geological significance.
Here goes some relevant work..
Trace metals in natural iron oxides from laterites: A study using selective kinetic extraction ,Geochimica et Cosmochimica Acta, Volume 59, Issue 7, April 1995, Pages 1285-1297(https://doi.org/10.1016/0016-7037(95)00043-Y)
Abstract; To determine the extent of metal association in natural iron oxides, a combination of XRD and chemical selective dissolution techniques was applied to four samples from laterites developed on peridotites in East Africa. The reagents used were dithionite-citrate-bicarbonate (DCB), citrate-bicarbonate (CB), hydroxylamine hydrochloride (HH), and oxalic acid-oxalate (Tamm). From the results obtained, it appears that: (1) the difference DCB minus CB is a better estimator of the metal fraction in Fe oxides than the difference DCB minus oxalic acid-oxalate, especially in presence of gibbsite; (2) the use of HH allows to be distinguished the specific contribution of Mn oxide; and (3) geochemical models for goethite must provide for the existence of ternary solid solutions (Fe, Al, Cr).With regard to the geochemical properties of the elements, it can be concluded that: (1) Cr substitutes for Fe in the same proportions in goethite, hematite, and maghemite; (2) in contrast, A1 substitutes largely for Fe in goethite, little in hematite, and not at all in maghemite; (3) Mn substitutes partly for Fe, but forms discrete phases when total Mn content is high; (4) Ti substitutes for Fe in hematite, but not in goethite; (5) the major Cu-bearing phase is a spinel; and (6) Ni is closely associated with goethite and not with Mn oxides and spinel.
Chemical mobilizations in laterites: Evidence from trace elements and
238U-234U-230Th disequilibria ,Geochimica et Cosmochimica Acta, Vol. 66, No. 7, pp. 1197–1210, 2002
Abstract—Geochemical and mineralogical investigations, including measurements of major and trace elements, Sr isotope ratios, and 238U-234U-230Th activity ratios, were made on an old African laterite to reconstruct its formation steps and assess recent chemical mobilization. The present data support a scenario of discontinuous formation for the laterite, with different bedrock weathering conditions during the formation of each unit, rather than a scenario of continuous formation. Absolute accumulation of Fe, U, and lanthanides in the uppermost ferruginous unit suggests an autochthonous origin of this iron cap by leaching of an older overlying profile. Present chemical distributions of lanthanides, as well as of Rb, K, Ba, and Sr, within the profile cannot be linked to the mineralogical distribution of both relictual primary and authigenic secondary phases. Complementary lanthanide patterns indicate that these elements were primarily accumulated in the uppermost ferruginous unit before further remobilization and accumulation in the underlying horizons. These redistribution processes may be related to the chemical instability of the ferruginous cap. The 238U-234U-230Th disequilibria indicate that recent U mobilization occurs in the whole profile and that, as for lanthanides, there is a vertical redistribution of U from the uppermost ferruginous unit to the underlying horizons. Moreover, these data show that both U losses and gains exist at each level of the profile. A simple modeling of this double U mobilization process is proposed to interpret the 238U-234U-230Th data. Differences in the mobilization and fractionation intensities of the U input and removal processes can account for the two evolution trends, whichdistinguish the ferruginous unit from the underlying ones. Furthermore, on the basis of this modeling, the profile appears to be in a transient state because of recent changes in the U mobilization conditions, whichcould correspond to major Pleistocene climatic variations. PDF enclosed for further reading...
Dear Mr. Jha,
it is hard to filter out what the essence of your question is and what it is aimed at. There are two different stories ferricretes in alluvial sediments and laterite above. You should present some more data to help somebody find a reasonable answer to solve your issue.
H.G.Dill
Respected Sir (Dr. Anoop Kumar Srivastava),
The two research papers referred by you and the research papers mentioned inside it are definately useful to me. Thanks for your answer.
With Best Regards,
Prakash Jha
PhD student/ research scholar
Respected Sirs, (Prof. H. G. Dill and Prof. K. M. Towe)
I am working on Fe nodules/concretions in W. Bengal, India. When i visited the field areas for studying Fe nodules. At most of the area, i found vast terrain of Laterite since the Fe nodules are found in underlain alluvium. So, i collected good number of samples of laterite from many areas in W. bengal along with the Fe nodules and alluvium samples from the underlain alluvium profile from quarries. I am doing geochemical studies of alluvium and Fe nodules present in it. Since i got samples of latertie also which is overlying the alluvium. So, i thought about generating major and trace element data of laterite also. Thats why i asked the fellow Researchers about laterite geochemical data and if it has any relation with the studies of underlying alluvium and Fe nodules present within the alluvium. or it has some other geological significance.
With best Regards,
Prakash Jha
PhD student/research scholar
- Badges
- Science topic