Physical, Chemical, and Mineralogical Characteristics of Modern Eolian Dust in Japan and Rate of Dust Deposition

1987 ◽  
Vol 33 (3) ◽  
pp. 327-345 ◽  
Author(s):  
Katsuhiro Inoue ◽  
Toshiro Naruse
Keyword(s):  
Dust Deposition ◽  
Eolian Dust ◽  
Physical Chemical ◽  
Mineralogical Characteristics

Palaeogeographic controls on palygorskite occurrence in Maastrichtian-Palaeogene sediments of the Western High Atlas and Meseta Basins (Morocco)

Clay Minerals ◽  
2014 ◽  
Vol 49 (4) ◽  
pp. 595-608 ◽  
Author(s):  
A. Knidiri ◽  
L. Daoudi ◽  
M. El Ouahabi ◽  
B. Rhouta ◽  
F. Rocha ◽  
...  
Keyword(s):  
Depositional Environment ◽  
Chemical Precipitation ◽  
X Ray Diffraction ◽  
High Atlas ◽  
X Ray ◽  
Smectite Clays ◽  
Physical Chemical ◽  
Mineralogical Characteristics ◽  
The Difference ◽  
Chemical Conditions

AbstractThe Maastrichtian-Palaeogene series of the Western High Atlas and Meseta Basins in Morocco are particularly rich in palygorskite. The present work is aimed at clarifying the genesis of palygorskite from the interbedded facies and gaining an understanding of their relationships with the depositional environment. The mineralogical characteristics of palygorskite from these series were studied by X-ray diffraction (XRD) and electron microscopy (SEM/TEM). The palygorskite content and microstructure show large geographical and stratigraphical variations in the deposits studied. The palygorskite occurrence is directly related to palaeobathymetry, since it is the dominant clay mineral in shallow marine and restricted environments. According to the morphology of palygorskite crystallites, four types of textures were distinguished. These types of palygorskite are polygenetic, formed by chemical precipitation, by the recrystallization of smectite clays or reworked by wind or water from sub-aerial environments. The difference between the two studied sub-basins with respect to palygorskite occurrence is attributed to the palaeomorphology of the hinterlands, to the tectonic differentiation and to the physical-chemical conditions of seawater.

scholarly journals Modern eolian dust deposition in central Asia

Tellus B ◽  
1994 ◽  
Vol 46 (3) ◽  
pp. 220-233 ◽  
Author(s):  
C. P. WAKE ◽  
P. A. MAYEWSKI ◽  
Z. LI ◽  
J. HAN ◽  
D. QIN
Keyword(s):  
Central Asia ◽  
Dust Deposition ◽  
Eolian Dust

scholarly journals Eolian Dust Deposition in the Last Glacial Stage (43-12 ka) in Tanigumi Moor, Gifu Prefecture, Central Japan.

2001 ◽  
Vol 40 (3) ◽  
pp. 211-218
Author(s):  
M. E. K. Chowdhury ◽  
Toshiro Naruse ◽  
Shusaku Yoshikawa ◽  
Shin Toyoda
Keyword(s):  
Dust Deposition ◽  
Central Japan ◽  
Last Glacial ◽  
Eolian Dust ◽  
Glacial Stage ◽  
Gifu Prefecture ◽  
The Last Glacial

The Effect of the Calcination Temperature on the Physical, Chemical and Mineralogical Characteristics of Sugar Cane Bagasse Ash (SCBA) for Use As Pozzolan

2021 ◽  
Vol 47 (3) ◽  
pp. 546-556
Author(s):  
Tiago Assunção Santos ◽  
Raquel Arraes Argolo ◽  
Daniel Véras Ribeiro
Keyword(s):  
Calcination Temperature ◽  
Sugar Cane ◽  
Sugar Cane Bagasse ◽  
Pozzolanic Activity ◽  
Infrared Spectrometry ◽  
X Ray ◽  
Physical Chemical ◽  
Mineralogical Characteristics ◽  
Washing Process ◽  
Sugar Cane Bagasse Ash

Statement of Novelty: This study analyzes the influence of the washing process and the calcination temperature on the morphological, physical, chemical and mineralogical characteristics of SCBA. The objective of the present study is to evaluate the morphological, physical, chemical and mineralogical characteristics of sugar cane bagasse ash (SCBA). The ashes were obtained by calcination of sugarcane bagasse (SCB), a waste product generated by the sugar and alcohol industry, at temperatures of 500°C, 600° C and 700°C, and the influence of this calcination on the pozzolanic activity of SCBA. The techniques used to characterize these ashes include helium gas picnometry, sedigraphy, scanning electron microscopy (SEM), X-ray fluorescence (XRF), X-ray diffractometry (XRD) and Fourier transform infrared spectrometry (FTIR). The evaluation of the pozzolanicity of these ashes was carried according to chemical titration method as proposed by Fratini, modified Chapelle method and finally using the pozzolanic activity index (PAI) with cement. The results showed that the SCBA presented high pozzolanicity, regardless of the calcination temperature.

scholarly journals Modern eolian dust deposition in central Asia

Tellus B ◽  
1994 ◽  
Vol 46 (3) ◽  
pp. 220-233 ◽  
Author(s):  
C. P. Wake ◽  
P. A. Mayewski ◽  
Z. Li ◽  
J. Han ◽  
D. Qin
Keyword(s):  
Central Asia ◽  
Dust Deposition ◽  
Eolian Dust
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