Uranium distribution and mobility in the weathering zone of the Nisa deposit, Portugal

2018 ◽  
Vol 44 (3) ◽  
pp. 497-512
Author(s):  
C. M. Prazeres ◽  
M. J. Batista ◽  
A. J. Pinto ◽  
M. A. Gonçalves
Keyword(s):  
Uranium Distribution ◽  
Weathering Zone

IMAGING URANIUM DISTRIBUTION ON RAT KIDNEY SECTIONS THROUGH DETECTION OF ALPHA TRACKS USING CR-39 PLASTIC NUCLEAR TRACK DETECTOR

2018 ◽  
Vol 183 (1-2) ◽  
pp. 242-246 ◽  
Author(s):  
T Konishi ◽  
S Kodaira ◽  
Y Itakura ◽  
D Ohsawa ◽  
S Homma-Takeda
Keyword(s):  
Rat Kidney ◽  
Track Detector ◽  
Nuclear Track Detector ◽  
Uranium Distribution

scholarly journals Intracellular uranium distribution: Comparison of cryogenic fixation versus chemical fixation methods for SIMS analysis

2018 ◽  
Vol 81 (8) ◽  
pp. 855-864 ◽  
Author(s):  
D. Suhard ◽  
C. Tessier ◽  
L. Manens ◽  
F. Rebière ◽  
K. Tack ◽  
...  
Keyword(s):  
Chemical Fixation ◽  
Fixation Methods ◽  
Uranium Distribution ◽  
Sims Analysis

Composite Geoelectrical Investigation to Delineate Groundwater Feasibility in Hard Rock area of Raipur, Chhattisgarh, India.

2022 ◽  
Vol 9 (1) ◽  
pp. 0-0
Keyword(s):  
Hard Rock ◽  
Geophysical Investigation ◽  
Groundwater Movement ◽  
Indian State ◽  
Subsurface Fractures ◽  
Resistivity Meter ◽  
Integrated Geophysical Survey ◽  
And Storage ◽  
Weathering Zone ◽  
Resistivity Profiling

In hard rock terrains, groundwater movement, migration, and storage occur through subsurface fractures. To assess the fractures and associated water, we carried integrated geophysical investigation with Wenner, (GRP), Schlumberger, and Pole-Dipole array in Indian State. The resistivity survey carried out using a CRM-500 resistivity meter. The analyzed results are also re-verified with the help of IPI2WIN software. Initially, lateral and surface variations of resistivity were plotted by using Wenner and Gradient Resistivity profiling array. Then the low resistivity points were investigated with Schlumberger and Pole-Dipole array. In interpretation, low resistive zones identified correspond to the possible fractured zones. The results allowed mapping of the weathering zone at depth 12 to 15 m, and deep fracture lies below depth 55.0 m depth. The present study validates that the integrated Geophysical survey is a powerful exploration technique to scrutinize and identify water-bearing fractures in the hard rock area.

Physical Characteristics of Boulders Formed in the Tropically Weathered Granite

2015 ◽  
Vol 72 (3) ◽  
Author(s):  
Mohd Firdaus Md Dan ◽  
Edy Tonnizam Muhamad ◽  
Ibrahim Komoo ◽  
Mohd Nur Asmawisham Alel
Keyword(s):  
Ground Surface ◽  
Spherical Shape ◽  
Soil Surface ◽  
Physical Characteristics ◽  
Common Phenomenon ◽  
Weathering Profile ◽  
Hilly Area ◽  
Thick Stratum ◽  
Weathering Zone ◽  
Colour Chart

Deep weathering profile is a common phenomenon for humid tropic especially in Malaysia. The reactions of deep weathering under soil surface are decomposition of the massive rock and formation of thick stratum of soil and boulders. However, the occurrence of embedded boulders or loose blocks in the highly to completely weathered in the hilly area is not fully understood and investigated. This paper investigates the occurrence and physical characteristics of boulders in the granitic area. The parameters investigated are boulder’s discoloration, size, shape, rindlet properties and their distribution. Colour and shape were determined based on rock colour chart by Krumbein and Croft’s chart respectively. Size, rindlet and its distribution were determined based on field observation. Field results revealed that boulders in the hilly area can be found as shallow as 2 m from ground surface. In addition, it is found that boulder that embedded in deeper zone became larger in size and surrounded by thicker rindlet of up to 50 cm thick. Boulders embedded in soil stratum at weathering zone 4 and 5 are mostly independent and scattered around the weathering profile. The boulders can also be presented in various shapes; the smaller boulder is located at the upper zone more to flat to very spherical shape and rounded to well rounded edges, while the larger boulder that is located at lower zone more to sub-spherical shape and well rounded edges.

Davis Creek silt, an Early Pleistocene or Late Pliocene deposit in the Cypress Hills of Saskatchewan

1989 ◽  
Vol 26 (1) ◽  
pp. 192-198 ◽  
Author(s):  
W. J. Vreeken ◽  
R. W. Klassen ◽  
R. W. Barendregt
Keyword(s):  
Volcanic Ash ◽  
Magnetic Polarity ◽  
Polarity Reversal ◽  
Early Pleistocene ◽  
The South ◽  
Glacial Deposits ◽  
Late Pliocene ◽  
Late Wisconsinan ◽  
Weathering Zone ◽  
Magnetic Polarity Reversal

Davis Creek silt is the informal name for a previously unreported loess and its reworked detritus encountered at several locations to the south of the east and centre blocks of the Cypress Hills. This unit intervenes between a pediment with an estimated age of 10 Ma and Late Wisconsinan glacial deposits. Because the unit has reversed magnetization, it is older than 788 ka, the astronomical age of the Matuyama–Brunhes magnetic polarity reversal. The unit also contains an undated volcanic ash from the Pearlette ash family that could represent the Mesa Falls (1.27 Ma) or the Huckleberry Ridge (2.02 Ma) ash bed. Davis Creek silt overlies an oxidized weathering zone and contains large secondary carbonate nodules near its truncated top that were, in places, reworked into a lag deposit or stone line before accumulation of the glacial overburden. At one location Davis Creek silt is separated from this overburden by a unit of cryoturbated gravelly loam with remnants of a reddish-yellow paleosolic B horizon.

Controls on uranium distribution in lake sediments

2010 ◽  
Vol 74 (1) ◽  
pp. 203-214 ◽  
Author(s):  
Anthony Chappaz ◽  
Charles Gobeil ◽  
André Tessier
Keyword(s):  
Lake Sediments ◽  
Uranium Distribution
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