Passive versus active salt diapirism

AAPG Bulletin ◽  
2021 ◽  
Vol 105 (1) ◽  
pp. 53-63
Author(s):  
Mark G. Rowan ◽  
Katherine A. Giles
Keyword(s):  
Salt Diapirism ◽  
Active Salt

Mechanics of active salt diapirism

1993 ◽  
Vol 228 (3-4) ◽  
pp. 275-312 ◽  
Author(s):  
D.D. Schultz-Ela ◽  
M.P.A. Jackson ◽  
B.C. Vendeville
Keyword(s):  
Salt Diapirism ◽  
Active Salt

Development of banded terrain in an active salt diapir: potential analog to Mars

Geomorphology ◽  
2021 ◽  
pp. 107824
Author(s):  
Amos Frumkin ◽  
Shachak Pe’eri ◽  
Israel Zak
Keyword(s):  
Salt Diapir ◽  
Active Salt

scholarly journals Local radon flux maxima in the quaternary sediments of Schleswig–Holstein (Germany)

2021 ◽  
Author(s):  
Johannes Albert ◽  
Maximilian Schärf ◽  
Frieder Enzmann ◽  
Martin Waltl ◽  
Frank Sirocko
Keyword(s):  
Water Content ◽  
Pore Space ◽  
Mineralogical Composition ◽  
Fault System ◽  
Near Surface ◽  
Salt Diapirism ◽  
The North ◽  
Radon Flux ◽  
Published Evidence ◽  
Tectonically Active

AbstractThis paper presents radon flux profiles from four regions in Schleswig–Holstein (Northern Germany). Three of these regions are located over deep-rooted tectonic faults or salt diapirs and one is in an area without any tectonic or halokinetic activity, but with steep topography. Contrary to recently published studies on spatial patterns of soil radon gas concentration we measured flux of radon from soil into the atmosphere. All radon devices of each profile were deployed simultaneously to avoid inconsistencies due to strong diurnal variations of radon exhalation. To compare data from different seasons, values had to be normalized. Observed radon flux patterns are apparently related to the mineralogical composition of the Quaternary strata (particularly to the abundance of reddish granite and porphyry), and its grain size (with a flux maximum in well-sorted sand/silt). Minimum radon flux occurs above non-permeable, clay-rich soil layers. Small amounts of water content in the pore space increase radon flux, whereas excessive water content lessens it. Peak flux values, however, are observed over a deep-rooted fault system on the eastern side of Lake Plön, i.e., at the boundary of the Eastholstein Platform and the Eastholstein Trough. Furthermore, high radon flux values are observed in two regions associated with salt diapirism and near-surface halokinetic faults. These regions show frequent local radon flux maxima, which indicate that the uppermost strata above salt diapirs are very inhomogeneous. Deep-rooted increased permeability (effective radon flux depth) or just the boundaries between permeable and impermeable strata appear to concentrate radon flux. In summary, our radon flux profiles are in accordance with the published evidence of low radon concentrations in the “normal” soils of Schleswig–Holstein. However, very high values of radon flux are likely to occur at distinct locations near salt diapirism at depth, boundaries between permeable and impermeable strata, and finally at the tectonically active flanks of the North German Basin.

Relative sodium-to-chloride permeability in the proximal convoluted tubule

1978 ◽  
Vol 235 (6) ◽  
pp. F592-F604 ◽  
Author(s):  
C. A. Berry ◽  
F. C. Rector
Keyword(s):  
Ion Selectivity ◽  
Paracellular Pathway ◽  
Salt Transport ◽  
Chloride Permeability ◽  
Nacl Concentration ◽  
Active Salt ◽  
Junctional Complexes ◽  
Series Of Experiments ◽  
Dilution Potential

Electrophysiological techniques were used in isolated perfused proximal convoluted tubules (PCT) to examine the effect of changes in bath protein concentration on paracellular properties and of active salt transport on relative sodium-to-chloride permeability (PNa/PCl). Control transepithelial potential difference (PD) and NaCl dilution potentials were determined in tubules perfused and bathed with an ultrafiltrate-like solution. PNa/PCl was calculated from the NaCl dilution potential. In the first series of experiments PD and PNa/PCl were redetermined in the same PCT following three experimental maneuvers known to inhibit active salt transport. Addition of 10(-5) M ouabain to the bath, removal of luminal glucose and alanine, and removal of luminal glucose, alanine, bicarbonate, and acetate reduced PD but did not alter the NaCl dilution potential, and therefore PNa/PCl was constant. Constant PNa/PCl in these experiments suggests a) that lowering bath NaCl concentration does not change transcellular current flow, b) that PNa/PCl reflects the ion selectivity of the paracellular pathway, and c) that the ion selectivity of the paracellular pathway is independent of active salt transport. In the second set of experiments PD and PNA/PCl were redetermined following addition of protein to the bath. Neither PD nor PNa/PCl was altered. Analyses of these data argue against modulation of paracellular permeability by bath protein in the in vitro rabbit PCT and suggest that the ion selectivity of the paracellular pathway is determined predominantly by junctional complexes rather than lateral intercellular spaces.

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