Metallogenie hydrothermale dans les monts de Teboursouk (Tunisie septentrionale)

1951 ◽  
Vol S6-I (7) ◽  
pp. 381-388
Author(s):  
Jean Bolze ◽  
Hans Schneiderhoehn
Keyword(s):  
Low Temperature ◽  
Fault Zone ◽  
Active Fault ◽  
The Other ◽  
Northern Tunisia ◽  
Common Cause ◽  
Basement Rocks ◽  
Lead And Zinc ◽  
Ore Deposition ◽  
Very Low Temperature

Abstract The hydrothermal sphalerite- galena-pyrite deposits on the flanks of the Triassic Fedj el Adoun diapir in the Teboursouk mountains of northern Tunisia, post-Pliocene in age, are controlled structurally by two principal fault directions, one parallel to the diapir contact and the other perpendicular to it. Microscopic evidence indicates very low-temperature conditions of mineralization, with abnormal paragenesis of the three sulfides--first galena, then sphalerite, then marcasite-pyrite. The origin is secondary, resulting from solution and redeposition of material derived from hydrothermal ores in basement rocks, with transportation of the lead and zinc by complex chlorides. The diapirism and mineralization are closely related, having a common cause in an active fault zone. Furthermore, the presence of the diapir has affected the ore deposition in two ways--mechanically, by opening and maintaining channelways, and chemically by maintaining the salinity of the solutions.

scholarly journals Apatite low-temperature chronometry and microstructures across a hydrothermally active fault zone

2021 ◽  
pp. 120633
Author(s):  
Alfons Berger ◽  
Daniel Egli ◽  
Christoph Glotzbach ◽  
Pierre G. Valla ◽  
Thomas Pettke ◽  
...  
Keyword(s):  
Low Temperature ◽  
Fault Zone ◽  
Active Fault ◽  
Active Fault Zone

RESISTIVITY OF TmSe UNDER PRESSURE AT VERY LOW TEMPERATURE

1980 ◽  
Vol 41 (C5) ◽  
pp. C5-177-C5-180
Author(s):  
J. Flouquet ◽  
P. Haen ◽  
F. Holtzberg ◽  
F. Lapierre ◽  
J. M. Mignot ◽  
...  
Keyword(s):  
Low Temperature ◽  
Very Low Temperature

Can fluorosyl hydride be formed or even prepared?

1990 ◽  
Vol 55 (4) ◽  
pp. 890-895
Author(s):  
Rudolf Zahradník ◽  
B. Andes Hess
Keyword(s):  
Low Temperature ◽  
Quantum Chemical Calculations ◽  
Quantum Chemical ◽  
Solid Matrix ◽  
Vibrational Characteristics ◽  
Very Low Temperature

HFO and HClO (fluorosyl and chlorosyl hydrides) and isomeric molecules HOF and HOCl (hypofluorous and hypochlorous acids) have been studied theoretically. On the basis of nonempiracal quantum chemical calculations (MP2, MP4 and CCD/6-311G**) geometry, energy and vibrational characteristics are analyzed and it is concluded that there is a poor chance to observe formation of HFO. Possibly, bombardment of HF in a solid matrix by 16O could lead at very low temperature to HFO.

scholarly journals Silver‐Promoted High‐Performance (Ag,Cu)(In,Ga)Se 2 Thin‐Film Solar Cells Grown at Very Low Temperature

Solar RRL ◽  
2021 ◽  
pp. 2100108
Author(s):  
Shih-Chi Yang ◽  
Jordi Sastre ◽  
Maximilian Krause ◽  
Xiaoxiao Sun ◽  
Ramis Hertwig ◽  
...  
Keyword(s):  
Thin Film ◽  
Solar Cells ◽  
Low Temperature ◽  
High Performance ◽  
Thin Film Solar Cells ◽  
Very Low Temperature

Approaches to Cyclopropa-Fused Quinones. The Synthesis and Photolysis of Some 4,9-Disubstituted 3,3-Dimethyl-3H-benz[f]indazoles

2003 ◽  
Vol 56 (9) ◽  
pp. 903 ◽  
Author(s):  
Gavin E. Collis ◽  
Dieter Wege
Keyword(s):  
Low Temperature ◽  
Functional Group ◽  
Alkoxy Group ◽  
The Other ◽  
Acetoxy Group

Addition of 2-diazopropane to 1,4-naphthoquinone at low temperature, followed by in situ enolization and acetylation or silylation gave 3,3-dimethyl-1H-benz[f]indazol-4,9-diyl diacetate and 3,3-dimethyl-9-(t-butyl-dimethylsilyloxy)-1H-benz[f]indazol-4-ol, respectively. Functional group manipulation of the latter compound provided a number of other 4,9-disubstituted 3,3-dimethyl-3H-benz[f]indazoles. Irradiation of the diacetate led to clean extrusion of nitrogen to give the naphtho[b]cycloproparene and an alkene. Attempts to elaborate the cycloproparene into the derived cyclopropanaphthoquinone were unsuccessful. Of the other 4,9-disubstituted 3,3-dimethyl-3H-benz[f]indazoles examined, only the compound possessing an acetoxy group at C9 was photoactive, and afforded the expected cycloproparene and alkene. Compounds bearing a hydroxy or alkoxy group at C9 were photochemically inert.

Electron drift caused by rf field gradient creates many plasma phenomena: An attempt to distinguish the cause and the effect

2011 ◽  
Vol 78 (2) ◽  
pp. 165-174 ◽  
Author(s):  
C. L. XAPLANTERIS ◽  
E. D. FILIPPAKI ◽  
I. S. MISTAKIDIS ◽  
L. C. XAPLANTERIS
Keyword(s):  
Experimental Data ◽  
Steady State ◽  
Low Temperature ◽  
Mathematical Models ◽  
Field Gradient ◽  
Collision Frequency ◽  
The Other ◽  
Frequency Effect ◽  
Electron Drift ◽  
Plasma Parameters

AbstractMany experimental data along with their theoretical interpretations on the rf low-temperature cylindrical plasma have been issued until today. Our Laboratory has contributed to that research by publishing results and interpretative mathematical models. With the present paper, two issues are being examined; firstly, the estimation of electron drift caused by the rf field gradient, which is the initial reason for the plasma behaviour, and secondly, many new experimental results, especially the electron-neutral collision frequency effect on the other plasma parameters and quantities. Up till now, only the plasma steady state was taken into consideration when a theoretical elaboration was carried out, regardless of the cause and the effect. This indicates the plasma's complicated and chaotic configuration and the need to simplify the problem. In the present work, a classification about the causality of the phenomena is attempted; the rf field gradient electron drift is proved to be the initial cause.

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