Chap. 8] 



MAGNETIC METHOD 



423 



1 . The magnetic location of salt domes was attempted shortly after the 

 introduction of the Schmidt magnetometer. In northern Germany, salt 

 domes produce negative anomalies by a combination of the following 

 effects: (a) diamagnetism of the salt, (6) diamagnetism of gypsum and 

 anhydrite in the cap rock where present, (c) paramagnetism of glacial 

 strata if salt dome is near surface, and possibly (d) slight paramagnetism 

 of Tertiary and Cretaceous sediments. Magnetic surveys on salt domes 



1 1 1 1 \a 



esf 



BiC 



T65 



YiG. 8-69. Magnetic anomalies on Port Barre salt dome (after Barret). 



were made by Schuh"* and Moll^^^ in Mecklenburg; by the author on the 

 salt domes of Segeberg and Lueneburg; by Haalck and Brinkmeier"" on 

 the salt dome of Wef ensleben ; by Kohl and Krahmann"^ on the salt 

 anticlines of Salzgitter and Benthen. Except on outcropping cap rocks, 



"sMecklenb. Geol. Survey, 32 (1920). 



169 Mecklenb. Geol. Survey, 33 (1922). 



''" Haalck, Die magnetischen Verfahren, p. 132. 



1" Metall und Erz., 23, 583-586 (1926); 26, 571-582 (1928). 



