Remanent Magnetism in Jurassic Red Limestones and Radiolarites from the Alps

摘要: Summary Red Jurassic limestones and radiolarites from the Kammerkohr range on Austrian-German frontier show rather consistent remanent magnetic vectors. The average North Pole position for lower rocks (red limestones) is latitude 53" N, longitude I 12O E Middle radiolarites) 58"-5 128O E. I. Introduction In Northern Calcareous Alps major portion of system represented by a thin section (of order 100-200m) fine-grained marine rocks, varying grey red (the Kieselknollenkalk, cephalopod limestone, Knollenkalk, Adneth beds, etc.) to maroon or greenish radiolarites-impure, calcareous cherty replete with remains radiolarian tests. 1957 Fischer measured detailed this sequence, collected oriented samples analysis. This was carried out Hargraves, "spinner"-type magnetometer, kindly made available Geophysical Laboratory United States Geological Survey, through courtesy Dr James R. Balsley. For financial support we are indebted Socony Mobil Oil Company, Inc., its affiliate, Magnolia Petroleum funds Eugene Higgins Trust allocated Princeton University; stimulation encouragement Professors A. F. Buddington Franklyn B. Van Houten. 2. Location profile sampled exposed west face Scheibelberg in range. It lies essentially German-Austrian frontier, very near boundary between Austrian provinces Salzburg Tirol. co-ordinates 47O 37''s 34''s structure area simple. flat-lying, axis an open syncline which plunges gently eastward, vanish at Lofer, some Iokm east, under Berchtesgaden thrust sheet. There question as whether adjacent place, transported part Various thrusts have been mapped farther north, .along Alpine margin, analogy western various geologists believed these be flat. adherents view assume that one more present depth below