Model Studies of Salt-Dome Tectonics

摘要: In a great many models constructed of various materials and analyzed in accordance with the theory scale models, asphalt was most nearly satisfactory material found to represent salt, weak muds greater density than were be best suited sedimentary overburden above salt. The motivating force causing upward growth model domes produced by contrast densities materials. Single initiated laboratory irregularities on original surface, variations thickness, lateral density, deformation which normal faulting overburden, folding resulting from externally applied forces. flowage into dome peripheral sink asphalt, turn caused initiation group secondary circular arrangement about margins sink. It appears, therefore, that it is not necessary call upon separate geologic event account for each known salt dome. Furthermore, no linear should expected if are origin. diameters approximately equal thickness source layers they developed. Attempts form large thin beds entirely unsuccessful. If similar relationship between diameter source-bed exists basins, layer salt-dome provinces Gulf Coastal Plain must several thousands feet thick. When top exceeded certain value, further movement occurred provided had finite shear strength. actual required prevent depended height its layer, equivalent, strength overburden. considered dimensionally correct, this critical same as layer. Although displayed variety shapes early stages their development, depending method employed, became horizontal cross section grew through successive an entered low near surface model, upper part commonly increased diameter. arched fractured domes. Beds penetrated core broken radial fractures, triangular segments these fractures upturned rising asphalt. Layers faults. Grabens over centers result uplift marginal fault segments; faults numerous. patterns controlled size shape core, depth beneath faulted amount configuration sink, physical properties