Geomechanics and Fracture Analysis

Field Trip Leader: Frank Mattern, Sultan Qaboos University (SQU)
Date: 12th December
Time: 8am – 5pm
Fee: $170
Registration for the field trip is now closed

The field trip will lead to the Sunub/Ansab area to discuss the postobductional extensional, NW-striking Frontal Range Fault which formed in the course of gravitational collapse of the Saih Hatat and Jabal Akhdar domes. The fault is marked by the occurrence of listwaenite. The vertical displacement amounts to a few to several kilometers. Shearing ensued in two intervals, during the late Cretaceous to early Eocene and probably Oligocene. At this fault segment, the first stage is characterized by extension. The second stage is marked by dextral motion, including local transtension. The listwaenite dispalys the unusual feature of a ductile shear zone which trends obliquely to the Frontal Range Fault.

At the hot spring of Hammam Al Ali the Frontal Range Fault is superbly exposed. The presence of the hot spring may well be related to the fault’s transtensional releasing bend as well as the occurrence of a nearby basalt which intruded the Paleocene-Eocene Jafnayn Formation.

Gravitational collapse also created contractional structures due to E-W compression. Near Jafnayn, a wide open syncline in Eocene formations will be shown whose axis trends N-S, and on the SQU campus a syndepositional, E-dipping Miocene thrust formed within the Barzamen Formation. It displays ramps and an intervening flat. In Al-Khod Village, pillow basalt was pressed over a mudflow deposit along a west-dipping reverse fault. The two compressive faults could have formed coeval conjugate faults. Compression is related to convergence of downthrown hanging wall blocks.

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