DYNAMIC ANALYSIS OF THE RELATIONSHIP BETWEEN PINE MOUNTAIN THRUST AND THE JACKSBORO FAULT SYSTEM IN THE PIONEER QUADRANGLE, TENNESSEE

Pine Mountain Thrust is the northwestern boundary of the Cumberland Mountain over-thrust block that moved towards the northwest during the Alleghanian Orogeny. Pine Mountain Thrust intersects with the Jacksboro Fault System to compose the western boundary of the Cumberland Mountain over-thrust block in the Pioneer Quadrangle of Tennessee. Associated with this intersection is the Terry Creek Fault. The stratigraphic sequence throughout Pioneer belongs to Silurian Rockwood Formation, Devonian Chattanooga Formation, with the Fort Payne Chert, Newman Limestone, and Pennington Formation in the Mississippian, and units from Lower Pennsylvanian Gizzard Group to Vowell Mountain Formation in the Upper Middle Pennsylvanian. Shale beds are dominant in most units, except for in Lower and Middle Mississippian units where limestone, chert and dolomite are present and in Lower Pennsylvanian units where sandstones and conglomerates are dominant. This study focused on deformation along the Jacksboro Fault System and the relationship with the Pine Mountain Thrust in the Pioneer Quadrangle. There is large anticline along the Jacksboro on the hanging wall, with a fold within the anticline due from local transpressional conditions. There is evidence of strain partitioning of thrust and strike-slip displacement with tear faults on the hanging wall. Along the Jacksboro is a horst and graben system, with a detachment fault on the footwall that parallels the Jacksboro, which suggests that the Jacksboro was trying to restore its fault angle due to changes from transpressional conditions. On the footwall of Pine Mountain Trust are the Woodridge Syncline and the Terry Creek Fault, which are both compressional structures that formed from the advancement of the thrust and possibly from the result of duplexing of the thrust. Transpressional conditions are important in the relationship with Pine Mountain Thrust and Jacksboro Fault. It is conceivable to suggest that transpressional conditions affect the contact between these two faults and even there fault angles in this area.