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The AAPG/Datapages Combined Publications Database
Pacific Section of AAPG
Abstract
Structural
Geology of the Sacramento Basin: 1992 Pacific Section Annual Convention,
Sacramento Valley Lineaments, Identification and Origin
Abstract
Alignments and trends of surface features (faults, joints and selected outcrops), subsurface featurees (faults, folds, structural
contours and boundaries of large gravity anomalies), visible on geologic and geophysical
maps
, and lineaments apparent on satellite imagery define a series of sixteen linear features in the Sacramento Valley and its border elements. These lineaments are also coincident with changes in symmetry of major
structural
features. A series of right-lateral shears, normal to the dominant northwest-southeast
structural
grain, may have developed during the Neogene, when the Mendocino triple junction migrated northward outboard of the present-day Valley, or the lineaments may have a more ancient origin. Speculation is offered with respect to their origin and possible exploration significance.
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