14.7: Chapter Summary
- Page ID
- 21560
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\(\newcommand{\avec}{\mathbf a}\) \(\newcommand{\bvec}{\mathbf b}\) \(\newcommand{\cvec}{\mathbf c}\) \(\newcommand{\dvec}{\mathbf d}\) \(\newcommand{\dtil}{\widetilde{\mathbf d}}\) \(\newcommand{\evec}{\mathbf e}\) \(\newcommand{\fvec}{\mathbf f}\) \(\newcommand{\nvec}{\mathbf n}\) \(\newcommand{\pvec}{\mathbf p}\) \(\newcommand{\qvec}{\mathbf q}\) \(\newcommand{\svec}{\mathbf s}\) \(\newcommand{\tvec}{\mathbf t}\) \(\newcommand{\uvec}{\mathbf u}\) \(\newcommand{\vvec}{\mathbf v}\) \(\newcommand{\wvec}{\mathbf w}\) \(\newcommand{\xvec}{\mathbf x}\) \(\newcommand{\yvec}{\mathbf y}\) \(\newcommand{\zvec}{\mathbf z}\) \(\newcommand{\rvec}{\mathbf r}\) \(\newcommand{\mvec}{\mathbf m}\) \(\newcommand{\zerovec}{\mathbf 0}\) \(\newcommand{\onevec}{\mathbf 1}\) \(\newcommand{\real}{\mathbb R}\) \(\newcommand{\twovec}[2]{\left[\begin{array}{r}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\ctwovec}[2]{\left[\begin{array}{c}#1 \\ #2 \end{array}\right]}\) \(\newcommand{\threevec}[3]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\cthreevec}[3]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \end{array}\right]}\) \(\newcommand{\fourvec}[4]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\cfourvec}[4]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \end{array}\right]}\) \(\newcommand{\fivevec}[5]{\left[\begin{array}{r}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\cfivevec}[5]{\left[\begin{array}{c}#1 \\ #2 \\ #3 \\ #4 \\ #5 \\ \end{array}\right]}\) \(\newcommand{\mattwo}[4]{\left[\begin{array}{rr}#1 \amp #2 \\ #3 \amp #4 \\ \end{array}\right]}\) \(\newcommand{\laspan}[1]{\text{Span}\{#1\}}\) \(\newcommand{\bcal}{\cal B}\) \(\newcommand{\ccal}{\cal C}\) \(\newcommand{\scal}{\cal S}\) \(\newcommand{\wcal}{\cal W}\) \(\newcommand{\ecal}{\cal E}\) \(\newcommand{\coords}[2]{\left\{#1\right\}_{#2}}\) \(\newcommand{\gray}[1]{\color{gray}{#1}}\) \(\newcommand{\lgray}[1]{\color{lightgray}{#1}}\) \(\newcommand{\rank}{\operatorname{rank}}\) \(\newcommand{\row}{\text{Row}}\) \(\newcommand{\col}{\text{Col}}\) \(\renewcommand{\row}{\text{Row}}\) \(\newcommand{\nul}{\text{Nul}}\) \(\newcommand{\var}{\text{Var}}\) \(\newcommand{\corr}{\text{corr}}\) \(\newcommand{\len}[1]{\left|#1\right|}\) \(\newcommand{\bbar}{\overline{\bvec}}\) \(\newcommand{\bhat}{\widehat{\bvec}}\) \(\newcommand{\bperp}{\bvec^\perp}\) \(\newcommand{\xhat}{\widehat{\xvec}}\) \(\newcommand{\vhat}{\widehat{\vvec}}\) \(\newcommand{\uhat}{\widehat{\uvec}}\) \(\newcommand{\what}{\widehat{\wvec}}\) \(\newcommand{\Sighat}{\widehat{\Sigma}}\) \(\newcommand{\lt}{<}\) \(\newcommand{\gt}{>}\) \(\newcommand{\amp}{&}\) \(\definecolor{fillinmathshade}{gray}{0.9}\)14.1 Physiographic Overview of the Transverse Ranges Province
- The Transverse Ranges Province is an east-west oriented region in southern California.
- This region consists of east-west trending basins and uplifted ranges.
14.2 Bedrock Geology of the Transverse Ranges Province
- Igneous and metamorphic rocks as old as Proterozoic-Late Mesozoic are uplifted in ranges of in this region.
- An unusual anorthosite complex is included in the Proterozoic rocks.
- Mesozoic meta-sediments preserved in uplifted ranges are similar to the Franciscan Assemblage found along the Coast Ranges.
- Mesozoic plutonic rocks are similar to those found elsewhere in California, in regions where the ancient arc magma chamber is preserved.
14.3 Cenozoic Sedimentation and Basin Development
- Numerous deep basins throughout the region preserve sediments that date back to Late Cretaceous ages and are deformed by reverse faulting and folding.
- Important basins are the Ventura-Soledad Basin in the Western Transverse Ranges and the extensive Los Angeles Basin, which is on the boundary of the Peninsular Ranges Province.
- Basin sediments are mostly marine, but include periodic deposits of non-marine units.
- The Sespe Fm. (Oligocene) is a collection of non-marine sands and conglomerates which records regional uplift.
- The Miocene Monterey Formation (and its equivalents) is found in most basins and is the origin of petroleum deposits in this region.
14.4 Tectonic and Structural Evolution
- This portion of California’s plate boundary changed from one of subduction to one of transform activity in the Middle to Late Cenozoic.
- Large portions of the Transverse Ranges originated southward and have been carried into their current positions along with significant rotation in the Late Cenozoic.
- The development of the Big Bend along the emerging San Andreas Fault system created a restraining bend in this region which produced transpressional deformation that resulted in uplifted ranges, deformed basins and crustal thickening.
- The Transverse Ranges continue to be compressed in a north-south sense by reverse faulting and left-lateral shearing.
14.5 Geologic Hazards of the Transverse Ranges Province
- This region has significant earthquake hazards from both strike-slip and reverse faults.
- Earthquakes in this region prompted new legislation and have prompted the creation of collaborative studies of the seismic risk.
- Flooding is a seasonal hazard in this region due to extreme weather events; these events are both natural and man-made.
- Past flood events greatly impacted the region and led to measures to control river responses.
- Landslides are widespread due to steep terrain and many areas of frictionally weak rock and continue to be a concern for residents.
14.6 Mineral and Petroleum Resources of the Transverse Ranges Province
- The basin deposits of this area contain large reserves of oil and gas derived from Miocene sedimentary rocks.
- Oil production has been going on for more than 100 years in this region.
- Mining activities centered on resources derived from sedimentary rocks occur in this region.