What is a pull-apart basin give an example?
Examples. Two famous localities for continental pull-apart basins are the Dead Sea and Salton Sea. Pull-apart basins are amenable to research because sediments deposited in the basin provide a timeline of activity along the fault.
What makes the Salton Sea a pull-apart basin?
Oblique extension across strike-slip faults causes subsidence and leads to the formation of pull-apart basins such as the Salton Sea in southern California. The formation of these basins has generally been studied using laboratory experiments or numerical models1,2,3,4.
What is meant by sedimentary basin?
Sedimentary basins are the primary locations on the continents where sufficient subsidence exists for long-term preservation of continental sediments, and in fact may be the only locations where significant long-term preservation is possible. From: Geomorphology, 2015.
What is a Transtensional basin?
Transtensional basins form under strike-slip conditions in an extensional environment, while transpressional basins form under strike-slip conditions in a compressional environment; both types are categorized as strike-slip basins (Yang et al., 1999).
Where is the forearc basin located?
trench
Forearc basins are marine depositional basins on the trench side of arcs (Figure 3.16), and they vary in size and abundance with the evolutionary stage of an arc.
What is back arc basin in geology?
back-arc basin, submarine basin that forms behind an island arc. Such basins are typically found along the western margin of the Pacific Ocean near the convergence of two tectonic plates.
How did the Salton Trough form?
The Salton Trough is a result of crustal stretching and sinking caused by the combined actions of the San Andreas Fault and the East Pacific Rise, particularly the Gulf of California Rift Zone (GCRZ), the northernmost portion of the East Pacific Rise.
What is the Salton Sea?
The Salton Sea, located in southern Riverside and northern Imperial counties in Southern California, is California’ s largest lake (map at right). The Sea has since been maintained by irrigation runoff in the Imperial and Coachella valleys and local rivers.
What are the types of sedimentary basins?
| Types of sedimentary basins | |
|---|---|
| Rift-related basins | |
| Basin type | Geological Origin |
| Rift basin | The down-dropped basin formed during rifting because of stretching and thinning of the continental crust |
| Passive margin basin | Subsidence along a passive margin, mostly due to long-term accumulation of sediments on the continental shelf |
How sedimentary basins are formed?
Sedimentary basins are formed over hundreds of millions of years by the combined action of deposition of eroded material and precipitation of chemicals and organic debris within water environment.
What is the meaning of Transtension?
1. n. [Geology] The simultaneous occurrence of strike-slip faulting and extension, rifting, or divergence of the Earth’s crust.
What is Riedel shear?
The Riedel shears (also called R shears) are the small right-lateral faults which are gently inclined to the strike of the main fault. Their presence suggests overall right-lateral motion on the zone.
How is the depth of a pull apart basin related?
However, the depth of a pull-apart basin is a function of stretching associated with strike-slip displacement. In this study, comparison of data related to pull-apart basin scales from the literature suggests that the depth is related to the length and width.
Which is an example of an intracratonic sedimentary basin?
A good example is the Western Canada Sedimentary Basin extending from the eastern side of the Rocky Mountains to central Manitoba. Examples of a smaller intracratonic basins are the Proterozoic Athabasca Basin in Saskatchewan and the Mesozoic Bowser Basin in northwestern BC. A modern example is Hudson Bay.
Which is an example of a strike slip basin?
Pull-apart or strike-slip basins form along major transform faults where they bend, or between fault splays. They tend to be deep and narrow, and are characterized by very fast subsidence. There are some good examples along the San Andreas fault- zone. Accommodation
Why do sediments move out of a sedimentary basin?
When sediments accumulate, the basin in which they are being deposited will tend to subside because of isostasy. If a basin is filling up faster than the rate of subsidence then the deposition will move elsewhere –either to a new basin –or farther out into the ocean.