Passive margin definitions
| Word backwards | evissap nigram |
|---|---|
| Part of speech | Noun phrase |
| Syllabic division | pas-sive mar-gin |
| Plural | The plural of the word "passive margin" is "passive margins." |
| Total letters | 13 |
| Vogais (3) | a,i,e |
| Consonants (7) | p,s,v,m,r,g,n |
Passive Margin
Definition of Passive Margin
A passive margin is the transition region from the continent to the deep ocean in which there is no significant geological activity. It contrasts with active margins where tectonic activity such as earthquakes and volcanism is present.Characteristics of Passive Margin
Passive margins are typically found on the trailing edges of continents. They are characterized by a wide continental shelf that gently slopes into the ocean basin. Sediments accumulate on the continental shelf and slope, forming thick layers over time. The lack of tectonic activity means that there are no major geological events like mountain building or earthquakes.Formation of Passive Margin
The formation of a passive margin starts with the rifting of a continent, which creates a depression or basin that eventually fills with water. As the continents drift apart, the space between them widens, and a new ocean basin forms. Sediments eroded from the continent are deposited on the continental shelf, creating layers of sedimentary rocks. Over time, these sediments can be buried and compacted, forming sedimentary rocks such as sandstone and shale.Importance of Passive Margins
Passive margins are important areas for oil and gas exploration. The thick layers of sedimentary rocks that accumulate on the continental shelf can contain significant reserves of hydrocarbons. Companies often target passive margins for exploration and drilling activities due to the potential for large oil and gas deposits. Additionally, passive margins are also important for studying Earth's geological history and understanding the processes that shape the planet's surface.Passive margin Examples
- The South Atlantic passive margin is characterized by wide continental shelves.
- Oil exploration in the Gulf of Mexico often focuses on the passive margin of the continental shelf.
- The west coast of Africa is an example of a passive margin with minimal tectonic activity.
- Passive margins are typically associated with thick sequences of sedimentary rocks.
- The eastern coast of North America is considered a passive margin with a stable continental shelf.
- Passive margins can experience submarine landslides due to the accumulation of sediment on the continental slope.
- The lack of major faulting is a characteristic feature of a passive margin.
- The retreat of glaciers during the last ice age exposed the passive margin of the northern Atlantic coast.
- Passive margins can be influenced by sea level changes, leading to the formation of erosional features.
- The presence of carbonate platforms is common on some passive margins, such as the Bahamas.