2 years, 7 months ago
When was the last superplume?
Are superplumes caused from a rupture in the core mantel boundary region?
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M$1 Answer
The last superplume occured during the Cretaceous period. It is referred to as the "The Cretaceous Superplume."
The term superplume was use by Roger Larson in the early 1990's. His two geological short papers{Larson (1991a) and Larson (1991b)} where cited for creating the concept of superplume.
----quote----
The term superplume has been used in different ways in the literature as..
* a broad zone of mantle upwelling (many thousands of km's across) comprising the return flow from subduction (Larson, 1991b )
* a mantle plume sufficiently large that, when the plume head spreads at the base of the lithosphere, it achieves a diameter of 1500-3000 km (Condie et al., 2002) .
According to Condie et al. (2001) , a superplume event is a
* a short-lived mantle event (100 Ma) during which many superplumes as well as smaller plumes bombard the base of the lithosphere
----qutoe----
information quoted from http://serc.carleton.edu/research_education/cretaceous/superplume.html
----quote----
What was the cause of the Cretaceous superplume event?
No one really knows what causes superplume events, but it is believed that some mechanism that traps and then catastrophically releases heat from the core-mantle boundary may be responsible. One possibility which has been proposed involves the sinking of subducted slabs to the core-mantle boundary where they trap and build up heat over long periods of time. An animation illustrating this model of superplume formation has been created by Eh Tan and Michael Gurnis at Cal Tech: Superplume Formation Beneath An Ancient Slab (more info) .
----quote----
information quoted from http://serc.carleton.edu/research_education/cretaceous/superplume.html
The term superplume was use by Roger Larson in the early 1990's. His two geological short papers{Larson (1991a) and Larson (1991b)} where cited for creating the concept of superplume.
----quote----
The term superplume has been used in different ways in the literature as..
* a broad zone of mantle upwelling (many thousands of km's across) comprising the return flow from subduction (Larson, 1991b )
* a mantle plume sufficiently large that, when the plume head spreads at the base of the lithosphere, it achieves a diameter of 1500-3000 km (Condie et al., 2002) .
According to Condie et al. (2001) , a superplume event is a
* a short-lived mantle event (100 Ma) during which many superplumes as well as smaller plumes bombard the base of the lithosphere
----qutoe----
information quoted from http://serc.carleton.edu/research_education/cretaceous/superplume.html
----quote----
What was the cause of the Cretaceous superplume event?
No one really knows what causes superplume events, but it is believed that some mechanism that traps and then catastrophically releases heat from the core-mantle boundary may be responsible. One possibility which has been proposed involves the sinking of subducted slabs to the core-mantle boundary where they trap and build up heat over long periods of time. An animation illustrating this model of superplume formation has been created by Eh Tan and Michael Gurnis at Cal Tech: Superplume Formation Beneath An Ancient Slab (more info) .
----quote----
information quoted from http://serc.carleton.edu/research_education/cretaceous/superplume.html
You can leave an optional "tip" with Mahalo's virtual currency, Mahalo Dollars. If you are asking a difficult question that might require some research, or if you'd like a wide variety of feedback, a higher tip often leads to more answers to your question.
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