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Nilanjan Bhowmick AIR 3, CSIR NET (Earth Science)
Shivam Sharma posted an Question
September 10, 2020 • 16:35 pm
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30 points
30 points
- CSIR NET
- Earth Sciences
What will be the thickness of a moving oceanic lithosphere at a distance of 100 km from the mid-oceanic ridge, given the average plate velocity of 1 mm/yr? a. l
What will be the thickness of a moving oceanic lithosphere at a distance of 100 km from the mid-oceanic ridge, given the average plate velocity of 1 mm/yr? A. less than 50 km B. between 50 and 100 km between 100 and 150 km D. more than 150 km
2 Answer(s)
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Veer vikram singh Best Answer
plate moves 1 mm = 10^-3 m in a year time taken to move 100km (100 X 10^3m) = (100 X 10^-3)/(10^-3) = 100 X 10^6 years = 100 million years
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Veer vikram singh
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The thickness of plate increase from about 50km at oceanic ridge to about 110 kilometres at maturity. beyond which it remains constant.
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the thickness of plate increase till about 100 million years and become constant after 100Ma. in the given case the age of the plate is calculated as 100 Ma means the plate has reached the maturity. in the book it has written that at maturity the thickness of plate is about 110 km. hence in our case the thickness will be about 110 Km
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Rahul kumar
Answer (C) Between 100 km to 150 km Explanation: As you know that thickness of lithosphere increases with the distance from MOR. Thickness can-not increased always due to isostatic reasons so there must be an equilibrium thickness after which lithospheric thickness can't be increased. Now, according to the question the lithospheric point in consideration is already 100km far from the spreading center and 100 million years old; so the lithospheric thickness would be maximum at this point. You also know that the average lithospheric thickness ranges from 100-150 Kms and it must have been attained at the given point; since equilibrium thickness should be reached by 100 million years and 100km distance from spreading center.. So, the answer would be C (100-150km).