wiül uit uppropi at each location. The eclogite sample has been done for you min
ID: 286947 • Letter: W
Question
wiül uit uppropi at each location. The eclogite sample has been done for you mind that although this diagram depicts a subduction zone, it also shows other types of metamor- ock name that correspohds tions 200 C, 400 C, 800°C and 1000 C isotherms on the diagram below (refer to the pre-lab reading) To 500 C isotherm has been drawn as a dotted line. Note that the isotherm is not a straight line. The cting lithosphere and the hotter magma cause the isotherm to bend. therms should behave similarly, so use the 500°C isotherm as a guide. Kesp in mind that the.coolest : Proto Protolith: shale State Oceanic Geothermal Gradient granite 500 C 1000C magma asthenosphere Protolith: basalt reen one ntact Protolith: basalt -hiah temp Eclogite Cimtrusian) (oco press re votcasio javt anges ona tectonisExplanation / Answer
a. Each isotherm represents a temperature within the earth, and as the isotherms are placed more closely they will represent in the change in the temperature values i.e., the change will be more quickly whereas comparing to that of the isotherms that are placed at the greater distance will show a slow increase in the temperature values.
b. At the point A we have the value for depth = 50 Km
And for the figure, we assume the value of temperature will be = 400 oC
So, Geothermal gradient can be calculated as,
Geothermal gradient = (Temperature at the location)/(Depth at that location)
= 400 oC / 50 Km =8 oC/Km.
So, Geothermal gradient at the location A is 8 oC/Km.
c. Ecologite are broken into fragments and somehow squeezed to the surface as tectonic blocks, accretionary wedges, piles of sediment form above subduction zone, often contain high-grade rocks such as eclogite.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.