An analysis of a sample rock from layer H indicates an equal proportion of paren

Question

An analysis of a sample rock from layer H indicates an equal proportion of parent isotope and daughter produced from the parent. Fifty percent of the original parent has decayed to the daughter of the product. The half-life of the parent is known to be 425 million years. The analysis of a sample of rock from layer I indicates its age to be 400 million years.

a. How many half-lives of the parent isotope have elapsed since rock H formed?

b. What is the numerical age of rock layer H?

c. How many years long is the interval of time represented by the unconformity that separates rock layer H from layer I?

d. Is the age of fault M older or younger than 400 million years?

e. What is the approximate maximum numerical age of the igneous intrusion L?

f. Complete the following general statement, first choose the correct option, then fill in the blank for the numerical ages of rock layers G, F, and E?

All of the rock layers are (younger, older) than ( ) million years

Explanation / Answer

answer -Given- H layers represent 50% of parent and 50% of daughter rock , half life of parent rock means Strata A is 425 Million year., sample is taken from H layer whose age is about 400 Million year.

answer a- only one half life of parents isotope have been elapsed since rock A is formed becuase H layer represent of 50% of parents and 50% of daughter rock

answer d- fault M is Older than layer I whose age is about 400 million years becuase it lies below the layer of angular unconfomity if it occured after the depostion of I layer then Displacement of fault layer can also seen in I layers.

answer f- all the rock layer are older than 400 million year. because all layers G, F, E lies below the layer of Unconformity so they should be older than 400 million year

answer e- the approxnimately age of igneous intrusion L is about 300-350 million year. It occurs after the depostion of layer J according to the law of cross cutting relationship and layer J is lies above Layer I whose age is about 400 Million year. and according to law of super position layer J is younder than layer I.

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