List of top Geology Questions on Geochronology asked in IIT JAM GG

In a mineralized staurolite-garnet-biotite schist, the estimated metasomatic sulfide mineralization is 4%, with ore mineral proportions of 30% chalcopyrite, 20% pyrite, and the rest being magnetite. The maximum grade of Cu will be _ __ _ g/ton (Round off to the nearest integer)

One mole of a parent nuclide is undergoing radioactive decay. The fraction of atoms of this nuclide that has decayed after three half-lives is.................

In the \(^{87}Rb-^{87}Sr\) isotopic systematics applied to terrestrial rocks, the slope of the isochron \( (e^{\lambda t} - 1) \) can be approximated as \( \lambda t \), where \( \lambda \) is the decay constant and \( t \) is time. Choose the correct option that justifies this approximation.

Choose the material on which \(^{14}C\) dating technique can be correctly applied.

The given section with uniform lithology and sedimentation rate records two ash layers dated at 77 Ma and 76 Ma, respectively. An index fossil species present in the lower part of the section becomes extinct at a horizon 7 m above the base. The estimated age of the extinction event is _________ Ma. (Answer in integer.)

If the activity of a radioactive mineral falls from 800 counts/s to 500 counts/s in 80 minutes, the half-life of the mineral is ________ minutes. (Round off to two decimal places.)

The number of alpha (\(\alpha\)) particles emitted to produce a daughter isotope of \(^{206}\text{Pb}\) from a parent isotope of \(^{238}\text{U}\) by radioactive decay is ........