A) Every Pb2+ atom detected in the zircon sample must be the result of radioactive decay, while some Pb2+ atoms found in sphene could have been incorporated during its formation.
Explanation:
The reason why the geochemist will prefer to use the ziron which takes the 4+ cation would be because, every Pb2+ atom detected in the zircon sample must be the result of radioactive decay, while some Pb2+ atoms found in sphene could have been incorporated during its formation.
✓ The Pb 2+ produced the daughter isotopes of the radioactive decays.
✓ To properly date the rock sample, any external source of the daughter isotopes should be eradicated.
✓ This will help to establish a fair ratio between the parent and daughter isotopes in order to track the decay rate.
✓ This is why the Zircon would be preferred to the Sphene.
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Typing it into a percentage calculator I got 99
Answer:
Sediment is deposited in a river delta because the river slows down.
Explanation:
As the river slows down, it collects surrounding sediments.
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The three main rock formations are the late-Precambrian Malmesbury group (sedimentary and metamorphic rock), the Peninsula granite, a huge batholith that was intruded into the Malmesbury Group about 630 million years ago, and the Table Mountain group sandstones that were deposited on the eroded surface of granite and Malmesbury series basement about 450 million years ago. The sand, silt and mud deposits were lithified by pressure and then folded during the Cape Orogeny to form the Cape Fold Belt, which extends along the western and southern coasts. The present landscape is due to prolonged erosion having carved out deep valleys, removing parts of the once continuous Table Mountain Group sandstone cover from the Cape Flats and leaving high residual mountain ridges.[1]
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