Click for more detail This dynamic hardy perennial has flashy gold and green foliage that gradually ages to cream and gold.
The vigorous plants are topped in mid-summer with lots of hot pink flowers.
If we know the absolute age of Shallowater, we can then calculate absolute ages of other samples from the age difference between it and Shallowater.
Two inclusions from the Allende meteorite exhibit multiple I-Xe isochrons corresponding to an age difference of 3.7 ± 1.5 m.y.
One such radiometric dating system is the iodine-xenon (I-Xe) chronometer.
Anomalies in I – a so-called “short-lived isotope”, which has a half-life of 16.1 million years, and so is now extinct.
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The IAB iron meteorites may be related to the chondrites: siderophile elements in the metal matrix have chondritic abundances, and the abundant silicate inclusions are chondritic both in mineralogy and in chemical composition.
Silicate and troilite (Fe S) from IAB irons were analyzed by the I-Xe technique.
One radioactive species (the “parent”) decays to produce a different, stable species (the “daughter”), which then gets trapped inside the asteroid, moon, or other body.
We look for anomalies in those daughter species (or isotopes) which were produced by the radioactive decay of parent, and by measuring the ratio of the daughter to the parent or another stable species, we can determine the ages of meteorites, moon rocks, and their components.