Isotope methods for dating old groundwater

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Groundwater Age

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Dating of Old Groundwater — History, Potential, Limits and Future | SpringerLink

Radiocarbon dating also referred to as carbon dating or carbon dating is a method for determining the age of an object containing organic material by using the properties of radiocarbon , a radioactive isotope of carbon. The method was developed in the late s at the University of Chicago by Willard Libby , who received the Nobel Prize in Chemistry for his work in It is based on the fact that radiocarbon 14 C is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen. The resulting 14 C combines with atmospheric oxygen to form radioactive carbon dioxide , which is incorporated into plants by photosynthesis ; animals then acquire 14 C by eating the plants. When the animal or plant dies, it stops exchanging carbon with its environment, and thereafter the amount of 14 C it contains begins to decrease as the 14 C undergoes radioactive decay.
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The Reston Groundwater Dating Laboratory

Use the controls in the far right panel to increase or decrease the number of terms automatically displayed or to completely turn that feature off. Figure 1 - Sea level reconstruction from , years ago to the present. The downward-pointing red arrows indicates peaks in sea level rise exceeding 1. The break in the record is due to the absence of foraminifera upon which the reconstruction is based as a result of excessively salty seawater during the last ice age. Adapted from Grant
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Although there are currently no active volcanoes in New Mexico, many extinct volcanoes are preserved in the state. Lava flows near Grants and Carrizozo are the youngest volcanic flows in the state about years old and years old, respectively. Shiprock is usually referred to as a special volcanic landform called a volcanic neck , which is the solidified feeder system of a volcano. Steve Semken suggests that lava that makes up Shiprock interacted explosively with groundwater, forming a diatreme.
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