The potassium-argon K-Ar isotopic dating method is especially useful for determining the age of lavas. Developed in the s, it was important in developing the theory of plate tectonics and in calibrating the geologic time scale. Potassium occurs in two stable isotopes 41 K and 39 K and one radioactive isotope 40 K. Potassium decays with a half-life of million years, meaning that half of the 40 K atoms are gone after that span of time. Its decay yields argon and calcium in a ratio of 11 to The K-Ar method works by counting these radiogenic 40 Ar atoms trapped inside minerals.
In photos: Pope Francis spreads message of peace on first trip to Iraq
Potassium-Argon Dating Methods: K-Ar and Ar-Ar Dating
Why it matters: This is the first-ever papal trip to Iraq. The purpose of Francis' four-day visit is largely intended to reassure the country's Christian minority, who were violently persecuted by ISIS, which controlled the region from Stay on top of the latest market trends and economic insights with Axios Markets. Subscribe for free. The big picture: On the third day of his historic trip to Iraq, which is heavily featured in the Old Testament, the pope met at the the city of Erbil's airport Sunday with Nechirvan Barzani, the president of the autonomous region of Iraqi Kurdistan, and Masrour Barzani, the region's prime minister. The pontiff then flew by helicopter to the former ISIS stronghold of Mosul, where he led a prayer "amidst the ruins and along with the people of Iraq, for all the victims of war in the country and throughout the Middle East," per the Vatican News. On Saturday, he met with Grand Ayatollah Ali al-Sistani, the head of the Shiite Islam religious establishment in the holy city of Najaf, Iraq, where he denounced extremism in the country and pushed for peace.
Why is Saudi Arabia finally engaging with Iraq?
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