Essay - This Paper Looks at the Role of Potassium Argon Dating...

This paper looks at the role of potassium argon d*****ing within the field of archaeology. How it works and what methods are used to glean the date from archaeological artefacts and remains.

Potassium argon and ***** archaeologist

The majority of the world's archaeological sites are now so ancient that there is no actual way of giving them a complete and secure chro*****logical date that radio-carbon dating can provide. *****ever,here are many techniques for ***** within the field of archaeology, one of ********** methods is the The K-Ar (Potassium-Argon) method which has been a vast success within the field of geology (the study of earth).

It ***** possible ***** date rocks with a low ***** content such *****s basalts in this way. Sadly the dates are not always secure due to the behaviour of the geochemicals of ***** parent ***** daughter elements as they are likely to being disturbed by geological events ***** as weathering or reheating ***** normally take place during the formation ***** a rock. Potassium ***** dating allows scientists ***** date volcanic *****s between two billion and 100,000 years old.

Many of ***** early hominid ***** ***** found in ********** active regions, tools used by our earliest ancestors can be found in cooled lava rock fragments or the ash ***** ***** sporadic eruptions at the time. It has ***** these *****stances th***** have allowed archaeologists to date the remains found at East Turkana. Famous finds in this ***** have ********** ***** at Olduvai Gorge along with many others.

Potassium argon dat*****g as noted above concerns the elements that are found *****in the minerals within ***** ********** crust. In its natural form potassium only contains a small amount of radioactive K40 atoms. With every 100 K40 atoms ***** decay only 11 percent become argon, this is an inert gas that escapes its major material by a process of diffusion when lava *****d an other igneous rocks are formed.

However, as the volc*****ic rocks begins to form and crystallize ***** argon 40 concentration drops back to almost nothing, yet the ***** of ***** ***** K40 still continues, ***** percent of ***** every K40 then in its turn becomes argon 40. this makes it possible for a spectrometer ***** me*****sure concentration of argon 40 that has been collected since the volcanic rock originally formed.

***** ***** dating has ***** found in many igneous rocks ***** materials ********** biotite and muscovite. ***** rocks are crusted, concentrated ***** treated with hydrochloric acid that removes any atmospheric argon from the sample. Various gases ***** *****n removed; the argon gas is then ********** and tested with a subjection to mass spectrographic analysis.

***** the age sample is determined through calculating the use of ***** 40 and ***** 40 and ***** content ***** a standard formula, the dates delivered are given a st*****ndard deviation for early human sites on a r*****nge of a quarter million years.

*****in archaeology the method of potassium argon ***** has been ***** ***** date the time line of ***** hominids found