Thus, assigning age significance to a result requires studying the metasomatic and thermal history of the rock, any metamorphic events, and any evidence of fluid movement.A Rb-Sr date which is at variance with other geochronometers may not be useless, it may be providing data on an event which is not representing the age of formation of the rock.In the Middle Ages, these territories were inhibited mostly by the Ugrian tribes, ancestors of the present day Hungarians and Ob-Ugrians – the Khanty and the Mansi people.Their style is referred to as the 'Permian animal style.' First collections of these works of arts and their scholarly research date back to the end of the 19th century.Although this is a potential source of error for terrestrial rocks, it is irrelevant for lunar rocks and meteorites, as there are no chemical weathering reactions in those environments.Initial Nd ratios as well) the geological fingerprint of an object or skeleton can be measured, allowing migration patterns to be determined.
Rb-Sr can then be used on the altered mineralogy to date the time of this alteration, but not the date at which the rock formed.
The ideal scenario according to Bowen's reaction series would see a granite melt begin crystallizing a cumulate assemblage of plagioclase and hornblende (i.e.; tonalite or diorite), which is low in K (and hence Rb) but high in Sr (as this substitutes for Ca), which proportionally enriches the melt in K and Rb.
This then causes orthoclase and biotite, both K rich minerals into which Rb can substitute, to precipitate.
Despite over a century of research into the field, Perm animal style still remains one of the most mysterious cultural phenomena of Eurasia.
This can be explained by the absence of written tradition of its creators and lack of external historic evidence about the creators of the bronze images in the heyday of the animal style.
In addition, Rb is a highly incompatible element that, during partial melting of the mantle, prefers to join the magmatic melt rather than remain in mantle minerals. The radiogenic daughter, Sr, is produced in this decay process and was produced in rounds of stellar nucleosynthesis predating the creation of the Solar System.