discordant age
discordant age The situation in which a series of age determinations of a single rock body do not yield the same value (compare CONCORDANT AGE). Discordant ages indicate that some transfer of materials has taken place into or out of the rock or mineral, and this transfer could have affected either the parent or daughter nuclides, or both.
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Absolute Age , absolute age(true age) The age of a geologic phenomenon measured in present Earth years, rather than its age relative to other geologic phenomena (co… Rock , rock1 / räk/ • n. 1. the solid mineral material forming part of the surface of the earth and other similar planets, exposed on the surface or underly… Iron Ores , Rocks
Rocks are composed of minerals, which are natural inorganic (nonliving) substances with specific chemical compositions and structures. A rock m… Igneous Rocks , Igneous rocks are formed by the cooling and hardening of molten magma. The word igneous comes from the Latin word igneus, meaning fire, and there are… Country Rock , Country rock
The term country rock refers to a body of rock that receives or hosts an intrusion of a viscous geologic material. Intrusions into count… Trachyte , trachyte Fine-grained volcanic rock of the alkaline series of intermediate rocks. Trachyte is the volcanic equivalent of syenite.
trachyte gritty vol…
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discordant age