- Chondritic uniform reservoir (CHUR) is a scientific model in astrophysics and geochemistry for the mean chemical composition of the part of the Solar Nebula from which, during the formation of the Solar System, chondrites formed.
What is TDM age?
The composition of the depleted reservoir relative to the CHUR evolution line, at time T, is given by the equation. ɛNd(T) = 0.25 T2 – 3 T + 8.5. Sm-Nd model ages calculated using this curve are denoted as TDM ages.
What is epsilon neodymium?
Samarium-147 decays to Neodymium-143 through alpha decay. This Epsilon-Neodymium value varies between -20 and +10 in most rock samples. A negative value indicates continental crust whereas a positive value is represented by MORB or OIB (Reed, et al, 1993). The following figure shows eNd values relative to Sm/Nd values.
Is DanTDM real?
Daniel Robert Middleton, better known by his online name DanTDM, is an English YouTuber and professional gamer. His YouTube channel is listed as one of the top channels in the United Kingdom, with over 17 million subscribers regularly viewing his content.
What is Chur geochemistry?
The CHondritic Uniform Reservoir or CHUR is a scientific model in astrophysics and geochemistry for the mean chemical composition of the part of the Solar Nebula from which, during the formation of the Solar System, chondrites formed.
Is 144sm an isotope?
Samarium 144 Oxide (Samarium-144) is a stable (non-radioactive) isotope of Samarium. It is both naturally occurring and produced by fission.
Does DanTDM have a child?
Asher Middleton DanTDM/Children Personal life. In June 2013, when his channel exceeded 100,000 subscribers, he posted a video revealing his face for the first time. Middleton married his girlfriend, Jemma, on 17 March 2013. Their son, Asher, was born in 2020.
What is bulk silicate Earth?
“Primitive mantle” (PM) and “bulk silicate Earth” (BSE) are synonymous referring to the chemical composition of mantle after core segregation but before the extraction of continental crust. Lithophile elements are those which are not affected by core segregation and stay in the silicate mantle.
What is the half life of samarium 147?
List of isotopesNuclideZHalf-lifeExcitation energy147Sm621.06(2)×1011 y148Sm627(3)×1015 y149Sm62Observationally Stable55 more rows
Does the human body use samarium?
According to researchers, samarium speeds up metabolism. In the human body, the metal is found in the bloodstream, kidneys, and liver. Exposure may cause eye and skin irritation because the salts and compounds are found to be moderately to highly toxic. The metal has been found in some plants and animals as well.
Is crainer Still Alive 2021?
Crainer is 26 years old.
What is the bulk earth?
- Bulk silicate earth (BSE) refers to the original chemical composition of the silicate part of the Earth after the accretion and separation of a core but prior to differentiation of the first crust.