Which best describes the process of carbon 14 dating
Embedded in this dust are presolar grains, which predate the formation of our solar system and originated elsewhere in the galaxy.The chondrules have distinct texture, composition and mineralogy and their origin continues to be the object of some debate.They are divided into three groups, which have different amounts of metal and different amounts of total iron: Another of their main characteristics is the presence of water or of minerals that have been altered by the presence of water.There are many groups of carbonaceous chondrites, but most of them are distinguished chemically by enrichments in refractory lithophile elements relative to Si and isotopically by unusually low They are characterized by large amounts of dusty matrix and oxygen isotope compositions similar to carbonaceous chondrites, highly reduced mineral compositions and high metal abundances (6% to 10% by volume) that are most like enstatite chondrites, and concentrations of refractory lithophile elements that are most like ordinary chondrites.
Their chondrules are generally in the range of 0.5 to 1 mm in diameter.
Numbers lower than 3 are given to chondrites whose chondrules have been changed by the presence of water, down to 1, where the chondrules have been obliterated by this alteration.
A synthesis of the various classification schemes is provided in the table below.
Chondrites were formed by the accretion of particles of dust and grit present in the primitive Solar System which gave rise to asteroids over 4.55 billion years ago.
These asteroid parent bodies of chondrites are (or were) small to medium-sized asteroids that were never part of any body large enough to undergo melting and planetary differentiation. Another indication of their age is the fact that the abundance of non-volatile elements in chondrites is similar to that found in the atmosphere of the Sun and other stars in our galaxy.