Abstract:

Deep carbon cycle is an indispensable part of global carbon cycle. While extensive research has been done on surface carbon cycle, there is still little understanding of the carbon in deep earth. We do not know how much carbon is stored in deep repository, nor do we quantify the migration of carbon between different repositories and its exchange with earths surface. As a simple substance mineral of carbon from deep earth, diamond is a wonderful window of glimpsing deep carbon cycle. Recent rapid development of insitu microanalysis techniques provides strong support for diamond and deep carbon cycle research. This article makes a brief introduction on carbon exchange between surface and deep earth, deep carbon repositories and mineral characteristics of diamond. Subsequently, a discussion is made for mechanism of diamond formation, characteristics and sources of deep earths carboncontaining fluid/melt through stable isotopes compositions of diamond and its inclusion.

Key words:  , diamond, deep carbon cycle, stable isotopes, inclusion