gwd6-24, 25

dongyuntao

我觉得24题的定位应该是这样更准确一点点吧：）

Each of the following is mentioned in the passage as a difference between G10（定位依据） garnet and other versions of garnet EXCEPT

           

A.   level of oxidation (从定位来看不是讨论G10这种东西的地方)

B.    commonness of occurrence (more commonly found versions came from elsewhere in the mantle)

C.   chemical signature (lower in calcium and higher in chrome than garnets from barren pipes)

D.   place of formation (John Gurney showed that garnets with this composition were formed only in the diamond-stability field)

E.    appearance in conjunction with diamonds (G10 garnets, a type of garnet typically found in diamond-rich pipes)