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矿物中杂质元素的成份随深度加大而发生有规律的变化.在这种情况下,矿物中某些元素的比值就可以作为典型的指示比值用以判定矿体的剥蚀水准.例如,深度增加即温度增高时,锡石中In的含量减少,而Nb的含量增高,所以In与Nb的比值可以判断矿体的剥蚀水准.有些多金属矿床,方铅矿中Sb的含量随深度增加而减少,Bi则增多,所以Sb∶Bi是一个指示比值;有些地区Ag∶Au也可以作指示比值.Rb∶Ba是所有含钾长石矿床的一个指示比值;而对于稀有元素花岗岩的黑云母则可采用Li∶Sc.如果深度增加,矿物中不是一个而是
The composition of impurity elements in minerals changes regularly with depth, in which case the ratio of some elements in minerals can be used as a typical indicator to determine the denudation level of ore bodies, for example, the depth increases That is, when the temperature is increased, the content of In in cassiterite decreases and the content of Nb increases, so the ratio of In and Nb can determine the denudation level of the orebody.In some polymetallic deposits, the content of Sb in galena decreases with the increase of depth , Bi increases, so Sb: Bi is an indicator ratio, Ag: Au can also be used as an indicator in some areas, Rb: Ba is an indicator ratio for all K-bearing feldspar deposits, and biotite for rare element granites With Li: Sc. If the depth increases, the mineral is not one but