固结成岩
固结成岩-
采用~（40）Ar/~（39）Ar快中子活化定年法，测定沙溪斑岩铜（金）矿成矿年龄为123.6±0.7Ma，成矿岩体从固结成岩到成矿经历了20Ma。
The age of copper mineralization determined by the 40Ar / 39Ar fast-neutron activation technique is 123 . 6 ± 0 . 7 Ma . The process from emplacement and solidification of the mineralizing intrusive to mineralization lasted about 20 Ma .
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未固结成岩地层的特点是孔隙度较高，普遍高于30%，以及砂岩颗粒不存在胶结的情况，另外地震波的频率相对于声波、超声波低得多（小于200Hz）。
Generally , the porosity is higher than 30 % in and grain particles do not cement each other in unconsolidated sentiments . Besides , the frequency of seismic waves is much lower than that of sound waves and ultrasonic wave ( less than 200Hz ) .