另一种以铁闪锌矿为标志，矿体呈似层状、脉状及不规则状等，靠近岩体接触带或断裂与赋矿层的交汇部位产出，代表了成矿第二世代。
Marmatite is the guide mineral of the second ore type which appears in bedded, veined and irregular ore bodies near contact zone of magmatic rock or joint positions between faults and ore beds.
结果表明，中国梨木虱第一、第二世代种群的趋势指数分别为4．189和3．974； 世代的存活率分别为5．818％和5．52％。
The trend indices of population of 1st and 2nd generations were 4.189 and 3.974, the survival were 5.818% and 5.52%.
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