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与豫西小秦岭和熊耳山地区相类似,崤山北部也出露一系列中酸性小岩体,但与之相关的成矿作用明显较弱,因此长期未获得应有的关注。崤山北部小岩体的形成时代与区域成岩成矿时代之间的匹配关系对其深部构造演化研究及成矿潜力评价具有重要意义,鉴于此,作者对后河岩体进行了LA-ICP-MS锆石U-Pb定年。后河岩体定年样品HH01的岩性为中-细粒黑云母二长花岗岩,30个锆石测点中有27个测点的测定值位于207Pb/235U-206Pb/238U一致线上,相应的206Pb/238U年龄介于124~134 Ma之间,加权平均年龄为128±1Ma(MSWD=1.02),属早白垩世。后河岩体是岩石圈拆沉作用的产物,其形成时代处在东秦岭地区广泛而强烈的成岩成矿作用时限内,且显示了Au、Ag、Cu、Mo、W等元素的异常富集,具有较大的内生金属成矿潜力。
Similar to the small Qinling and Xiong’ershan areas in western Henan, a series of medium-acidic small rock bodies are also exposed in the northern part of the Jushan Mountain, but the related mineralization is obviously weaker, therefore, they have not received due attention for a long time. The matching relationship between the formation time of small rock masses and the regional diagenetic metallogenic age in the north of the Jushan Mountain is of great significance for the study of its deep tectonic evolution and evaluation of metallogenic potential. In view of this, MS zircon U-Pb dating. The lithology of the Houhe pluton dating sample HH01 is medium-fine biotite monzogranite. The measured values of 27 of 30 zircon sites are located at the 207Pb / 235U-206Pb / 238U coincidence line, and the corresponding 206Pb / 238U ranged in age from 124 to 134 Ma with a weighted average age of 128 ± 1 Ma (MSWD = 1.02), belonging to the Early Cretaceous. Houhe pluton is the product of lithosphere delamination. The formation time is within the time limit of extensive and intense diagenesis and mineralization in the East Qinling area, and shows the abnormal enrichment of Au, Ag, Cu, Mo, W and other elements , With greater potential for endogenic metallogenesis.