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甘肃省礼县中川地区属于礼(县)岷(县)金矿带的东段,成矿作用与中川花岗杂岩体有密切的关系。运用高分辨率和高灵敏度离子探针(SHRIMP)测试技术,获得了中川花岗杂岩体形成的精确年龄,主侵入时代为210~160 Ma(可信度95%,MSWD=1.4),该花岗岩体属于燕山早期一印支期造山运动的产物;3颗锆石(4个测点)的SHRIMP测试结果表明,中川地区金成矿的年龄为197~162 Ma,证实礼县中川地区金成矿于中川花岗岩体形成及稍后的时间段。年龄测试和地质剖面测量资料都证实,中川花岗岩体南部地层应该划在中石炭统地层中。与中川花岗杂岩体地质情况类似的碌础坝、柏家庄、间井、教场坝、温泉等岩体外接触带仍然有很大的找矿前景。
The Zhongchuan area in Li County, Gansu Province belongs to the eastern section of the Min (county) gold belt in Li County, and the mineralization is closely related to the Zhongchuan granite complex. Using the high resolution and high sensitivity ion probe (SHRIMP) test technique, the precise age of the Nakuan granite complex was obtained. The main invasion age was 210-160 Ma (95% confidence and MSWD = 1.4) The granite body belongs to the product of one Indosinian orogeny in the early Yanshan. The SHRIMP test results of 3 zircons (4 measuring points) indicate that the gold mineralization age of Zhongchuan area is 197-162 Ma, confirming that the gold mineralization in Zhongchuan area Nakagawa granite body formation and later time period. Both age and geological profile data confirm that the southern Zhongchuan granitoid should be located in the Middle Carboniferous strata. Similar to the geological conditions of the Zhongchuan granite complex, there are still great prospects for prospecting for the external contact zone of the Luba, Baijiazhuang, Jiaojing, Jiaochangba and Hot Springs.