中文摘要：

通过对中甲锡多金属矿床石英斑岩中锆石的SHRIMPU-Pb测年,获得了（98.5±1.7）Ma（n=29,MSWD=1.8）的年龄值,说明中甲矿区石英斑岩是早白垩世晚期（燕山晚期）区域构造-岩浆活动的产物。通过区域对比后认为,中甲矿区的锡多金属成矿是华南钨、锡多金属成矿省边部燕山晚期成矿作用的组成部分。研究提出,闽西南地区的燕山晚期花岗岩及其外接触带是今后寻找燕山晚期形成的锡多金属矿的找矿方向。

英文摘要：

Mineralizations of the Zhongjia tin-polymetallic deposit in Longyan area of Fujian Province are composed of vein-type ore bodies in the external contact zone and veinlet-disseminated Sn-Wo-mineralization in the inner contact zone, belonging to post-magmatic hydrothermal type related to quartz porphyry of the area. SHRIMP U-Pb dating of twenty zircon grains from the quartz porphyry gived the weighted mean age of （98.5 - 1.7） Ma （n = 29, MSWD = 1.8 ）, suggesting that the quartz porphyry in the deposit was produced by regional tectono-magmatic activities during the late stage of Early Cretaceous. Tin-polymetallic mineralization of the Zhongjia deposit occurred in Late Cretaceous instead of in Early Jurassic and constituted a part of Late Yanshani- an metallogenic activity on the margin of the South China tungsten, tin and polymetallic province, as evidenced by regional metallogenic correlation. The authors hold that the prospecting targets of tin-polymetallic deposits in southwestern Fujian Province should be Late Yanshanian granitic bodies and their external contact zones.