CAJ | 학술논문

豫西熊耳山内121个内生金属矿床(点)分布于经线112°E 以西,而其内经线112°E 以东尚未发现内生金属矿化,它是否为熊耳山内生金属成矿作用的界线对该地区的找矿思路转变具有重要意义。笔者对熊耳山地区经线112°E 以东出露面积最大的斑竹寺花岗斑岩岩体进行了 LA-ICP-MS 锆石 U-Pb 定年,样品 BZS01的29个锆石测点的测定值均位于207 Pb/235 U-206 Pb/238 U 一致线上,其206 Pb/238 U 年龄为124~138 Ma,28个测点的加权平均206 Pb/238 U 年龄为129±1 Ma(MSWD=1.7),属于早白垩世。斑竹寺岩体是岩石圈拆沉作用的产物,其形成时代位于东秦岭地区广泛而强烈的成岩成矿作用时限内,且斑竹寺岩体显示了 Au、Ag、Pb、Zn 等成矿元素的异常富集,这表明熊耳山内经线112°E 以东的斑竹寺岩体具有成矿潜力。
예서웅이산내121개내생금속광상(점)분포우경선112°E 이서,이기내경선112°E 이동상미발현내생금속광화,타시부위웅이산내생금속성광작용적계선대해지구적조광사로전변구유중요의의。필자대웅이산지구경선112°E 이동출로면적최대적반죽사화강반암암체진행료 LA-ICP-MS 고석 U-Pb 정년,양품 BZS01적29개고석측점적측정치균위우207 Pb/235 U-206 Pb/238 U 일치선상,기206 Pb/238 U 년령위124~138 Ma,28개측점적가권평균206 Pb/238 U 년령위129±1 Ma(MSWD=1.7),속우조백성세。반죽사암체시암석권탁침작용적산물,기형성시대위우동진령지구엄범이강렬적성암성광작용시한내,차반죽사암체현시료 Au、Ag、Pb、Zn 등성광원소적이상부집,저표명웅이산내경선112°E 이동적반죽사암체구유성광잠력。
There are 121 endogenetic metal deposits and mineralizaion spots found in Xiongershan of western Henan province,which are distributed in the west of 1 12°E.On the east side of this longitude,however,no endogenetic metal mineralization has been found until now.So the longitude may have a great significance to the ore prospecting direction in this area.LA-ICP-MS zircon U-Pb dating is conducted on Banzhusi granitic porphyry,whose outcrop proportion takes up most of the area eastern of longitude 1 12.Values of 29 zircon measuring points from sample BZS01 are analyzed in total,and all of them are in concordance in the 207 Pb/23 5 U-206 Pb/238 U diagram,whose 206 Pb/238 U ages change between 124Ma and 138 Ma.The weighted average age of 28 analyzed spots is 129 ± 1 Ma,suggesting that the ore body was formed in early Cretaceous. The research also indicates that Banzhusi rock mass is the product of lithosphere delamination, and its age falls into the time interval of extensive and intensive endogenetic mineralization in east Qinling orogenic belt.Samples from Banzhusi ore body have displayed abnormal enrichment in Au,Ag, Pb and Zn, from which it can be considered that Banzhusi ore body possesses endogenetic mineralization potential.