摘要
本文是笔者近几年在陕西省洛南县灵口地区开展钼多金属矿找矿评价和研究工作中,利用LA-ICPMS锆石U-Pb法新获得的莲花沟岩体同位素年代学数据的研究成果。其中的闪长岩单元年龄为(137±2)～(158±2)Ma,加权平均年龄为(147.7±2.0)Ma,二长花岗斑岩为(115±2)～(164±3)Ma,加权平均为(144.5±8.9)Ma。两组年龄数据谐和性较好,可代表两个单元岩石或岩体的成岩年龄。由此,提出莲花沟岩体应和金堆城、南泥湖、三道庄等一些大型-超大型钼多金属矿床相关的燕山晚期(160～110Ma)小侵入体为同一构造岩浆旋回作用产物,且提示在东秦岭地区还有发现新的同类型岩体和钼多金属矿床的潜在条件。
Here we dated the Lianhuagou pluton using LA-ICPMS zircon U-Pb method, for molybdenum polymetallic deposit evaluation and prospecting in Luonan county, Shaanxi province in recent years. The age of individual analysis for zircon from the diorite unit ranges from （137 ±2） Ma to （158 ±2） Ma, with a weighted average of （ 147.7 ± 2.0） Ma, whereas that of the monzonitic porphyry ranges from （ 115 ± 2） Ma to （ 164 ± 3） Ma, with a weighted average of （ 144.5 ± 8.9） Ma. These ages are concordant, such that represent the petrogenic age of the two units, respectively. Therefore, we proposed that the Lianhuagou pluton formed at the same tectonic cycle as those late Yanshanian epoch little intrusive rocks related to the large-superlarge molybdenum polymetallic deposits, for example, Jinduicheng, Nannihu, Sandaozhuang and so on, implying of finding new intrusive rocks of the same type and molybdenum polymetallic deposits in the East Qinling mountains.
出处
《地球化学》
CAS
CSCD
北大核心
2010年第1期90-99,共10页
Geochimica
基金
"十一五"国家科技支撑计划重大项目(2006BAB01A01)
国家自然科学基金(40772062)
地质大调查项目(1212010813046)
