地质学报2017，Vol.91Issue(7)：1483-1505,23.
长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究
Geochronolgy and Petrological Geochemistry of Intrusions in the Lujiang-Zongyang Basin in the Mineralization Belt of the Middle and Lower Reaches of Yangtze River Revealed by Scientific Drilling
摘要
Abstract
Scientific Drilling No.1 in the Lujiang-Zongyang basin is the pilot hole of Chinese Continental Scientific Drilling.The drilling with an end depth of 3008.29 m successfully reveals the internal geological structure of the Luzhong basin.This study carried out a systematic study of geochronology,petrology and geochemistry on the concealed intrusions in LZSD-01.LA-ICPMS zircon U-Pb dating yields the ages of 132.6±1.2 Ma and 133.28 ±0.4 Ma respectively for concealed syenite and monzonite,suggesting that they were the product of magmatic intrusion at the end of Zhuanqiao volcanic cyclic in this basin.Magmatic rocks are characterized by nearly saturated SiO2,high contents of Al2O3 and K2O,and low TiO2.The concealed intrusions of LZSD-01 also have relatively high LILEs such as Rb,K,Pb,but depleted HSFEs such as Nb,Ta and Ti,indicating that the intrusion should be shoshonitic rock.The Sr-Nd isotopic composition suggests that the primary magma of the concealed intrusions in the Qianpu area may derive from enriched mantel type-Ⅰ.Elemental evolution trend shows that fractional crystallization of major minerals such as plagioclase,pyroxene and ilmenite may be the leading mechanism and concealed intrusions likely formed in the tectonic setting of intraplate extension.关键词
庐枞火山岩盆地/科学钻/SinoProbe/钱铺地区/隐伏岩体Key words
Lujiang-Zongyang volcanic basin/scientific drilling/SinoProbe/Qianpu area/concealed intrusion引用本文复制引用
张舒,周涛发,吴明安,张赞赞,薛怀民,李小东..长江中下游成矿带庐枞盆地科学深钻中侵入岩年代学及地球化学研究[J].地质学报,2017,91(7):1483-1505,23.基金项目
本文为国家自然科学基金项目(编号41320104003)、中国地质调查局地质调查工作项目(编号12120114038001、1212011120862、12120114039701)、深部探测与实验研究专项(编号SinoProbe-05-05)、安徽省公益性地质调查项目(编号2016-g-2-16)共同资助的成果. （编号41320104003）
