摘要
采用锆石Ｕ—Ｐｂ稀释法对崂山花岗岩中石英二长岩，黑云二长花岗岩，正长花岗岩及碱性花岗岩４个单元的代表性岩体进行年龄测定。结果表明：其淡黄色透明状锆石的２０６Ｐｂ／２３８Ｕ表面年龄分别为１４６．８±０．８，１２６．２±０．８，１１３．０±０．９和１１０．８±０．９Ｍａ，代表岩石各自的结晶年龄；而正长花岗岩和碱性花岗岩中的红褐色半透明—不透明锆石，因曾遭受严重的晶格破坏和放射性成因铅丢失，表面年龄偏新。
The four zirconic U-Pb isotope ages have been determined for quartz monzonitic granite, biotite monzonitic granite, syenogranite and alkaline granite, which belong to four units from the Laoshan granitoids. The ages of 146.8±0.8,126.2±0.8,113.0±0.9 and 110.8±0.9Ma dated from the light yellow transparent zircon represented the crystallization age of the mother rock, while those ages dated from the red brown semitransparent or untransparent zircon has no chronology significance due to its serious lattice damage and lead loss.
基金
国家自然科学基金
关键词
花岗岩
锆石
铀
铅
年龄测定
Zirconic U-Pb age
granite
Laoshan Mountain
Mesozoic Era
