Yu例句以下例句来源于网络,仅供参考1.变质岩SHRIMP锆英石U-Pb年龄十分复杂,除有少量太古宇形成的锆英石外,还存在大量元古宇至显生宇的锆英石,并在2000Ma,1200Ma,800Ma,400Ma,200Ma左右形成峰期。The SHRIMP zircon U-Pb ages are very complex; except for small amount of Archean zircon, there are also significant amounts of Proterozoic to Phanerozoic zircon. The metamorphic peaks occurred at-1 200, 800, 400 and 200 Ma.