中文摘要：

由岩屑形成的锆石谷物近来，新生代沉积始于 ca。从在 Yangtze 三角洲的核心 DY03 的 3.6 妈被 LA-ICP-MS 与约会，以便调查沉积起源并且为长江的进化发现某线索。大多数由岩屑形成的锆石 U-Pb 年龄在 100300 妈， 350550 妈， 6001000 妈， 14002000 妈和 22002800 妈被散布，它与相应很好主要构造并且在 Yangtze 排水的 magmatic 事件。由岩屑形成的锆石年龄模式在 189.8 m 和其它下面显示出 3 件样品之间的不同差别 6 在 189.8 m 上面。当从 150 ～ 2800 妈的年龄没有明显的山峰是分布式的时，在在 189.8 m 下面的 3 件样品的 43%55% 锆石在白垩纪以内掉落，它显示沉积起源可能限于更低的 Yangtze 排水。在 189.8 m 上面的 6 件样品证明类似的年龄模式，和年龄均匀地相对被散布，显示清楚地拓宽的沉积起源。比 ca 晚扔的所有 6 件样品。从上面的 Yangtze 排水的 3.2 妈表演年龄信息(包括 Emeishan 大火的省) ，显示三塞满可能已经通过那时被切了。

英文摘要：

Detrital zircon grains of Late Cenozoic sediments dated back to ca.3.6 Ma from core DY03 in the Yangtze delta were dated by LA-ICP-MS,in order to investigate the sedimentary provenance and to find some clue for the evolution of the Yangtze River.Most of the detrital zircon U-Pb ages are distributed at 100 300 Ma,350 550 Ma,600 1000 Ma,1400 2000 Ma and 2200 2800 Ma,which correspond well with the main tectonic and magmatic events in the Yangtze drainage.The detrital zircon age patterns show distinct difference between the 3 samples below 189.8 m and other 6 above 189.8 m.43% 55% zircons in the 3 samples below 189.8 m fall within Cretaceous,while ages from 150 to 2800 Ma are distributed with no obvious peaks,which indicate the sedimentary provenance may be limited to the lower Yangtze drainage.The 6 samples above 189.8 m show similar age patterns,and the ages are relatively evenly distributed,indicating the sedimentary provenance broadened distinctly.All 6 samples deposited later than ca.3.2 Ma show age information from the upper Yangtze drainage （including the Emeishan large igneous province）,indicating that the Three Gorges may have already been cut through by then.