海洋地质与第四纪地质2006，Vol.26Issue(3)：75-86,12.
东海陆架新生代砂岩锆石U-P年龄及其地球动力学意义
U-P DATING OF ZIRCONS FROM CENOZOIC SANDSTONE: CONSTRAIN ON THE GEODYNAMIC SETTING OF EAST CHINA SEA SHELF BASIN
摘要
Abstract
The U-P dating data of zircon from Paleocene sandstones in the west of East China Sea shelf indicate that most zircon grains are of Mesozoic origin, and then are Proterozoic, including sporadic Paleozoic ones. The U-P dating data of zircons from Oligocene sandstones in the east of East China Sea shelf indicate that most zircon grains are Proterozoic, and then are Mesozoic, including sporadic Archean and Paleozoic ones. The dating result indicates that the basement is different between the west and the east of East China Sea shelf basin. The western basement is consistent with the outcrop data in Fujian-Zhejiang offshore area. The U-P dating data of zircons imply that topography was low in the west and high in the east of East China Sea shelf during the development of Eogene basin. Chondritenormalized REE patterns of the individual zircons determined by ICPMS show that the Proterozoic zircons have high content of LREE and invisible Ce anomalies, whereas Mesozoic zircons have large positive Ce and small negative Eu anomalies, and Paleozoic zircons are characterized by low content of LREE in which La is higher in content than other LREE elements. The LAM-ICPMS data give chronological evidence to us to previously identify basement rocks and to probe into tectonic property of the shelf of East China Sea.关键词
锆石/新生代砂岩/U-P年龄/REE/基底/东海陆架Key words
sandstone/U-P dating/REE/basement/zircon/East China Sea shelf分类
海洋科学引用本文复制引用
杨香华,李安春,秦蕴珊,吴时国,吴志轩,张建培..东海陆架新生代砂岩锆石U-P年龄及其地球动力学意义[J].海洋地质与第四纪地质,2006,26(3):75-86,12.基金项目
Financed by National Basic Research Project(G200046703). （G200046703）
