uot;MARGIN: 0cm 0cm 0pt" class=MsoNormal>uot;COLOR: black; FONT-SIZE: 14pt" lang=EN-US>uot;Times New Roman">Huang Danfeng (State Key Laboratory of Geological Processes and Mineral Resources, uot;urn:schemas-microsoft-com:office:smarttags" />untry-region w:st="on">Chinauntry-region> uot;on">University of uot;on">Geosciences, uot;on">Beijing 100083, untry-region w:st="on">uot;on">Chinauntry-region>); Luo Zhaohuauot;urn:schemas-microsoft-com:office:office" />

• 责任者：Zircon SHRIMP U-Pb Age and Tectonic Implications of Jingangtai Volcanic Rocks in North Margin of Dabie Mountains
• 刊名：Earth Science Frontiers
• 出版年：2010
• 卷期：17（1)
• 关键词：SHRIMP定年 ; SHRIMP dating ; 火山岩 ; volcanic rocks ; 铀—铅计时 ; U-Pb dating ; 大别山 ; Dabie Mountains
• 页码：p.1-10
• 图表：4 illus., 1 table, 42 refs.
• 分类号：0801
• issnNo：ISSN1005-2321
• isbnNo：CN11-3370/P

uot;TEXT-INDENT: -123.75pt; MARGIN: 0cm 0cm 0pt 123.75pt; tab-stops: list 123.75pt; mso-list: l0 level2 lfo1" class=MsoNormal>uot;COLOR: black; FONT-SIZE: 14pt" lang=EN-US>uot;Times New Roman">The age of the Jingangtai volcanic rocks, which spread over the central part of uot;urn:schemas-microsoft-com:office:smarttags" />uot;on">North Huaiyang volcanic rock belt, has been in controversy for a long time. New observations indicate that Jingangtai volcanic rocks unconformably overlie the early Cretaceous Shangcheng Pluton, hence they must have not formed in the Jurassic.uot;mso-spacerun: yes">  A SHRIMP U-Pb dating on individual zircons from three representative samples of Jingangtai volcanic rocks shows that the age of extrusive biotite trachyte (B09) is (128.4+3.6) Ma, the age of subvolcanic diorite porphyrite (B21) is (129.1+2.2) Ma and the age of trachyandesite (B26) representing the lower part of volcanic rock series is (129+2) Ma. Combined with the foregoing research works, the regional geological features and the denudation mechanism of Shangcheng Pluton show: that 1) before the forming of Jingangtai volcaruc rocks, the region had undergone intensively compressional uplift; uot;mso-spacerun: yes"> 2) Jingangtai volcanic rocks are the products of lithosphere delamination; and 3) after the forming of Jingangtai volcanic rocks, the regional lithosphere had been extended for a long time, thus 129 Ma is the boundary of tectonic transition for Dabie Orogen.uot;urn:schemas-microsoft-com:office:office" />