湘南骑田岭竹枧水花岗岩的锆石SHRIMP U—Pb年代学和岩石学

湘南骑田岭竹枧水花岗岩的锆石SHRIMP U—Pb年代学和岩石学

朱金初1, 张辉2, 谢才富1 3, 张佩华1, 杨策1

1. 内生金属矿床成矿机制研究国家重点实验室,南京大学,南京, 210093; 2. 中国科学院,地球化学研究所,贵阳, 550002; 3. 中国地质科学院,宜昌地质矿产研究所,宜昌, 443003

收稿日期:2005-09-20 修回日期:2005-09-20 出版日期:2005-09-20 发布日期:2005-09-20

Zircon SHRIMP U-Pb Geochronology, Petrology and Geochemistry of the Zhujianshui Granite, Qitianling Pluton, Southern Hunan Province

ZHU Jin-chu1, ZHANG Hui2, XIE Cai-fu1 3, ZHANG Pei-hua1, YANG Ce1

1. State Key Laboratory for Mineral Deposits Research, Nanjing University, Nanjin 210093, China; 2. Geochemical Institute, Academia Sinica, Guiyang 550002, China; 3. Yichang Institute of Geology and Mineral Resources, CAGS, Yichang 443003, China

Received:2005-09-20 Revised:2005-09-20 Online:2005-09-20 Published:2005-09-20

摘要/Abstract

摘要： 骑田岭岩体的竹枧水花岗岩是我国南岭地区最早进行同位素年龄测定的花岗岩之一,20世纪60年代初期获得的黑云母K—Ar年龄数据,曾用来作为骑田岭花岗岩属于印支期的主要依据。最近对其进行了锆石SHRIMPU—Pb年龄测定及岩石学和地球化学研究,测得其结晶年龄为160±2Ma,属燕山早期。它富碱富钾,富含LILE和HFSE,具壳幔混合来源,形成于华南大陆内部后造山阶段拉张减薄的构造环境。

Abstract: The Zhujianshui granite of Qitianling pluton is one of the granites whose emplacement age was determined isotopically by biotite K-Ar method during the early 1960＇s. Since then the Qitianling granitic pluton was considered to be Indosinian （Triassic） for many years. This paper studies the zircon SHRIMP U-Pb geochronology, petrology and geochemistry of the Zhujianshui granite, Qitianling pluton. An emplacement age of 160 ± 2 Ma was obtained which indicates an early Yanshanian （Jurassic） magmatic activity. The Zhujianshui granite is enriched in alkalies （ especially in K）, LILE＇s and HFSE＇s, and has a mantle-crustal mixed source. It was formed under a postorogenic extensional environment within the South China continent.

朱金初, 张辉, 谢才富 , 张佩华, 杨策. 湘南骑田岭竹枧水花岗岩的锆石SHRIMP U—Pb年代学和岩石学[J]. J4.

ZHU Jin-chu1, ZHANG Hui2, XIE Cai-fu1 3, ZHANG Pei-hua1, YANG Ce1. Zircon SHRIMP U-Pb Geochronology, Petrology and Geochemistry of the Zhujianshui Granite, Qitianling Pluton, Southern Hunan Province[J]. J4.