[1]蔡 杨,吴维平,马 涛,等.安徽九华山柯村花岗斑岩锆石U-Pb年代学、地球化学特征及地质意义[J].华东地质,2018,39(03):177-186.[doi:10.16788/j.hddz.32-1865/P.2018.03.003]
 CAI Yang,WU Wei-ping,MA Tao,et al.Chronology and geochemistry of the Kecun granite porphyry in the Jiuhuashan area, Anhui Province and their geological implications[J].East China Geology,2018,39(03):177-186.[doi:10.16788/j.hddz.32-1865/P.2018.03.003]
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安徽九华山柯村花岗斑岩锆石U-Pb年代学、地球化学特征及地质意义()
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《华东地质》[ISSN:2096-1871/CN:32-1865/P]

卷:
39
期数:
2018年03期
页码:
177-186
栏目:
基础地质
出版日期:
2018-09-15

文章信息/Info

Title:
Chronology and geochemistry of the Kecun granite porphyry in the Jiuhuashan area, Anhui Province and their geological implications
文章编号:
2096-1871(2018)03-177-10
作者:
蔡 杨12吴维平12马 涛12董婷婷12林启刚3章寅虎3
(1. 安徽省地质调查院,合肥 230001; 2. 安徽省地质科学研究所,合肥 230001; 3. 九华山国家地质公园,池州 242811)
Author(s):
CAI Yang12 WU Wei-ping12 MA Tao12 DONG Ting-ting12 LIN Qi-gang3 ZHANG Yin-hu3
(1. Geological Survey of Anhui Province, Hefei 230001, China; 2. Anhui Institute of Geology, Hefei 230001, China; 3. Jiuhuashan National Geopark, Chizhou 242800, China)
关键词:
锆石U-Pb定年 地球化学 构造环境 柯村花岗斑岩 安徽省
Keywords:
Zircon U-Pb dating geochemistry tectonic setting Kecun granite porphyry Anhui Province
分类号:
P588.12
DOI:
10.16788/j.hddz.32-1865/P.2018.03.003
文献标志码:
A
摘要:
柯村花岗斑岩位于九华山国家地质公园西部,九华山岩体西侧。LA-ICP-MS 锆石U-Pb年代学研究表明:该花岗斑岩的侵入时间为125.8±0.9 Ma,与九华山岩体的侵入时间相近,属于早白垩世岩浆活动的产物; 九华山柯村花岗斑岩富硅、富碱、富集不相容元素,亏损Sr、Ba、Ti等元素,具有较高的10 000×Ga/Al值和锆石饱和温度,地球化学特征与A型花岗岩相似,形成于伸展构造环境,表明在125 Ma左右,皖南地区已经由早期相对挤压的构造环境转变为伸展构造环境。
Abstract:
Kecun granite porphyry is located in the western part of Jiuhuashan National Geopark and in the west side of Jiuhuashan granite. Study of LA-ICP-MS zircon U-Pb dating indicates that granite porphyry emplaced at 125.8±0.9 Ma, close to the intrusion age of Jiuhuashan granite, suggesting that it should be the product of early Cretaceous magmatic activity. The Kecun granite porphyry is enriched in SiO2, total alkalis and incompatible elements, depleted in Ba, Sr and Ti, and has high 10 000×Ga/Al values and zircon saturation temperature. All of these features are similar to geochemical characteristics of A-type granite, indicating that the Kecun granite porphyry was formed in an extensional tectonic setting. This study can conclude that the tectonic environment of southern Anhui Province might have transformed from early compression to extensional tectonic settings at ca. 125 Ma.

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备注/Memo

备注/Memo:
*收稿日期:2017-09-15 修订日期:2017-12-01 责任编辑:谭桂丽
基金项目:九华山国家地质公园科技项目(2013)资助。
第一作者简介:蔡杨,1986年生,男,工程师,主要从事岩石学、矿床地球化学及地质遗迹调查研究。
更新日期/Last Update: 2018-09-26