地质与勘探2011，Vol.47Issue(6)：967-981,15.
皖南燕山期高钾钙碱性埃达克岩厘定及岩石成因
Geochemical Characteristics and Petrogenesis of High-K Calc-alkaline Adakite of the Yanshanian Epoch in South Anhui
摘要
Abstract
The acidic magmatic rocks of late Jurassic-early Cretaceous in South Anhui are indigenous to the eastern part of Jiangnan paleouplift in the Yangtze landmass, of which the primary, rock type is calc-alkaline granodiorite with the major mineral assemblage being plagioclase＋quartz＋potassium feldspar＋amphibole_＋biotit and some accessory minerals being apatite, zircon, titanite, magnetite, and ilmenite. The magmatic rocks belong to ealc-alkaline series with geochemical characteristics of higher SIO2（66.81% ）, Al203 （ 15.23% ）, K20/Na20 （ 1.01 ） and lower TiO2（0.49% ）, MgO （ 1.49% ）, CaO （3.18%） , and P2O5 （0.18% ）. They are also obviously rich in LREE and LILE （Rb, La, Ba, Sr） , and depleted in HREE and HSFE （Nb, Ta, Zr, Y） with slightly negative 8Eu （0.8）, higher Sr/Y（ 39.05 ） and La/Yb （24.34）, lower Y （ 13.99×10^-6 ） and Yb （ 1.4 ×10^-6 ）, and meanwhile ISr = 0. 7092, eNd 〈 0. The analysis of petrological and geochemical characteristics suggests that the magmatic rocks of late Jurassic-early Cretaceous in South Anhui are ＂C＂ type, high-K calc-alkaline adakite （HKCAA） , which were formed from partial melting of the thickened lower crust by delamination in Mesozoic in eastern China.关键词
埃达克岩/地球化学特征/构造环境/岩石成因/燕山期/皖南Key words
Adakite/geochemical characteristic/structural environment/petrogenesis/Yanshanian/south Anhui分类
天文与地球科学引用本文复制引用
翁望飞,曹诚,支利赓,蔡连友,徐生发,王邦民..皖南燕山期高钾钙碱性埃达克岩厘定及岩石成因[J].地质与勘探,2011,47(6):967-981,15.基金项目
安徽省国土资源厅公益性地质调查基金项目《闪里幅（H50E013014）15万区域地质矿产调查》（项目编号：2010-g-11）资助. （）
