华东地质2016，Vol.37Issue(3)：174-181,8.DOI:10.16788/j.hddz.32-1865/P.2016.03.003
西秦岭白马山“C”型埃达克岩成因：地球化学、Sr-Nd-Pb同位素制约
Petrogenesis of the Baimashan C-type adakite in Western Qinling：Constraints from their geochemistry and Sr-Nd-Pb isotopic compositions
摘要
Abstract
The Baimashan small rock body ,related to gold deposit in space ,is located in the Baimashan gold mining field ,western Qinling metallogenic belt .This study conducted geochemical characteristics a‐nalysis of main elements ,trace elements and rare earth elements ,and Sr‐Nd‐Pd isotopic composition so as to understand its petrogensis .The results indicate that these rocks belong to high K calc‐alkalic series and have geochemical compositions similar to the C‐type adakite .Sr‐Nd‐Pb isotopic compositions show that the rock body is characterized by enrichment of radiogenic Pb ,with initial ( 87 Sr/86 Sr)t of 0 .706 ,negativeεNd(t) of ‐6 .75 ,and T DM of 1 .53Ga ,implying that the magmas should derive from lower continental crust and geochemically similar to the mafic rocks of the Yaolinghe Group .It can be concluded that the rock might result from partial melting of thickened mafic lower crust ,with residual phase being amphibole eclo‐gite .关键词
地球化学/Sr/Nd/Pb同位素组成/“C”型埃达克岩/岩石成因/西秦岭Key words
geochemistry/Sr-Nd-Pb isotopic compositions/C-type adakite/petrogenesis/Western Qinling分类
天文与地球科学引用本文复制引用
王建中,钱壮志,徐刚,姜超..西秦岭白马山“C”型埃达克岩成因：地球化学、Sr-Nd-Pb同位素制约[J].华东地质,2016,37(3):174-181,8.基金项目
国家自然科学基金“新疆喀拉通克铜镍硫化物矿床成矿作用与深部地质过程”（项目编号41372101）。 （）
