Sources and Petrogenesis of the Cenozoic Alkali Basalts in Hebi, Eastern North China Craton: Geochemical and Sr-Nd-Hf Isotopic Evidence
详细信息
- 责任者：Zhu Yusheng (State Key Laboratory of Lithospheric Evolution ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Hou Guangshun
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(12)
- 关键词：碱性玄武岩 ; alkali basalts ; 岩石地球化学 ; lithogeochemistry ; 河南 ; Henan Province
- 页码：p.4064-4076
- 图表：6 illus., 2 tables, 81 refs.
- 分类号：0801
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
摘要
Cenozoic alkali basalts,located in the central North China Craton, are main components of Cenozoic basalt province in the North China Craton. The Hebi basalts are basanites and alkali olivine basalts, belonging to alkaline rocks,with SiO2 contents of 45.0%～47.8%, MgO concentrations of 7.3%～8.5%, and Na2O＋K2O abundances of 4.6%～6.3%. They are enriched in light rare earth elements（REEs） with highly fractionated LREEs and HREEs（（La/Yb）N=15.1～21.2）. It is concluded that the Hebi alkali basalts were derived from small degree partial melting of asthenospheric mantle at depths more than 80 km,with interaction with lithospheric mantle.