- 责任者：Lan Tingguang (Key Laboratory of Mineral Resources ; Institute of Geology and Geophysics ; Chinese Academy of Sciences ; Beijing 100029 ; China) ; Fan Hongrui
- 刊名：Acta Petrologica Sinica
- 出版年：2012
- 卷期：28(11)
- 关键词：铁矿 ; iron ores ; 山东 ; Shandong Province
- 页码：p.3595-3611
- 图表：8 illus., 5 tables, 53 refs.
- 分类号：1001
- issnNo：ISSN1000-0569
- isbnNo：CN11-1922/P
///Changyi iron deposit, located at Jiaobei terrane, eastern North China Craton （NCC）, is a banded iron formation （BIF） deposit kept in Paleoproterozoic Fenzishan Group. Ore bodies of the deposit are lens- or layer-like and mainly composed of amphibolite-bearing magnetite quartzite, which have expericed 636 ℃ amphibolite facies metamorphism. LREE depletion, high Y/Ho ratios and positive La and Y anomalies indicate a marine environment. In addition, high Ti/V ratios, high Cr, Co and Ni concentrations as well as positive Eu anomalies suggest involvement of high-temperature hydrothermal fluids, implying ore-forming elements were related to submarine volcanic activities. The lack of negative Ce anomalies also suggests an anoxic environment. Compared with Archean BIFs of NCC, the higher Al2O3, MgO, CaO and K2O contents as well as weaker positive Eu anomalies indicate that the Paleoproterozoic Changyi BIF deposit obtained more clastic or pelitic materials and less hydrothermal fluids in a shallower marine environment.