Geochemistry of the Heishan V-Ti-Bearing Magnetite Deposit in the Damiao Rocks of Chengde, Hebei Province
详细信息
- 责任者：Jiang Shaoqing (State Key Laboatory Geological Processes and Mineral Reasources ; China University of Geosciences ; Beijing 100083 ; China) ; Hao Ziguo
- 刊名：Geology and Prospecting
- 出版年：2013
- 卷期：49(3)
- 关键词：钒钛磁铁矿矿床 ; vanadium titano-magnetite deposit ; 河北 ; Hebei Province
- 页码：p.458-468
- 图表：illus., 2 tables, 25 refs.
- 分类号：1001
- issnNo：ISSN0495-5331
- isbnNo：CN11-2043/P
摘要
The Heshan magnetite deposit is located in the southern margin of the Damiao plagioclase intrusions, which are comprised of four plagioclase and norite rock bodies: the Heishan, Maying, Luoguozigou and Dawusugou intrusions. The V-Ti-bearing magnetite ores mainly occur in the Heishan norite intrusion. Geochemical studies show that the Mg# values for different rock types follow in a sequence of ultramafic rocks >norite>plagioclase>magnetite ore rocks. This may suggest that the magma-intruding age of mafic rocks is later than the ultramafic rocks. The δEu values for the plagioclase and norite intrusions show weak positive anomalies, suggesting the original magmas are alkaline basalts. LREE and LILE are enriched; the Ce/Pb ratio is higher than the mean value of crust; the primitive magma show characters of a mantle source, and the Damiao plagioclase intrusions occur in an extensional intraplate environment. The chemical properties of norite is closely associated with the formation of this deposit. The Heishan and Dawusugou intrusions have the same characters, in which the norite is mafic-altramafic and alkali-rich, forming the iron, phosphorus, vanadium, and titanium deposits. In the Luoguozigou intrusion, the norite is Fe-and Ti-rich, and alkali-depleted, forming poor ores of iron, phosphorus, vanadium, and titanium, or only mineralization. And in the Maying intrusion, the norite rock is alumina-rich and alkali-depleted with weak mineralization.