Geochemical characteristics and genesis of volcanic and sub-volcanic rocks from porphyrite-type iron deposits in Ningwu metallogenic province, eastern China: Constraints from elements
来源期刊：中南大学学报(英文版)2014年第7期
论文作者：LIU Zhen(刘震) HUANG De-zhi(黄德志) LIU Yu-han(刘毓菡) GU Huang-ling(古黄玲) WANG Long(汪龙) HARTWIG E. Frimmel DAI Ta-gen(戴塔根)
文章页码：2866 - 2876
Key words：rare earth elements; porphyrite-type iron deposit; Ningwu volcanic basin; mantle-derived magma; assimilation fractional crystallization
Abstract: Ningwu porphyrite-type iron deposits are located in Ningwu Mesozoic volcanic basin, which belongs to the middle and lower reaches of the Yangtze River metallogenic province. The volcanic rocks can be divided into Longwangshan, Dawangshan, Gushan and Niangniangshan Formations from early to late. All these volcanic rocks are rich in alkali, and show the similar patterns in rare earth element (REE) distribution. However, some differences can be found in the trace elements and REE patterns. The study of petrology and REE geochemical characteristics shows that these rocks are derived from the underplating of the lithospheric mantle and are contaminated by crustal materials, undergo AFC process during the magmatic evolution.
LIU Zhen(刘震)1, 2, HUANG De-zhi(黄德志)1, LIU Yu-han(刘毓菡)1, GU Huang-ling(古黄玲)1, WANG Long(汪龙)1, HARTWIG E. Frimmel2, DAI Ta-gen(戴塔根)1
(1. School of Geosciences and Info-Physics, Central South University, Changsha 410083, China;
2. Geodynamics and Geomaterials Research Division, Institute of Geography and Geology,
University of Würzburg, Am Hubland D-97074 Würzburg, Germany)
Abstract:Ningwu porphyrite-type iron deposits are located in Ningwu Mesozoic volcanic basin, which belongs to the middle and lower reaches of the Yangtze River metallogenic province. The volcanic rocks can be divided into Longwangshan, Dawangshan, Gushan and Niangniangshan Formations from early to late. All these volcanic rocks are rich in alkali, and show the similar patterns in rare earth element (REE) distribution. However, some differences can be found in the trace elements and REE patterns. The study of petrology and REE geochemical characteristics shows that these rocks are derived from the underplating of the lithospheric mantle and are contaminated by crustal materials, undergo AFC process during the magmatic evolution.
Key words:rare earth elements; porphyrite-type iron deposit; Ningwu volcanic basin; mantle-derived magma; assimilation fractional crystallization
