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Geological and geochemical characteristics of Early Cretaceous mafic dikes in northern Jiangxi Province, SE China and their geodynamic implications
XIE Guiqing;  HU Ruizhong;  MAO Jingwen;  LI Ruiling;  CAO Jinjian;  JIANG Guohao;  QI Liang
2005
Source PublicationActa Geologica Sinica
Volume79Issue:2Pages:201-210
Abstract

The development of Early Cretaceous mafic dikes in northern and southern Jiangxi allows an understanding
of the geodynamic setting and characteristics of the mantle in southeast China in the Cretaceous. Geological and
geochemical characteristics for the mafic dikes from the Wushan copper deposit and No. 640 uranium deposit are given in
order to constrain the nature of source mantle, genesis and tectonic implications. According to the mineral composition,
the mafic dikes in northern Jiangxi can be divided into spessartite and olive odinite types, which belong to slightly
potassium-rich calc-alkaline lamprophyre characterized by enrichment in large ion lithophile elements (LILE) and light
rare earth elements (LREE), large depletion in high strength field elements (HSFE) and with negative Nb, Ta and Ti
anomalies, as well as 87Sr/86Sr ratios varying from 0.7055 to 0.7095 and 143Nd/144Nd ratios varying from 0.5119 to 0.5122.
All features indicate that the magma responsible for the mafic dikes was derived mainly from metasomatic lithosphere
mantle related to dehydration and/or upper crust melting during subduction. Differences in geochemical characteristics
between the mafic dikes in northern Jiangxi and the Dajishan area, southern Jiangxi were also studied and they are
attributed to differences in regional lithospheric mantle components and/or magma emplacement depth. Combining
geological and geochemical characteristics with regional geological history, we argue that southeast China was dominated
by an extensional tectonic setting in the Early Cretaceous, and the nature of the mantle source area was related to
enrichment induced by asthenosphere upwelling and infiltration of upper crust-derived fluids responding to Pacific Plate
subduction.

Indexed ByEI
Language英语
Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/42920512-1/8126
Collection矿床地球化学国家重点实验室
Affiliation1.Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, Guizhou 550002
2.Institute of Mineral Resources, Chinese Academy of Geological Sciences, Beijing 100037
3.Faculty of Earth Sciences, China University of Geosciences, Beijing 100083
4.Earth Science Department, Sun Yat-Sen University, Guangzhou, Guangdong 510275
Recommended Citation
GB/T 7714
XIE Guiqing;HU Ruizhong;MAO Jingwen;LI Ruiling;CAO Jinjian;JIANG Guohao;QI Liang. Geological and geochemical characteristics of Early Cretaceous mafic dikes in northern Jiangxi Province, SE China and their geodynamic implications[J]. Acta Geologica Sinica,2005,79(2):201-210.
APA XIE Guiqing;HU Ruizhong;MAO Jingwen;LI Ruiling;CAO Jinjian;JIANG Guohao;QI Liang.(2005).Geological and geochemical characteristics of Early Cretaceous mafic dikes in northern Jiangxi Province, SE China and their geodynamic implications.Acta Geologica Sinica,79(2),201-210.
MLA XIE Guiqing;HU Ruizhong;MAO Jingwen;LI Ruiling;CAO Jinjian;JIANG Guohao;QI Liang."Geological and geochemical characteristics of Early Cretaceous mafic dikes in northern Jiangxi Province, SE China and their geodynamic implications".Acta Geologica Sinica 79.2(2005):201-210.
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