| 江西华齐铜多金属矿区含矿硅质岩的地球化学特征及成因探讨 |
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| 引用本文： | 周延.江西华齐铜多金属矿区含矿硅质岩的地球化学特征及成因探讨[J].火山地质与矿产,2011(1):57-65. |
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| 作者姓名： | 周延 |
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| 作者单位： | 南京地质矿产研究所,南京210016 |
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| 基金项目： | 中国地质调查局地质调查项目《江西-福建羊角-东留圩地区矿产远景调查》资助 |
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| 摘 要： | 矿产远景地质调查过程中,在江西华齐铜多金属矿区发现含矿硅质岩。测试分析显示,区内硅质岩贫A l2O3、T iO2,Co、C r等元素含量低,贫ΣREE,δ（Eu）为负异常,δ（C e）为弱正异常,HREE相对富集等热水沉积物的特征。在判别硅质岩形成的系列图解上,样品均指示热水沉积作用和大陆边缘环境,这与S iO2/A l2O3、S iO2/（K2O＋N a2O）、S iO2/M gO、M nO/T iO2、K/R b等特征值所指示的结果相一致。本区硅质岩地球化学特征及其对比结果说明该区域构造演化的复杂性。在元古代华南海槽构造演化中在华夏地块边缘发生断裂拉张,形成断陷盆地,并发生了热水喷流沉积成岩成矿作用。本区硅质岩与成矿关系密切,研究硅质岩对于认识区域构造演化及寻找矿化体具有重要意义。
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| 关 键 词： | 硅质岩 地球化学 热水沉积 构造演化 华齐矿区 江西 |
Geochemical characteristics and genesis of ore-bearing siliceous rocks in Huaqi copper-polymetallic mineralized area,Jiangxi Province |
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| ZHOU Yan.Geochemical characteristics and genesis of ore-bearing siliceous rocks in Huaqi copper-polymetallic mineralized area,Jiangxi Province[J].Volcanology & Mineral Resources,2011(1):57-65. |
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| Authors: | ZHOU Yan |
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| Institution: | ZHOU Yan(Nanjing Institute of Geology and Mineral Resources,Nanjing,210016,China) |
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| Abstract: | Ore-bearing siliceous rocks are recently discovered in Huaqi copper-polymetallic mineralized area in Jiangxi province by means of mineral prospective investigation.The siliceous rocks are characterized by low contents of Al2O3,TiO2,Co,Cr and ΣREE,negative Eu anomaly,positive Ce anomaly and enrichment in HREE.The analysis results together with a series of discrimination diagrams imply that the siliceous rocks were formed by hydrothermal sedimentation in the continental margin environment.This conclusion is consistent with the ratios of SiO2/Al2O3,SiO2/（K2O＋Na2O）,SiO2/MgO,MnO/TiO2and K/Rb.The geochemical characteristics of siliceous rocks and their comparison show a complicated regional tectonic evolution of the area.The formation process of copperpolymetallic deposits may be summarized as follows： Fracture and extension occurred at the margin of Cathaysia block during the evolution of Proterozoic trough in South China,which caused to the formation of fault basin and diagenesis and mineralization of hydrothermal exhalative sedimentation.It is regarded that the siliceous rocks in the area have a close relation to mineralization,so the study on characteristics of siliceous rocks is significant to understand regional tectonic evolution and prospect for mineralized bodies in the area. |
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| Keywords: | siliceous rocks geochemistry hydrothermal sedimentation tectonic evolution Huaqi mineralized area Jiangxi province |
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