粤北中泥盆世含金岩石地球化学标志及其沉积环境  

GEOCHEMICAL INDICATIONS AND SEDIMENTARY ENVIRONMENT OF MIDDLE DEVONIAN GOLD-BEARING ROCKS IN NORTHERN GUANGDONG

作　　者：汤珂 韦秋妮 吴海陆 丘岸鹏 TANG Ke;WEIQiu-ni;WU Hai-lu;QIU An-peng(GuangdongInstitute of Geological Survey,Guangzhou 510110)

机构地区：[1]广东省地质调查院,广东广州510110

出　　处：《云南地质》2024年第3期370-378,共9页Yunnan Geology

基　　金：广东省地质勘查基金项目,项目名称:《广东曲江大宝山-英德金门含金层位研究》,任务书编号:粤地[2018]04。

摘　　要：粤北中泥盆统老虎头组地球化学指标反映了陆相和海相的地球化学特征,Sr、La含量由陆相至海相逐步增高。沉积环境酸碱度(PH值)的地球化学指标反映沉积水成岩水酸碱度的突然变化,是Au沉淀重要的控制因素,铈异常是氧化-还原沉积环境的重要指标,地球物理障泥质岩石层,其下部层位是Au及其他元素的富集部位。早-中泥盆世杨溪组是陆相洪积、冲洪积层;中泥盆世老虎头组第一段是陆相冲积层,老虎头组第二段是中泥盆世大规模海进初始阶段,中泥盆世棋梓桥组(D_(2)q)属海相地层。The geochemical indicators of the Middle Devonian Laohutou Formation in northern Guangdong reflect the geochemical characteristics of both terrestrial and marine facies,with an increasein Sr and La contents from continental to marine facies.The geochemical index of pH value of the sedimentary environment reflects the sudden changes in pH of sedimentary water and diagenetic water,which is an important controlling factor of Au precipitation.Cerium anomaly is an important indicator of oxidation-reduction sedimentary environment.The lower layer of geophysical barrier mudstone is the enrichment site of Au and other elements.The Early-Middle Devonian Yangxi Formation was a continental alluvial and fluvial layer.The first section of theMiddle DevonianLaohutou Formation was acontinentalalluvial layer,whilethe second section of which was the initial stage of large-scale marine transgression in the Middle Devonian.The Middle Devonian Qiziqiao Formation(D)2q was marine strata.

关 键 词：含金岩石 中泥盆世 地球化学标志 沉积环境 粤北 广东 

分 类 号：P595[天文地球—地球化学] P618.51[天文地球—地质学]