海南抱板金矿带地质特征及矿床成因

抱板金矿带产于戈枕脆韧性剪切断裂带西侧中元古代花岗岩体内接触带上。有剪切带蚀变岩型、石英脉型和含金伟晶岩型三种主要类型的矿床，以前一类最为重要。经多年研究认为，不同类型矿床的成矿时代不同，具多期成矿的特点。含金伟晶岩型和石英脉型金矿形成于海西期，成矿物质主要来自同期岩浆热液；含金剪切带的糜棱岩型金矿化发生于印支期；剪切带蚀变岩型金矿床形成于燕山期，成矿物质主要来自于与燕山期安玄玢岩同源的深部岩浆，     

江西南部加里东期花岗岩的发现

南岭一带花岗岩出露很广,过去因工作不精细,曾把这一带的未变质的花岗岩认为都属于燕山期花岗岩。笔者等1957年底在江西南部沿汽车路进行路线地质踏勘时,无意中在南康牛颈圩之南鹅公头的公路旁发现南康县龙回花岗岩岩基的南部与泥盆纪峡山砂岩底部成明显的沉积接触。情况如下:该层峡山砂岩     

南岭地区与钨锡矿有关的早阶段花岗岩物质来源及形成条件讨论

南岭燕山早期复式岩体早阶段花岗岩是独立的一期侵入岩体,而不是一个相带。早阶段花岗岩的岩石酸度较低、岩浆分异程度较低。侵位较深。具来源除L部地壳成因物质外,还不同程度地混合有下部地壳或上地幔成因物质。属(?)(?)型和“S”型的过渡类型成因的花岗岩。     

Application of Lead Isotopes to Geochemical Exploration of Gold Deposits in Baoban , Hainan Province, China

Lead isotopes have been widely applied in geochemical exploration and evaluation of ore deposits, as well as in ascertaining the age of mineralization and the source of ore fluids.Long-term practice showed that the method of lead isotope targeting is somewhat efficient for macroscopic evaluation of forecasting areas, but not powerful enough for for ecasting concealed orebodies. As the contents of U and the variation of U/Pb ratio sharply decrease with depth in the lithosphere, U-Th-Pb isotopic differentiation must have occurred during the crust-mantle e-volution. Lead isotopic ratios show a wide variation range, varying in the front of mineralizationand shallow-derived ores, but maintaining very stable in the major orebody and being usuallyclose to the average isotopic composition of the crust and mantle of the continent block fromwhich the ores were derived. Therefore, the lead isotopic composition can serve as a measure for identifying the position of mineralization. The lead isotope geochemistry was applied to the ex-ploration and evaluation of the Baoban gold deposits of Hainan Province, China. The an alyticalresults of ore veins and adjacent rocks showed that there is a correlation between the lead isotopedata and the position of orebody. Based on the experience from the Baoban gold deposits and other ore deposits in Yunnan Province, an exploration principle has been established, that is,positive anomalies of lead isotope eigenvectors for prospecting deep-seated orebodies and nega-tive anomalies of eigenvectors for enlarging lateral exploration surrounding the known deposit.The ore beds in the Erjia and Beiniu mining districts should be as signed to the deep part of the orebody and those in the Tuwaishan mining district should be the shallow part, so ore beds cor-responding to those in the Erjia and Beiniu mining districts may be found in the Tuwaishan min-ing district.     

流体包裹体中轻烃有机气体组成及其对矿床成因的制约:以嵩溪大型银(锑)矿为例

嵩溪银(锑)矿是一个新发现的大型独立银矿。矿物流体包裹体超高真空四极气相质谱系统测定显示,该矿成矿流体中存在多种轻烃有机气体,主要由C_1—C_4饱和烷烃组成,仅含微量C_2—C_4不饱和烯烃和芳烃,说明成矿过程基本未受到高温岩浆作用的影响。化学平衡研究表明,这些轻烃气体为微生物成因和沉积岩围岩中Ⅱ类干酪根热解成因的混合气     

海南抱板地区中元古代花岗岩副矿物锆石的特征及U-Pb同位素年龄测定

海南抱板地区中元古代花岗岩体中各种类型锆石的晶体形态、化学成分、U-Pb同位素组成等特征具有典型的岩浆型锆石的特点,不同于沉积锆石及再生锆石。锆石结晶年龄为1440.87Ma左右,属中元古代。前人所谓的抱板混合岩,主体实质上是中元古代的花岗岩。     

试论有机质在华南花岗岩风化壳REE溶出、迁移和富集中的作用

通过实验研究，论证了花岗岩风化壳中存在有机质，含有丰富的一元脂肪酸和二元脂肪酸，腐殖酸及多糖化合物。ＲＥＥ能以ＲＥ（Ｈ２Ｏ）配位离子从原岩溶出，一些有机介质和无机介质有助于ＲＥＥ从原岩溶出、迁移，其中以脂肪酸溶出量最高。溶出过程配位反应与水解反应同时出现，溶出和在风化壳中保留同时进行，反应受ｐＨ控制。风化壳中ＲＥＥ存在有机结合形态，可能与长链酸或腐殖酸关系比较密切。活性态ＲＥＥ除了与粘土矿物关系密切外，可能与多羟基化合物或多糖有关。     

海南抱板金矿铅同位素化探评价

通过对海南抱板金矿几个切穿矿脉剖面的矿石和围岩的铅同位素组成分析。发现铅同位素组成与矿的产出具有相关关系。铅同位素的异常可能反映了成矿物质来源深度的差异，据此可进行铅同位素化探评价，提出了“正异常以深部找矿为主。负异常注意扩大横向找矿”的原则，土外山地区是地表的浅层金矿化，而二甲，北牛为深源金矿化，在土外山地区深部应可能找到对应于二甲，北牛的深源金矿化层。     

粤西银岩—锡坪地区燕山晚期花岗岩类成岩特征、演化规律及其与锡、钼、钨成矿关系研究

银岩—锡坪地区燕山晚期花岗岩类划分为两个阶段三次侵入。第一阶段有花岗斑岩、石英斑岩两次侵入;第二阶段为中细粒黑云母钾长化岗岩。燕山晚期花岗岩类属板块内部张性构造环境理形成的陆壳改造型花岗岩类,定位浅,其分布明显受北西构造带控制。研究花岗岩特征与锡、钼、钨矿床成矿火系,认为第一阶段花岗斑岩与斑岩型锡钼矿床有关,第二阶段黑云母钾长共花岗岩与云英岩锡钨钼矿化关系密切。     

江西南部前泥盆系的初步认識

一、前言我国华南广大地区,主要是广东、广西、湖南、江西等地,广泛地出露一套前泥盆紀浅变貭岩系,即所謂“龙山系”。解放前,除张席禔在粤西郁南連滩一带,徐瑞麟在粤中新兴、台山一带,以及李四光等在桂北一带采到一些笔石化石以外,在广大的“龙山系”分布地区內一直沒有找到过任何化石。解放后,随着我国地貭普查勘探事业的蓬勃发展,