为了探讨花岗岩的萤石成矿专属性特征,在系统搜集前人成果基础上,对南岭东段北部产萤石花岗岩和非产萤石花岗岩开展了元素地球化学测试和黑云母电子探针分析(EPMA)与对比。结果表明:产萤石花岗岩主要为黑云母花岗岩,属于高钾钙碱性系列,副矿物组合中常见萤石;加里东期、印支期和燕山期的花岗岩均具有形成萤石矿床的可能性,以燕山早期花岗岩的潜力最大。与非产萤石花岗岩相比,产萤石花岗岩具较高的Mo含量和较低的Th/U比值;其黑云母主要为铁质黑云母和铁叶云母,比非产萤石花岗岩的黑云母(主要为铁白云母和铁叶云母)更富TiO2、MgO、Cl、F而贫Al2O3、FeO+Fe2O3;黑云母的F与Cl含量呈正相关,而与Al2O3含量呈负相关;产萤石花岗岩形成于相对高温、低压和高氧逸度的环境,岩浆来源主要为地壳,但有少量幔源,与钨多金属矿床关系较为密切。

Fluorite deposits in the northern part of the eastern Nanling region are intimately associated with granitic intrusions. To investigate their fluorite-metallogenetic specialization, the chemical compositions of biotites and whole rock of the granites were analyzed. The granites are divided into two groups: fluorite-bearing and fluorite-barren granites. The fluorite-bearing granites are mainly biotite granites, high potassium calc-alkaline, whose accessory minerals commonly include fluorite. The fluorite-bearing granites have higher Mo contents and lower Th/U ratios than those of the fluorite-barren counterparts. Biotite in the fluorite-bearing granites is ferruginous biotite and siderophyllite biotite, which are characterized by higher contents of TiO2, MgO, Cl, and F and lower contents of Al2O3, TFe2O3 than those of the fluorite-barren granites. F and Cl contents of the fluorite-bearing granites show an obvious positive correlation, while the F and Al2O3 contents negatively correlated

广西波塘地区的稀土矿为我国南方花岗岩风化壳离子吸附型稀土矿床,成矿母岩为华力西期,印支期的黑云母花岗岩岩类,原岩稀土含量211×10^-6-354×10^-6.笔者主要介绍了波塘矿床的基本特征、稀土元素配分,认为有利的成矿母岩是稀土含量〉200×10^-6的黑云母花岗岩类.广泛分布的黑云母花岗岩类,有利于风化壳形成保留的温暖潮湿气候条件,丘陵浅山的地理环境是华南花岗岩风化壳离子吸附型稀土矿成矿的主要条件.

REE deposits in Botang area of Cenxi are ion-adsorption type REE deposits in weathered crust of granite in South China,and the mother rock is Variscan-Indosinian biotite granite rocks,with rare earth con-tent in protolith of 21 1×10 -6 ~354×10 -6 .This paper introduced the basic characteristics and REE assemblage of Botang deposits,and it believed that the favorable mother rock is biotite granite rocks with REE content of above 200ppm.The widely distributed biotite creates a favorable warm and humid climate condition for the forming of weathered crust,and the environment of shallow hills is the prevailing condition of ore-form-ing of ion-adsorption type REE deposits in weathered crust of granite in South China.

东昆仑得尔龙地区花岗岩体侵位于二叠纪—三叠纪早期,岩石类型为黑云母花岗闪长岩、黑云母二长花岗岩、二云母二长花岗岩。早期次的黑云母花岗闪长岩中含有暗色的镁铁质矿物包体。SiO2含量为65.04%~73.47%,全碱含量为5.29%~8.52%,K2O/Na2O平均值为0.70,Al2O3平均为14.79%;亏损高场强元素Ta,Nb;∑REE平均为142.9×10-6,轻稀土元素相对富集,(La/Yb)N平均为17.15,δEu平均为0.71,表现为弱亏损。研究表明得尔龙地区花岗岩属次铝-过铝(高钾)钙碱性S型花岗岩,形成于后造山环境;岩浆源区的物质是多源的,主要为地壳物质的重熔,其次为幔源岩浆的底侵。

The emplacement of Deerlong granite in east of Kunlun mountains intruded in Permian period to the early Triassic period.The types of granite include biotite granodiorite,biotite monzonitic granite and two mica monzonitic granite.There are mafic xenoliths in biotite granodiorite of the early period time.As showed by geochemical analyses:the content of SiO2 is 65.04%~73.47%,the content of total alkali is 5.29%~8.52%,average value of K2 O/Na2 O is 0.70,and average content of Al2 O3 is14.79%.The Deer-long granite has a lower content of HFSE such as Nb and Ta,and a normal total REE concentration (142.9g/g).Chondrite normalized REE patterns show a remarkable enrichment in LREE (La/Yb)N =17.15.Eu values (0.71 )indicates that the primitive magma was basic and enriched in plagioclase most likely.In general,geochemical and isotopic analyses indicate that the Deerlong granite is metaluminous or peraluminous,calc alkaline (some are high K)S type granite.Its primitive magma could be mainl

辽西台里地区花岗质岩石主要由花岗质片麻岩、斑状花岗质片麻岩和黑云母二长花岗岩等组成，这些花岗质岩石均曾被视为新太古代花岗岩。根据各类花岗质岩石的产状序次关系确定，块状/片麻状黑云母二长花岗岩呈岩脉或岩枝状侵入太古宙花岗质片麻岩和斑状花岗质片麻岩中，分别出露于研究区南北两侧。地球化学研究表明，黑云母二长花岗岩属于准铝质弱过铝质的 I 型花岗岩，显示火山弧花岗岩的特点。黑云母二长花岗岩中锆石组成复杂，大量继承性锆石和新生锆石共存。新生锆石岩浆结晶特征明显，内部发育振荡生长环带，并具较高的 Th/U 值（0．15～1．70）。两个样品的新生锆石 U Pb 定年结果（加权平均年龄）分别为（153．7±2．0）Ma 和（153．7±4．7）Ma。研究表明，黑云母二长花岗岩为源自下地壳中基性火成岩的晚侏罗世花岗质侵入岩，其构造背景与古太平洋板块向亚洲大陆下俯冲作用有关。

The granitoid rocks in Taili area,western Liaoning Province,are mainly composed of granitic gneiss, porphyritic granitic gneiss and biotite adamellite, and were once regarded as the Neoarchean granite.According to the occurrence sequence of various types of granitic rocks,the authors consider that the massive/gneissic biotite adamellite,located in south and north sides of the study region, intruded into granitic gneiss and porphyritic granitic gneiss as the apophysis or dike.Geochemical characteristics indicate that the biotite adamellite belongs to metaluminous-weakly peraluminous I-type granite, and shows volcanic arc granite characteristics. Zircons in the biotite adamellite are of complex origin.A large number of inherited zircons coexist with neonatal zircons. Neonatal zircons with obvious characteristics of magmatic crystallization are characterized by oscillating growth zonation and high Th/U values (0.15 1.70).Weighted average ages of two samples by LA ICP MS zircon U Pb are (1

良村花岗岩体出露于赣南兴国县良村镇,为兴国地区燕山早期第一阶段首次岩浆活动的产物,显示同构造花岗岩的产出特征。岩石类型以黑云母花岗岩为主,二云母花岗岩、花岗闪长岩次之,均为过铝质-强过铝质,轻稀土元素富集明显,属壳源物质低程度部分熔融所成的S型花岗岩或壳源重熔型花岗岩。4个岩石样品的锆石LA-ICP-MS测年结果显示,该花岗岩体侵位于147~158 Ma,属晚侏罗世,并且至少经历了10 Ma的结晶-成岩史。

The Liangcun granites outcrop within Liangcun town, Xingguo county, in the south of Jiangxi province. The Liangcun granites are product of the PhaseⅠmagmatism of the Early Yanshanian, displaying characteristics of syn-tectonic granite. The batholith consists mainly of biotite-granite which is intruded by the latter stages of dimicaceous-granite and granodiorite. The Liangcun granites are peraluminous to strongly peraluminous, and show LREE enriched patterns. The Liangcun granites are“S-type”or crustal remelting granite derived from low degree partial melting of crustal materials. The LA-ICP-MS zircon U-Pb dating results of 4 granite samples indicate that the Liangcun granites were emplaced at 158 to 147 Ma, i.e., the Late Jurassic. The cooling and crystallization of the Liangcun granites may have lasted~10 Ma as suggested by the isotopic ages.