新疆东准噶尔老鸦泉富碱花岗岩型锡矿床地质及成矿流体

老鸦泉碱性花岗岩位于新疆北部东准噶尔地区。老鸦泉碱性花岗岩体及其内卡姆斯特、干梁子锡矿床的矿石和岩石的岩矿鉴定、稀土元素以及流体包裹体的系统研究表明,老鸦泉碱性花岗岩及其内的花岗斑岩及含矿石英岩、云英岩化锡矿体、石英脉锡矿体,实际上是富碱花岗质岩浆逐渐分异演化的同源和最终产物,锡成矿流体为中-高温、低盐度。碱性岩浆晚期分异的大量气水热液富锡、富硅、富碱、富含F、Cl、SO²₄离子及离子团,其氧逸度高、酸度高、温度高,这种热液引起花岗岩体的硅化、云英岩化等自变质作用,在该作用中随温度、压力的降低及CH₄等还原性气体及CO₂气体的逃逸,改变了成矿流体的氧化-还原环境,流体向相对还原及碱性条件转化,在新的氧化还原、酸碱度界面条件下,其携带的锡的络合物不稳定而分解,锡沉淀成矿。     

湖南瑶岗仙花岗岩体中包体的地质地球化学特征与岩浆演化

湖南瑶岗仙钨矿床与成矿有关的碱长花岗岩岩株中发育多种类型包体,包括花岗岩、石英闪长斑岩、黑色包体及云英岩析离体等。这些包体的地质地球化学性质不同,来源和演化路径不同,记载着瑶岗仙花岗岩成因和岩浆分异演化的历史。对这些包体岩石学、地球化学的研究,结合岩体本身和区域燕山早期花岗岩基的对比研究,明确了花岗岩包体(Ⅰb)来自深部岩浆房中早期结晶的花岗岩,性质与区域花岗岩相近;石英闪长斑岩和黑色包体为前寒武纪变质岩在重熔时的残留;云英岩析离体是由花岗岩Ⅰ的岩浆晚期进一步分异形成的浆液过渡态流体结晶沉淀而成;产于石英斑岩中的细粒黑云母花岗岩包体(Ⅲb)捕获自岩浆房中分异的补体或补体上升时初步分异形成的花岗岩。形成瑶岗仙岩体的花岗岩高度富含挥发分,致使其中的包体强烈同化混染,并富含萤石、云母、电气石等以及硫化物矿物。瑶岗仙岩体是区域花岗岩基所代表的岩浆房高度分异的岩浆上侵的产物,石英斑岩岩浆直接来自于岩浆房结晶分异残留岩浆,而非瑶岗仙岩体的分异产物。建立了瑶岗仙地区燕山早期岩浆演化序列:岩浆房主体(二长花岗岩)→细粒黑云母花岗岩(补体)→碱长花岗岩岩株→浆液过渡态流体成矿→石英斑岩脉侵入。     

福建将乐新路口花岗岩体地球化学特征、锆石U-Pb年龄及成矿意义

通过研究福建省将乐新路口花岗岩体岩石学、地球化学和同位素年代学特征,探讨了该岩体的形成时代、岩浆成因及与钨锡矿的成矿关系。新路口花岗岩体高硅,属于准铝质-过铝质花岗岩;富碱质,贫铁镁,Ba、Sr、P、Ti和Nb强烈亏损,球粒陨石标准化稀土元素配分模型为Eu强烈亏损的“海鸥型”,属于高分异S型花岗岩。Nd同位素研究表明,该花岗岩体主要源自地壳。LA-ICP-MS锆石U-Pb年龄结果表明,该岩体形成时代为147~145Ma,属晚侏罗世,钨锡矿的成矿时代也为晚侏罗世,是伸展构造环境下构造-岩浆活动的产物。经历新元古代和志留纪岩浆作用后形成富含钨锡的残留体,晚侏罗世岩浆热液活动对残留体再次熔融,形成富含硅、碱质及F的岩浆-热液,钨锡从残余矿物中迁移,聚集于岩浆房中,经过结晶分异,形成富含矿质的高分异岩浆,沿构造有利部位向浅部运移、结晶,形成钨锡矿体。     

新疆东准噶尔老鸦泉岩体的锆石U-Pb年龄和地球化学组成

老鸦泉岩体是贝勒库都克锡矿带内最大的花岗岩体,它主要由黑云母钾长花岗岩组成。通过对2件样品的锆石LA-ICP-MS U-Pb同位素年龄测定,获得其206Pb/238U年龄值分别为301±2 Ma和300±5 Ma,指示该岩体侵位时代为晚石炭世。岩石地球化学组成表明,老鸦泉碱长花岗岩具有富硅、富碱,相对富集Rb、K、Th、U、Nd、Hf等元素,而贫Ba、Sr、P、Ti等元素,具强负Eu异常,总体显示A型花岗岩的地球化学特征。锆石U-Pb年龄及岩石地球化学特征都表明老鸦泉岩体的形成与晚石炭世北疆强烈的后碰撞岩浆活动有着密切关系。     

伊宁地块阿腾套山塔勒德萨依岩体:高分异花岗岩成因分析北大核心CSCD

为探讨阿腾套山西南缘塔勒德萨依正长花岗岩-花岗斑岩体的形成时代和岩石成因,为伊宁地块石炭纪构造演化提供可靠资料,对塔勒德萨依岩体进行了野外调查、锆石U-Pb定年及地球化学研究。结果显示,花岗斑岩年龄为(338±3)Ma,表明岩体形成于密西西比亚纪。花岗岩的矿物组成接近低共结组分,全岩以高Si、富碱、富K和Rb,低Ti、少Fe、Ca、Mg,贫Ba、Sr、P等为特征,表明其为高分异花岗岩类。结合区域同时代(362~325 Ma)岩浆岩的地球化学资料,认为该花岗岩的母岩浆由混合地壳(新生地壳和元古代角闪岩相基底)部分熔融形成且母岩浆历经了斜长石、角闪石、黑云母、磷灰石和锆石等矿物的分离结晶。综合区域资料认为,塔勒德萨依岩体形成于弧后盆地,此类高分异花岗岩的形成可能标志着维宪期(338 Ma)南天山洋已进入衰亡期。     

江西会昌锡矿花岗质喷出——侵入岩建造的岩石特点及其成因

本文通过对会昌岩背火山岩、花岗岩的地质学、岩石学、地球化学特征研究，认为火山岩与花岗岩是同源岩浆结晶分异的产物。花岗岩是由于地幔或下地壳富碱稀薄岩浆上侵，引起上地壳物质同熔，形成中酸性岩浆，经在深部岩浆房充分分异演化，形成酸性岩浆上侵结晶形成的产物。     

中缅毗邻区金腊Pb-Zn-Ag多金属矿田花岗岩锆石U-Pb定年与地球化学特征

位于中缅毗邻区的金腊铅锌银多金属矿田大地构造上处于保山—掸泰地块东缘,勐统—耿马—西盟元古宙—古生代被动大陆边缘活动带南段。与矿化有关的花岗岩(简称金腊花岗岩)包括老厂似斑状角闪二长花岗岩、勐林山似斑状黑云二长花岗岩和南腊碱长花岗斑岩。文中系统研究了上述岩石的主量元素、稀土元素、微量元素、成矿元素和锆石U-Pb同位素年龄等特征,从构造岩浆演化的角度,探讨上述岩体之间内在联系、成因演化以及与成矿的关系:(1)在金腊花岗岩三种岩石类型中,老厂似斑状角闪二长花岗岩和勐林山似斑状黑云二长花岗岩的锆石同位素U-Pb年龄皆为(45±1)Ma,形成于岩浆结晶分异早期阶段的深成环境,而南腊碱长花岗斑岩的锆石同位素U-Pb年龄为(43.41±0.78)Ma,形成于岩浆结晶分异晚期阶段的浅成环境。(2)主量元素和微量元素(稀土元素和某些微量元素(Zr/Hf、Nb/Ta、Rb/Sr、Rb/Ba、K/Rb、(Rb/Yb)N、Sr*、K*和Zr*)),结合U-Pb同位素定年研究表明,本区花岗岩形成于喜马拉雅同碰撞造山成矿作用末期局部拉张构造环境,并分别代表了构造岩浆演化过程中不同演化阶段岩浆分异结晶的产物。(3)上述三类花岗岩样品皆位于S型花岗岩区,但从老厂似斑状角闪二长花岗岩,勐林山似斑状黑云二长花岗岩,到南腊碱长花岗斑岩,样品分布逐渐远离"I"型花岗岩和"S"型花岗岩的分界线,这表明自老厂似斑状角闪二长花岗岩至勐林山似斑状黑云二长花岗岩,到南腊碱长花岗斑岩幔源组分逐渐减少。(4)相对中国花岗岩,南腊碱长花岗斑岩不仅更富集W、Cu、Bi、Sb、Mo、Sn、Ag、Pb和Au等成矿元素,而且还强烈富集F、B和As等矿化剂元素,因此,碱长花岗斑岩是最有成矿远景的岩体。     

内蒙古哈达庙含金侵入杂岩体的基本地质特征及岩体成因问题

本文从岩相学、地球化学和同位素地质研究角度出发,详细论证了哈达庙含金侵入杂岩体的地质地球化学特征、成因机制及其与金矿化的关系。研究认为:侵入杂岩体内的闪长玢岩、石英闪长岩、花岗闪长岩、花岗斑岩和隐爆火山角砾岩是同源岩浆不同演化阶段的产物,成岩成矿物质来源与含基性岩成分较多的陆壳岩石深熔作用有关。从杂岩体边缘到核部,随着岩体从中基性到酸性方向的演化,碱质组分、成矿元素(Au、Ag)和挥发份的不断聚集,不仅形成了一系列隐爆火山角砾岩脉,同时也促进了金的沉淀富集。对比研究表明:流纹岩脉与侵入杂岩体是异源岩浆不同演化阶段的产物。     

西准噶尔南部庙尔沟岩体晚石炭世花岗闪长斑岩岩石成因及其动力学背景

位于西准噶尔南部的庙尔沟岩体主体由碱长花岗岩和少量紫苏花岗岩组成。本文在前人工作基础上,以岩体东南边缘新发现的花岗闪长斑岩为研究对象,开展岩石学、年代学和Hf同位素以及全岩地球化学研究,确定花岗闪长斑岩形成时代、揭示岩石成因类型及源区属性、探讨其与碱长花岗岩和紫苏花岗岩岩浆演化成因联系及其形成的深部动力学过程。锆石U-Pb定年结果显示,花岗闪长斑岩形成于317.4±1.9Ma,为晚石炭世早期岩浆活动的产物,明显早于紫苏花岗岩(～307Ma)和碱长花岗岩(～303Ma)。岩石地球化学数据表明,花岗闪长斑岩具有较高硅、中等铝,贫钙、铁、镁,富集Rb、K、Th、U,强烈亏损Nb、Ta、Ti的特征,为钙碱性弱过铝质I型花岗岩;紫苏花岗岩更多的表现出钙碱性-高钾钙碱性镁质I型紫苏花岗岩特征;碱长花岗岩为碱性准铝质-弱过铝质A型花岗岩。锆石Hf同位素分析结果表明,花岗闪长斑岩、紫苏花岗岩和碱长花岗岩均具有高正的ε_(Hf)(t)值(+11.6～+15.8)和年轻的二阶段模式年龄(325～600Ma),表明其原始岩浆主要起源于亏损地幔新衍生的年轻地壳物质。综合分析认为,庙尔沟岩体花岗闪长斑岩形成于晚石炭世早期洋壳俯冲背景,由底侵的、受流体交代的幔源基性岩浆与其诱发的年轻下地壳酸性岩浆在深部混合而成。紫苏花岗岩和碱长花岗岩形成于弧后伸展背景,前者是伸展初期继续底侵于下地壳的幔源玄武质岩浆降温释放大量的水和热诱使早期侵位于下地壳的镁铁质岩石再次发生部分熔融的产物,后者是伸展后期大规模软流圈地幔上涌底垫加热年轻中下地壳使其部分熔融而成。     

皖南地区青阳-九华山复式岩体的成因

复式岩体是指不同时代花岗岩类侵入体在空间上的共生。对复式岩体的研究,有助于了解不同时代花岗岩类的形成和分布与构造演化的关系,从而阐明花岗岩浆侵入、定位的机制。皖南地区广泛发育燕山期复式岩体,本文对该区最大和最具代表性的青阳-九华山复式岩体的地质概况、成岩年代和地球化学特征进行研究,探讨复式岩体的成因和侵位机制。锆石U-Pb定年结果表明,该复式岩体从早到晚四个阶段岩浆岩年龄分别为第一阶段花岗闪长岩143.3±1.0Ma,第二阶段二长花岗岩137.6±1.5Ma,第三阶段钾长花岗岩131.3±1.2Ma,第四阶段花岗斑岩132.0±2.0Ma。所有岩石均属于高钾钙碱性、准铝质-弱过铝质系列,从花岗闪长岩-二长花岗岩-钾长花岗岩-花岗斑岩显示出由钙碱性向碱性过渡的特征,并具有向富K、Si和贫Ca、Mg、Fe演化的趋势。该复式岩体源自同一个初始岩浆房,不同阶段岩浆沿相同的通道先后上升侵位至相邻空间叠加形成复式岩体的格局,这也是本区此类复式岩体的形成机制。早期形成的花岗闪长岩-二长花岗岩主要源自下地壳岩石的部分熔融,而晚期岩浆房中加入了较早期更多的底侵幔源岩浆,并与之完全混合,在上升侵位过程中经历了更强的分离结晶和地壳同化混染作用,形成钾长花岗岩-花岗斑岩。早期的花岗闪长岩-二长花岗岩形成与晚侏罗世古太平洋板块的俯冲作用密切相关,晚期钾长花岗岩-花岗斑岩形成于陆内拉张环境,反映出研究区从与太平洋板块俯冲有关的挤压环境向陆内岩石圈伸展环境的转变。     

华南诸广山岩体中段岩脉40Ar-39Ar年龄及与铀成矿关系

诸广山岩体中段鹿井地区矿床周边常有花岗斑岩脉及煌斑岩脉等晚期岩脉产出。钾长石40Ar-39Ar同位素年代学测试结果表明,花岗斑岩脉与煌斑岩脉侵位年龄分别为116.24±0.49 Ma和128.27±0.86 Ma,是早白垩世地壳伸展的岩浆响应。岩脉记录的岩浆活动时代与鹿井矿田铀成矿作用时代具有较好的对应关系。花岗斑岩脉与铀矿石均具有幔源特征,表明以花岗斑岩为代表的酸性岩浆在为铀矿化提供热源的同时可能还提供了部分成矿物质。在铀成矿作用过程中,以煌斑岩为代表的基性岩浆为铀成矿作用提供了热源、矿化剂、流体及动力条件等有利条件。     

论内蒙古额仁陶盖银矿床成岩成矿模式

额仁陶盖银矿床是次火山热液作用产物。燕山晚期本区受太平洋板块边缘的影响,在已存断裂复活条件下,产生壳幔混合作用形成花岗质岩浆,该岩浆在地下浅处发生强烈的结晶分异作用,形成花岗岩和石英斑岩,两者是同一岩浆不同成岩阶段的产物。石英斑岩是成岩阶段的最后产物。分异作用导致银在成岩期及期后成矿热液中富集。矿床地质地球化学证据表明石英斑岩是矿体的直接母岩。地表大气水在成岩成矿中起着重要作用:①有助于发生基底岩石的部分熔融;②有助于岩浆的结晶分异并导致银在石英斑岩( 浆) 中的富集;③有利于形成大量的矿液。     

Field evidence,mineral chemical and geochemical constraints on mafic-felsic magma interactions in a vertically zoned magma chamber from the Chotanagpur Granite Gneiss Complex of Eastern India

The Nimchak granite pluton (NGP) of Chotanagpur Granite Gneiss Complex (CGGC), Eastern India, provides ample evidence of magma interaction in a plutonic regime for the first time in this part of the Indian shield. A number of outcrop level magmatic structures reported from many mafic-felsic mixing and mingling zones worldwide, such as synplutonic dykes, mafic magmatic enclaves and hybrid rocks extensively occur in our study domain. From field observations it appears that the Nimchak pluton was a vertically zoned magma chamber that was intruded by a number of mafic dykes during the whole crystallization history of the magma chamber leading to magma mixing and mingling scenario. The lower part of the pluton is occupied by coarse-grained granodiorite (64.84–66.61?wt.% SiO₂), while the upper part is occupied by fine-grained granite (69.80–70.57?wt.% SiO₂). Field relationships along with textural and geochemical signatures of the pluton suggest that it is a well-exposed felsic magma chamber that was zoned due to fractional crystallization. The intruding mafic magma interacted differently with the upper and lower granitoids. The lower granodiorite is characterized by mafic feeder dykes and larger mafic magmatic enclaves, whereas the enclaves occurring in the upper granite are comparatively smaller and the feeder dykes could not be traced here, except two late-stage mafic dykes. The mafic enclaves occurring in the upper granite show higher degrees of hybridization with respect to those occurring in the lower granite. Furthermore, enclaves are widely distributed in the upper granite, whereas enclaves in the lower granite occur adjacent to the main feeder dykes.Geochemical signatures confirm that the intermediate rocks occurring in the Nimchak pluton are mixing products formed due to the mixing of mafic and felsic magmas. A number of important physical properties of magmas like temperature, viscosity, glass transition temperature and fragility have been used in magma mixing models to evaluate the process of magma mixing. A geodynamic model of pluton construction and evolution is presented that shows episodic replenishments of mafic magma into the crystallizing felsic magma chamber from below. Data are consistent with a model whereby mafic magma ponded at the crust-mantle boundary and melted the overlying crust to form felsic (granitic) magma. The mafic magma episodically rose, injected and interacted with an overlying felsic magma chamber that was undergoing fractional crystallization forming hybrid intermediate rocks. The intrusion of mafic magma continued after complete solidification of the magma chamber as indicated by the presence of two late-stage mafic dykes.     

Formation of the strata-bound Kellhuani tin deposits,Bolivia

A magmatic-hydrothermal model of tin ore formation can best explain the geological, petrographical and geochemical data on the strata-bound Kellhuani tin district. The tin specialization of the magmatic system of the Chacaltaya porphyry stock, centered in the Kellhuani mining area, is the result of advanced fractional crystallization. The regional tin background of the least fractionated members of the Cordillera Real granite series and of their sedimentary country rocks corresponds to average crustal tin contents.Dedicated to Prof. H.-J. Schneider on the occasion of his 60th birthday     

东秦岭尚古寺斑岩钼矿地质特征及成矿潜力分析

尚古寺斑岩钼矿位于东秦岭,为东秦岭地区已知钼矿区的最东部端元。出露面积约1．5km^2,围岩主要为元古代片麻岩和碱流岩。辉钼矿化主要发育在花岗斑岩体的东部和南部区域,花岗斑岩顶部细粒花岗斑岩和其上覆花岗质伟晶岩均呈浸染状矿化,南部角岩发育裂隙矿化。花岗斑岩主体岩性主要矿物组合为石英、钾长石和斜长石,显示具有富硅、富碱和...     

内蒙古赤峰维拉斯托大型锡多金属矿的地质地球化学特征

2014年发现的维拉斯托锡锌矿是继20世纪末该矿区铜锌矿之后的重要找矿进展,已控制Sn金属资源量10万t。成矿作用与隐伏花岗岩体有关,该岩体侵入于前寒武纪变质岩中。矿化类型包括岩体顶部的花岗岩型锡锌矿、岩体外侧的石英脉型锡锌矿以及外围的铜锌矿。针对花岗岩、各类矿体开展了岩石学、矿床学、主微量元素地球化学、年代学等研究,初步查明岩浆演化机制、矿床成因及三类矿化的关系。细粒斑状碱长花岗岩La-ICPMS锆石UPb年龄(139.5±1.2)Ma(MSWD=3.3)。岩石中发育多级斑晶,结晶(沉淀)顺序为钠长石→石英→钾长石→钠长石→石英、黄玉、锡石、闪锌矿。花岗岩富Si O2贫Al2O3、Ti O2、TFe2O3、Ca O等,高Rb、Cs、Nb、Ta及W、Mo、Bi、Cu、Zn、In等元素,低Sr、Ba等,钠长石An0.3,与锡钨多金属矿成矿花岗岩性质相似。岩浆晚期经历了岩浆-热液过渡阶段(浆液过渡态流体),自硅酸盐相中分离出富Si、富F和富S的流体相,分别形成花岗岩型矿石中的石英、黄玉、锡石-闪锌矿囊状体(珠滴),伴随熔融包裹体和熔流包裹体,晚期逐渐、连续地向热液阶段过渡。岩浆-热液过渡阶段在岩体顶部形成花岗岩型锡锌矿石,热液阶段在岩体外侧和外围形成石英脉型锡锌矿及铜锌矿、铅锌银矿。这些矿体连同成矿花岗岩共同构成岩浆-热液型锡多金属矿床成矿系统。锡林郭勒—赤峰地区,很多脉状铅锌银矿的成矿作用与酸性侵入岩有关,深部可能存在大规模岩浆-热液型锡(钨)多金属矿。     

Mafic and Felsic Magma Interaction in Granites: the Hercynian Karkonosze Pluton (Sudetes, Bohemian Massif)

The Hercynian, post-collisional Karkonosze pluton contains severallithologies: equigranular and porphyritic granites, hybrid quartzdiorites and granodiorites, microgranular magmatic enclaves,and composite and lamprophyre dykes. Field relationships, mineralogyand major- and trace-element geochemistry show that: (1) theequigranular granite is differentiated and evolved by smalldegrees of fractional crystallization and that it is free ofcontamination by mafic magma; (2) all other components are affectedby mixing. The end-members of the mixing process were a porphyriticgranite and a mafic lamprophyre. The degree of mixing variedwidely depending on both place and time. All of the processesinvolved are assessed quantitatively with the following conclusions.Most of the pluton was affected by mixing, implying that hugevolumes (>75 km³) of mafic magma were available. This maficmagma probably supplied the additional heat necessary to initiatecrustal melting; part of this heat could have also been releasedas latent heat of crystallization. Only a very small part ofthe Karkonosze granite escaped interaction with mafic magma,specifically the equigranular granite and a subordinate partof the porphyritic granite. Minerals from these facies are compositionallyhomogeneous and/or normally zoned, which, together with geochemicalmodelling, indicates that they evolved by small degrees of fractionalcrystallization (<20%). Accessory minerals played an importantrole during magmatic differentiation and, thus, the fractionalcrystallization history is better recorded by trace rather thanby major elements. The interactions between mafic and felsicmagmas reflect their viscosity contrast. With increasing viscositycontrast, the magmatic relationships change from homogeneous,hybrid quartz diorites–granodiorites, to rounded magmaticenclaves, to composite dykes and finally to dykes with chilledmargins. These relationships indicate that injection of maficmagma into the granite took place over the whole crystallizationhistory. Consequently, a long-lived mafic source coexisted togetherwith the granite magma. Mafic magmas were derived either directlyfrom the mantle or via one or more crustal storage reservoirs.Compatible element abundances (e.g. Ni) show that the maficmagmas that interacted with the granite were progressively poorerin Ni in the order hybrid quartz diorites—granodiorites—enclaves—compositedykes. This indicates that the felsic and mafic magmas evolvedindependently, which, in the case of the Karkonosze granite,favours a deep-seated magma chamber rather than a continuousflux from mantle. Two magma sources (mantle and crust) coexisted,and melted almost contemporaneously; the two reservoirs evolvedindependently by fractional crystallization. However, maficmagma was continuously being intruded into the crystallizinggranite, with more or less complete mixing. Several lines ofevidence (e.g. magmatic flux structures, incorporation of granitefeldspars into mafic magma, feldspar zoning with fluctuatingtrace element patterns reflecting rapid changes in magma composition)indicate that, during its emplacement and crystallization, thegranite body was affected by strong internal movements. Thesewould favour more complete and efficient mixing. The systematicspatial–temporal association of lamprophyres with crustalmagmas is interpreted as indicating that their mantle sourceis a fertile peridotite, possibly enriched (metasomatized) byearlier subduction processes. KEY WORDS: Bohemian Massif; fractional crystallization; geochemical modelling; hybridization; Karkonosze     

西天山吐拉苏岩体中花岗岩的年代学和地球化学特征及其地质意义

吐拉苏岩体位于西天山吐拉苏盆地的东北缘,由石英闪长玢岩、辉石闪长玢岩和花岗岩组成,其中花岗岩主要为花岗闪长玢岩和花岗斑岩.它们表现出高硅、高铝、富碱的特征,里特曼指数（σ）=1.61~3.18,A/CNK=1.00~1.09,A/NK=1.07~1.68,为准铝质-弱过铝质高钾钙碱性花岗岩;相对富集Rb、Th、U等大离子亲石元素,明显亏损Nb、Ta、Sr、P、Ti等元素;轻重稀土分馏明显,（La/Yb）_N=7.48~12.12、中等Eu负异常（δEu=0.47~0.62）,无Ce异常.但花岗斑岩较花岗闪长玢岩碱含量更高,更加接近准铝质钾玄岩系列,Sr、P、Ti等元素的亏损程度更强,且轻稀土更富集,可能说明花岗斑岩中壳源物质含量增加.锆石LA-ICP-MS U-Pb定年研究获得花岗斑岩的侵位年龄为305.9±5.9 Ma.锆石Hf同位素组成显示,ε_Hf（t）值介于0.4~8.7,表明花岗岩的岩浆源区有幔源物质的加入;T_DM2值介于766~1 294 Ma,表明岩浆源区为中元古代-新元古代新生地壳.综合吐拉苏岩体中两类花岗岩的地质、地球化学特征、年代学和区域地质背景,认为从花岗闪长玢岩到花岗斑岩结晶分异增强、壳源物质的贡献增大,花岗岩形成于后碰撞环境,岩浆源区为中元古代-新元古代新生地壳,但有不同比例幔源物质的加入.