矿物成分标型继承性与金矿矿质来源

本文在阐述胶东金矿成矿过程的基础上，重点研究了胶东地区不同地质体组成矿物中Ｃｒ元素分布特征及含Ｃｒ矿物的自然演化历史。揭示了含Ｃｒ矿物成分标型显著的继承性规律。胶东金矿脉石矿物中出现翠绿色含Ｃｒ绢云母，矿石矿物中出现含Ｃｒ金银矿至自然金矿物系列。其中的Ｃｒ，均是从以中基性变质火山岩为主的胶东群部分重熔所形成的Ⅰ型花岗岩类，经动力及热液蚀变释放出来的。故利用Ｃｒ元素这一示踪性特征，便可有效地揭示与Ｃｒ相伴相随的Ａｕ（也包括Ｆｅ）来源于胶东群地层。提出开展不同作用、不同时期、不同阶段中含Ｃｒ矿物成分标型的系统研究，可为探讨金矿成矿物质来源提供新的矿物学方法。     

金矿床中“绿化”──含铬绢云母化及其找矿意义

详细研究了胶东金矿中含铬绢云母的颜色、粒径、形态、化学成分、晶体结构、光性等标型特征，提出了“红化”与“绿化”相结合的金矿找矿方法。探讨了含铬绢云母的形成机理，利用Ｃｒ元素的示踪性，揭示了胶东金矿成矿作用与成岩作用乃至矿源层的继承关系。     

台上金矿床蚀变带短波红外光谱研究

绢云母是胶东西北部金矿的主要蚀变矿物.短波红外光谱测量可以提供云母类A10H波长、结晶度、云母(蚀变)强度、云母层间水强度等参数,这些参数可以用来研究蚀变特征、预测金矿化.为确定招平断裂带内已知金矿化的蚀变矿物特征,为在区域上寻找类似特征地段提供类比依据,在台上特大型金矿上下盘围岩1 km之内采集岩石样品,利用便携式红外矿物分析仪(PIMA)进行短波红外光谱测量.结果表明上盘含更多的白云母、具有更高的云母水强度,多硅白云母发育在下盘.高结晶度的云母和更多的多硅白云母是金矿化的指示.     

福建溪源头伟晶岩及围岩中的云母特征

作者对福建溪源头稀有金属花岗伟晶岩及其围岩中的40余个云母样品进行了成分、物性、结构及热性质的综合研究。溪源头伟晶岩之不同组合带中产出的云母均为2M_1型含铷白云母,云母中含铷、铯而贫锂、贫氟。云母斜长变粒岩中的白云母为含铁白云母。其中钛、镁含量偏高。石英云母片岩中之3T铝黑鳞云母的八面体阳离子占位介于二八面体和三八面体之间。该云母以富稀碱元素及挥发分为其特征。溪源头云母的成分及种属反映了形成它的地质环境特点,与围岩性质及成矿类型有关,可作为稀有金属伟晶岩矿床的标型矿物,可以用作找矿标志。     

安徽某地蓝晶石单矿物分离及人工重砂定量分析方法

一、岩石的物质组份及主要矿物特征蓝晶石产于蓝晶石岩、蓝儡石白云母石英片岩及含蓝晶石白云母石英片岩三个类型的岩石中。其中蓝晶石岩含蓝晶石50—90%,次要矿物为绢云母、褐铁矿、刚玉、金红石、榍石等。蓝晶石白云母石英片岩含蓝晶石10—30%,主要矿物为石英、白云母,少量矿物有赤铁矿、金红石、黄铁矿等,蓝晶石与白云母呈反消长关系。含蓝晶石白云母石英片岩中,蓝晶     

甘肃李坝金矿围岩蚀变与金成矿关系

西秦岭地区是目前国内造山型和卡林型金矿找矿的热点地区之一,已发现的甘肃李坝造山型金矿为超大型规模。以李坝金矿6号矿带为例,系统地研究了其蚀变矿物组合、近矿围岩蚀变分带及相应的金矿化特征,总结了矿床(带)的蚀变分带模式。该模式具典型的中心式环带结构,可分为3个蚀变带,由中心向外依次为黄铁绢英岩化带、绢云母化带和绿泥石化带。蚀变矿物组合分别为黄铁矿+绢云母+石英±毒砂±白云母±电气石±方解石、绢云母+绿泥石+石英+黄铁矿±黑云母及绿泥石+黑云母±绢云母±黄铁矿;与这3个蚀变带相对应的是金的富集带、矿化带和无矿带。蚀变岩石物质组分迁移分析表明,围岩蚀变及其分带是热水流体/岩石反应时岩石化学组分发生迁移的结果,矿化伴随着蚀变发生,且金矿化与黄铁矿化和浸染状硅化关系最为密切。     

西藏雄村斑岩型铜金矿红柱石成因矿物学特征

雄村斑岩铜金矿中广泛分布有红柱石,红柱石主要呈三种产出状态:①石英-钾长石-白云母/绢云母-红柱石组合;②红柱石-石英-绢云母/白云母组合;③石英-红柱石-硫化物脉.矿物组合关系、红柱石结构和成分等特征均表明红柱石属热液成因.早期钾硅酸盐化带中的石英-钾长石-白云母/绢云母-红柱石组合形成于高温(大于550℃)、低+K...     

应用X射线衍射-扫描电镜-光学显微镜鉴定黑龙江石墨尾矿中的绢云母

石墨尾矿作为一类二次资源,当云母类矿物的含量在10%以上时,具有回收利用价值。黑龙江某地石墨尾矿中含有10%以上的云母类矿物,但其细度(500~800目)低于常规的云母矿,本文采用X射线衍射(XRD)分析矿物组成,再结合化学分析、扫描电镜-能谱、光学显微镜与纯矿物进行对比,由此鉴定云母类矿物种属。XRD研究初步表明石墨尾矿含有的云母族矿物属于白云母亚类或黑云母亚类。扫描电镜分析表明尾矿中的云母矿物与纯绢云母矿物均以片状和鳞片状为主要存在形态,而纯黑云母主要以片状形式存在。尾矿的Si O2含量为5%~13%,Al2O3含量为4%~8%,与纯绢云母接近。光学显微镜鉴定显示在正交偏光下石墨尾矿中的云母颜色和纯绢云母类似,而与纯黑云母截然不同。综合以上结果最终可确定该地石墨尾矿中的云母族矿物为白云母亚类中的绢云母。本研究为后续石墨尾矿的选矿工艺奠定了基础,也可应用于类似细度绢云母的鉴定。     

新疆阿希晚古生代冰长石-绢云母型金矿特征

论述了新疆阿希晚古生代冰长石-绢云母型金矿的地质特征,它与环太平洋火山带上的中、新生代冰长石-绢云母型金矿具有许多相似之处.揭示了该区成矿构造环境、成矿条件,论证了阿希金矿的矿床成因和金矿类型.     

新疆阿希晚古生代冰长石—绢云母型金矿特征

论述了新疆阿希晚古生代冰长石－绢云母型金矿的地质特征,它与环太平洋火山带上的中,新生代冰长石－绢云母型金矿具有许多相似之我成矿构造环境,成矿条件,论证了阿希金矿的矿床成因和金矿类型。     

胶东焦家金成矿带2420~3206 m垂深金矿物和黄铁矿微量元素特征

在胶东莱州吴一村地区完成的3266.06 m深钻,是目前焦家金成矿带最深见矿钻孔,研究钻孔揭露的深部矿石中金矿物及黄铁矿微量元素特征,对探讨深部成矿作用演化具有重要意义。笔者采取深钻中2420~3206 m垂深的岩（矿）芯样品进行了详细的岩相学和矿相学研究,结合扫描电镜和电子探针微区分析,研究了矿石中金矿物的赋存状态和成分。对不同成矿阶段形成的黄铁矿进行了LA-ICPMS微量元素分析。研究结果表明,深部矿石中载金矿物主要为黄铁矿,其次为石英、黄铜矿、方铅矿,可见金主要以自然金和银金矿的形式存在,以晶隙金和裂隙金为主,其次为包体金。与浅部金矿床比较,深部金的成色较高。黄铁矿分为6种类型,第Ⅰ成矿阶段形成富Co型黄铁矿Py1,第Ⅱ成矿阶段形成富Ni型黄铁矿Py2a和Py2b,第Ⅲ成矿阶段形成富Au、As型黄铁矿Py3a和富Au、Ag、Pb、Bi型黄铁矿Py3b,第Ⅳ成矿阶段形成贫微量元素黄铁矿Py4。其中,Py1和Py2a发生强烈破碎,裂隙表面对热液中的Au络合物产生吸附作用,对金沉淀富集起重要作用。黄铁矿中Co、Ni、As等微量元素主要以类质同象形式赋存,而Au、Ag、Cu、Pb、Zn、Bi等主要以纳米级、微米级矿物包体形式赋存。Pb+Bi、Cu+Pb+Zn、Te+Bi与Au+Ag呈明显正相关,而Au与As相关性较差。黄铁矿中Co、Ni含量较低,而Au+Ag+As或Au+Ag+Pb+Bi+Cu含量较高指示成矿有利。另外,黄铁矿中Co、Ni含量较高,并且破碎强烈,成矿相关元素含量较高也指示成矿有利。     

西藏列廷冈铁多金属矿床磁铁矿元素地球化学特征及地质意义

西藏列廷冈矿床是林周盆地Fe-Mo-Cu-Pb-Zn矿集区内近年来新发现不久、规模较大的矽卡岩型铁多金属矿床。矿区磁铁矿发育,主要包括块状、浸染状和脉状3种类型。基于详细的野外地质调查和室内矿相学研究,将矿床成矿期划分为矽卡岩期和热液期2期,进而划分为5个成矿阶段:早期矽卡岩阶段、退化蚀变阶段、早期热液阶段、石英-硫化物阶段和碳酸盐阶段,其中,块状磁铁矿主要形成于退化蚀变阶段,浸染状和脉状磁铁矿主要形成于早期热液阶段。以磁铁矿为主要研究对象,采用电子探针(EPMA)和单矿物微量稀土元素ICP-MS分析实验,重点对磁铁矿元素地球化学特征、成因矿物学进行系统研究。研究结果表明,3种不同类型磁铁矿内均含Ti、Si、Ca等次要元素以及Na、K、Cr、Ni、Co、Pb、Ba、Sn、Sr、Sb、Cu等多种可检测到的微量元素,且矿物内主要发生了Al、Mg、Mn等元素的类质同像置换,综合TiO_2-Al_2O_3-MgO、TiO_2-Al_2O_3-(MgO+Mn O)和(Ca+Al+Mn)-(Ti+V)、Ni/(Cr+Mn)-(Ti+V)等多种磁铁矿成因判别图解投图结果及矿体野外宏观地质特征,表明矿区磁铁矿均为热液成因。块状磁铁矿具明显的Eu正异常,浸染状和脉状磁铁矿具Eu负异常,均无明显Ce异常特征,表明富Eu成矿流体在矽卡岩期的高温氧化环境下形成了矽卡岩型块状磁铁矿体,在热液期则逐渐转变为低温还原环境,形成浸染状和脉状磁铁矿及多种金属硫化物,且铁的物质来源主要与矿区花岗闪长岩和花岗斑岩紧密相关。     

Pre-ore hydrothermal alteration in an unconformity-type uranium deposit

 Hydrothermal alteration associated with the formation of unconformity-type uranium deposits is manifested mainly by intense chloritic replacement of metamorphic mineral assemblages. At the Koongarra deposit (northern Australia), three stages of pre-ore alteration were identified in chloritized metamorphic muscovite using optical microscopy, the electron microprobe, and transmission and analytical electron microscopy (TEM and AEM). During the first stage metamorphic muscovite was altered to a mica with very low interlayer occupancy (K content as low as 0.35 compared to 1 for ideal muscovite), high octahedral cation content (up to 2.3 whereas ideal muscovite has 2) and high Si content. High resolution TEM images show that these changes in composition were accompanied by frequent layer terminations in contrast to the metamorphic muscovite, whereas selected area electron diffraction patterns indicate that the altered muscovite remained a two-layer polytype. The alteration of muscovite appears more extensive in the outer alteration halo and has been almost completely eradicated in the ore zone where chloritization is more complete. During the second stage of the pre-ore alteration the altered muscovite was replaced by Mg-rich serpentine (lizardite) and clinochlore. High resolution TEM images show two 10 A˚ mica layers coalescing to one 14 A˚ chlorite layer. This type of coalescence appears to involve transformation of one dioctahedral layer of the mica structure to one trioctahedral brucite layer in the chlorite structure through dissolution of the tetrahedral sheets and cation influx in the octahedral site. The final stage of the pre-ore alteration resulted in replacement of lizardite and clinochlore by Fe-rich chlorite. Comparison of the alteration observed in metamorphic muscovite with the alteration observed in metamorphic biotite and garnet shows clearly that chloritization of these phases was also a pre-ore alteration event. Pre-ore alteration was principally characterized by the evolution of chlorite from a Mg-rich phase to an Fe-rich one. Received: 29 July 1994/Accepted: 8 January 1995     

山东莱州曲家金矿黄铁矿微量元素对成矿过程的指示

曲家金矿位于我国重要的蚀变岩型金矿矿集区之焦家金矿带的中段，矿床赋存标高为-726～-1 334 m。为研究黄铁矿的演化及其对金成矿过程的指示，运用LA-ICP-MS分析黄铁矿原位微量元素含量，结合岩相学观察和点群分析对黄铁矿进行了分类。发现黄铁矿中Co、Ni、As等微量元素主要以类质同像形式赋存，而Au、Ag、Cu、Zn、Pb、Bi等元素主要以纳米级、微米级矿物包裹体形式赋存。黄铁矿主要分为5种类型：富Co型Py1,富Ni型Py2,富Au、As型Py3,富Au、Ag、Pb、Bi型Py4及“干净”型Py5。黄铁矿微量元素特征指示成矿物质可能主要来源于前寒武纪变质基底岩石和中生代岩浆岩，少量来源于地幔，成矿热液可能属变质热液、岩浆热液和浅部大气降水的混合成因。不同类型黄铁矿反映成矿热液由富Co、Ni经富As、Au向富Pb、Bi、Au、Ag演化。Py1和Py2形成后受构造活动影响发生强烈破碎，裂隙表面对热液中金络合物增强的吸附作用促使金在裂隙中沉淀，对金的富集成矿可能起重要作用。Co、Ni含量较低，同时Au、Ag、As、Pb、Bi等元素含量较高的黄铁矿与成矿作用有密切关系。另外，黄铁矿中C...     

浙江多色青田石岩石地球化学特征及成因

多色青田石是浙江青田石中的一个重要品种,具颜色丰富、纹理多变的特点。通过岩相学观察、X射线粉晶衍射物相分析、全岩主量及微量元素和同位素地球化学分析,对多色青田石的岩石学特征、矿物成分、类型划分进行详细研究,并论证了多色青田石的成矿物质、成矿流体来源及成因。研究表明:多色青田石按主要组成矿物划分属于叶蜡石型青田石和绢云母型青田石;其颜色主要与组成矿物中Fe、Ti、Cr、Mn致色元素的类型和含量有关,其次与赤铁矿(褐铁矿)浸染组成矿物的微晶间隙和充填微裂隙有关。多色青田石的成矿母岩为中酸性火山岩,成矿流体来源与大气降水有关。多色青田石主要由早期充填成因的叶蜡石矿物和晚期由中低温热液蚀变改造早期叶蜡石形成的绢云母矿物构成,是多期多阶段热液蚀变交代成矿作用的产物,多色青田石中常保留高温矿物红柱石。     

山东栖霞笏山金矿床成因——元素地球化学与流体包裹体证据

笏山金矿床为陡崖断裂带南段内最大的金矿床,为了揭示其矿床成因,在矿床地质研究的基础上开展了矿体围岩元素地球化学和流体包裹体研究。研究结果表明：笏山金矿床沿NE向断裂发育大规模的热液蚀变带,地表出露的断裂带形成一个庞大的面形蚀变带,矿化较弱,分带不明显,钻孔显示金矿体两侧依次发育黄铁绢英岩、绢英岩化花岗岩蚀变带和二长花岗岩,金矿体主要产于陡崖断裂带下盘黄铁绢英岩蚀变带内。质量平衡计算表明：绢英岩化过程中,主量元素SiO₂、Al₂O₃、FeO、MnO、Na₂O、K₂O、P₂O₅和部分稀土元素从二长花岗岩中迁出,而MgO、CaO、Fe₂O₃,成矿元素Au、Ag,亲硫元素Cu、Pb及亲铁元素V、Cr、Co、Ni迁入二长花岗岩;黄铁绢英岩化过程中,主量元素FeO、Fe₂O₃、MnO、MgO、CaO,成矿元素Au、Ag,亲硫元素Cu及亲铁元素V、Cr、Co、Ni迁入,SiO₂、Al₂O₃、Na₂O、K₂O和P₂O₅迁出。岩相学观察、显微测温以及单个包裹体成分激光拉曼分析提示其流体包裹体类型主要为气液两相包裹体和含CO₂三相包裹体,具有低盐度（w（NaCl）为5.33%~13.29%）和中温（260~300℃）CO₂-NaCl-H₂O体系,在成矿过程中,含矿流体经历了流体不混溶作用。结合矿床地质特征及实验结果分析,确定该矿床为受陡崖断裂带控制的中温蚀变岩型金矿床。     

莱芜张家洼铁矿磁铁矿LA-ICP-MS微量元素特征及其对成矿过程的制约

莱芜张家洼铁矿位于华北克拉通东缘的鲁西地区,矿石成因类型为夕卡岩型铁矿。矿体赋存在早白垩世高镁闪长岩与奥陶系马家沟组灰岩及白云岩接触带附近。本文通过对莱芜岩浆和热液磁铁矿电子探针(EPMA)以及激光剥蚀电感耦合等离子体质谱(LA ICP MS)分析,探讨磁铁矿微量元素组成及变化规律对成岩和成矿作用的指示,为揭示张家洼铁矿的矿床成因及其成矿流体演化过程提供重要制约。分析结果表明,莱芜岩浆磁铁矿与热液磁铁矿相比明显富集Ti、V、Cr等亲铁元素,相对富集Nb、Ta、Zr、Hf等高场强元素以及Sn、Ga、Ge、Sc等中等相容元素,Mg、Al、Mn、Zn、Co显著富集于热液磁铁矿中。Ti、V、Cr以及Mg、Al、Mn、Zn在岩浆和热液中具有不同的地球化学行为,Ti、V、Cr从熔体中进入磁铁矿主要受温度、分配系数以及fO2控制。Mg、Al、Mn、Zn主要受控于水岩反应和后期绿泥石+碳酸盐脉的交代,这些元素通过类质同象替换富集于热液磁铁矿中。Co在热液磁铁矿中除了受水岩相互作用和后期流体交代的影响外,硫化物的出现会导致Co含量急剧降低。Si、Ca、Na及Sr、Ba在岩浆和热液磁铁矿中的地球化学行为非常一致。Ti Ni/Cr图能够用于区分岩浆和热液磁铁矿,莱芜岩浆磁铁矿中Ti含量较高且Ni/Cr比值≤1,热液磁铁矿Ti含量较低且绝大多数Ni/Cr比值≥1。张家洼热液磁铁矿可分为早、晚两个阶段：早期阶段包括(1)早期原生粒状磁铁矿和(2)早期次生磁铁矿;晚期阶段包括(3)晚期原生磁铁矿和(4)晚期次生磁铁矿。原生磁铁矿具有典型的三联点结构特征;次生磁铁矿受后期热液交代影响表现为多空隙,通常呈不规则状、树枝状、骸晶以及交代残余结构。磁铁矿微量元素生动记录了成矿流体演化过程,从早期到晚期、从原生到次生都显示Mg、Al、Mn、Zn包括Co含量持续升高,表明成矿流体可能朝着富集这些微量元素的方向演化。后期流体的交代导致绿泥石蚀变为磁铁矿,连续水岩相互作用和后期流体的交代以及绿泥石直接蚀变是导致热液磁铁矿富集Mg、Al、Mn、Zn等元素的主要原因。热液磁铁矿晚期孔隙较为发育,孔隙度的增加促使更多的流体和磁铁矿发生反应。热液磁铁矿的微量元素不仅能够反映矿床形成的物理化学条件,而且可以反映围岩性质以及水岩相互作用过程。     

Chemistry of magnetite-apatite from albitite and carbonate-hosted Bhukia Gold Deposit,Rajasthan, western India – An IOCG-IOA analogue from Paleoproterozoic Aravalli Supergroup: Evidence from petrographic,LA-ICP-MS and EPMA studies

The Bhukia gold (+copper) deposit hosted by albitite and carbonates that occur within the Paleoproterozoic Aravalli-Delhi Fold Belt (ADFB) in western India consists of magnetite, graphite, apatite and tourmaline along with sulfide mineralization. Ubiquitous presence of magnetite and apatite in gold-sulfide association, alteration patterns and shear controlled mineralization suggest it to be IOCG (Iron-oxide copper gold) type deposits. The detailed mineral chemistry of magnetite and apatite are generated and interpreted in terms of their genetic significance, hydrothermal and magmatic origin vis-à-vis their affiliation with IOCG deposition. The data suggest that the magnetite has hydrothermal affiliation. The Ni/Cr ratio is greater than 1, which is explained by differences in solubility and mobility of Ni and Cr in hydrothermal fluids and is corroborated with other key evidences including that of wide ranging Mg concentration further supports a strong hydrothermal input that is envisaged for the deposition of magnetite. Concentration of vanadium in magnetite is generally <1000 ppm in case of barren hydrothermal occurrences while in the study area, it is relatively higher as it is attributed to the gold-sulfide-Cu mineralization. Ti vs Ni/Cr, Ni/(Cr+Mn) vs Ti+V, Ca+Al+Mn vs Ti+V and Al+Mn vs Ti+V variations are interpreted in terms of magnetite genesis. EPMA data suggests that apatite present in Bhukia is of fluorapatite variety with F content >1 wt% and F/Cl >1. Higher concentration of F and moderate Mn along with lower concentration of Cl attests their magmatic hydrothermal character and its derivation from meta-volcano sedimentary source. REE patterns obtained from LA-ICP-MS analysis suggest enrichment of LREE relative to MREE and HREE with negative Eu anomaly. Y/∑REE, La/Sm, Ce/Th and Eu/Eu¹ vs Ce/Ce¹ values of apatite is indicative of their origin in a highly oxidized environment. Presence of magnetite along with apatite is a common feature in IOCG-IOA (Iron-Oxide Apatite) association. Bhukia Gold Deposit has many similarities with Kiruna type Iron-Oxide Apatite (IOA) deposits particularly with respect to their similar tectonic setting, alteration patterns, mineral assemblages such as abundance of magnetite, apatite and presence of late stage sulfides based on EPMA and Laser ablation ICP-MS (LA-ICP-MS) studies. Lithological, petro-mineralogical and geochemical signatures of magnetite and apatite infer that the Bhukia is a possible IOCG-IOA type gold deposit typically associated with sulfides and graphite which may be used as petrogenetic indicators and pathfinders for exploration.     

Trace elements in magnetite as petrogenetic indicators

We have characterized the distribution of 25 trace elements in magnetite (Mg, Al, Si, P, Ca, Sc, Ti, V, Cr, Mn, Co, Ni, Cu, Zn, Ga, Ge, Y, Zr, Nb, Mo, Sn, Hf, Ta, W, and Pb), using laser ablation ICP-MS and electron microprobe, from a variety of magmatic and hydrothermal ore-forming environments and compared them with data from the literature. We propose a new multielement diagram, normalized to bulk continental crust, designed to emphasize the partitioning behavior of trace elements between magnetite, the melt/fluid, and co-crystallizing phases. The normalized pattern of magnetite reflects the composition of the melt/fluid, which in both magmatic and hydrothermal systems varies with temperature. Thus, it is possible to distinguish magnetite formed at different degrees of crystal fractionation in both silicate and sulfide melts. The crystallization of ilmenite or sulfide before magnetite is recorded as a marked depletion in Ti or Cu, respectively. The chemical signature of hydrothermal magnetite is distinct being depleted in elements that are relatively immobile during alteration and commonly enriched in elements that are highly incompatible into magnetite (e.g., Si and Ca). Magnetite formed from low-temperature fluids has the lowest overall abundance of trace elements due to their lower solubility. Chemical zonation of magnetite is rare but occurs in some hydrothermal deposits where laser mapping reveals oscillatory zoning, which records the changing conditions and composition of the fluid during magnetite growth. This new way of plotting all 25 trace elements on 1 diagram, normalized to bulk continental crust and elements in order of compatibility into magnetite, provides a tool to help understand the processes that control partitioning of a full suit of trace elements in magnetite and aid discrimination of magnetite formed in different environments. It has applications in both petrogenetic and provenance studies, such as in the exploration of ore deposits and in sedimentology.     

焦家金矿床水-岩反应过程及成矿流体组分变化规律

在野外和室内岩相学观察的基础上,详细剖析了蚀变-矿化时序,结合热力学数值模拟方法与定量结果,厘定了水- 岩反应过程中矿物的沉淀次序、流体组分的存在形式、迁移行为、浓度变化和矿物形成机制以及组分之间的化学反应,为 进一步研究水-岩反应与金矿化的关系奠定了基础。研究结果显示反应初期K+由流体带入围岩形成钾长石化,随着反应的 进行,H+浓度持续降低而Fe2+和Al3+含量升高,绢云母和石英大量沉淀,钾长石消失;反应后期各类硫化物开始沉淀,石英 持续沉淀贯穿整个反应过程。成矿流体中SO42-,HS-,Fe2+的含量对蚀变矿物组合影响很大;水-岩反应过程中硫酸盐 （SO42-） 减少生成等量的HS-并伴随着含三价铁矿物的沉淀,可能是焦家金矿床硫化物沉淀的一种重要机制。整个反应过程 中溶液pH值持续升高是原岩中Ca,K,Na,Mg等与溶液中H+发生交换反应的结果;同时pH值的升高也会降低金的溶解度 致使金沉淀。上述研究成果对于理解岩石中的矿物共生组合、生成顺序及蚀变分带的成因机制提供了新的依据。