低级变质岩在热液蚀变过程中的微量元素地球化学行为——以赣东北银山地区双桥山群为例

对江西银山地区双桥山群绢云母千枚岩及其原岩的稀土及微量元素的研究表明，热液蚀变过程中它们的地球化学行为十分复杂：热兴蚀变作用并不使REE淋滤降低，反而导致∑REE较其原岩普遍升高，但岩体接触带附近蚀为围岩的∑REE则低于原岩。蚀变岩出现Eu亏损，∑LREE／∑HREE值降低。定量计算显示，∑REE总升幅中有29％－45％是由围岩质量迁移引起的表观浓缩效应，而另外的55％－71％则是流体带入了REE；在绢云母千格岩中娟云母可能是REE的主要寄主矿物相，REE主要以吸附作用的形式固有在矿物的表面或含有可交换电价的晶体结构层（四面体层和八面体层）的层面上；参与蚀为变作用的热液∑LREE／∑HREE值低、Eu强正异常。流体REE的带入可能是造成蚀为围岩较原岩轻重稀土比值降低的主要因素。热液蚀变作用使岩石的Eu被还原成更易活动的Eu^2 而活化迁出，导致蚀变岩的Eu负异常更显著；围岩蚀变作用凌其聪等：低级变质岩在热液蚀为过程中的微量元素地球化学行为－－以赣 东银山地区双桥山群为例。     

大冶-武山矿化夕卡岩的稀土元素地球化学研究

用ICP-MS分析了25个含矿夕卡岩样品的REE含量,其中对8个样品的石榴子石等矿物中的熔融包裹体进行了均一温度测定,还对5个夕卡岩样品石榴子石中的熔融包裹体进行了电子探针分析.在这些样品的石榴子石、辉石或方解石中都观察到熔融包裹体.夕卡岩的球粒陨石标准化REE分布模式具有两个突出特点:其一是以富集轻稀土元素(LREE)右倾为特征;其二是多数以具有Eu正异常为特征.夕卡岩球粒陨石标准化REE分布模式有三种类型:第一类型显示斜率不大的右倾直线;第二类型具有以Ce为峰值的折线的特征,即REE线段向上凸,在Ce处有一极大值(个别无峰值,LREE曲线向上凸,呈穹隆状);第三类型为过渡型REE分布模式.在当今REE资料有限的情况下,利用稀土元素地球化学特点鉴别夕卡岩成因是困难的.     

银山矿床成矿作用微量元素地球化学研究

对银山矿床中矿石，岩体和矿体的蚀变围岩及其原岩的稀土及微量元素特征研究表明，热液蚀变作用导致蚀变岩的∑REE普遍升高，而近岩体∑REE则稍低于原岩，蚀变围岩出现Eu亏损，ω（LREE）／ω（HREE）值亦较原岩低，定量计算表明，∑ω（REE）总升幅中有31％下是由围岩质量迁移引起的表观浓缩现象，而另外的69％以上的效应则因流体带入了REE所致，热液具有ω（LREE）／ω（HREE）值低，强Eu正异常的特征，热液的还原性质促使Eu^3 还原为Eu^2 而被活化迁出，导致围岩的Eu负异常扩大；Sr普遍地比原岩降低，Ba普遍显著地升高，而Rb则相对稳定，:Hf,Rh,U,V,Cr,Co,Mo,Ra,Zr表现为不活动或弱活动性，成矿元素Cu,Pb,Zn,Ag Sn等被大量带入，Y，Sc被活化迁出。     

浪都夕卡岩型铜矿床中石榴子石稀土元素地球化学研究

文中对浪都矿床夕卡岩中石榴子石进行了主量和稀土元素研究。分析结果表明研究区石榴子石为钙铁榴石-钙铝榴石固溶体系列,成分变化于Ad_(87)Gr_(13)-Ad_(92)Gr_8之间,以钙铁榴石为主。与世界上很多夕卡岩矿床中石榴子石REE配分模式截然不同,研究区石榴子石稀土元素总量较低、配分模式表现为轻稀土富集,重稀土亏损,并且具有明显的Eu正异常。研究显示,浪都矿床钙铁榴石是在水/岩比值较高的环境下快速形成,其与流体之间并没有完全达到REE平衡。岩浆热液中REE的配分模式、表面吸附可能为制约石榴子石REE含量及配分模式的主要因素。Eu~(2+)(r=1.25 A)与其他REE~(3+)相比具有更大的离子半径,更容易被吸附在石榴子石晶体表面,可能是形成浪都矿床中石榴子石Eu正异常的主要原因。     

贵州天桥铅锌矿床地球化学特征及其地质意义

通过对天桥铅锌矿床常量元素、稀土元素、同位素及微量元素等地球化学特征的分析,研究了天桥铅锌矿床的成矿物质流体来源及成矿过程。研究结果表明：（1）矿石、围岩等的稀土元素组成特点相似。∑REE相对较低,LREE/HREE比值较大,稀土配分曲线呈富轻稀土的右倾型曲线。Eu负异常明显,Ce具弱负异常特征。（2）矿床成矿物质流体多来源。受陆源影响较大,主要来自上地壳,且可能主要来自赋矿地层及围岩;无大洋地壳和原始地幔来源。（3）成矿作用为热液改造成矿。     

赣东北朱溪超大型钨矿床中白钨矿的稀土、微量元素地球化学特征及其Sm-Nd定年

赣东北朱溪超大型钨矿床是目前世界上最大的夕卡岩型钨矿床,为确定其成矿物质来源及成矿时代,在详细钻孔岩心编录基础上,本文对白钨矿运用LA-ICP-MS法分析了其单矿物的微量元素、稀土元素,并进行Sm-Nd同位素定年研究。结果显示:白钨矿微量元素中Mo、Nb、Ta富集,而Rb/Sr0.04,Nb/Ta=1.69~8.46、Zr/Hf=3.06~6.75,显示成矿物质的壳源特征。白钨矿的∑REE变化大(∑REE=3.25×10~(-6)~229.95×10~(-6)),LREE与HREE之间分馏明显((La/Yb)N=36~19 984),属于轻稀土富集型。依据δEu值的特征,将白钨矿分为δEu正异常(δEu=1.44~9.06)的轻稀土富集型和δEu负异常(δEu=-0.25~-0.82)的轻稀土富集型;在空间上,由远到近接近花岗岩,白钨矿的∑REE逐渐升高,δEu由正异常逐渐转变为负异常,有与花岗岩稀土配分曲线趋于一致的趋势。白钨矿Sm-Nd等时线年龄为(144±5)Ma,143 Nd/144 Nd初始比值为0.512 020,其εNd(t)为-9.753,二阶段模式年龄为1 745 Ma,其年龄与物质来源与朱溪花岗岩的一致,表明朱溪钨矿床是朱溪矿区隐伏花岗岩进一步演化的产物。     

冬瓜山层控夕卡岩型铜矿床成矿流体特征及其成因意义

对冬瓜山层控夕卡岩型铜矿床的矿物流体包裹体进行了深入研究。结果显示，主成矿阶段流体的温度高达350－400℃，成矿流体是一种高温（350－400℃），高率（ω（NaCl)=13.45%-48%)，高密度（大于1.1g/cm^3)的流体。其中的稀土元素具轻稀土富集，Eu呈显著负异常，轻重稀土分异明显的特征。由于其特殊的成矿环境，流体的输运过程是一种近于等温的过程。成矿作用发生于偏酸性且较还原的条件下。成矿流体由岩浆源和地层共同提供，是一个典型多源成矿物质，多成矿阶段，多控矿因素的层控夕卡岩型矿床。     

云南个旧塘子凹锡多金属矿床夕卡岩地质地球化学特征

从地质产状、矿物组合和岩石化学成分等方面探讨了个旧塘子凹接触带不同类型夕卡岩的特征。该夕卡岩带从内侧到外侧常具有辉石夕卡岩带和石榴子石夕卡岩带交替出现的现象，其岩石化学成分也相应地发生韵律变化，表现为在辉石夕卡岩带中SiO2和MgO含量较高，而在石榴子石夕卡岩带中CaO、TFe和Al2O3含量较高。认为夕卡岩带中的韵律变化一方面与被交代围岩中存在灰质白云岩和大理岩的互层带有关，另一方面与岩浆期后热液的渗滤交代作用有关。围岩中的灰质白云岩层被交代后形成辉石带，大理岩层被交代后形成石榴子石带。     

铜陵东狮子山铜矿床地质特征及成岩成矿机理研究

铜陵东狮子山铜矿为一夕卡岩矿床,但与常见的夕卡岩矿床明显不同。在产状方面,夕卡岩与围岩（大理岩）界线截然,围岩出现重结晶褪色边,夕卡岩边缘有淬火边,与夕卡岩相接触的辉石二长闪长岩出现烘烤褪色边,夕卡岩中出现辉石二长闪长岩角砾;在矿物组成上,具特殊的钾长石＋方解石＋石英囊状体,其内矿物边界规则,无分带现象,夕卡岩矿物无被交代现象;在结构构造方面出现特征的海绵陨铁结构、豆状构造、流动构造等;在地球化学方面,夕卡岩岩石的微量元素、稀土元素特征与辉石二长闪长岩相似,其中呈填隙状方解石的化学组成、同位素组成显示深源特征;夕卡岩矿物中出现熔融包裹体,均一温度高于９２０℃;矿体特征与寄主夕卡岩的各方面特征十分相似。这些特征显示该矿床可能是一种高温高密度粘稠的夕卡岩岩浆熔（流）体冷凝结晶演化过程的产物。     

新疆北部喇嘛苏铜矿区有关岩石的稀土元素地球化学

新疆北部的喇嘛苏铜矿是一个较典型的夕卡岩型矿床，通过对该矿区内不同类型岩石的稀土元素地球化学研究，建立了各类岩石的REE分布模式，探讨了矿区内中酸性浅成岩、碳酸盐岩、夕卡岩、基性岩脉等4种主要岩石类型的稀土元素地球化学行为，认为该矿区内不同类型的岩石具有REE分布型式相近，具清晰的Eu负异常及弱Ce负异常、w(La)n/W(Sm)n值普遍高于W(Gd)n/W(Yb)n值等共性，相比之下浅成岩具有较低的W(La)n/（wYb)n值与变化范围偏宽的δ（Eu)值，碳酸盐岩具有较高的W(La)n/W(Yb)n值与变化范围偏窄的δ（Eu）值，夕卡岩的W(La)n/w(Yb)n值与δ（Eu)值变化范围刚好居于这二者之间，中酸性浅成岩有随着SiO2质量分数增高而δ（Eu)值降低的趋势。     

Geochemical Behaviors of REE and Other Trace Elements during the Formation of Strata-bound Skarns and Related Deposits: A Case Study of the Dongguashan Cu (Au) Deposit, Anhui Province, China

REE and other trace elements in the altered marbles, massive skarns and ores, as well as garnet and quartz were determined in order to examine the behaviors of trace elements during hydrothermal alteration. It is demonstrated that the high-field-strength (HFS) elements Zr, Hf, Th and Nb were immobile while other trace elements were mobile during the formation of skarns and related deposits. REE and ore-forming elements such as Cu and Ag in hydrothermally-altered marbles and skarns were provided primarily by hydrothermal fluids. In the direction transverse of the strata, the more deeply the marbles were altered, the higher the total REE abundance and the larger the negative Eu anomalies would be. The chondrite-normalized REE patterns of skarns are similar to those of the marbles, but the former are distinguished by much higher REE contents and more remarkable negative Eu anomalies. Those patterns were apparently not inherited from the marble protolith, but were controlled by garnets, which were determine     

江西永平铜矿矽卡岩矿物特征及其地质意义

永平铜矿含矿岩石主要为绿帘石透辉石石榴石矽卡岩,这种岩石类型是与斑岩体有关的矽卡岩铜矿的典型赋矿岩石。通过对这一主要赋矿矽卡岩的研究,我们发现石榴石生长分为两个阶段:(1)早期石榴石:主要分布在石榴石颗粒核部,XAdr=1.0,主要以钙铁榴石为主,说明早期流体中可能含有较多的铁,是在较氧化条件下形成的;(2)晚期石榴石,沿石榴石裂隙重新成核或者在靠近流体通道的早期石榴石表面生长,出现震荡环带,XAdr=0.46~0.99,为钙铁-钙铝石榴石系列。石榴石发生变化的期间也形成新的矿物,如绿帘石、萤石、方解石和石英等。共存石榴石和绿帘石矿物中存在Fe3+-Al3+之间的替代,说明流体的氧逸度、组分浓度或aFe3+/aAl3+可能发生了变化。金属矿物也可能是在这一阶段形成的。永平铜矿矽卡岩从接触带到大理岩空间上有分带现象。从岩体到围岩的变化趋势为:石榴石含量减少,颜色存在红棕色-棕色-棕绿色-黄绿色-浅黄色的变化趋势;矿石品位降低,这与石榴石中Al2O3含量的变化较一致。我们认为这种变化是含矿热液对早期矽卡岩进行再交代改造的结果,表现为石榴石和绿帘石中Fe3+-Al3+含量的变化,并将Cu等金属沉淀下来。根据矽卡岩矿物的这些特征,在矿床勘探时,可依据棕色石榴石来追踪主矿体的位置。     

Active skarn formation beneath Lascar Volcano, northern Chile: a petrographic and geochemical study of xenoliths in eruption products

Calcsilicate xenoliths occur in large numbers in some lavas and pyroclastic flows of Lascar Volcano. Their whole-rock major element and REE compositions indicate that the protolith was the Upper Cretaceous Yacoraite Formation, which crops out extensively in NW Argentina. The whole-rock major element compositions of the xenoliths fall into specific groups suggesting a strong geochemical zonation in the skarn zone. Three geochemical zones have been identified; (1) an outer metamorphic zone rich in wollastonite; (2) a middle zone rich in pyroxene and garnet; (3) an inner zone rich in pyroxene and magnetite. The two innermost zones have developed from the wollastonite zone by infiltration of metasomatic fluids rich in Fe, Mn, Mg, Ti and Al. Whole-rock REE patterns have not changed significantly during prograde metamorphism and metasomatism, indicating REE immobility in the altering fluids. Retrograde alteration by acid-sulphate fluids produced anhydrite skarns and secondary calcite and wilkeite veins in the wollastonite zone. The carbon and oxygen isotopic compositions of this calcite indicate that it formed by Rayleigh crystallization from a low-temperature (<200 °C) fluid containing dissolved H₂CO₃. The calculated δ¹⁸O of the water in this fluid suggests a magmatic origin whereas the calculated δ¹³C of the dissolved carbonate is consistent with derivation from rocks of the Yacoraite Formation at 350 °C. It is suggested that the magmatic acid-sulphate fluid was responsible for leaching carbonate from the surrounding carbonate rocks and redepositing it in the skarn zone. REEs were mobilized during the retrograde acid-sulphate and acid-carbonate alteration. A negative Ce anomaly associated with this carbonate and sulphate indicates high oxygen fugacities in the mineralizing fluids.     

新疆蒙库铁矿床稀土元素地球化学及对铁成矿作用的指示

新疆富蕴县蒙库大型铁矿呈层状、似层状、透镜状赋存于下泥盆统康布铁堡组变质火山-沉积岩系中.矿体中发育矽卡岩,但矽卡岩并不产在侵入岩接触带上.绿帘石、石榴石和矿石的稀土配分模式具有相似性,均为轻稀土富集,正铕异常,基本上无铈异常,暗示它们之间存在成因联系.石榴石稀土配分模式呈折线型,具有明显的正铕异常,石榴石流体包裹体中熔融包裹体、熔流包裹体和气液包裹体共存,表明石榴石矽卡岩具有岩浆成因和热液成因的特征,形成于晶体 熔体 流体三相共存的岩浆-热液过渡阶段.矿床地质特征、矽卡岩矿物和矿石稀土特征表明蒙库铁矿为矽卡岩型矿床.     

Mineral geochemistry of the Sangan skarn deposit,NE Iran: Implication for the evolution of hydrothermal fluid

The Sangan iron skarn deposit is located in the Sabzevar-Dorouneh Magmatic Belt of northeastern Iran. The skarn contains zoned garnet, clinopyroxene and magnetite. Cores and rims of zoned garnets are generally homogeneous, having a relatively high ΣREE, low ΣLREE/ΣHREE ratios, and positive Eu anomalies. The cores of the zoned clinopyroxenes are exceptionally HREE-rich, with relatively high ΣREE and HREE/LREE ratios, as well as positive Eu anomalies. Clinopyroxene rims are LREE-rich, with relatively low ΣREE contents and HREE/LREE ratios, and do not have Eu anomalies. Magnetite grains are enriched in LREEs in comparison with the HREEs and lack Eu anomalies. Variations of fluid composition and physicochemical conditions rather than YAG-type substitution mechanism are considered to have major control on incorporating trace elements, including REE, into the skarn mineral assemblage. Based on baro-acoustic decrepitation analysis, the calc-silicate and magnetite dominant stages were formed at similar temperatures, around 350–400 °C. In the Sangan skarns, hydrothermal fluids shifted from near-neutral pH, reduced conditions with relatively high ΣREE, low LREE/HREE ratios, and U-rich characteristics towards acidic, oxidized conditions with relatively low ΣREE, high LREE/HREE ratios, and U-poor characteristics.     

Mary Kathleen metamorphic‐hydrothermal uranium — rare‐earth element deposit: Ore genesis and numerical model of coupled deformation and fluid flow

The Mary Kathleen U‐REE orebody of the Proterozoic Mt Isa Block was the product of chemical and physical interaction between regional metamorphic/hydrothermal fluids and preexisting calcic skarns. The deposit provides excellent examples of mechanical control on ore localisation and of the complexity of ores in rocks with protracted thermal histories. Host skarns were produced by contact metasomatism around the 1740 Ma Burstall Granite, whereas the allanite‐uraninite ore formed under amphibolite‐facies conditions, late during the D₂ phase of the ca 1550–1500 Ma Isan orogeny. Observations of ore geometry are consistent with previous geochronologic data demonstrating a large time gap between skarn formation and ore genesis. Numerical modelling of coupled deformation and fluid flow suggests that veins at the core of ore shoots may have formed as tensile or shear fractures during coupling of the competent skarn host with the late‐D₂ Mary Kathleen Shear Zone, allowing a change of orientation of ore shoots with distance from the shear zone. Mineral chemistry and petrographic observations suggest the possible role of a redox control on chemical localisation of ore by conversion of Fe²⁺‐rich clinopyroxene‐rich skarn host to Fe³⁺‐rich secondary garnet ‘skarn’ and uraninite‐allanite ore. Alternately, fluid pressure drops as a consequence of fracturing of the host skarn may have triggered fluid unmixing, or fluid mixing, leading to ore precipitation. Available data do not allow clear definition of the ultimate source of the U and REE, nor of the specific chemical ore‐forming mechanism. However, regional constraints, previous Sm–Nd modelling, and our numerical models suggest a combination from proximal skarn hosts and from distal sources accessed by flow of metamorphic and/or late tectonic igneous‐derived fluids. The deposit has some similarities with ironstone‐hosted Cu–Au ± U deposits found in the nearby Cloncurry Belt.     

Rare Earth Elements as an Indicator to Origins of Skarn Deposits: Examples of the Kamioka Zn-Pb and Yoshiwara-Sannotake Cu(–Fe) Deposits in Japan

Abstract: Systematic data of rare earth elements (REEs) are presented in order to put some constraints on the origin of hydrothermal fluids responsible for two contrastive skarn deposits in Japan; the Kamioka Zn-Pb and Yoshiwara-Sannotake Cu(-Fe) deposits. Carbon and oxygen isotopic studies have demonstrated that the hydrothermal fluids responsible for the Kamioka Zn-Pb deposits are of meteoric water origin whereas those for the Yoshiwara-Sannotake Cu(-Fe) deposits are of magmatic water origin. The REE abundances of epidote skarn derived from aluminous rocks, garnet and clinopyroxene in calcic exoskarn derived from limestone, and interstitial calcite associated with sulfide minerals were determined for these contrastive skarn deposits by inductively-coupled plasma mass spectrometry (ICP-MS). A significant difference in the REE concentrations is not found between epidote skarn and aluminous original rock (plagioclase-clinopyroxene rock, called Inishi rock) from the Kamioka Zn-Pb deposits, indicating that the REEs are generally immobile during the formation of epidote skarn, and that the REE concentrations of the hydrothermal fluid are considerably low relative to the aluminous original rock. In contrast, the epidote skarn exhibits enrichment of Eu with increasing total REE concentrations relative to the aluminous original rock (quartz diorite) in the Yoshiwara-Sannotake Cu(-Fe) deposits, implying a contribution of magmatic fluid derived from granitoids during the skarn formation. Limestone generally has much lower REE concentrations related to surrounding aluminous rocks, and thus the REE concentrations of garnet and clinopyroxene in calcic exoskarn, originated from limestone, are variable due to the interaction with the hydrothermal fluids. The chondrite-normalized REE patterns of garnet, clinopyroxene, and interstitial calcite exactly provide useful information on origins of hydrothermal fluids. The REE patterns of these minerals from the Kamioka Zn-Pb deposits show lower (Pr/Yb)cn ratios, and negative Ce and Eu anomalies inherited from limestone with the decrease of This suggests that the hydrothermal fluids responsible for the Kamioka Zn-Pb deposits were depleted in REEs, and were not magmatic water in origin, but presumably meteoric one. In striking contrast, the REE patterns of exoskarn minerals and calcite from the Yoshiwara-Sannotake Cu(-Fe) deposits exhibit a positive Eu anomaly, and high (Pr/Yb)cn ratios with the considerable increase of σREE and the disappearance of negative Ce anomaly, implying that the fluids were dominantly of magmatic origin. The REE indices are very likely to be an excellent indicator to origins of the skarn deposits.     

江西香炉山钨矿床矽卡岩矿物和成矿花岗岩地球化学特征及其指示意义

江西香炉山大型钨矿床位于长江中下游成矿带南侧新识别的钨矿带西段,为一矽卡岩型白钨矿床.矽卡岩矿体主要产于中寒武统杨柳岗组含炭质灰岩和香炉山花岗岩接触部位.香炉山花岗岩具有细粒至中粗粒结构,主要由石英、钾长石、斜长石和黑云母组成,副矿物以钛铁矿为主.香炉山花岗岩的SiO2含量为66.37％～67.76％,并具有较高的Na...     

Fluid metasomatic genesis of stratiform skarn in the Suoerkuduke Cu-Mo deposit,East Junggar,NW China

Stratiform skarns associated with ore deposits are widespread in the north of East Junggar, particularly in the Suoerkuduke Cu-Mo deposit. The Suoerkuduke stratiform and stratoid skarns are hosted by Devonian intermediate-mafic volcanic and pyroclastic rocks, mainly andesite, andesitic porphyry and tuffaceous sandstone, without carbonate or calcareous rocks. The skarns consist of dominant andradite-grossular, epidote, diopside-hedenbergite and minor actinolite, quartz, magnetite and metallic sulfides. The garnet and epidote composition, especially Fe^3 + and Al contents, is largely a function of the bulk composition and physicochemical environment (particularly fO₂) during crystallization. Such mineralogy indicates a relatively oxidizing environment and medium acidity of solution during skarnization.The Suoerkuduke skarns are distinct from typical contact metasomatic skarn in wall rock, as no carbonate or calcareous rocks were found, and differ in the distribution patterns of skarn zonation in that gradually weakened skarn zones are not quite symmetrically distributed on both sides of the alteration center (a garnet skarn). Abundant remnants of andesite, andesitic porphyry and tuffaceous sandstone in the weakened skarn zone indicate that the protolith of the skarn is andesite, andesitic porphyry and tuffaceous sandstone. Magmatic water, meteoric and seawater are involved in skarn alteration. Moyite and granitic porphyry are not coeval with skarn, and their emplacement resulted in the hornfelization of wall rock instead of skarnization, and themselves keep away from skarn alteration. Therefore, there was probably a huge batholith supplying magmatic fluid for skarn formation. Mass balance estimates suggest that hydrothermal fluid must contribute a portion of Ca and Fe to ensure sufficient supply for skarn formation in the absence of local carbonate and calcareous rocks. In conclusion, the stratiform skarns in the Suoerkuduke are products of intermediate-mafic volcanic and pyroclastic rocks metasomatised by hydrothermal fluid that probably leached calcareous wall rock during ascent.     

新疆雅满苏铁矿床矽卡岩和磁铁矿矿物学特征及其地质意义

雅满苏铁矿床位于东天山中段,矿体赋存于下石炭统雅满苏组安山质火山碎屑岩中,受近EW向断裂及环形断裂构造控制。矿体主要呈层状、似层状、透镜状,近矿围岩蚀变强烈,形成石榴石矽卡岩及复杂矽卡岩。电子探针分析结果表明,石榴石为钙铁榴石-钙铝榴石系列,其化学组成可表示为And45.68~100Gro0.67~57.95(A1m+Sps)11~29.03,与典型的矽卡岩型铁矿中石榴石端员组分相似。在磁铁矿Ca+Al+Mn-Ti+V图解中,大部分样品落入矽卡岩型铁矿区;TiO2-Al2O3-MgO图解中,大多数的样品落入沉积变质接触交代磁铁矿趋势区,部分早期磁铁矿落在岩浆趋势区内。结合矿床地质特征和矿物学研究,认为大多数样品经过了一个热液交代作用过程,表明雅满苏铁矿的形成与岩浆热液交代作用有关。