Determination of the Trace Refractory Elements V, Nb and Ta in Environmental Samples by ICP-MS After Separation and Preconcentration with Nanometre-Sized Alumina Microcolumns Following Chemical Modification by Gallic Acid

Nanometre-sized alumina was chemically modified with gallic acid (GA) and used as a solid phase adsorption material for the determination of trace amounts of V, Nb and Ta in natural water, soil and stream sediment samples by inductively coupled plasma-mass spectrometry. The effects of pH, sample flow rate and volume, elution solution and interfering ions on the recovery of the analytes were investigated. The results showed that V, Nb and Ta could be adsorbed at pH 4.0 and recovered with 1 ml of 2.0 mol l^-1 HCl. Under optimised conditions, the adsorption capacity of GA-modified nanometre-sized Al₂O₃ was found to be 7.0, 8.9, 13.3 mg g^-1 for V, Nb and Ta, respectively. The limits of detection were as low as 0.25, 0.24 and 0.66 ng l^-1 for V, Nb and Ta, respectively with a concentration factor of fifty. The recovery of V, Nb and Ta for spiked water samples was between 85.7 and 116%. The developed method has also been applied to the determination of trace V, Nb and Ta in soil and stream sediment certified materials, and the determined values were in a good agreement with the certified values.     

Determination of Rare Earth Elements, Y, Th, Zr, Hf, Nb and Ta in Geological Reference Materials G-2, G-3, SCo-1 and WGB-1 by Sodium Peroxide Sintering and Inductively Coupled Plasma-Mass Spectrometry

Data are reported for rare earth elements (REE), Y, Th, Zr, Hf, Nb and Ta in four geological reference materials using sodium peroxide (Na₂O₂) sintering and inductively coupled plasma-mass spectrometry. The described procedure was used by students during their thesis work. A compilation of their reference material data acquired over one year of laboratory work demonstrates the ease and reliability of the method and the high reproducibility of the analytical results. Relative standard deviations of up to thirty six measurements of one reference material were lower than 5% for Y and the REE. Reproduciblities of Zr, Hf, Nb, Ta and Th were higher at between 5% and 10%, and can be attributed to the inhomogeneous distribution of zircon and other trace mineral phases and uncorrected drift effects. The concentration data are compared to reference and literature values and demonstrate that the procedure is also accurate. New data on G-3 show some systematic deviations from G-2, which are statistically significant.     

Determination of High Field Strength Elements, Rb, Sr, Mo, Sb, Cs, Tl and Bi at ng g−1 Levels in Geological Reference Materials by Magnetic Sector ICP-MS after HF/HClO4 High Pressure Digestion

Six low abundance rock reference materials (basalt BIR-1, dunite DTS-1, dolerite DNC-1, peridotite PCC-1, serpentine UB-N and basalt TAFAHI) have been analysed for high field strength elements (Zr, Nb, Hf, Ta, Th and U), Rb, Sr, Mo, Sb, Cs, Tl and Bi at ng g⁻¹ levels (in rock) by magnetic sector inductively coupled plasma-mass spectrometry after HF/HClO₄ high pressure decomposition. The adopted method uses only indium as an internal standard. Detection limits were found to be in the range of 0.08 to 16.2 pg ml⁻¹ in solution (equivalent to 0.08 to 16.2 ng g⁻¹ in rock). Our data for high field strength elements, Rb, Sr, Mo, Sb, Cs, Tl and Bi for the six selected low abundance geological reference materials show general agreement with previously published data. Our Ta values in DTS-1 and PCC-1 (1.3 and 0.5 ng g⁻¹) are lower than in previously published studies, providing smooth primitive mantle distribution patterns. Lower values were also found for Tl in BIR-1, DTS-1 and PCC-1 (2, 0.4 and 0.8 ng g⁻¹). Compared with quadrupole ICP-MS studies, the proposed magnetic sector ICP-MS method can generally provide better detection limits, so that the measurement of high field strength elements, Rb, Sr, Mo, Sb, Cs, Tl and Bi at ng g⁻¹ levels can be achieved without pre-concentration, ion exchange separation or other specialised techniques.     

Significance of Nb/Ta as an indicator of geochemical processes in the crust-mantle system

A mantle value of 17.5 for Nb/Ta appears well established; less well established are crustal values of 11–12, although it appears that Nb/Ta for crustal-derived melts is less than mantle Nb/Ta, demonstrating fractionation of these two elements during crustal evolution, and suggesting that Nb/Ta variation may be indicative of a particular chemical process within the crust-mantle system.

Experimental studies on silicate and carbonatitic liquids at high pressure indicate that, although silicate minerals such as garnet, amphibole and clinopyroxene do fractionate Nb and Ta, the partition coefficients (D's) for both elements are very low. Thus involvement of these minerals may explain relatively small changes in Nb/Ta, but appears inadequate to explain the crust-mantle variation. However, high-quality data for Nb, Ta may be used to provide information on mantle melting or metasomatic processes (e.g., amphibole in the source region decreases Nb/Ta in derived melts, while carbonatitic metasomatism will increase Nb/Ta in affected mantle). Titanate minerals have high D's for Nb and Ta, and do fractionate these elements (e.g., D_Nb/D_Ta rutile/liquid of 0.5–0.8), and their involvement in crystal fractionation would increase Nb/Ta in derivative liquids. In contrast, D_Nb/D_Ta for rutile/fluid is 1.25, so that rocks affected by fluid equilibrated with residual rutile will show a decrease in Nb/Ta

Some Archaean gneisses appear to have high Nb/Ta, and may be a complementary component to that part of the crust which has a relatively low Nb/Ta, such as crustal-derived magmas (e.g., A- ad I-type granites and silicic volcanics). Within the crustal system pegmatites are known to have extremely high and variable Nb, Ta contents, often with low Nb/Ta. A fluid is generally considered to be involved in the generation of these rocks. Thus it is possible that fluid/melt partitioning may be the key to fractionating Nb and Ta, with preference for Ta in the fluid, and enrichment of Ta relative to Nb into the mid-upper crustal system, as the crust evolved, through upward movement of fluid.     

K比例H点标准加入吸光光度法同时测定矿样中铌和钽

从样品分解方法入手,探讨了最佳测试条件。用盐酸-氟化氢铵-硝酸-高氯酸溶解试样,在10%的盐酸介质中,用火焰原子吸收光谱仪于波长328.1 nm处,以空气-乙炔火焰测定铅精粉中的银量,克服了用铅析或灰吹法测定的步骤冗长等缺点。用铅精粉国家一级标准物质GBW 07167分析验证,测定结果与标准值吻合。方法精密度(RSD,n=12)为2.2%~4.3%,方法检出限为1.2μg/g。方法分析快速,简单。     

辽宁大石桥早白垩世建一岩体年代学、地球化学及成因研究

建一岩体岩性主要为花岗闪长岩.岩石中的锆石呈自形,发育岩浆振荡生长环带,具有较高的Th/U比值（>0.1）,均暗示其为典型的岩浆成因锆石.锆石LA-ICP-MS U-Pb定年结果显示,所测锆石²⁰⁶Pb/²³⁸U年龄集中于138~145 Ma,其加权平均年龄为140 Ma,说明花岗闪长岩的形成时代为早白垩世.主量元素特征显示,该岩体为铝不饱和的I型花岗岩.球粒陨石标准化稀土元素分配模式显示轻稀土元素（LREE）相对富集,中稀土和重稀土元素（MREE和HREE）相对亏损,具有轻微的负Eu异常,暗示岩浆演化过程中角闪石分离结晶明显而斜长石分离结晶较弱.微量元素蛛网图显示富集大离子亲石元素（LILE）Rb、Th、U,贫高场强元素（HFSE）Nb、Ta,其Nb/Ta、La/Nb和Th/Nb比值介于地壳和地幔平均值之间,显示建一岩体岩浆具有壳幔混源的特点.结合建一岩体岩石地球化学特点和区域构造背景,认为该岩体的形成可能与古太平洋板块向欧亚大陆下俯冲引起的类似于弧后盆地的伸展环境有关.     

A Simple Method for Precise Determination of 23 Trace Elements in Granitic Rocks by ICP-MS after Lithium Tetraborate Fusion

Abstract. An improved alkali fusion method followed by HF-HNO₃-HC1O₄ treatment is performed for simultaneous determination of 23 trace elements (Sr, Y, Zr, Nb, Ba, Hf, Ta, Th, U, and REE) by ICP-MS in rock reference materials: basaltic rocks (JB-2, JB-3) and granitic rocks (JG-la, JG-2, JG-3). Our improved method offers several advantages including: (1) suppression of whitish precipitates probably composed of insoluble fluorides by addition of HCIO4, (2) simple and reliable preparation procedure, (3) instrument calibration which enables straightforward simultaneous multi-elemental analysis, and (4) the very low background levels by using pure lithium tetraborate flux. We obtained the analytical results with a reproducibility of mostly <2 % (1) for the basaltic rocks and <7 % for the granitic rocks. The higher relative standard deviation (RSD) values for granitic rocks may be attributed to sample heterogeneity of coarse-grained granitic rocks. The analytical results of the granitic rocks demonstrate that Zr and Hf abundances are consistent with the compiled values and that REE concentrations agree well with recently published data, suggesting that the Li₂B₄O₇ fusion method applied in the present study is suitable for the analysis of the granitic rocks.     

THE GEOCHEMISTRY OF TANTALUM AND NIOBIUM

Ta and Nb are associated in nature. Both are oxyphile and are related geochemically to Fe, Mn, Ti, rare earths U, Th, Zr, W, Sn, Bi, and Sb. Both accompany the alkali metals,especially Na and Li. Their close relationship explains their isomorphism in mineral-forming processes. Zr, W, and Sn entrain Ta and Nb in the crystal lattices of their minerals in limited amounts. The concentration of Ta and Nb increases in the course of magma evolution from ultrabasic to alkalic. Nb predominates over Ta in the main kinds of rocks by from 5:1 to 17:1. Only in granite pegmatites is Ta dominant. In granitic rocks Ta and Nb are associated with Fe, Mn, Bi, Sb, W, and Sn. In granosyenitic complexes they form complex minerals with Ti, rare earths of the Y subgroup, U, and Th. Concentrations of Ta and Nb in granitic and granosyenitic complexes increase toward the end of the magmatic and pegmatitic processes, and afterward diminish toward the end of the pneumatolytic-hydrothermal processes. In alkalic complexes Ta and Nb are associated with Ti, rare earths of the Ce group, and Th. Concentrations of Ta and Ni in alkalic massifs are caused by magmatic differentiation. In alkalic ultrabasic complexes, in magmatic and pegmatitic processes, Ta and Nb do not form independent minerals but enter into minerals of Ti and Fe, i. e. perovskite, titanomagnitite, and pyroxenes. --M. Russell.     

超高压榴辉岩金红石中高场强元素变化的控制因素及其地球动力学意义

利用LA-ICP-MS对CCSD-MH超高压榴辉岩中金红石进行了详细的原位微区微量元素组成分析.金红石中高场强元素Nb和Ta含量主要受全岩Nb、Ta和TiO₂含量控制, Zr、Hf含量比较稳定基本不受全岩含量影响.粒间金红石中, 同一颗粒金红石核部Zr含量系统高于边部, 而边部则出现了明显的Pb和Sr富集特征.CCSD-MH榴辉岩中金红石与全岩的Nb/Ta比值呈现明显的不一致性.全岩Nb/Ta比值明显低于金红石且与全岩TiO₂含量负相关, 而金红石的Nb/Ta比值与全岩Nb、Ta含量和Nb/Ta比值没有明显的相关关系.金红石和全岩之间非完全耦合的Nb/Ta组成表明, 金红石并非形成于原岩的结晶过程中而是在超高压变质作用过程中形成, 尽管金红石是榴辉岩中Nb、Ta含量的主要载体矿物, 但金红石的Nb/Ta比值并不一定能完全代表全岩的特征, 而与全岩Nb、Ta和TiO₂的含量有关.粒间金红石核部Zr含量所记录的温度与粒径之间具有明显的正相关性, 反映金红石中的Zr在其形成后没有封闭.粒间金红石所表现出的明显的边部富集Pb和Sr的特征, 反映了后期流体活动对金红石组成的影响.这些研究结果为金红石中Zr在高温下的扩散作用和后期流体活动的影响提供了重要证据, 这可能是利用金红石Zr含量地质温度计计算的苏鲁-大别榴辉岩变质温度(598~827℃) 偏低的主要原因.      

Geochemistry and Radioactive Potentiality of Um Naggat Apogranite, Central Eastern Desert, Egypt

Abstract: The northern part of Um Naggat granite massif (UNGM) has suffered extensive post-magmatic metasomatic reworking which results into the development of (Zr, Hf, Nb, Ta, U, Th, F)– and albite-enriched and greisenized apogranite body (UNAP) of 600 m thick, and more than 3 km in the strike length.
Albitization produced an enrichment in Zr (av. 2384 ppm), Hf (61), Nb (419), and U (43). The Th/U ratio ranges between 1. 33 and 1. 90. Extreme albitization (i. e. the albitite rock) is characterized by sharp decrease in the rare metals contents. However, extreme greisenization (i. e. endogreisen bodies) is characterized by a considerable enrichment in Zr (av. 5464 ppm), Hf (143), Nb (2329), Ta (152), U (66) and Th (178). The Th/U ratio ranges between 1. 57 and 3. 60. In contrast to extreme greisenization, it seems that extreme albitization does not apparently change the fluid pH and therefore poor amounts of rare metals are localized in the albitites.
It is suggested that the presence of Na⁺, H⁺ and F^- in the ore fluids was essential to stablize complexes of Zr, Hf, Nb, Ta, U, Th, and HREE during extraction and transportation. In contrast, contemporaneous decrease of temperature and increasing pH due to decreasing pressure are considered the essential factors for localization of disseminated mineralization of Zr and Nb in the apical parts of the UNAP. The enhanced uranium content in the alteration facies of UNAP coupled with the absence of significant uranium mineralization may indicate the metalliferous rather than mineralized nature for the UNAP. The high uranium contents are stabilized in refractory accessory minerals. However, with repect to Zr and Nb, the UNAP especially the albitized and greisen facies, can be categorized as a mineralized productive granite.     

Niobium and Tantalum Concentrations in NIST SRM 610 Revisited

Niobium and Ta concentrations in MPI‐DING and USGS (BCR‐2G, BHVO‐2G, BIR‐1G) silicate rock glasses and the NIST SRM 610–614 synthetic soda‐lime glasses were determined by 193 nm ArF excimer laser ablation and quadrupole ICP‐MS. Measured Nb and Ta values of MPI‐DING glasses were found to be consistently lower than the recommended values by about 15% and 25%, respectively, if calibration was undertaken using commonly accepted values of NIST SRM 610 given by Pearce et al. Analytical precision, as given by the 1 s relative standard deviation (% RSD) was less than 10% for Nb and Ta at concentrations higher than 0.1 μg g^?1. A significant negative correlation was found between logarithmic concentration and logarithmic RSD, with correlation coefficients of ‐0.94 for Nb and ‐0.96 for Ta. This trend indicates that the analytical precision follows counting statistics and thus most of the measurement uncertainty was analytical in origin and not due to chemical heterogeneities. Large differences between measured and expected Nb and Ta in glasses GOR128‐G and GOR132‐G are likely to have been caused by the high RSDs associated with their very low concentrations. However, this cannot explain the large differences between measured and expected Nb and Ta in other MPI‐DING glasses, since the differences are normally higher than RSD by a factor of 3. Count rates for Nb and Ta, normalised to Ca sensitivity, for the MPI‐DING, USGS and NIST SRM 612–614 glasses were used to construct calibration curves for determining NIST SRM 610 concentrations at crater diameters ranging from 16 (im to 60 μm. The excellent correlation between the Nb/Ca_1μgg‐1 signal (Nb represents the Nb signal intensity; Ca_{1μg g‐1} represents the Ca sensitivity) and Nb concentration, and between the Ta/Ca_{1μg g‐1} signal (where Ta represents the Ta signal intensity; Ca_{1μg g‐1} represents the Ca sensitivity) and Ta concentration (R²= 0.9992–1.00) in the various glass matrices suggests that matrix‐dependent fractionation for Nb, Ta and Ca was insignificant under the given instrumental conditions. The results confirm that calibration reference values of Nb and Ta in NIST SRM 610 given by Pearce et al. are about 16% and 28% lower, respectively. We thus propose a revision of the preferred value for Nb from 419.4 ± 57.6 μg g^?1 to 485 ± 5 μg g^?1 (1 s) and for Ta from 376.6 ± 77.6 μg g^?1 to 482 ± 4 μg g^?1 (Is) in NIST SRM 610. Using these revised values for external calibration, most of the determined average values of MPI‐DING, USGS and NIST SRM 612–614 reference glasses agree within 3% with the calculated means of reported reference values. Bulk analysis of NIST SRM 610 by standard additions using membrane desolvation ICP‐MS gave Nb = 479 ± 6 μg g^?1 (1 s) and Ta = 468 ± 7 μg g^?1 (1 s), which agree with the above revised values within 3%.     

Determination of Ge, As, Se and Te in Silicate Samples Using Isotope Dilution-Internal Standardisation Octopole Reaction Cell ICP-QMS by Normal Sample Nebulisation

A method for the determination of Ge, As, Se and Te in silicate samples using isotope dilution-internal standardisation (ID-IS) octopole reaction cell (ORC) ICP-QMS by normal sample nebulisation was developed. The method does not involve either hydride generation or ion exchange. Germanium, Se and Te were determined by isotope dilution (ID), and As was determined by ID-IS. A silicate sample with an added Ge-Se-Te spike was digested with an HF-HNO₃-HBr mixture, dried, re-dissolved with HF and the supernatant liquid was directly aspirated into an ORC-ICP-QMS instrument with He or H₂ gas. No matrix effects were observed down to a dilution factor (DF) of ∼ 70 for Ge, Se and Te and DF of ∼ 1000 for As, which resulted in 3s detection limits in silicates of 2, 1, 0.1 and 4 ng g⁻¹, respectively. Advantages of the method are the simple sample introduction as well as a capability of determining S, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta by ID-IS-ICP-QMS/SFMS from the same solution. Furthermore, the total sample solution consumption was only 0.253 ml with DF = 2000. Therefore, only a 0.13 mg test portion was required. To demonstrate the applicability of this technique, Ge, As, Se and Te in eight silicate reference materials were determined, as well as S, Ti, Zr, Nb, Mo, Sn, Sb, Hf and Ta in four carbonaceous chondrites.     

Characterisation of Memory Effects and Development of an Effective Wash Protocol for the Measurement of Petrogenetically Critical Trace Elements in Geological Samples by ICP-MS

High sensitivity and low detection limits would seem to make inductively coupled plasma-mass spectrometry (ICP-MS) an ideal analytical tool for determining low (sub-μg g^-1) concentrations of the rare earth elements (REE), Y, Zr, Nb, Hf, Ta, Sn, W, Mo, Th, and U in most mafic materials (e.g. Hall and Plant 1992). However, the generally "sticky" nature exhibited by most of the high field strength elements (HFSEs: Zr, Nb, Hf, Ta, Th and U) as well as Sn, W and Mo can result in spurious results due to memory effects transmitted between unknowns and calibration samples. This, in turn, can seriously compromise the sensitivity, accuracy, and precision of ICP-MS analyses for these elements in geological materials. Data resulting from analyses with poor accuracy and precision can lead to erroneous interpretation and misleading petrogenetic modelling. To resolve this problem, we propose an effective wash protocol for these critical trace elements.     

Preliminary Investigation into the Use of a High Resolution Inductively Coupled Plasma-Mass Spectrometer with Laser Ablation for Bulk Analysis of Geological Materials Fused with Li2B4O7

The paper presents preliminary results of the use of a high resolution double-focussing, magnetic sector inductively coupled plasma-mass spectrometer (HR-ICP-MS) with ultraviolet laser ablation (LA) for the bulk analysis of geological materials fused with Li₂B₄O₇. Detection limits are based on data from precision measurements of a fused SiO₂ sample of high purity, and sensitivity data (cps/μg g^-1) obtained on the Reference Material (RM) Syenite SY-2. For many trace elements, the detection limits are better than 0.05 μg g^-1 using a sample to flux weight ratio of 1:7.
Calibration curves, which are based entirely on RMs, are established for Hf, Ta, Tb, Tm and Lu. They indicate that, even at this early stage in the development of the technique, data accurate to ˜ 25% can be collected. It is concluded that the method may prove to be a valuable supplement to XRF for low level element concentration measurements; it is also very practical, as the same sample discs can be used for both XRF and LA-ICP-MS analyses.     

APPLICATION OF THE ICP-MS TECHNIQUE TO TRACE ELEMENT ANALYSIS OF PERIDOTITES AND THEIR MINERALS

Inductively coupled plasma mass spectrometry (ICP-MS) has been applied to the determination of Rb, Sr, Ba, Zr, Hf, Nb, Ta, Th, U, Pb, Sc and 14 REE in peridotites and their constituent minerals: garnet, clinopyroxene, orthopyroxene and olivine. Determination limits for most elements are 1–10 ppb (in the solid sample), with accuracy and precision comparable to those of thermal ionisation and spark-source mass spectrometry. New data on international standards PCC-1, DTS-1, UB-N and JP-1 are reported.     

大兴安岭北部伊列克得组玄武岩的地球化学特征

大兴安岭北部伊列克得组玄岩类具有富碱（Ｋ２Ｏ＋Ｎａ２Ｏ〉６．３７％）、高Ｋ２Ｏ（２．６２％～３．１１％）,高Ｋ２Ｏ／Ｎａ２Ｏ比值（０．７～０．８）和Ｔｈ／Ｔａ、Ｃｅ／Ｎｂ、Ｔａ／Ｎｂ比值,以及强烈富集大离子亲石元素（ＬＩＬＥ）和轻稀土元素（ＬＲＥＥ）的特征,属于钾玄质系列,低Ｓｒ／Ｎｄ比值（１３～１７．５）的特征类似于洋岛玄武岩,但其Ｔａ／Ｈｆ,Ｔｈ／Ｔａ比值特征及与Ａ型花岗岩共生等特征表明,钾玄     

四川小金-理县一带铌钽矿成矿预测研究

四川小金-理县一带发育有燕山期和印支期两期花岗岩,存在稀有金属化探异常,已发现多处稀有金属矿(化)点,具有较好的铌钽成矿地质条件.该区内Nb、Ta具有印支期和燕山期两期成矿模式,前者富Ta,后者富Nb.岩体化学成分上以富碱为特征,Nb、Ta与Ti、Na、K相关性较好.通过对区域地质、区域地球物理、地球化学特征和已知矿床矿点的对比,研究了含矿岩体的岩石化学、岩石地球化学特征.在此基础上划分出4个铌钽找矿远景区,预测了资源远景储量(334)为Ta2O5 200～500t,Nb2O5 300～600t.     

Concentrations of Trace Elements in Carbonate Reference Materials Coral JCp-1 and Giant Clam JCt-1 by Inductively Coupled Plasma-Mass Spectrometry

Trace elements in the Geological Survey of Japan carbonate reference materials Coral JCp-1 and Giant Clam JCt-1 were determined by inductively coupled plasma-mass spectrometry after digestion with 2% v/v HNO₃. A standard addition method was adopted in this determination in order to neutralise the Ca matrix effect. In addition, Sc, Y, In and Bi were used as internal standards to control the matrix effect and correct instrumental drift. Of the eighteen elements measured in JCp-1, precisions for fourteen elements, including Cu, Cd and Ba, were better than 10% RSD and concentrations ranged from 0.002 μg g^-1 (Cs) to 8.02 μg g^-1 (Ba). The concentrations of measured trace elements in JCt-1, except for Cu, were lower than those in JCp-1. Precisions for all elements with concentrations higher than 0.04 μg g^-1 in JCt-1 were also better than 10% RSD and concentrations were found to be between 0.001 μg g^-1 (Cs) and 4.84 μg g^-1 (Ba). The concentrations of more than fifteen trace elements in the aragonite reference materials are reported here for the first time. Both reference materials are suitable for use in geochemical studies of environmental reconstruction based upon biogenic carbonate materials.     

吉林永吉大黑山钼矿寄主岩体地球化学特征及其成因

大黑山斑岩型钼矿花岗质岩体主要岩石类型为花岗闪长岩和花岗闪长斑岩,呈复式岩体状产出.含矿的花岗闪长斑岩体具有较高的Al₂O₃含量（A/CNK=1.04~1.25）,较低的Mg指数（Mg^#=21~44）;轻重稀土分馏明显,没有或具有轻微的负铕异常（δEu=0.82~1）,表明可能源区基本没有斜长石残留;富集大离子亲石元素Rb、Ba、Sr,相对亏损Nb、Ta、Y、Yb、Th、P和Ti,高Sr/Y、Sr/Yb比值,类似中国东部的“C型”埃达克岩.不含矿的花岗闪长岩A/CNK=1.01~1.03,轻稀土富集,重稀土亏损,中等的负铕异常（δEu=0.62~0.63）,富集大离子亲石元素Rb、Th元素,亏损Nb、Ta、Zr等高场强元素,强烈亏损P和Ti元素相,比较低的Sr/Y、Sr/Yb比值.Hf同位素特征显示,大黑山花岗质岩体是由中-新元古代亏损地幔中增生的新生地壳,在中生代发生熔融而形成的.结合太平洋板块构造演化史以及近年获得的黑龙江杂岩碎屑锆石年龄和黑龙江群蛇绿混杂岩中蓝片岩相变质作用的年龄,表明太平洋板块晚三叠世-早侏罗世开始向西俯冲,说明大黑山花岗质岩体的形成与太平洋板块俯冲有关.