西昆仑笔架山富铷花岗斑岩的地球化学特征及成矿作用

余文昌; 刘超; 李斌

doi:10.12404/j.issn.1671-1815.2507246

科学技术与工程 ›› 2026, Vol. 26 ›› Issue (25) :10707-10716 DOI: 10.12404/j.issn.1671-1815.2507246

天文学、地球科学

西昆仑笔架山富铷花岗斑岩的地球化学特征及成矿作用

余文昌 ¹ ,
刘超 ² ,
李斌 ¹^,³^,^*

作者信息 +

Geochemistry of Rb-rich Granite Porphyry in Bijiashan Area, West Kunlun Orogen: Implications for Mineralization

YU Wen-chang ¹ ,
LIU Chao ² ,
LI Bin ¹^,³^,^*

Author information +

文章历史 +

摘要

笔架山富铷花岗斑岩体位于西昆仑造山带大红柳滩-泉水沟断裂构造南侧,岩体即是矿体,是新发现的超大型铷矿床。对该岩体开展系统年代学、岩石地球化学与矿物学研究,旨在探究笔架山铷矿床稀有金属成矿机制和岩石学成因。实验获得激光剥蚀电感耦合等离子体质谱(LA-ICP-MS)锆石U-Pb年龄为(5.88±0.06) Ma(MSWD = 2.2),确定岩体形成于上新世。笔架山花岗斑岩属于高硅、高钾钙碱性系列,稀土元素总量(ΣREE)为(131~202)×10^-6,轻稀土相对重稀土富集,呈右倾的稀土配分模式,显示出一定程度“四分组效应”及显著负Eu异常的特点,表明其具有纯壳源来源的高分异花岗岩特点。矿床中铷赋存于碱性长石和黑云母中,Rb⁺通过类质同象方式替代钾长石中的K⁺或进入黑云母和绢云母的层间结构中。云母中高F含量与Rb的富集呈显著正相关关系。笔架山铷矿床的形成主要受控于壳源高分异花岗岩浆的结晶分异作用与晚期富氟热液活动的叠加,早期岩浆分异促使铷在残余熔体中预富集,晚期流体作用则进一步导致铷超常富集,并最终以类质同象形式固定于碱性长石和云母类矿物中。

Abstract

The Bijiashan Rb-rich granitic porphyry is situated on the southern flank of the Dahongliutan-Quanshuigou fault in the West Kunlun orogenic belt. This intrusion directly forms the orebody, and this orebody represents a newly discovered superlarge rubidium deposit. Systematic geochronological, whole-rock geochemical, and mineralogical analyses on this intrusion were performed, aiming to clarify the petrogenesis of the Bijiashan porphyry and the rare-metal metallogenic mechanisms of the associated rubidium deposit. Zircon LA-ICP-MS U-Pb dating yielded an age of (5.88±0.06) Ma (MSWD = 2.2), thereby confirming its emplacement in the Pliocene. The Bijiashan granitic porphyry was characterized by high silica and high potassium content, belonging to the high-K calc-alkaline series. The rocks have total rare earth element (ΣREE) contents of (131-202) × 10^-6, with a composition marked by significant light rare earth element (LREE) enrichment and a right-sloping REE pattern. Notably, it exhibits a discernible “tetrad effect” and a significant negative Eu anomaly, suggesting that it is a highly fractionated granite of pure crustal derivation. Within the deposit, rubidium is primarily hosted in alkali feldspar and biotite. Rb⁺ isomorphously substitutes for K⁺ in K-feldspar or occupies the interlayer sites of biotite/sericite. High fluorine (F) content in mica exhibits a significant positive correlation with rubidium (Rb) enrichment. The formation of the Bijiashan Rb deposit was dominated by crystallization differentiation of a crust-derived, highly fractionated granitic magma, with subsequent overprinting by late-stage, fluorine-rich hydrothermal fluids. Early magmatic differentiation was responsible for the preconcentration of rubidium in the residual melt. This process was followed by further extreme enrichment through subsequent fluid activity, culminating in the final fixation of rubidium via isomorphism in alkali feldspar and sheet silicate host minerals.

Graphical abstract

关键词

西昆仑 / 笔架山 / 富铷花岗斑岩 / 锆石U-Pb定年 / 铷富集机制

Key words

West Kunlun / Bijiashan / Rb-rich granite porphyry / zircon U-Pb dating / rubidium enrichment mechanism

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余文昌, 刘超, 李斌. 西昆仑笔架山富铷花岗斑岩的地球化学特征及成矿作用[J]. 科学技术与工程, 2026, 26(25): 10707-10716 DOI:10.12404/j.issn.1671-1815.2507246

YU Wen-chang, LIU Chao, LI Bin. Geochemistry of Rb-rich Granite Porphyry in Bijiashan Area, West Kunlun Orogen: Implications for Mineralization[J]. Science Technology and Engineering, 2026, 26(25): 10707-10716 DOI:10.12404/j.issn.1671-1815.2507246

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铷(Rb)元素凭借优秀的光电性能,成为关键的战略性金属资源,在现代尖端科技与国防工业中扮演着不可替代的角色^[1-5],已成为全球地缘政治背景下大国博弈的焦点,被欧美等主要经济体列入关键矿产清单(USGS)^[6]。然而中国铷资源长期面临供应高度依赖进口的困境^[4,7-8]。目前,中国已知的铷矿床主要包括伟晶岩型、盐湖型、云英岩型及花岗岩型,其中花岗岩型铷矿床是最主要的矿床类型^[7,9]。对于花岗岩型铷矿床研究已形成较为系统的认识。大量研究表明,铷的富集不仅需要岩浆的高程度分异演化,更依赖于完整的热液过程。例如,吴昌志等^[8]对中亚造山带天河石铷矿床的研究强调了岩浆极端分异与强烈流体活动对铷富集的促进作用。Wu等^[10]通过模拟实验进一步指出,仅凭结晶分异难以使铷达到工业品位,而富挥发分流体参与对其成矿具有关键作用。Han等^[11]、Bai等^[12]对全球大型铷矿床的对比研究表明,资源储量丰富的铷矿床均经历了完整的岩浆结晶和岩浆-热液转换过程,才能实现铷的有效富集。

值得注意的是,这些花岗岩型矿床多形成于中生代,新生代成矿实例相对较少^[7]。新疆西昆仑地区作为中国重要的稀有金属成矿省,提供了可观的铷资源储量,展现出巨大的找矿潜力^[13]。西昆仑地区新生代以来,在印度-欧亚板块远程碰撞效应的持续影响下,发生了塔里木地块向西南的陆内俯冲与大规模走滑断裂活动,引起一系列富硅、富碱的岩浆活动^[14-16]。这些高度演化的岩浆体系与稀有金属的富集成矿具有密切联系^[17]。勘查结果显示,笔架山地区具有形成超大型铷矿床的优越前景,富铷花岗斑岩体的Rb₂O平均品位达0.177%,初步估算全区Rb₂O资源量高达约135万t^[13]。然而,当前对该成矿岩体的基础岩石学研究仍较为薄弱,特别是关于其精确成岩时代、铷的赋存状态与富集机制等关键科学问题尚不明确,严重制约了区域成矿规律的总结与找矿勘查的突破。证实西昆仑地区具备形成世界级稀有金属资源基地的潜力,对于打破国际资源壁垒、保障中国高新技术产业链的安全与自主可控具有深远的战略意义,推动资源优势向经济与战略优势的实质性转化^[18]。

为此,现选取西昆仑笔架山花岗斑岩铷矿床作为研究对象,通过开展系统的岩相学观察、锆石U-Pb定年、全岩地球化学、LA-ICP-MS矿物原位成分分析与电子探针成分分析等综合研究,旨在精确厘定含矿花岗斑岩的成岩、成矿时代,查明铷的主要赋存状态与载体矿物,探讨成矿物质来源与矿床成因机制。

1 地质背景

1.1 区域地质背景

研究区大地构造上属西藏-三江造山系巴颜喀拉地块的康西瓦-泉水沟前陆盆地,地处西昆仑-喀喇昆仑构造带东段,其构造格架受北西西向泉水沟-郭扎错深大断裂带主导[图1(a)]^[13]。区内出露地层自中新元古界至中-新生界均有发育^[19-20],总体呈北西向展布。断裂构造发育,构成以北西西向深大断裂为主干、伴生次级叠瓦状断裂的构造系统,为岩浆侵位与热液运移提供了关键通道^[21-22]。岩浆活动具有多期次特征,中生代以二长花岗岩、黑云母花岗岩等深成侵入岩为主^[22-25];新生代则广泛发育似斑状二长花岗斑岩、泉水沟花岗斑岩等浅成岩体^[25-28],并伴生有新近纪火山岩。频繁的构造-岩浆活动为成矿提供了优越条件,共同促成了西昆仑大红柳滩-泉水沟稀有金属矿集区的形成。区域成矿作用受北西向深大断裂与中-新生代高分异花岗岩的联合控制,构成一条以锂、铍、铷、铌、钽为主的重要稀有金属成矿带^[29-31]。

1.2 矿区地质背景

笔架山铷矿位于西昆仑大红柳滩-泉水沟稀有金属矿集区中部[图1(b)、图1(c)]。矿区地层序列完整,北部为中下二叠统黄羊岭组,岩性为灰色-深灰色硅质碎屑岩夹火山岩,具弧前盆地深水浊积特征;中部为上三叠统云雾岭群,以灰褐色中厚层细粒长石石英砂岩夹粉砂岩为主,表现为复理石建造特征;东部则零星覆盖中上新统泉水沟组灰黑色-砖红色玄武岩,与下伏地层呈角度不整合接触。构造上,矿区位于大红柳滩-泉水沟与郭扎错两大区域断裂所夹持的块体内,内部断裂构造不发育。区内共出露两处花岗斑岩岩株,西部岩体呈北西向展布,面积约2.03 km²,因冲积物覆盖而分为两处露头;东部岩体呈近南北向椭圆状,面积约2.58 km²,是矿化程度最高、规模最大的主矿体。前人勘查结果显示,岩体整体铷含量高,表现为全岩矿化。普遍侵位于上三叠统云雾岭群砂板岩中,外接触带发育角岩化蚀变。

2 地质特征

2.1 岩相学特征

样品采自矿化较好的西部岩体,笔架山岩体岩性为花岗斑岩,呈灰白色至土黄色,块状构造、斑状结构,可划分为浅褐色中细粒花岗斑岩和灰白色细粒花岗斑岩两类[图2(a)、图2(d)]。斑晶为石英(10%~15%)、碱性长石(5%~8%)、黑云母(1%~2%)。石英斑晶呈星散状分布,半自形-他形粒状,粒径主要为0.5~0.8 mm,部分颗粒粒径可达1.5~2 mm,少部分为0.2~0.5 mm;发育港湾结构、熔蚀结构,其中石英颗粒内部的穿孔状熔蚀部分被磁铁矿填充;发育典型蠕虫结构。碱性长石呈自形-半自形粒状或短柱状,粒径为0.3~0.8 mm,少部分为1~1.2 mm,发育卡斯巴双晶,部分颗粒发育不规则裂隙,被绢云母等隐晶质矿物充填。云母斑晶含量较少,呈自形-半自形片状,蚀变严重,晶体边部发育绢云母化。基质主要由长英质矿物和隐晶质云母组成,粒径为0.01~0.02 mm(图2)。

2.2 年代学

笔架山花岗斑岩体采集的样品中选取锆石29粒进行测试,有效测试点位22个。锆石多为浅黄褐色到无色,呈透明-半透明状,粒径150~200 μm,长宽比多为1∶2。部分锆石呈现微弱蜕晶质化现象,部分锆石晶形不完整、晶粒破碎,但保留的部分晶面良好,形态均呈粒状或短柱状。在阴极发光图像中,多数锆石均具有明显的振荡生长环带特征,边部环带较为密集规律,核部呈现不规则、不明显的环带特征(图3)。锆石Th含量为(330~1 180)×10^-6,U含量为(390~3 060)×10^-6,Th/U比值介于0.28~1.09,综合结构和微量元素特征,笔架山花岗斑岩中的锆石具有典型的岩浆成因^[32-34]。²⁰⁶Pb/²³⁸U的加权平均年龄为(5.88 ± 0.06) Ma(MSWD=2.2)(图3)。

2.3 岩石地球化学

2.3.1 主量元素特征

笔架山富铷花岗斑岩体主量元素含量均一,整体呈现富硅、富碱、低钛、低钙和过铝质特征。SiO₂含量为73.30%~74.69%,Na₂O含量3.30%~3.61%,K₂O含量为4.50%~4.80%,CaO含量为0.27%~0.50%,全岩碱含量值(K₂O+Na₂O)介于7.80%~8.67%,Al₂O₃含量介于13.58%~14.46%,全岩铝饱和指数(A/CNK)介于1.09~1.28,TiO₂含量为0.10%~0.90%。在TAS岩石分类图解中,样品数据均位于亚碱性花岗岩区域[图4(a)]。在A/NK-A/CNK图解中,样品数据均位于过铝质区域[图4(b)]。在K₂O-Si₂O图解中,样品数据位于高钾钙碱性系列[图4(c)]。计算得到固结指数(solidification index,SI)介于0.19~0.68,分异指数(differentiation index,DI)介于82.03~83.99,综合上述特征,笔架山花岗斑岩表现出典型的高分异花岗岩特征。

2.3.2 微量元素特征

笔架山花岗斑岩体微量元素含量均一,整体均具有较高的Rb[(1 263~ 2 097)×10^-6含量,同时富集Th[(26.6~76.5)×10^-6]、U[(20.4~51.7)×10^-6]、Nb[(87.8~194)×10^-6]、Ta[(5.03~15.0)×10^-6],强烈亏损Ba[(23.8~70.5)×10^-6]、Sr[(26.4~72.4)×10^-6]、Ti[(278~461)×10^-6](图5),全岩Nb/Ta介于13.0~17.8[图4(d)]。

2.3.3 稀土元素特征

球粒陨石标准化图解呈现明显的右倾趋势,表现为海鸥型,说明笔架山花岗斑岩轻稀土相对重稀土强烈富集。岩体稀土元素含量较为均一,稀土元素总量(∑REE)为(132~202)×10^-6,轻重稀土元素含量比值介于27.1~28.9,(La/Yb)_N为79.3~95.8,δEu为0.14~0.85,具有明显的负Eu异常(图5)^[35]。稀土元素四分组效应指数(TE_1,3)为0.83~0.93,呈现出弱四分组效应。

3 讨论

3.1 铷的赋存状态

铷在自然界中主要呈两种赋存形式:①在少数情况下以铷微斜长石等独立矿物形式产出;②更为普遍的是以类质同象方式置换钾、钠等元素,赋存于云母、长石等含碱金属的硅酸盐矿物中^[8,36-38]。

根据Ab-Or-An三元分类图解判别,笔架山矿床中的长石以透长石为主,含少量钠长石和歪长石[图6(a)]。碱性长石系列构成从KAlSi₃O₈至NaAlSi₃O₈的固溶体系列,并可容纳少量CaAl₂Si₂O₈组分。该系列矿物多数属三斜晶系,仅透长石和正长石为单斜晶系。此外,碱性长石中还可赋存Fe³⁺、Fe²⁺、Mg、Rb、Ba、Sr等微量元素。尽管Rb⁺通常不作为主量元素形式存在于碱性长石中,但在高分异、强分异的花岗岩和花岗伟晶岩中,随着岩浆分异程度的提高,铷可在长石中显著富集。笔架山花岗斑岩中各类长石均含有一定量的铷,其中钠长石的铷含量较低[(42.1~105)×10^-6];歪长石含量中等[(1 468~1 791)×10^-6];透长石含量较高[(564~4 286)×10^-6]。这一分布特征与Rb⁺地球化学行为一致:Rb与K、Na同属碱金属元素,价态相同,离子半径相近(配位数为6时,Rb⁺离子半径为1.52 Å,K⁺为1.38 Å,Na⁺为1.02 Å),其中,1 Å=10¹⁰ m,因此Rb⁺更易通过类质同象置换K⁺进入钾长石端元,而非钠长石[图6(b)]。该过程与铷的强不相容性相耦合,使其在岩浆演化晚期富集于残余熔体,而非高分异作用形成富铷钾长石^[18]。

笔架山岩体中广泛发育的云母类矿物是铷的另一重要赋存载体。在多个大型铷矿床中,黑云母常作为铷的主要载体矿物^[13,39]。其典型的T-O-T型层状结构使层间域能够容纳K⁺、Na⁺等阳离子,由于Rb⁺与K⁺离子半径及化学性质相似,可通过类质同象置换进入云母晶格,为铷的富集提供了结构条件^[39]。笔架山花岗斑岩中的云母以富铁的铁叶云母为主[图6(a)],且多数斑晶已遭受蚀变形成绢云母。这些绢云母呈隐晶质或微晶鳞片状集合体分布于基质中,其晶体结构与白云母完全相同,具备相同T-O-T型层状构造与可交换阳离子的层间域。因此,绢云母与粗粒白云母一样,能通过Rb⁺替代层间K⁺的方式有效固定铷^[39]。实际上,在西藏噶日、江南造山带西坞口等大型铷矿床中^[9,40],白云母(包括细粒变体绢云母)均是关键载铷矿物。笔架山岩体中大量热液绢云母的存在及其对铷的高效吸附,是导致全岩铷品位显著提升的重要控制因素。

综上所述,笔架山铷矿床中的铷主要赋存于碱性长石和云母类矿物中。Rb⁺通过类质同象方式替代钾长石中的K⁺,也可以进入云母(尤其是热液成因绢云母)的层间结构。这两种矿物的共同发育与富铷特征,是控制全岩铷品位升高的主导机制。

3.2 矿物学和岩石学指示

黑云母的成分是反演岩浆氧逸度与液相线温度等物理化学性质的有效指标^[41-43]。笔架山岩体中黑云母斑晶的TiO₂-FeO^tot-MgO三元图解分析结果显示,其主要属于与晚期岩浆热液流体发生化学再平衡的重平衡云母,仅有少数为直接从岩浆中结晶的原生云母[图7(a)]^[44]。这些云母在镜下多呈自形片状,显示深褐色且解理完全,其成分特征靠近原生云母区域。对剩余岩浆黑云母进行∑FeO/(∑FeO+MgO)-MgO图解判别,所有投点均落于壳源区域 ^[8,42]。稀土元素配分曲线呈现海鸥形,并表现为明显的负Eu异常,表现出一定程度的四分组效应,综合来看,表明笔架山岩体岩浆具有壳源成因^[18,45-47]。

笔架山岩体为过铝质高钾钙碱性系列^[48](图4),相容元素Ti、Sr、Ba强烈亏损,而Rb、Cs等不相容元素则明显富集,且具有较为显著的负Eu异常,这些特征符合高分异花岗岩的演化规律^[18,49]。笔架山岩体全岩Zr/Hf为9.77~21.8,Nb/Ta为13.0~17.8,Zr/Hf低于Bau^[50]定义的纯岩浆体系与岩浆-热液体系的分界值。黑云母EPMA数据显示,云母中F含量较高[(3.42~5.60)×10^-6],表明其结晶环境中挥发分的含量较高^[43]。岩相学观察为岩浆热液作用提供了直接证据:黑云母边部普遍发育的绢云母化、钾长石斑晶中典型的石英蠕虫状交代结构,以及被后期绢云母和石英充填的显微裂隙,是热液流体对已结晶矿物进行渗透与交代的直接印证^[47]。

3.3 成矿机制和找矿规律

在笔架山岩体中,铷的富集规律与地球化学行为图解显示,Rb含量升高伴随Nb/Ta、Zr/Hf等特征比值的显著降低,反映出铷元素的富集与岩浆的分异程度呈明显正相关(图8)^{[18,49,51-55]}。结合该岩体具壳源属性的认识,推测其成岩成矿过程如下:在早期岩浆阶段,中下地壳发生部分熔融,铷作为强不相容元素优先进入熔体,形成初始富铷岩浆。随着斜长石(特别是富钙端元)、富铁黑云母和石英等矿物的结晶,相容元素Sr、Ba等被大量消耗并随矿物相移出熔体,而Rb因强烈不相容性在残余熔体中持续富集^[10]。随着岩浆演化程度的进一步提高,在晚期结晶阶段,铷进入钾长石、白云母及部分富镁云母中并进一步富集。在此过程中,热液活动对铷的最终成矿起到关键促进作用。高分异岩浆体系晚期出现的富挥发分流体是促使铷发生极端富集的核心机制^[43]。Zr/Hf等地球化学指标及岩相学证据表明,笔架山岩体在岩浆演化晚期确有富氟流体的参与。

K⁺(0.133 nm)与Rb⁺(0.147 nm)的离子半径存在差异,K⁺与O^2-的结合能更强,导致钾长石在结晶时优先吸纳K⁺,从而使Rb⁺在残余熔体-流体体系中进一步聚集^[46-48]。同时,氟的参与可与铷形成稳定的中性络合物,此类络合物不易被结晶矿物捕获,显著降低了铷在固相中的分配系数,促使其更倾向于在流体相中富集^[10]。此外,氟可进入钾长石晶格发生氧-氟置换,扩大晶体间隙,有利于Rb⁺的进入^[43]。富氟流体还能对硅酸盐熔体产生“解聚”效应,促使硅氧四面体网络断裂,有利于层状硅酸盐矿物(如云母)的结晶,从而提升铷在云母类矿物中的赋存量^[16,49]。因此,在岩浆-热液过渡阶段,体系中原生黑云母等矿物发生蚀变,并大量结晶出Rb含量极高的多硅白云母。这种矿物成为铷的主要载体,最终形成具有工业价值的铷矿体。

综上所述,笔架山铷矿的成矿核心机制为高分异壳源花岗岩的结晶分异与晚期富氟流体活动的耦合作用。早期岩浆分异促使铷在残余熔体中预富集;随后,富氟流体在岩浆-热液过渡阶段促使铷发生超常富集并最终定位成矿。该矿床属典型与高分异花岗岩相关的稀有金属矿床,其成矿模型对区域同类矿产勘查具有重要指导意义。

4 结论

(1)西昆仑笔架山花岗斑岩铷矿床成岩年代锆石U-Pb定年为(5.88 ± 0.06) Ma,为上新世,岩体为壳源高钾钙碱性过铝质高分异花岗岩,经历了高度结晶分异与后期岩浆热液改造。

(2)笔架山铷矿床中铷主要以类质同象方式替代K⁺,赋存于透长石、歪长石等碱性长石和黑云母、绢云母中。

(3)铷的赋存机制与岩体演化过程紧密相关,高度结晶分异使铷在岩浆晚期富集,后期富F岩浆热液活动对促进铷元素迁移和富集起到关键作用,最终通过类质同象固定于碱性长石和云母中实现富集。笔架山铷矿床的地质特征和形成模式对于铷矿勘查与开采具有重要指示意义。

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