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南京大学:谢磊—高分异花岗岩体系中铌钽铷铯超常富集与资源属性

  • 2026-07-13 09:37:12
南京大学:谢磊—高分异花岗岩体系中铌钽铷铯超常富集与资源属性
铌(Nb)、钽(Ta)、铷(Rb)、铯(Cs)作为战略性关键金属, 因其卓越的性能在国民经济发展所依托的新兴产业中占据着不可替代的重要地位。然而, 因面临着地壳含量低、储量有限、分布零散、赋存状态不明以及嵌布特征复杂等诸多难题, 这些因素极大地制约了相关矿产资源的开发利用进程。这些元素常共同富集于高分异花岗岩体系之中, 因此, 深入研究该体系中铌、钽、铷、铯赋存状态, 对于精准查明成矿机制、建立成矿规律、判别成矿潜力具有至关重要的意义, 能够为找矿勘查工作提供重要理论依据。
铌、钽、铷、铯均属于不相容元素, 在岩浆的分离结晶过程中, 它们会随着岩浆演化进程, 在晚期逐步富集。不过, 由于这些元素的性质存在差异, 赋存矿物也大不相同。铌钽赋存的独立矿物有180种, 其中以氧化物为主, 如铌铁矿族矿物、烧绿石超族、褐钇铌矿等; 硅酸盐次之。同时铌钽与钛的性质相似, 它们能够置换Ti的位置进入晶格中赋存, 如金红石、榍石、云母等。本文围绕铌钽赋存矿物展开讨论, 深入剖析了其结晶环境的物理化学条件、在热液过程中的活动性、富钽矿物的不共溶区特征以及铌钽分异行为等内容。此外, 综合论述了铌钽不同赋存矿物结晶对成矿作用的指示意义。铷铯属于碱金属, 离子半径较大, 独立矿物相对较少, 其中铷赋存的独立矿物3种; 铯赋存的独立矿物二十余种, 常见的包括铯沸石、铯锂云母、南平石、铯绿柱石等硅酸盐矿物, 这些铯矿物中通常也含有一定量的铷。同时, 铷铯还常通过置换钾离子进入到晶格中, 常在钾长石、云母等矿物中富集, 这些矿物的形成需要更高的演化程度, 明显晚于岩浆期铌钽矿物, 且受到更多流体作用的影响。铷和铯的富集成矿过程既存在相似性, 又具有差异性。
本文系统总结了高分异花岗岩体系中铌、钽、铷、铯赋存矿物的研究成果。在当前地质研究新范式的推动下, 针对矿物赋存形式和状态的研究, 有望在示踪铌、钽、铷、铯成矿作用全过程和资源开发利用中发挥更为重要的作用。
结论及展望

(1) 在高分异花岗岩体系中,铌钽铷铯元素常常同步富集,它们均属于不相容元素,在岩浆结晶分异演化的进程中,岩浆晚期的熔体中逐渐富集。然而,由于这些元素自身性质存在差异,在岩浆-热液体系的不同阶段,它们会赋存在不同类型的矿物之中,展现出差异性成矿特征。这些元素在花岗质体系中的赋存形式主要有两种,一部分以独立矿物的形式存在,包括铌钽氧化物、铷云母、铯锂云母、铯沸石、铯绿柱石等;另一部分则通过类质同像置换的方式,进入矿物晶格中得以赋存,具体来看,铌钽主要通过置换氧化物和硅酸盐中钛元素,而铷铯主要通过置换钾长石和云母中钾元素。这些元素的富集成矿是花岗质岩浆发生高度分异作用的有力体现,受到元素化学行为的制约,它们形成于岩浆-热液的不同阶段,并以特定的特征矿物组合形式呈现。它们不仅是评估花岗岩成矿能力的重要指标,也是反映岩浆分异程度的关键标志。矿物赋存形式和赋存状态的研究,是深入探究元素超常富集过程,系统总结成矿规律的的基础,也是明确矿石资源属性、实现高效利用的根本依据。

(2) 在高分异花岗岩体系中,随着岩浆的分异作用不断增强,该体系呈现出典型的岩相分带特征,在岩体的顶部或边部,还常常会出现伟晶岩、云英岩、伟晶岩壳等独特的岩相组合;就花岗质伟晶岩发育的体系,其分布则表现为向花岗岩体远端呈环状分布,或在脉状伟晶岩中表现出明显的边部到核部带分带的特征。根据全岩铝过饱和指数和岩相组成,可将花岗岩体系分为两类:一类是过铝质-强过铝质花岗岩体系,包括黑云母/二云母花岗岩、白云母花岗岩和锂云母花岗岩;而另一类为准铝-过铝质花岗岩体系,包括(角闪石)黑云母花岗岩、富锂铁叶云母花岗岩和(铁)锂云母花岗岩。尽管两类花岗岩体系在矿物组成有一定差异,但就铌、钽、铷、铯的整体成矿序列而言,有着相似性。从岩浆演化晚期开始,相关成矿作用依次表现为从(Rb-)Nb(Ta),逐渐演化到Li-Rb-Nb(Ta)再演化到Li-Cs(Rb),并呈现出特征矿物组合。从岩浆-热液不同阶段来分析,这两类花岗岩体铌钽富集均起始于岩浆体系,但在过铝质-强过铝质体系以富Ta为显著特征,而准铝-过铝质花岗岩体系以富Nb为特征。在岩浆-热液过渡期,流体富集的环境中,铷开始大量富集,而铯则需要在极端演化的流体环境中才能富集成矿。在伟晶岩发育的花岗质体系中,伟晶岩相关的花岗岩体主体成矿特征并不明显,但花岗岩体晚期相与向外围逐渐分异演化的伟晶岩,与花岗岩体系成矿演化特征基本一致。在不同岩体中,这些成矿序列未必能够能呈现完整,这主要与分异程度差异密切相关。诚然,发生部分熔融的源区组成导致初始岩相不同,进而造成分异趋势的差异,但分异程度却是决定一些特征矿石矿物(如铯锂云母、铯沸石、重钽铁矿等)能否出现的关键因素,而这些分异程度明显与体系中助熔剂元素和挥发份的富集程度密切相关。热驱动和构造驱动又是花岗质岩浆发生分异作用的两个基本的触发因素。

(3) 赋存矿物不仅是可以利用的资源,也是进一步解开地球物质循环难题的有效工具。铌钽氧化物可以反映岩浆的物理化学条件,还是开展U-Pb同位素定年,同时Hf同位素分析的重要矿物,不仅直接确定了岩浆成矿的年代,还弥补高分异花岗岩体系中常因锆石具有高U、多孔、蚀变特征,不适合进行开展年代学工作和示踪源区的缺憾。又如,富集铷铯的长石和云母是可以进一步开发铷铯同位素体系示踪的重要矿物,云母和(铯)绿柱石的Rb-Sr同位素定年方法的成功开发也为精确厘定高分异花岗岩体成岩成矿时代提供了更多选择。

尽管花岗岩体系是世界上最普遍、最重要的稀有金属成矿类型之一,但对于花岗质岩浆的分异甚至极端分异作用的认识仍不系统。源区特征难以限定、分异过程不清、岩浆-热液各阶段界限模糊、流体的作用无法量化、成矿元素富集解耦等问题还有待解决。矿物对元素的竞争性,如在锂辉石伟晶岩中可以发现铯锂云母,但在铯沸石伟晶岩中云母类型大都为白云母,体系中复杂的赋存矿物研究将进一步促进该方向向纵深方向发展。战略性稀有金属一直是国内外成矿作用研究的热点,随着科学技术和分析方法的不断成熟和日趋完善,相关技术难题正在逐一破解,高温高压岩石学、热力学计算模拟以及大数据分析方法等结果与天然样品研究认识的拟合,都将促进元素赋存研究在总结成矿规律、服务找矿勘查中发挥举重要作用。

引用本文:

谢磊, 段昕昊, 田恩农, 侯琛宜, 徐渴鑫, 王汝成. 2026. 高分异花岗岩体系中铌钽铷铯超常富集与资源属性. 岩石学报, 42(5): 1562-1582. doi: 10.18654/1000-0569/2026.05.02

Citation:

XIE Lei, DUAN XinHao, TIAN EnNong, HOU ChenYi, XU KeXin, WANG RuCheng. 2026. Ultra-enrichment and resource attributes of Nb, Ta, Rb and Cs in highly fractionated granite systems. Acta Petrologica Sinica, 42(5): 1562-1582. doi: 10.18654/1000-0569/2026.05.02

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  1. CONNECT:[ UseTime:0.000702s ] mysql:host=127.0.0.1;port=3306;dbname=b460;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000803s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000376s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000326s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000541s ]
  6. SELECT * FROM `set` [ RunTime:0.000289s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000607s ]
  8. SELECT * FROM `article` WHERE `id` = 574886 LIMIT 1 [ RunTime:0.000439s ]
  9. UPDATE `article` SET `lasttime` = 1784255697 WHERE `id` = 574886 [ RunTime:0.007368s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000334s ]
  11. SELECT * FROM `article` WHERE `id` < 574886 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.006957s ]
  12. SELECT * FROM `article` WHERE `id` > 574886 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003733s ]
  13. SELECT * FROM `article` WHERE `id` < 574886 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001614s ]
  14. SELECT * FROM `article` WHERE `id` < 574886 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.015715s ]
  15. SELECT * FROM `article` WHERE `id` < 574886 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.007291s ]
0.153303s