Geochemical signatures and geodynamic significance of Gejiu alkaline complex in southwestern South China Block

LIN Lihang; ZHU Renzhi; LAI Shaocong; LIU Peng; LIU Min; QIN Jiangfeng; YANG Hang

doi:10.16152/j.cnki.xdxbzr.2025-02-003

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Geochemical signatures and geodynamic significance of Gejiu alkaline complex in southwestern South China Block

更新时间：2025-04-21

- Geochemical signatures and geodynamic significance of Gejiu alkaline complex in southwestern South China Block
- Journal of Northwest University (Natural Science Edition) Vol. 55, Issue 2, Pages: 246-261(2025)
- 作者机构：
  
  西北大学　地质学系/大陆演化与早期生命全国重点实验室，陕西　西安　 710069
- 作者简介：
- 基金信息：
- DOI：10.16152/j.cnki.xdxbzr.2025-02-003
  CLC： P588.15
- Received：09 November 2024，
  
  Published：25 April 2025
- 稿件说明：
移动端阅览
LIN Lihang, ZHU Renzhi, LAI Shaocong, et al. Geochemical signatures and geodynamic significance of Gejiu alkaline complex in southwestern South China Block[J]. Journal of northwest university (natural science edition), 2025, 55(2): 246-261.
DOI：

LIN Lihang, ZHU Renzhi, LAI Shaocong, et al. Geochemical signatures and geodynamic significance of Gejiu alkaline complex in southwestern South China Block[J]. Journal of northwest university (natural science edition), 2025, 55(2): 246-261. DOI： 10.16152/j.cnki.xdxbzr.2025-02-003.

摘要

为了探究华南板块西南缘大陆岩石圈的演化过程，该研究编译、总结华南板块西南缘晚白垩世个旧碱性杂岩体已报道的全岩主微量元素（

=76）、全岩Sr-Nd-Pb同位素（

=54）及锆石Hf同位素数据（

=113），对个旧碱性杂岩体的地球化学特征和成因模型进行重建。地球化学特征显示，研究区个旧碱性杂岩体分为3组岩石组合：第一组为钾玄质霞石正长岩，具有高全碱质量分数（12.76%～17.57%）和总稀土元素含量（134×10

-6

～1764×10

-6

）、低Ba/La比值，以及富集的Sr-Nd-Pb-Hf同位素特征，指示了其源区为经历过俯冲熔体交代的富集地幔；第二组为钾玄质二长辉长岩-二长岩组合，二者具有极高的Ba（1 619×10

-6

～4 640×10

-6

）和Sr（970×10

-6

～1 690×10

-6

）含量、低的Th/Yb比值，具有与霞石正长岩相似的Sr-Nd-Pb-Hf同位素特征，表明其起源于俯冲流体交代的富集地幔；第三组为二长花岗岩-钾长花岗岩组合，其具有高的Th（30.7×10

-6

～68.3×10

-6

）和U（4.11×10

-6

～23.2×10

-6

）含量、与下地壳一致的Nb/U比值及相似的微量元素分布特征，表明其起源于不同深度的下地壳。二长花岗岩发育有暗色包体及相关幔源地球化学特征，指示源区经历过幔源岩浆注入并发生壳幔岩浆混合。华南板块岩石圈晚白垩时期，在新特提斯洋俯冲过程的影响下发生了东西向的伸展，进而诱发岩石圈伸展背景下的软流圈物质上涌，导致大陆岩石圈物质再造；同时，大量幔源物质注入下地壳促进了大陆地壳生长。

Abstract

To investigate the evolution of the continental lithosphere of the southwestern South China Block

this study compiled previously whole-rock major and trace elements (

=76)

whole-rock Sr-Nd-Pb isotopes (

=54) and in-situ zircon Hf isotopes data (

=113) of late Cretaceous Gejiu alkaline complex in South China Block

to reconstruct the geochemical signature and petrological model. According to its geochemical characteristics of the alkaline complex

which can be divided into three groups. Group one

shoshonitic nepheline syenites that show notably high total alkali (12.76%～17.57%) and total REE contents (134×10

-6

～1 764×10

-6

)

low Ba/La ratios

and enriched Sr-Nd-Pb-Hf

indicating the enriched lithospheric mantle metasomatized by subduction-related melts. Group two

shoshonitic monzogabbro-monzonite suite has strongly high Ba (1 619×10

-6

～4 640×10

-6

) and Sr (970×10

-6

～1 690×10

-6

) contents

low Th/Yb ratios

similar to Sr-Nd-Pb-Hf isotopic components in nepheline syenite

indicating the enriched lithospheric mantle metasomatized by subduction-related fluids. Group three

monzogranite-K-feldspar granite suite shows high Th (30.7×10

-6

～68.3×10

-6

) and U (4.11×10

-6

～23.2×10

-6

) contents

and consistently Nb/U ratios of the lower crust and its trace element characteristics

indicating that they could be derived from the lower crust at variable depth. The MME and mantle-derived geochemical signatures are very developed in monzogranites

which indicate that their sources have experienced mantle-derived magma injection and crust-mantle magma mixing. During the Late Cretaceous

the South China Block occurred the lithospheric extension in the east-west direction that was influenced by the Neo-Tethys tectonic system

then the upwelling of asthenosphere material resulted into the reworking of the lithosphere

where a large amount of mantle-derived magma was injected into the lower crust and supported continental crust growth.

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