Proterozoic tectonics of eastern South China and their Paleo-location reconstruction

WANG Yuejun; SHU Liangshu; ZHANG Yuzhi; CAWOOD A. Peter; QIAN Xin; GAN Chengshi; WANG Cheng

doi:10.13471/j.cnki.acta.snus.ZR20240043

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Proterozoic tectonics of eastern South China and their Paleo-location reconstruction

Invited article | 更新时间：2024-04-10

- Proterozoic tectonics of eastern South China and their Paleo-location reconstruction
- Acta Scientiarum Naturalium Universitatis Sunyatseni Vol. 63, Issue 2, Pages: 1-25(2024)
- 作者机构：
  
  1.广东省地球动力作用与地质灾害重点实验室 / 中山大学地球科学与工程学院 / 南方海洋科学与工程广东省实验室（珠海），广东珠海 519082
  2.南京大学地球科学与工程学院，江苏南京 210023
  3.School of Earth, Atmosphere and Environment, Monash University, Melbourne VIC 3800, Australia
- 作者简介：
- 基金信息：
- DOI：10.13471/j.cnki.acta.snus.ZR20240043
  CLC： P534.5;P542
- Published：25 March 2024，
  
  Published Online：16 March 2024，
  
  Received：05 February 2024，
  
  Accepted：23 February 2024
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王岳军,舒良树,张玉芝等.华南东部元古代构造格局及其古位置重建[J].中山大学学报(自然科学版)(中英文),2024,63(02):1-25.

WANG Yuejun,SHU Liangshu,ZHANG Yuzhi,et al.Proterozoic tectonics of eastern South China and their Paleo-location reconstruction[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):1-25.
王岳军,舒良树,张玉芝等.华南东部元古代构造格局及其古位置重建[J].中山大学学报(自然科学版)(中英文),2024,63(02):1-25. DOI： 10.13471/j.cnki.acta.snus.ZR20240043.

WANG Yuejun,SHU Liangshu,ZHANG Yuzhi,et al.Proterozoic tectonics of eastern South China and their Paleo-location reconstruction[J].Acta Scientiarum Naturalium Universitatis Sunyatseni,2024,63(02):1-25. DOI： 10.13471/j.cnki.acta.snus.ZR20240043.

摘要

包括扬子、华夏和琼西南诸多块体的华南东部保存了与哥伦比亚和罗迪尼亚超大陆聚散有关的丰富地质记录，是理解东亚前寒武纪动力学演化的关键地区。本文基于琼西南、扬子东部和华夏陆块元古代地层和岩浆记录，分析并综述了华南东部地区元古代构造过程及其在超大陆的古位置。研究表明，琼西南地块在中元古代（~1.45 Ga）时期形成于哥伦比亚超大陆内部的非造山裂谷环境，经历了~1.05 Ga的麻粒岩相高级变质作用。其与扬子西南缘关系紧密，在~1.30~1.05 Ga期间，可能作为中元古代Albany-Fraser造山带的一部分。华夏和扬子东部在新元古代早期显示差异的地质特征，两者因古华南洋而分隔。江山-绍兴缝合带以东的华夏陆块发育

（

）值为负的~1.0~0.9 Ga长英质火山岩，与江-绍缝合带之西的扬子陆块同期具正

（

）值的双溪坞弧迥然不同，他们很可能是响应于原高止大洋俯冲而作为早新元古代（~1.0~0.9 Ga）原华夏造山作用的地质记录

。

怀玉和江南地区广泛发育~870~830 Ma的火成岩（集中在850~830 Ma），其碎屑岩含~860~830 Ma碎屑锆石年龄峰值、~980 Ma锆石颗粒较少。相反华夏陆块较少发育同期火成岩，碎屑岩中~980 Ma碎屑锆石丰富而~860~830 Ma碎屑锆石少见。以裂谷环境为其成因性质的~820~750 Ma板溪群、沥口群和马面山群及同期火成岩广泛见于华夏和怀玉地块及江南造山带，并以角度不整合经沧水铺群和骆家门砾岩与冷家溪群及其相当岩系分割，自此使之进入相对稳定的板内沉积演化期。研究认为，新元古代早期（~1.0~0.9 Ga）在华夏内部武夷-云开一线发育了与印度Eastern Ghats造山带走向相接的增生造山带，同时在扬子与华夏陆块之间发育了新元古代古华南洋，该大洋向西持续俯冲形成了长寿命的新元古代（~0.97~0.83 Ga）华南沟-弧系统，相继形成了~0.98~0.88 Ga的双溪坞洋内弧，~0.87~0.83 Ga怀玉大陆弧及~0.87~0.83 Ga的江南陆内弧后盆地，可与罗迪尼亚超大陆外缘印度西北的新元古代德里造山带相对比。该系统内双溪坞洋内弧盆在~0.87 Ga关闭而转入~0.87~0.83 Ga的怀玉-江南安第斯型活动大陆边缘，进而于~830~810 Ma由扬子和华夏陆块沿江南造山带拼合而成古华南陆块，自810 Ma之后由于罗迪尼亚超大陆裂解及大规模后造山裂谷作用，造就了板溪群及其相当岩系和同期双峰式火成作用。

Abstract

The Meso- and Neo-proterozoic geological records in eastern South China are the key carriers for understanding the Columbia and Rodinia supercontinent cycles and the geodynamic evolution of East Asia，which are yet uncertain so far. This paper presents an overview of key geological observations for the southwest Hainan，eastern Yangtze， and Cathaysia with respect to Proterozoic tectonics. Our data show that the SW Hainan in the Mesoproterozoic（~1.45 Ga）developed in a non-orogenic rift setting in the Columbia interior which was undergone by the ~1.05 Ga high-grade metamorphism. SW Hainan might be a part of the Mesoproterozoic Albany-Fraser Orogen at ~1.30-1.05 Ga，and，subsequently moved to the margin of Rodinia. Cathaysia and eastern Yangtze display distinct geological signatures in the early Neoproterozoic and Cathaysia remained separated from Yangtze until at least ~1.0 Ga，even ~0.83 Ga. The ~1.0-0.9 Ga felsic igneous rocks in Cathaysia are dominated by negative

（

） values，and distinct from those in the coeval Shuangxiwu arc with positive

（

）values. Such signatures might be the response to the subduction of the Proto-Ghats Ocean，herein named the Early Neoproterozoic Proto-Cathaysia Orogen. The ~870-830 Ma（mainly 850-830 Ma）igneous rocks are extensive in the Huaiyu and Jiangnan Orogen but poor in Cathaysia. The Cathaysia Neoproterozoic sedimentary rocks are signed by ~980 Ma detrital grains but dominated by ~860-830 Ma detrital zircons for the Jiangnan and Huaiyu sedimentary rocks. Banxi，Likou and Mamianshan groups and their equivalents are extensively developed in Cathaysia and Huaiyu，and the Jiangnan Orogen，respectively，and are characterized by the rift-related sedimentary rocks and bi-model igneous rocks with the formation ages of ~810-750 Ma. They are separated from the Cangshuipu and Luojiamen conglomerates across an angular unconformity or unconformably underlain by the Lengjiaxi and Xikou groups. In combination with the available data，it is proposed for a long-lived Neoproterozoic（~0.97-0.83 Ga）and westward-subducted Proto-Huanan arc-trench system signed by ~0.98-0.88 Ga Shuangxiwu intra-oceanic arc，0.87-0.83 Ga Huaiyu continental arc and 0.87-0.83 Ga Jiangnan intra-continental back-arc basin，which switched from an intra-oceanic to a continental Andean margin setting at ~0.87 Ga. Such a system lay along strike from the synchronous Eastern Ghats and South Delhi orogen at the periphery of Rodinia. Our data revealed the united proto-South China being created by the ~830-810 Ma Jiangnan orogenesis in response to the assemblage of the Yangtze with Cathaysia，which was followed by the post-orogenic rifting due to the breakup of Rodinia.

关键词

中新元古代构造格局哥伦比亚内部罗迪尼亚外缘古华南洋扬子-华夏陆块

Keywords

Meso- and Neo-proterozoic geological recordsColumbia interiorRodinia peripheryLong-lived Proto-Huanan subductionYangtze-Cathaysia assemblage

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