Contrasting models for internal versus external locations of the South China Craton (SCC) in the supercontinent Rodinia and associated mantle plume or ocean subduction dominated tectonic processes can be resolved by detrital zircon U-Pb dating and Lu-Hf isotopic analyses on the Cryogenian Nanhua Supergroup in the central SCC. Our results show that samples from the lower Liantuo, Tiesi’ao, and Datangpo formations of the Nanhua Supergroup show three age peaks at 2.50 Ga, 2.05 Ga, and 0.85 Ga, and those of the upper Nantuo Formation yield four peaks at 2.50 Ga, 2.05 Ga, 0.85 Ga, and 0.65 Ga. The Archean and Paleoproterozoic (1.80–2.10 Ga) zircons have εHf(t) values of −16.3 to +4.7 and −23.0 to +4.2, and may be sourced from the Kongling and Douling complexes and Paleoproterozoic intrusions in the northern Yangtze Block, respectively. Early Neoproterozoic (0.70–0.96 Ga) zircon grains show variable εHf(t) values of −20.0 to +15.0. In combination with the absence of Mesoproterozoic detrital zircons in the Nanhua Supergroup, huge volumes of Neoproterozoic granitic intrusions in the northern Yangtze Block are the potential sources for the 0.70–0.96 Ga detrital zircons. Only the siltstone of the Nantuo Formation has late Neoproterozoic (0.63–0.69 Ga) detrital zircons with high and positive εHf(t) values (+7.9 to +9.4). Several granitoid intrusions (0.63–0.68 Ga) in the Wudang and Ankang uplift of the South Qinling belt in the northern Yangtze Block provide the late Neoproterozoic detrital zircons of the Nantuo Formation. These provenance analyses of the Nanhua Supergroup indicate an interior source from the SCC, rather than an exterior source from the Laurentia and Australia cratons. The Neoproterozoic rift basins and magmatic rocks in the SCC were produced by secular episodic subductions and back-arc extensions, rather than a Neoproterozoic super-mantle plume. The SCC occupied a peripheral position adjacent to northern India in Rodinia during the Neoproterozoic. These conclusions will promote our understanding of genetic mechanism and distribution prediction of the several Cryogenian–Cambrian black-shale layers and excellent source rocks in the SCC.

中文翻译：

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低温时期罗迪尼亚内华南克拉通的内部与外部位置：南华盆地的物源史

超大陆罗迪尼亚州华南克拉通（SCC）内部和外部位置以及相关的地幔柱或以海洋俯冲为主的构造过程的对比模型可以通过碎屑锆石U-Pb测年和低温冰冻的南华超群的Lu-Hf同位素分析来解决在中央SCC。我们的结果表明，南华超群的莲托，铁西澳和大唐坡下部地层样品在2.50 Ga，2.05 Ga和0.85 Ga出现了三个年龄峰，而南投组的上部在2.50 Ga出现了四个峰， 2.05 Ga，0.85 Ga和0.65 Ga。太古宙和古元古代（1.80-2.10 Ga）锆石的εHf（t）值为−16.3至+4.7和−23.0至+4.2，并且可能来自Kongling和Douling络合物扬子地块北部的古生界和古元古代入侵。早期新元古代（0.70–0.96 Ga）锆石晶粒的εHf（t）变量值介于-20.0至+15.0之间。结合南华超群中元古生代碎屑锆石的缺失，扬子地块北部大量新元古代花岗岩侵入体是0.70–0.96 Ga碎屑锆石的潜在来源。只有南拓组的粉砂岩具有新元古代晚期（0.63-0.69 Ga）碎屑锆石，其εHf（t）值较高且为正（+7.9至+9.4）。扬子北段南秦岭带的武当隆起和安康隆起有几处花岗岩侵入（0.63-0.68 Ga）提供了南多组晚新元古代碎屑锆石。这些对南华超级集团的出处分析表明，内部来源来自SCC，而不是从Laurentia和Australia克拉通的外部来源。SCC中的新元古代裂谷盆地和岩浆岩是由世俗的俯冲俯冲和后弧扩展产生的，而不是由新元古代的超地幔柱形成的。在新元古代，SCC在印度北部的Rodinia占据了外围位置。这些结论将增进我们对南海中几个低温-寒武纪黑色页岩层和优质烃源岩的成因机理和分布预测的理解。