The black rock series in the Qiongzhusi Formation contains important geochemical information about the early Cambrian tectonic and ecological environment of the southwestern Yangtze Block. In this paper, major, trace, and rare earth element data are presented in an attempt to reveal the sediment source during the deposition of the early Cambrian Qiongzhusi Formation and to reconstruct the sedimentary tectonic environment and weathering intensity during that time. The basin primarily received continental clastic material with neutral-acidic igneous rocks from a stable source and with a moderate level of maturity during the depositional period of the Qiongzhusi Formation. Furthermore, the strata were weakly influenced by submarine hydrothermal fluids during diagenesis. The reconstruction of the sedimentary environment and weathering intensity shows that P 2 O 5 enrichment and water body stratification occurred due to the effects of upwelling ocean currents during the depositional period of the Qiongzhusi Formation. The combination of upwelling and bottom-water hydrothermal fluids led to environmental changes in the study area, from dry and hot to moist and warm. Last, the reconstruction of the tectonic environment of the Qiongzhusi Formation indicates that deposition occurred in continental slope and marginal marine environments associated with a continental arc tectonic system. These findings provide an essential basis for the comprehensive reconstruction of the early Cambrian sedimentary environment of the Yangtze Block.

中文翻译：

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西南扬子地块下寒武统Qi竹寺组黑岩系列地球化学：沉积与构造环境重构

zhu竹寺组的黑岩系列包含重要的地球化学信息，有关扬子西南部的早期寒武纪构造和生态环境。本文介绍了主要，痕量和稀土元素数据，试图揭示寒武纪Qi竹寺组早期沉积过程中的沉积物来源，并重建该时期的沉积构造环境和风化强度。在琼竹寺组沉积期间，该盆地主要接收来自稳定来源的中性酸性火成岩的陆相碎屑岩，且成熟度适中。此外，在成岩过程中，地层受海底热液的影响很小。沉积环境和风化强度的重建表明，Qi竹寺组沉积期上升的洋流影响了P 2 O 5的富集和水体分层。上升流和底水热液的结合导致了研究区域的环境变化，从干燥和炎热到潮湿和温暖。最后，Qi竹寺组构造环境的重建表明沉积发生在与大陆弧构造系统相关的大陆斜坡和边缘海洋环境中。这些发现为扬子地块早期寒武纪沉积环境的全面重建提供了必要的基础。