The supply and preservation of terrestrial organic matter (TOM) during early Carboniferous glacial-interglacial intervals in South China were investigated with respect to their roles in paleo-environmental variation and organic matter (OM) accumulation in black shales. The marine redox proxies such as V/Cr, C_org/P ratios, and Mo–U covariation indicate a fully oxic water condition during the earliest Visean, while dominant oxic with occasional suboxic water conditions prevailed during the early to middle Visean. High sedimentary δ¹⁵N values (1.9–6.3‰) suggest the existence of enhanced water-column denitrification in the expanded oxygen minimum zones (OMZs) during the earliest Visean, whereas lower δ¹⁵N values (avg. 2.6‰) during the early to middle Visean indicate a decreasing water column denitrification in the reduced OMZs. Both the organic matter compositions and the relationship between C_org/N ratios and δ¹³C_org values indicate a significant contribution of terrestrial OM in the marine sediments, and the low abundance of marine OM is mainly attributed to the low paleoproductivity as evidenced by low P/Ti and Ba/Al ratios. One reason for such a high contribution of TOM is that a large amount of plant debris and wildfire-derived OM was preserved during Tournaisian glacier time and then released and buried rapidly in the marine sediments during the interglacial interval of Visean due to the temperature-driven glacial melting. The rapid transportation of large quantity of TOM from land to ocean may have resulted in remarkable drawdown of atmospheric pCO₂ and subsequent cool climate, as evidenced by the decoupled relationship between δ¹³C_org and δ¹³C_carb values. In summary, the sinking of TOM flux during the sea level lowstand and highstand may be the controlling factor for the paleo-environmental variation as well as OM accumulation in the Visean black shales.

研究了华南地区石炭纪早期冰川-冰川间期的陆地有机质（TOM）的供应和保存及其在黑色页岩古环境变化和有机质（OM）积累中的作用。V / Cr，C _org / P比值和Mo–U协变量等海洋氧化还原指标表明，最早的Visean处于完全含氧的水状态，而在Visean的早期至中部则占优势的含氧，偶有亚含氧的水状态。高沉积δ ^15个N个值（1.9-6.3‰）中的最早的建议增强的水柱脱氮的在扩张氧最小区域（OMZs）存在维宪，而较低δ ¹⁵在Visean早期到中期，N值（平均2.6‰）表明在OMZ减少的地区水柱反硝化作用降低。无论是有机物的组合物和C之间的关系_的有机/ N比和δ ¹³ C ^_有机值表明陆地OM在海洋沉积物中的重要贡献，而海洋OM的低丰度主要是由于低P / Ti和Ba / Al比证明了古生产力低。TOM如此之高的原因之一是，在图尔尼斯冰川时期，大量植物碎片和野火衍生的OM被保存下来，然后由于温度驱动，在Visean的冰川间期迅速释放并掩埋在海洋沉积物中冰川融化。从陆地到海洋大量TOM的快速运输可能造成大气的pCO的显着压降₂和随后的凉爽的气候，如δ之间证明解耦关系¹³ Ç_有机和δ ¹³C_{碳水化合物}值。总之，海平面低位和高位期间TOM通量的下沉可能是Visean黑色页岩中古环境变化以及OM积累的控制因素。