Limestone layers are extensively developed in the continental/ocean transitional Taiyuan Formation. This formation accumulated on the southern North China Block. The precise environmental conditions of the Taiyuan Formation are still controversial. More information about these topics is presented here on the basis of the analysis of trace elements (Mo, V, Cd, Cr, U, Th), which can be used to determine characteristics of the depositional environment, and of carbon and oxygen isotopes (δ¹³C and δ¹⁸O) in limestone samples from the Huainan Coal Basin. Samples were taken for the purpose from cores of all 13 limestone levels, obtained from a coal-exploration borehole (code P2) in the Huainan Coal Basin. It was found that the δ¹⁸O values show a decreasing trend, suggesting a gradual rise of the sea level in a warm climate. Three negative shifts of δ¹³C appear in a lower, a middle and an upper limestone layer, accompanied by relative enrichment of the redox-sensitive elements (Cd, Cr, Mo and V). These three layers are thus deduced to have been deposited in a warm climate with a high sea level and with more terrigenous input than during deposition of the other limestone layers. The redox elements and elemental ratios (V/Cr, Th/U) in the limestones suggest deposition in an oxygen-rich sea with high salinity.

大陆-海洋过渡太原组广泛发育石灰岩层。该地层堆积在华北地块的南部。太原组的确切环境条件仍存在争议。在分析微量元素（Mo，V，Cd，Cr，U，Th）的基础上，本文提供了有关这些主题的更多信息，这些元素可用于确定沉积环境以及碳和氧同位素的特征（ δ ¹³ C和δ ¹⁸ O）石灰石样品中从淮南盆地。为此，从淮南煤田的一个煤炭勘探井（代号P2）获得了所有13个石灰岩岩心的样本。结果发现，该δ ¹⁸O值呈下降趋势，表明在温暖的气候中海平面逐渐升高。的δ三个负位移¹³ Ç出现在一个较低，中间和上部石灰石层，伴随着氧化还原敏感元件（CD，Cr，Mo和V）的相对富集。因此，推断这三层沉积是在比其他石灰石层沉积期间高的海平面和更多陆源输入的温暖气候下沉积的。石灰石中的氧化还原元素和元素比率（V / Cr，Th / U）表明沉积在高盐度的富氧海中。