The Shuangjianzishan Ag–Pb–Zn deposit is hosted by an over 2030-m-thick succession of Late Carboniferous slate-dominated deep-water sediments. Three tuff layers interbedded with slates yield zircon U–Pb ages of 314.4 ± 2.5 Ma, 315.9 ± 3.6 Ma, and 317.9 ± 2.3 Ma. Using Monte-Carlo simulations, we constrain the maximum time span between the bottom tuff and the top tuff to no longer than 6.9 Myr at a 2σ (95.3%) confidence level. On the basis of this time span, the long-term accumulation rate of the Shuangjianzishan slates is 294 m/Myr. This accumulation rate is faster than any subduction-related accumulation rates by at least 30%; it is similar to that of fine deposits in a rift setting. The variably low δ¹⁸O of the zircons from the interbedded tuffs also suggest that a high-temperature hydrothermal alteration occurred during the generation of the low δ¹⁸O parental magma. Magmatic–hydrothermal events related to a rifting event are the most likely mechanism that caused the low δ¹⁸O signature. The chemical compositions of the slates suggest that their source rocks were very immature, probably similar to contemporary intermediate to acidic volcanic rocks. On the basis of down-well logging data, the dipping angle data are plotted with the stratigraphic depth of each stratum. The stable dipping angle of the slates also supports a sedimentation processes in an active rifting environment.

双尖子山Ag-Pb-Zn矿床是由2030米厚的晚石炭系板岩为主的深水沉积物所组成。三层凝灰岩与板岩互生，锆石U–Pb年龄为314.4±2.5 Ma，315.9±3.6 Ma和317.9±2.3 Ma。使用蒙特卡洛模拟，我们在2σ（95.3％）的置信度下，将底部凝灰岩和顶部凝灰岩之间的最大时间限制为不超过6.9 Myr。在此时间段内，双尖子山板岩的长期堆积速率为294 m / Myr。这个积累速度比任何与俯冲有关的积累速度都要快至少30％。它与裂谷环境中的精细沉积相似。该可变低δ ¹⁸从互凝灰岩锆石的O-还表明，δ产生低的过程中出现的高温热液蚀变¹⁸ ö母岩浆。相关的裂谷事件岩浆热液活动是导致低δ最有可能的机制¹⁸ Ø签名。板岩的化学成分表明，它们的烃源岩非常不成熟，可能与现代的酸性火山岩中间层相似。根据井下测井数据，绘制倾角数据以及每个地层的地层深度。板岩的稳定倾角也支持主动裂谷环境中的沉积过程。