Rocks of the Vazante Group in the Morro Agudo region (SE-Brazil) integrate a thick clay-carbonate sequence composed of twelve sedimentary facies and four facies associations (FAs), deposited in a mixed marine passive margin environment. This work carried out systematic isotope analyses of δ¹³C and δ¹⁸O on the two upper stratigraphic units of the Vazante Group (Morro do Calcário and Serra da Lapa formations) and on the Serra do Landim Formation. Despite the pervasive secondary dolomitization and hydrothermal overprint, most samples can be classified as least-altered dolostone, with some exceptions. Samples of Serra do Landim Formation are the ones with the highest degree of alteration, together with a small group of dolomites collected in a sphalerite-mineralized zone, at the top of the Morro do Calcário Formation. The isotopic profiles and the facies analysis showed the Morro do Calcário Formation presents homogeneous values of δ¹³C, and the Serra da Lapa Formation negative values of δ¹³C at the base, upwards inflected towards positive values. These coupled data suggest a significant change of environment in the depositional setting and conditions between these two formations, passing from calmer and stable (Morro do Calcário) to energetic and disturbed (Serra da Lapa). The strong negative values of δ¹³C, namely Lapa anomaly, are associated with diamictite facies below thick layer of carbonates, suggesting the influence of the Sturtian glacial event, in the lower Serra da Lapa Formation. The Lapa anomaly is the best chemostratigraphic marker throughout the sequence and guides the regional correlation of the Vazante Group. The basal diamictites of the Serra da Lapa Formation include dolomitic fragments of Morro do Calcário facies, indicating an intra-basinal source. Based on the isotopic profile correlation, it is inferred that the upper units (Morro do Calcário and Serra da Lapa formations) of the north and south portions of the Vazante Group were deposited in the same basin, or in connected basins, possibly separated, in part, by the Rio Escuro basement High.

莫罗阿古多地区（SE-巴西）的瓦赞特族岩石整合了厚厚的粘土-碳酸盐岩层序，该序列由十二个沉积相和四个相联（FA）组成，沉积在混合的海洋被动边缘环境中。这项工作开展的系统性δ同位素分析¹³ C和δ ¹⁸O在Vazante组的两个上层地层单元（Morro doCalcário和Serra da Lapa地层）和Serra do Landim地层上。尽管普遍存在次生白云石化作用和热液叠印现象，除某些例外，大多数样品都可以归为变化最小的白云岩。Serra do Landim地层的样品蚀变程度最高，在Morro doCalcário地层顶部的闪锌矿矿化带中收集了一小组白云岩。同位素轮廓和相分析表明，莫罗做Calcário形成礼物δ均匀值¹³ C，和δ的埃什特雷拉拉帕形成负值¹³C位于底部，向上朝正值方向弯曲。这些耦合的数据表明，这两个地层之间沉积环境和条件的环境发生了显着变化，从较为平静和稳定（Morro doCalcário）变为活跃而受干扰（Serra da Lapa）。δ的强负值¹³C，即Lapa异常，与碳酸盐厚层以下的铁矾石相有关，表明Serrada Lapa下部的Sturtian冰川事件的影响。Lapa异常是整个序列中最好的化学地层标志，并指导Vazante组的区域相关性。塞拉达拉帕组的基底铁矾土包括Morro doCalcário相的白云岩碎片，表明是基底内的来源。根据同位素剖面相关性，推断瓦赞特群北部和南部部分的上部单元（Morro doCalcário和Serra da Lapa地层）沉积在同一个盆地中，或在可能分离的相连盆地中。部分，由里约埃斯库罗地下室高。