In this contribution, multi-proxy geophysical methods have been used to analyze the subsurface Neoproterozoic limestone mantle configuration. We also evaluate the relationship between the sedimentary cover and the crystalline basement in order to propose an integrated geophysical model for the graben structures of the Olavarría-Sierras Bayas area, Tandilia System, Argentina. We obtained gravimetric and magnetometric field measurements and vertical electrical sounding profiles (VES) over the prospected area to achieve this objective.

The gravimetric and magnetometric high anomalies were associated with the surface basement's proximity recognized in the north and south-central regions. In contrast, the low anomalies correspond to a thickening of the sedimentary cover in the rest of the area. The explored graben configuration is defined by the NW-SE and NE-SW system faults of the Tandilia System. In the study area, the calculated sedimentary cover thickness is ca. 230 m in the south-central high anomaly region and reaches a maximum thickness of ca. 360 m in the southwest sector. The limestone mantle was detected inside the Neoproterozoic sedimentary succession sequence with the vertical electrical sounding (VES) at depths between ca. 40–60 m in the north sector and at ca. 130–145 m in the southern, with a degree of error close to 10% with respect to the drilling data. The link between the geophysical and the stratigraphic-structural models proves that the multi-proxy geophysical methods applied in this work constitute an improvement in order to understand the crystalline basement - sedimentary succession configurations. Moreover, this multi-proxy geophysical methodology allows estimating the depth and thickness of limestone mantle occurrence into graben-like structures with a high degree of confidence.

在这篇文章中，多代理地球物理方法已被用于分析地下新元古代石灰岩地幔构造。我们还评估了沉积盖层和结晶基底之间的关系，以便为阿根廷坦迪利亚系统的 Olavarría-Sierras Bayas 地区的地堑构造提出综合地球物理模型。我们获得了勘探区域的重力和磁场测量以及垂直电测深剖面 (VES) 以实现这一目标。

重力测量和磁力测量的高异常与在北部和中南部地区识别出的地表基底的接近度有关。相比之下，低异常对应于该地区其余部分的沉积盖层增厚。探地地堑配置由 Tandilia 系统的 NW-SE 和 NE-SW 系统故障定义。在研究区，计算出的沉积覆盖层厚度约为。中南部高异常区 230 m，最大厚度约 西南段 360 m。石灰岩地幔在新元古代沉积层序序列中被探测到，在大约 20 米之间的深度进行垂直电测深（VES）。北区 40–60 m 和约。南部130～145 m，钻孔数据误差接近10%。地球物理模型和地层结构模型之间的联系证明，这项工作中应用的多代理地球物理方法构成了理解结晶基底 - 沉积层序配置的改进。此外，这种多代理地球物理方法允许以高置信度估计石灰岩地幔产状到地堑状结构的深度和厚度。