The up to 3000 m thick Mesoproterozoic and Neoproterozoic sedimentary succession exposed at the southern border of the São Francisco Craton, São João del Rei region (southern Minas Gerais State, Brazil), records the stacking of five sedimentary basins. These basins evolved due to multiple rifting episodes related to the southernmost Espinhaço rift system and were deformed around 600 Ma during the evolution of the Ribeira Orogen. These basins are the 1- São João del Rei Basin with quartzite units with maximum depositional age of ca. 1.5 Ga preserved in a half graben associated to the younger rift phases, 2- Carandaí Basin with rift related fault bounded debris flow deposits with maximum depositional age of ca. 1.38 Ga, and a sag carbonate infill recording the post-rift thermal relaxation, 3- Prados Basin, an NE-SW aulacogen linked to the passive margin Andrelândia Basin (<1.04 Ga) and 4- a foreland basin of the Brasiliano Orogeny with early syn-collisional plagioclase wacke deposits with maximum depositional age of ca. 650 Ma. The present paper discusses the role of the faults at the São João del Rei region in the evolution of these basins and the subsequent orogenic deformation. Five phases of fault activity were recognized. The first one is recorded by a few E-W faults and a single N–S fault and associated growth strata within the São João del Rei Basin. The second phase is recorded by activity of NE-SW, E-W and minor NW-SE faults during the Carandaí rifting (1.53–1.38 Ga). The main faults are the NW-SE Lenheiro and São João del Rei faults and the E-W São José Fault. Minor NW-SE faults are interpreted as release faults associated with the last two faults. NE-SW mafic dikes occurring along the faults suggest precursor/coeval magmatism. The third phase is characterized mainly by the reactivation of the NW-SE Lenheiro Fault leading to the development of the NW-SE Prados aulocogen. The fourth phase is inferred to be a reverse reactivation of NW-SE faults related to the NW tectonic transport direction of the Ribeira Orogen. The NW verging D1 folds and steeply SE dipping cleavage contribute to this interpretation. However, the reverse reactivation was insufficient to overcome the cumulative previous normal throw. During the fifth phase NE-SW faults were reactivated as dextral shear zones. Subhorizontal stretching lineation and mylonitic foliation occur along the Lenheiro Fault for at least 60 km. These structures are related to the E-W compression that generated other NE-SW regional dextral shear zones, such as the Três Corações and Caxambu shear zones during the late stages of the Brasiliano Orogeny. Structural data also reveals that during the Carandaí and/or Prados rifting, prior to the orogenic contraction, rotational oblique tilting in what was to become the northern limb of the Lenheiro Anticline generated the difference between the trends of the Beta axis and L1 in the northern limb of the anticline in relation to the other structural domains. This also explains the ENE-WSW trend of the Lenheiro Anticline contrasting with the NE-SW trend of the Águas Santas Syncline and of the other D1 regional folds south of the studied area. A forward model based on a cross section through the Águas Santas Syncline reveals that the NE-SW Lenheiro Fault acted as a major listric fault responsible for the development of a rollover anticline and the half-graben in which the São João del Rei basin deposits are preserved. Rotation and partial erosion of the hanging wall resulted in the deposition of the Carandaí diamictites in angular unconformity on the São João del Rei basin deposits. The model indicates 41% of total extension with a cumulative displacement of 4.2 km produced by the Carandaí and Prados rifting phases. The minimum shortening of the orogenic compressive phase is estimated to be about 11% with 1.57 km of displacement. These values may be underestimated since the model does not take into account parasitic folds, crystalplastic deformation and volume loss produced by layer parallel shortening and metamorphic reactions.

在圣若昂德尔雷地区（巴西米纳斯吉拉斯州南部）的圣弗朗西斯科克拉通南部边界露出的长达3000 m的中元古代和新元古代沉积序列记录了五个沉积盆地的堆积情况。这些盆地是由于与最南端的Espinhaço裂谷系统有关的多次裂陷事件而演化的，并在Ribeira Orogen的演化过程中约600 Ma发生了变形。这些盆地是1-SãoJoãodel Rei盆地，具有石英岩单元，最大沉积年龄约为。1.5 Ga保留在与年轻的裂谷阶段有关的半grab陷中，2-Carandaí盆地具有与裂谷有关的断层界定的泥石流沉积物，最大沉积年龄约为。普拉多斯盆地（Prados Basin）3-38，以及记录下裂后热弛豫的凹陷碳酸盐充填物，与被动缘安德雷纳迪亚盆地（<1.04 Ga）和4-巴西前陆盆地的前陆盆地相联系的NE-SW ula源，具有早期的共碰撞斜长石瓦克沉积，最大沉积年龄约为。650毫安。本文讨论了圣若昂德尔雷地区的断层在这些盆地的演化和随后的造山过程中的作用。断层活动分为五个阶段。第一个记录是由圣若昂德尔雷盆地内的几个EW断层和单个N–S断层以及相关的生长地层记录的。第二阶段是在Carandaí裂谷（1.53-1.38 Ga）期间，NE-SW，EW和较小的NW-SE断层的活动记录的。主要断层是北西-南伦海罗断层和圣若昂德尔断层断层，以及EW圣若泽断层。较小的NW-SE故障被解释为与最后两个故障相关的释放故障。沿断层发生的NE-SW铁镁质岩堤表明前兆/后代岩浆作用。第三阶段的主要特征是NW-SE Lenheiro断层的复活，导致了NW-SE普拉多斯产金质的发展。推断第四阶段是与里贝拉造山带的西北构造输送方向有关的西北-东南断层的逆向激活。西北边缘的D1褶皱和陡峭的SE浸入卵裂对此作出了解释。但是，反向重新激活不足以克服累积的先前正常抛出。在第五阶段，NE-SW断层被重新激活为右旋剪切带。沿伦海罗断裂的至少60公里处发生了水平以下的伸展线和髓鞘状叶状。这些结构与EW压缩有关，后者在Brasiliano造山运动的后期产生了其他NE-SW区域右旋剪切带，例如TrêsCorações和Caxambu剪切带。结构数据还显示，在Carandaí和/或Prados裂谷过程中，造山运动收缩之前，旋转倾斜倾斜（后来成为Lenheiro背斜的北肢）引起了Beta轴趋势与北部L1趋势之间的差异。背斜的四肢相对于其他结构域的关系。这也解释了Lenheiro背斜的ENE-WSW趋势与ÁguasSantas Syncline和研究区域以南的其他D1区域褶皱的NE-SW趋势形成对比。基于穿过ÁguasSantas Syncline的横截面的正向模型显示，NE-SW Lenheiro断层是主要的断层错，负责形成翻转背斜和SãoJoãodel Rei盆地沉积物所处的半graben保留。悬挂壁的旋转和部分侵蚀导致Carandaí菱铁矿以角度不整合的形式沉积在SãoJoãodel Rei盆地沉积物上。该模型显示Carandaí和Prados裂谷阶段产生的总延伸量的41％，累积位移为4.2 km。造山压缩相的最小缩短估计为位移为1.57 km时约为11％。由于该模型未考虑寄生褶皱，因此这些值可能会被低估，