The ‘Helmut’ geophysical anomaly: A regional left-lateral transtensional shear zone system connecting Santos and Campos basins, southeastern Brazil

Basement geology and its controls on the nucleation and growth of rift faults in the northern Campos Basin, offshore Brazil

“…Evidence of basement-related shear zones being reactivated during South Atlantic rifting is documented in the onshore and offshore portions of Campos Basin (Chang et al, 1992;Dehler et al, 2016;Fetter, 2009;Savastano et al, 2017). Stanton et al (2010) studied magnetic features across the onshore and offshore and showed that syn-rift faults and dikes are parallel to the NE-SW Ribeira Belt shear zones, but are orthogonal to the CFTD structural grain.…”

“…Evidence of basement‐related shear zones being reactivated during South Atlantic rifting is documented in the onshore and offshore portions of Campos Basin (Chang et al., 1992; Dehler et al., 2016; Fetter, 2009; Savastano et al., 2017). Stanton et al.…”

“…(a) Onshore and offshore geological setting of the Campos Basin. Offshore geology modified from Fetter (2009) and Silva et al (2004); Helmut Lineament according to Dehler et al (2016). Onshore geology modified from Egydio‐Silva et al (2018) and Schmitt et al (2016).…”

Geodynamics of the asymmetrical Santos-Namibe conjugate basins

“…The kinematics and strain partitioning of the Santos-Namibe basins is described in Figure 5. Instead of a complex model with multiple internal structural blocks in a transform passive margin, as proposed by Moulin et al (2012), strain partitioning is explained by an oblique-sinistral extensional system, as described originally by Macedo (1990) and later by Meisling et al (2001), Mohriak et al (2010), Rigoti (2015) and Dehler at al. (2016).…”

Tectonic control of the oil-rich large igneous-carbonate-salt province of the South Atlantic rift

“…3,4). Dehler et al (2015) described a major left-lateral transtensional shear zone (Helmut) along the NE-trending SE margin of the Outer High of the Santos Basin. Rabinowitz and LaBrecque (1979) placed the pole of early rotation of the South America -Africa displacement, relative to South America, at this continent's Equatorial margin, at the continent-ocean boundary of NE-Brazil (Fig.…”