Deformation characteristics, kinematic analysis, and formation ages of gneissose Palala granite in the Palala Shear Zone, southern boundary of the Central Zone, Limpopo Belt, South Africa

Liang, Chenyue; Liu, Xiaojing; Kramers, Jan D.; Zheng, Changqing; Hu, Pengyue; Zhang, Qian

doi:10.1016/j.jafrearsci.2020.104092

Cited by 3 publications

(2 citation statements)

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“…A sinistral shear sense has been noted on the sub-parallel PSZ by Vearncombe (1987, 1992) and Brandl and Reimold (1990). However, the PSZ has a dextral strike slip net displacement, which was the result of NNW-SSE shortening and transpression (Holzer et al 1998;Schaller et al 1999) between 2053.5 ± 9.9 Ma and 1971 ± 26 Ma (Liang et al 2021). The most likely age for this deformation is c. 2025 Ma (Liang et al 2021).…”

Section: Introductionmentioning

confidence: 99%

“…However, the PSZ has a dextral strike slip net displacement, which was the result of NNW-SSE shortening and transpression (Holzer et al 1998;Schaller et al 1999) between 2053.5 ± 9.9 Ma and 1971 ± 26 Ma (Liang et al 2021). The most likely age for this deformation is c. 2025 Ma (Liang et al 2021). This dextral displacement may therefore postdate syn-Bushveld sinistral movement.…”

Section: Introductionmentioning

confidence: 99%

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Structural context of the Flatreef in the Northern Limb of the Bushveld Complex

Brits,

Grobler,

Crossingham

et al. 2024

Miner Deposita

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The Flatreef occurs at a depth of 700 m under the farm Turfspruit 241 KR in the Northern Limb of the Bushveld Complex. The Flatreef forms part of the Platreef of the Northern Limb, which contains magmatic rocks of the Rustenburg Layered Suite of the Bushveld Complex. The structure of the Flatreef is a flat-lying to gently westerly dipping monoclinal to open fold, 1 km wide and 6 km long. Distinctive features within the Flatreef include the development of cyclical magmatic layering with locally thickened pyroxenitic layers, and associated economically significant poly-metallic mineralisation. Geophysical evidence, exploration drill core, and recent underground exposure show that deformation had a major influence on the Flatreef mineralization. Block faulting and first generation folding affected the orientation and shape of the sedimentary host-rock sequence prior to intrusion of the Rustenburg Layered Suite. These structural and host-rock elements controlled the intrusion of the Lower Zone, and to a lesser degree, the Critical Zone correlatives of the Bushveld Complex in the Northern Limb. During intrusion reverse faults and shear zones and a second generation of folds were active, as well as local extension along layering. Syn-magmatic deformation on these structures led to laterally extensive stratal thickening across them, including the Merensky-Reef correlative that forms part of the Flatreef. This deformation was likely to have been driven by subsidence of the Bushveld complex. Many of these structures were intruded by granitic magmas during the late stages of intrusion, and they were reactivated during extension after intrusion. Thus, structures were active before, during and after the intrusion of Northern Limb, and the structural evolution determined the current geometry and mineral endowment of the Flatreef.

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