Mise en place syntectonique des minéralisations cuprifères du gı̂te d'Ifri (district du Haut Seksaoua, Haut Atlas occidental, Maroc)

Gaouzi, Abdelaziz; Chauvet, Alain; Barbanson, Luc; Badra, Lakhlifi; Touray, Jean-Claude; Oukarou, Saı̈d; Wartiti, M. El

doi:10.1016/s1251-8050(01)01631-7

Cited by 6 publications

(7 citation statements)

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“…Hence the disseminated style of mineralization was rapidly followed by the Late Carboniferous compression and the onset of the vein-style mineralization. On this basis, it appears that copper mineralization of Tizert is largely a Paleozoic event, most likely of Carboniferous age, contemporaneous with the polymetallic sulphide mineralization event in the Moroccan Meseta [82][83][84][85][86][87].…”

Section: Timing Of Mineralization and Genetic Processesmentioning

confidence: 98%

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

et al. 2017

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The Tizert Cu-Ag deposit is the largest of a series of sediment-hosted copper deposits of the Anti-Atlas copper province in Morocco. Mineralized rocks in the deposit contain disseminated sulphides within a Late Ediacaran, dominantly siliciclastic sedimentary formation named the Basal Series. Isopach map of the Basal Series thickness shows that during the Late Ediacaran the area was composed of large subsiding zones separated by paleohighs. The ore-grade zones are well developed along basin margins adjacent to the basement paleohighs. These mineralized zones display a lateral sulphide zoning with central bornite-chalcocite zones grading outward to intermediate chalcopyrite and external pyrite zones. There is also a vertical sulphide zoning with evolution from bornite and chalcocite dominant mineralized rocks at the bottom to chalcopyrite and pyrite dominant mineralized rocks at the top of the lithostratigraphic succession. A second style of mineralization is represented by sulphide filled fractures and veins present in the Basal Series, as well as in the basement and the overlying dolomites. The similarity of the paragenetic sequences between the disseminated and the vein-hosted mineralization suggests that they may be related to the same mineralizing event, the disseminated style of mineralization being rapidly followed by the onset of the vein-style mineralization.

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Section: Timing Of Mineralization and Genetic Processesmentioning

confidence: 98%

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

et al. 2017

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“…The association of these elements reflect the selective leaching of K-feldspar. On a regional scale, the Bouznika deposit shares many similarities with the Talmakent deposit in the Seksaoua area of the Western Upper Atlas Mountains (Rchid et al, 1996;Azza, 1998;Gaouzi et al, 2001;Chauvet et al, 2002;Barbanson et al, 2003), where a barite horizon is hosted by a bimodal plutonic and volcanic complex at the Georgian-Acadian transition. The 70-m thick volcanic assemblage includes lapilli tuffs and carbonate units.…”

Section: Discussionmentioning

confidence: 98%

“…This suggests mud flow deposition and localized reworking of the sediments by streams. Thin sections reveal fresh oligoclase phenocrysts exhibiting oriented trachytic texture in a glassy, chlorite-rich Jaillard, 1993;Rchid et al, 1996;Gaouzi et al, 2001;Chauvet et al, 2002;Barbanson et al, 2003 matrix. Sericite accompanied by apatite and epidote are present as accessory minerals.…”

Section: Lower Volcanic Rocksmentioning

confidence: 99%

The Bouznika Cambrian barite deposit (Morocco), an early mineralization on the Iapetus margin

Jébrak¹,

Wartiti²,

Marcoux

et al. 2011

Journal of African Earth Sciences

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“…The existence of stratiform masses of pyrite first suggests that this deposit can be a VHMS (Figure 9a) [49]. However, copper mineralisation, the first economic goal, is absent from the stratiform pyrite levels but systematically localised close to the dolomite/black schist contact in which a top-to-the-N-NW décollement-type tectonics [50,51] has been identified ( Figure 9b). The economic mineralisation is a syntectonic stockwork (Figure 9c,d) formed in response to this top-to-the-N-NW shearing event that only affects the black schist layers (Figure 9).…”

Section: The Moroccan Palaeozoic High-atlas Examplementioning

confidence: 99%

Structural Control of Ore Deposits: The Role of Pre-Existing Structures on the Formation of Mineralised Vein Systems

Chauvet

2019

Minerals

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The major role played by pre-existing structures in the formation of vein-style mineral deposits is demonstrated with several examples. The control of a pre-existing decollement level on the formation of a crustal extension-related (collapse) gold deposit is first illustrated in the Quadrilátero Ferrífero from Brazil. Shear zone and decollement structures were also examined and shown to control veins formation by three distinct processes: (i) re-aperture and re-using of wrench shear zones in the case of Shila gold mines (south Peru); (ii) remobilisation of metal in volcanic-hosted massive sulphide (VHMS) deposit by subsequent tectonic events and formation of a secondary stockwork controlled by structures created during this event (Iberian Pyrite Belt, Spain); (iii) formation of economic stockwork by contrasting deformation behaviours between ductile black schist versus brittle more competent dolomite (Cu-Ifri deposit, Morocco). Two examples involve changing of rheological competence within zones affected by deformation and/or alteration in order to receive the mineralisation (case studies of Achmmach, Morocco, and Mina Soriana, Spain). The last case underscores the significance of the magmatic-hydrothermal transition in the formation of mesothermal gold deposits (Bruès mine, Spain). All these examples clearly demonstrate the crucial role played by previously formed structures and/or texture in the development and formation of ore deposits.Minerals 2019, 9, 56 2 of 22 improve mining exploration strategies. I will present and discuss seven case studies of metal-bearing veins with different modes of formation that highlight the role of pre-existing features on their development. This aspect seems to be frequently underestimated, at least in the case of vein deposits, and this work aims to demonstrate its significance in the development of exploration and exploitation programs. The re-using of some previously formed structures has, in that case, a significant but passive role with respect to the formation of the economic feature. This concept is already exemplified in another contribution of this volume [18]. Each of the seven cases presented herein include a brief overview of the regional geology and deformation history, followed by a detailed geometrical and textural analysis of ore-bearing veins and a regional-scale genetic model that integrates these data. The relationships between neo-formed structures versus pre-existing ones will be highlighted in each case as well as its implications for regional vein distribution and, consequently, exploration programs.

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Mise en place syntectonique des minéralisations cuprifères du gı̂te d'Ifri (district du Haut Seksaoua, Haut Atlas occidental, Maroc)

Cited by 6 publications

References 2 publications

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

Geology and Metallogenesis of the Sediment-Hosted Cu-Ag Deposit of Tizert (Igherm Inlier, Anti-Atlas Copperbelt, Morocco)

The Bouznika Cambrian barite deposit (Morocco), an early mineralization on the Iapetus margin

Structural Control of Ore Deposits: The Role of Pre-Existing Structures on the Formation of Mineralised Vein Systems

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