Process of serpentinization in the ultramafic massif of Beni Bousera (internal Rif, Morocco)

Hajjar, Zaineb; Wafik, Amina; Constantin, Marc; Bhilisse, Mohamed

doi:10.1007/s12517-016-2507-6

Cited by 5 publications

(5 citation statements)

References 26 publications

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“…The Raman spectra of polygonal serpentine were first reported by Lemaire (1999) and then Auzende et al (2004) who both identified a unique peak at 3,697 cm −1 with a shoulder at 3,689 cm −1 and a broad secondary peak at 3,646 cm −1 . These publications have since served as a reference for identification of polygonal serpentine on the basis of its Raman spectrum . However, there remains some degree of uncertainty with regard to the Raman signal of polygonal serpentine.…”

Section: Introductionmentioning

confidence: 98%

“…However, there remains some degree of uncertainty with regard to the Raman signal of polygonal serpentine. Specifically, some authors have been unable to differentiate polygonal serpentine from chrysotile or a mixture of lizardite and chrysotile …”

Section: Introductionmentioning

confidence: 99%

“…[13,17] These publications have since served as a reference for identification of polygonal serpentine on the basis of its Raman spectrum. [18][19][20][21][22] However, there remains some degree of uncertainty with regard to the Raman signal of polygonal serpentine. Specifically, some authors have been unable to differentiate polygonal serpentine from chrysotile or a mixture of lizardite and chrysotile.…”

mentioning

confidence: 99%

“…Specifically, some authors have been unable to differentiate polygonal serpentine from chrysotile or a mixture of lizardite and chrysotile. [20,21] To address whether polygonal serpentine has a distinct Raman spectrum, we performed high-spatial resolution Raman mapping using methods recently introduced by Rooney et al, which allow for mapping at near diffraction-limited resolution (~370 nm). [15] Raman mapping was performed directly on electron-transparent regions of serpentinite samples that were characterized in detail using transmission electron microscopy (TEM).…”

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confidence: 99%

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Distinguishing the Raman spectrum of polygonal serpentine

Tarling

Rooney

Viti

et al. 2018

J Raman Spectroscopy

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Positively identifying serpentine mineral types is important for a wide range of disciplines in the Earth sciences and health sciences. Although Raman spectroscopy has been widely applied as a tool to distinguish four of the main serpentine minerals (i.e., antigorite, lizardite, chrysotile, and polygonal serpentine), some uncertainty remains as to whether all four varieties have unique Raman spectra. In this paper, submicron Raman spectroscopy mapping was performed directly on electron‐transparent regions of serpentine samples that were unambiguously identified by transmission electron microscopy (TEM). The increased spatial resolution of the Raman mapping technique (~370 nm), combined with the detailed characterization provided by TEM, indicates that polygonal serpentine has the same Raman spectrum as lizardite and therefore cannot be spectrally distinguished from lizardite. Furthermore, the Raman spectral profile that has previously been reported as unique to polygonal serpentine is likely to represent a mixture of chrysotile and polygonal serpentine/lizardite. To positively discriminate between lizardite and polygonal serpentine requires TEM investigation.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Distinguishing the Raman spectrum of polygonal serpentine

Tarling

Rooney

Viti

et al. 2018

J Raman Spectroscopy

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“…These intrusions induced local alteration of the ultramafic rocks (Hajjar et al, 2017). Strong serpentinization of the peridotites, followed by magnesite precipitation, is linked to fluid circulations that occur preferentially along the Aaraben fault (Hajjar et al, 2015(Hajjar et al, , 2016. The emplacement and the cooling of the granitic dykes are constrained at circa 22 Ma using 40 Ar-39 Ar on biotite and muscovite together with the U-Th-Pb method on zircon and monazite from the granite dykes (Rossetti et al, 2013).…”

Section: Geological Settingmentioning

confidence: 99%

Neogene polyphase deformation related to the Alboran Basin evolution: new insights for the Beni Bousera massif (Internal Rif, Morocco)

Bakili¹,

Corsini²,

Chaloüan³

et al. 2020

BSGF - Earth Sci. Bull.

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Located in the Internal domain of the Rif belt, the Beni Bousera massif is characterized by a stack of peridotites and crustal metamorphic units. The massif is intruded by granitic dykes and affected by several normal ductile shear zones. Structural, petrological and 40 Ar-39 Ar dating analyses performed on these two elements highlight that (1) the granitic dykes are emplaced within major N70°to N140°trending normal faults and shear zones, resulted from an NNE-SSW extension (2) the Aaraben fault in its NE part is characterized by N70°to N150°trending ductile normal shear zones, resulted from a nearly N-S extension and (3) the age of this extensional event is comprised between 22 and 20 Ma. Available paleomagnetic data allow a restoration of the initial orientation of extension, which was nearly E-W contemporary with the Alboran Basin opening in back-arc context, during the Early Miocene. At the onset of the extension, the peridotites were somehow lying upon a partially melted continental crust, and exhumed during this event by the Aaraben Normal Shear Zone. Afterward, the Alboran Domain suffered several compressional events.

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