Patterns of faulting in the Mont Blanc granite

Bertini, G.; Marcucci, M.; Nevini, R.; Passerini, Pietro; Sguazzoni, G.

doi:10.1016/0040-1951(85)90066-6

Cited by 33 publications

(24 citation statements)

References 7 publications

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“…The present work complements the data of Bertini et al (1985), confirming that the shear-zone network was formed in a N W -S E horizontal compression and vertical extension context. We show that this deformation is mainly accommodated by a complex network of N E -S W partly dextral and N -S partly sinistral shear zones, the N E -S W component being the dominant one.…”

Section: Discussionsupporting

confidence: 93%

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Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

Rossi

Rolland²,

Vidal

et al. 2005

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This paper highlights the relationships between the formation of shear zones, associated quartz-rich veins and their quartz-depleted alteration haloes ('episyenites') that have formed in the Mont Blanc Massif during the Alpine orogeny. The shear zones are steeply dipping and formed late (18-13 Ma) during collisional orogeny, at mid-crustal depths (5 + 1 kbar, 400 + 50 ~ during uplift of the Mont Blanc Massif. Between the shear zones, nearly undeformed granite contains widely dispersed, subhorizontal veins with a quartz-dominant quartz + albite + chlorite + adularia assemblage. They do not intersect the shear zones and are surrounded by quartz-depleted alteration haloes up to several metres wide. The compositions of the shear zones and the vein-alteration haloes (episyenites) show substantial departures from the bulk composition of the host rock. Shear zones are characterized by greenschist facies assemblages (epidote-, chlorite-or K-white-micabearing assemblages). Each shear zone type is featured by a specific chemical change: depletions in K20, and enrichments in Fe203 and CaO (epidote-); with depletions in CaO, Na20, K20 and slight SiO2 enrichments (white mica-chlorite-); with depletions in SiO2, CaO, Na20, K20 and enrichments in MgO (phlogopite-chlorite shear zones). Episyenites are characterized by chemically induced porosity enhancement due to dissolution of magmatic quartz and biotite, with subsequent partial infilling of pore spaces by quartz, chlorite, albite and adularia. The vein arrays have accommodated minor vertical stretching in the Mont Blanc Massif, probably at the same time as the adjacent shear zones were accommodating more substantial vertical stretching in the massif. Coupled quartz dissolution in the wallrock alteration haloes and quartz precipitation in veins could be interpreted to reflect local mass transfer between wallrock and veins during essentially closed-system behaviour in the relatively undeformed granite domains between shear zones. In contrast, shear zones probably develop in opened systems due to their kilometric length.Studies of fluid-rock interaction processes during deformation in metamorphic rock provide insights about fluid circulation in the middle-lower continental crust. It also provides constraints to estimate the magnitude of mass transfer during orogenic events. Mass balance calculations during fluid-rock interaction are easier when based on rocks of homogeneous composition at regional scale. This is rather common in many granitic massifs and therefore granitic rocks are good candidates for such studies.In metamorphosed granites, fluid-rock interactions are mainly localized along shear zones,

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Section: Discussionsupporting

confidence: 93%

“…At the regional scale, in a NW-SE section of the MBM, the shear zones oriented N40~E are arranged in a fan-like geometry (Fig. 3), which define a pop-up structure with divergent NWand SE-directed thrusting of the crystalline basement over its Helvetic cover (Antoine et al 1975;Bertini et al 1985;Butler 1985;Belli~re 1988).…”

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confidence: 99%

Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

Rossi

Rolland²,

Vidal

et al. 2005

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“…Since the hyperfine signals are broader in Co(II)St with respect to Co(I1) azurin, due to the higher molecular weight of the title protein, these experiments are more difficult to perform. In spite of the large linewidths of these signals, we have been able to detect some [15][16][17][18] dipolar connectivities arising from them. Signals E,I and G,H were shown to be dipolarly connected pairwise (Fig.…”

Section: Resultsmentioning

confidence: 88%

“…Metal substitution has proven to be a helpful tool for probing metal sites in metalloproteins [17]. In particular, when Co(I1) and Ni(I1) replace copper, the NMR signals of nuclei belonging to the metal ligands display considerably larger shifts and linewidths but can still be detected and assigned [18,19].…”

Section: Introductionmentioning

confidence: 99%

A ¹H NMR NOE study on Co(II) stellacyanin: Some clues about the structure of the metal site

Vila

1994

FEBS Letters

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The 'H NMR spectrum of Co(H) stellacyanin is reported, in which four signals not previously observed have been detected. NOE experiments were performed to assign the hyperfine shifted signals corresponding to a Cys and two His residues. Both His residues are solventaccessible and are shown to bind the metal ion through their NJ1 atoms. The j?-CH, Cys proton shifts indicate the presence of a strong axial ligand.

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“…The massif is composed by a granitic batholith and related aplitic veins intruded into a metamorphic basement. Subvertical faults and shear zones have a fan-like arrangement (Bertini et al, 1985) and determine the distribution of the large spurs of massive granite and the main couloirs. At a larger scale, tectonic phases have broken up the rock with multiple planes and fractures with highly variable direction and density.…”

Section: The Morphodynamics Of the Mont Blanc Massifmentioning

confidence: 99%

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

Magnin

Westermann

Pogliotti

et al. 2017

CATENA

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Patterns of faulting in the Mont Blanc granite

Cited by 33 publications

References 7 publications

Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

A ¹H NMR NOE study on Co(II) stellacyanin: Some clues about the structure of the metal site

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

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Patterns of faulting in the Mont Blanc granite

Cited by 33 publications

References 7 publications

Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

Geochemical variations and element transfer during shear-zone development and related episyenites at middle crust depths: insights from the Mont Blanc granite (French — Italian Alps)

A 1H NMR NOE study on Co(II) stellacyanin: Some clues about the structure of the metal site

Snow control on active layer thickness in steep alpine rock walls (Aiguille du Midi, 3842ma.s.l., Mont Blanc massif)

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A ¹H NMR NOE study on Co(II) stellacyanin: Some clues about the structure of the metal site