Seismic properties and effects of hydrothermal alteration on Volcanogenic Massive Sulfide (VMS) deposits at the Lalor Lake in Manitoba, Canada

Miah, Khalid H.; Bellefleur, Gilles; Schetselaar, Ernst; Potter, David K.

doi:10.1016/j.jappgeo.2015.07.016

Cited by 9 publications

(4 citation statements)

References 27 publications

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“…The hydrothermal alteration associated at the VMS deposit is well-developed in the footwall rocks whereas rocks in the hanging wall are generally weakly altered or unaltered [73]. VMS deposits are thus genetically and spatially related to hydrothermal alteration process [74].…”

Section: Alterationmentioning

confidence: 98%

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

Pourkaseb¹,

Zarasvandi²,

Adelpour³

et al. 2017

Preprint

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The Divar VMS deposit is located in the Nehbandan ophiolite complex (NOC). It is hosted in the Sistan suture zone (SSZ) marking the boundary between the Lut and Afghan continental blocks. This area is composed mainly of various ophiolitic rock units representing a tectono-sedimentary mélange, which are commonly interpreted as being the remnants of Sistan oceanic lithosphere. The major host rocks cropping out in the Divar deposit are mantle peridotites include clinopyroxene-(cpx-) rich harzburgites and depleted harzburgites with gabbronorite, cumulate gabbro, basalt and pelagic sediments. They are interpreted as being related to the rifting and subsequent Late Triassic continental break-up of the southern Neothethys. In this study petrographic observations mineral chemistry with whole rock chemistry, and rare earth element (REE) modeling were carried out on the different rocks associated with Divar deposit. The presented data led to the following conclusions: (1) The depleted harzburgites proved to be related to the residual mantle after 18-22% removal of melts. This is comparable with abyssal peridotites; (2) The cpx-rich harzburgites represent the residual mantle after the removal of 11-13% mid-ocean ridge basalt-type (MORB). Subsequently, the residual mantle was enriched in light REE (LREE) by subduction-derived fluids; (3) The gabbronorite and cumulate gabbro represents a portion of oceanic crust generated in a mid-ocean ridge setting; (4) The basalts belong to the N-MORB-type with no considerable crustal contamination. From the top to bottom, the Divar deposit is characterized a gossan zone, a thick massive ore zone, and a poorly developed stockwork zone. In Divar deposit, host rocks are indicated by serpentinized peridotites and severely altered mafic rocks that include disseminated and stockwork ore under massive lenses. These rocks showed a mineral assemblage of carbonate + quartz-jasper + chlorite + albite + epidote that demonstrate greenschist facies ocean floor metamorphism. Moreover, in the footwall rocks, sericitization and hematitization are also observed. Primary mineralization includes bedded ore, sulphide breccias, stockworks and chimney fragments. Ore mineral abundances decrease from pyrite, magnetite, to chalcopyrite, and sphalerite. Highlightly, there are two distinct mineralization phases' namely massive sulphide (stage-1) and massive magnetite (stage-2). The spatial relationships with the host rocks and textural evidence (e.g., magnetite replacing sulphides) indicate that sulphide minerals and magnetite were generated in different stages. The transition from sulphide to magnetite mineralization is interpreted as being related to the variation of H2S content in the ore fluids. The massive sulphide ore (stage 1) might have formed by primary hydrothermal fluids enriched in H2S and Fe. The second stage (massive magnetite) seem to be related to the later hydrothermal fluids enriched in Fe but poor in H2S, replacing the pre-existing sulphide minerals. The lithological features (stockwork/massive or...

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Section: Alterationmentioning

confidence: 98%

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

Pourkaseb¹,

Zarasvandi²,

Adelpour³

et al. 2017

Preprint

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“…They have been performed on massive sulfide deposits on land, e.g. Salisbury et al (2000); Morgan (2012); Bellefleur et al (2012); Malehmir et al (2012;, Miah et al (2015). Miah et al (2015) showed that hydrothermal alteration considerably increas es Vp and density of altered argillite and felsic volcanic rocks in comparison to their corresponding unaltered facies.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

“…Salisbury et al (2000); Morgan (2012); Bellefleur et al (2012); Malehmir et al (2012;, Miah et al (2015). Miah et al (2015) showed that hydrothermal alteration considerably increas es Vp and density of altered argillite and felsic volcanic rocks in comparison to their corresponding unaltered facies. Malehmir et al (2014) showed that the host rock velocities increase from felsic to ultramafic rocks, with Vp velocity of 7.5km/sec for the Kevitsa main intrusion (mafic -ultramafic Ni-Cu-P GE deposit) and 6.5km/sec and 5.7km/sec for the Ventersdorp Supergro up lava and Central Rand Group quartzite respectively.…”

Section: Accepted Manuscriptmentioning

confidence: 99%

P-wave velocity measurements for preliminary assessments of the mineralization in seafloor massive sulfide mini-cores during drilling operations

Spagnoli

Weymer

Jegen

et al. 2017

Engineering Geology

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“…However, petrophysical studies at laboratory or borehole should be conducted prior the seismic acquisition. Apart from few published studies (Salinbury et al, 2000;Chopping, 2008;Duff et al, 2012;Malehmir et al, 2012a;and Miah et al, 2015), the elastic properties of hard-rocks are poorly understood, therefore this topic is one of several aspects pointed by Eaton et al (2003) and Malehmir et al (2012b) that require further research to increase the deployment of seismic in hard rock environment.…”

Section: Introductionmentioning

confidence: 99%

Ultrasonic wave velocities measurements and seismic anisotropy at Karari gold deposit: Implications for gold exploration

Eduardo¹,

Vialle²,

Bóna³

2019

ASEG Extended Abstracts

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Seismic properties and effects of hydrothermal alteration on Volcanogenic Massive Sulfide (VMS) deposits at the Lalor Lake in Manitoba, Canada

Cited by 9 publications

References 27 publications

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

Tectono-Magmatic Setting of the Divar Deposit, Eastern Iran: Evidences for VMS Mineralzation

P-wave velocity measurements for preliminary assessments of the mineralization in seafloor massive sulfide mini-cores during drilling operations

Ultrasonic wave velocities measurements and seismic anisotropy at Karari gold deposit: Implications for gold exploration

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