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Showing 1 to 5 of 5 for “"Alteration halo"”.
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Post-depositional alteration of the Ventersdorp Contact Reef at Vaal Reef no. 10 shaft, Klerksdorp Goldfield
… Ventersdorp Supergroup. Three post-depositional alteration events, which form an alteration halo in the footwall and hangjngwall rocks around the VCR, can be recognised. The first of these alteration events is attributed to regional metamorphism and is identified by the formation of pyrophyllite …
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Petrology of the Cenozoic igneous rocks of the Tinton district, Black Hills, South Dakota - Wyoming
… pyroxenite magma.</p> <p>Late-stage hydrothermal alteration affected all rocks in the Tinton district. A classic alteration halo was observed with progressive intensity of sericitic, propylitic, and pyritic alteration toward the center of the uplift accompanied by intrusive breccia. The chemistry, …
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Deciphering the signature of fluid/rock reactions in the lower oceanic crust: The Oman ophiolite analogue
… record of fluid circulation reveals that alteration occurred mostly under greenschist facies conditions and continued down to prehnite-pumpellyite facies. However, the textural characteristics of amphibole-rich fault zones imply an earlier, high temperature stage of deformation. The …
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Petrology, geochemistry, stable and radiogenetic isotopy of the Guelb Moghrein iron oxide copper gold cobalt deposit, Mauritania
… ca. 40 m wide biotitechlorite- grunerite-calcite alteration halo developed during hydrothermal alteration. The bulk of the alteration assemblage occurs in the recrystallized feldspar matrix; however this zone is not significantly mineralized. Towards the ore bodies, the …
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Recognising cryptic alteration surrounding the Mount Isa Copper Deposits: Implications for controls on fluid flow, and mineral exploration
This study investigated cryptic alteration haloes associated with copper mineralisation at Mount Isa, Northwest Queensland, Australia. New insights from hydrothermal alteration were used to constrain aspects of hydrothermal fluid flow and fluid-rock interactions that occurred as part of the …