Where do we have seafloor massive sulfide deposits?
Almost all seafloor massive sulfide deposits have been found at the plate boundaries, where there is a strong spatial and temporal correlation between magmatism, seismicity, and high-temperature hydrothermal venting (Fig.
How are massive sulfide deposits formed?
Volcanogenic massive sulfide deposits are distinctive in that ore deposits are formed in close temporal association with submarine volcanism and are formed by hydrothermal circulation and exhalation of sulfides which are independent of sedimentary processes, which sets VMS deposits apart from sedimentary exhalative ( …
What are seafloor deposits?
Overview. The seafloor contains deposits of minerals that we we use in everyday life such as copper, zinc, nickel, gold, silver, and phosphorus. These deposits occur as crusts on volcanic and other rocks and as nodules on abyssal plain sediment that are typically about 3 to 10 centimeters (1 to 4 inches) in diameter.
What are the problems with mining metal sulfide deposits on the seafloor?
Assuming a worst-case scenario, negative impacts of mining on active or inactive sulphide systems were reported to include the loss of sulphide habitat, degradation of sulphide habitat quality, modification of fluid flux regimes, local, regional, or global extinction of endemic or rare taxa, decreased diversity at all …
What is the importance of sulfides to deep sea organisms?
At the seabed, hydrothermally active sulfides support dense communities of specially adapted invertebrate taxa that rely on bacterial chemoautotrophic primary productivity (Van Dover, 2000).
What are massive sulphides?
They consist of sulphur compounds, sulphides, which form massive deposits on the sea floor similar to cobalt crusts – thus the name. Massive sulphides originate at hot vents in the ocean where sulphide-enriched water flows out of the seabed. These sites of escaping hot water are called hydrothermal vents.
How are VMS deposits formed?
Over time, the continual activity of the smokers and their mineral rich plumes create mineralized beds that become VMS deposits. With the movement of the Earth’s tectonic plates, these mineral rich beds are transposed and can be found on land that was once underwater.
What rock is the seafloor made of?
Oceanic crust is about 6 km (4 miles) thick. It is composed of several layers, not including the overlying sediment. The topmost layer, about 500 metres (1,650 feet) thick, includes lavas made of basalt (that is, rock material consisting largely of plagioclase [feldspar] and pyroxene).
What is the international problem regarding mining on the ocean floor?
The most direct impacts at mining sites are destruction of natural land forms and the wildlife they host, compaction of the sea floor, and creation of sediment plumes that disrupt aquatic life. Nearby impacts include noise, electromagnetic effects, disruption of the larval supply, contamination and fluid flow changes.
What is the name of sulphide ore?
Sulfide ores are the ones which contain sulfide ion as the major anion. The ore from which this ion can be extracted is argentite which has a formula of (silver sulfide).
What is the difference between VMS and Sedex deposits?
VMS deposits are typically massive lens-shaped bodies, underlain by discordant vein mineralization and altered volcanic rocks. SEDEX deposits are finely layered massive sulfides interbedded with shale, siltstone, or sandstone, typical of deep marine turbidites.
What are VMS minerals?
A mineral is a naturally occurring inorganic element or compound having an orderly internal structure and characteristic chemical composition, crystal form, and physical properties. Common minerals include quartz, feldspar, mica, amphibole, olivine, and calcite.
How was the seafloor formed?
As plates converge, one plate may move under the other causing earthquakes, forming volcanoes, or creating deep ocean trenches. Where plates diverge from each other, molten magma flows upward between the plates, forming mid-ocean ridges, underwater volcanoes, hydrothermal vents, and new ocean floor crust.
Which minerals do we get from the ocean floor?
A Cobalt.
Which metal is currently mined from ocean floor?
The deep sea contains many different resources available for extraction, including silver, gold, copper, manganese, cobalt, and zinc. These raw materials are found in various forms on the sea floor.
Is seabed mining sustainable?
The potential value of deep seabed mining has been estimated at US$2-20 billion 1 — a fraction of the much more valuable sustainable ocean economy, which annually generates a conservatively estimated US$1.5-2.4 trillion, benefiting many states and coastal communities.
Is calamine is a sulphide ore?
Calamine is an ore of zinc.
What is SedEx ore deposits?
SedEx, or sedimentary exhalative deposits, are ore deposits formed when hydrothermal fluids enter a water reservoir, such as an ocean, and precipitate minerals. SedEx deposits are a major source of minerals including copper, silver , gold and tungsten – and the single most important source of lead and zinc .
What is a seafloor massive sulfide deposit?
Seafloor massive sulfide (SMS) deposits, also known as hydrothermal ore deposits or black smoker vents, form when a magmatic heat source drives the circulation of seawater through the ocean crust, where it leaches metals from the rocks. Metals may also be contributed by magmatic fluids that are degassing from the underlying magma chamber.
Can we mine hydrothermal vents and seafloor massive sulfides?
Discovery of hydrothermal vents and seafloor massive sulfides (SMS) that contain metals of economic importance due to their high concentrations has generated significant interest among researchers as well as entrepreneurs as an alternative source that can be mined in future.
What are volcanic-hosted massive sulfide deposits?
These deposits are modern analogs of ancient volcanic-hosted massive sulfide (VMS) deposits, which have been a mainstay of the Canadian mining industry, and are shedding new light on the relationships between tectonics, volcanism, and hydrothermal activity that are fundamental to successful land-based exploration.
How are sulphuric acid deposits formed?
SMS deposits form in the deep ocean around submarine volcanic arcs, where hydrothermal vents exhale sulfide-rich mineralising fluids into the ocean.