sedimentary deposits - search results

(PDF) Economic Geology - Sedimentary ore deposits

Sedimentary placer deposits are mecha nically formed concentrations of h e a v y, durable minerals that may occur in transp orted soil or regolith (colluvia l), in. fluviatile and in coastal ...

Glaciofluvial, lacustrine, and pediment sedimentary deposits

Glaciofluvial, lacustrine, and pediment sedimentary deposits. XML. JSON. Unconsolidated, poorly sorted silt, sand, and gravel. Includes lacustrine deposits west of Columbia River Gorge (Trimble, 1963). Mostly in northern Morrow and Umatilla Counties where unit represents deposits of swollen late Pleistocene Columbia River (Hogenson, 1964)

(PDF) Sedimentary Manganese and Iron Ore Deposits

(Sedimentary ir on ore deposit is a very limi ted occurrence, being f ound only in the 2 localities in the W estern Desert and one locality in Sinai) and ii) The Prec ambrian Banded Iron ore ...

Sedimentary Mineral Deposits - Mineral Processing & …

The great sedimentary deposits of low-grade siliceous iron ores found in the Lake Superior region and in other parts of Ontario, were laid down in preCambrian time. In British Columbia, there was a long period of igneous activity in late Jurassic and early Cretaceous times, the result of which was the great granitic intrusion of the Coast Range ...

SEDIMENTARY ORE DEPOSITS

SEDIMENTARY ORE DEPOSITS. Commercial deposits of metals come in a seemingly endless variety formed by many different geological processes. Successful exploration for these accumulations, now that most of those easily spotted on the surface have been …

Sedimentary | Definition of Sedimentary by Merriam-Webster

Sedimentary definition is - of, relating to, or containing sediment. How to use sedimentary in a sentence.

Sedimentary Exhalative Deposits | Nasdaq

Sedimentary Exhalative Deposits. SedEx, or sedimentary exhalative deposits, are ore deposits formed when hydrothermal fluids enter a water reservoir, such as …

Copper Deposits in Sedimentary and Volcanogenic Rocks

Copper deposits occur in sedimentary and volcanogenic rocks within a wide variety of geologic environments where there may be little or no evidence of hydrothermal alteration. Some deposits may be hypogene and have a deep-seated source for the ore fluids, but because of rapid cooling and dilution during syngenetic deposition on the ocean floor, the resulting deposits are not associated with ...

Sedimentary Mars | Science Mission Directorate

"The finding of layered sedimentary deposits is something that biologists have been hoping for," said Dr. Ken Nealson, director of the Center for Life Detection at NASA's Jet Propulsion Laboratory (JPL), Pasadena, CA. "Perhaps the favorite sites for biologists to search for fossils or evidence of past life on Earth are layered lake or oceanic ...

Sedimentary Deposits | Article about Sedimentary Deposits ...

The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased. Sedimentary Deposits mineral deposits formed during the accumulation of sediment on the bottom of rivers and other bodies of water. According to their place of formation they are divided into river, swamp, lake, sea, and ocean deposits ...

Locations of Deposits

Mineral deposits form in a variety of complex geologic settings such as continental magmatic arcs, sedimentary basins, and evaporite deposits. The occurrence of a REE-enriched mineral does not necessarily correlate with economic feasibility of mining that mineral deposit; mining companies must also look at ore grade of the deposit to determine ...

Sedimentary Copper Deposits | INN

Sedimentary deposits are generally tabular, sheet-like or flat lenticular form. They are horizontal if not disturbed, but are frequently folded and faulted. Beds containing metallic ore are ...

Glacial Sedimentary Environments and Deposits - ISGS

Glacial Sedimentary Environments and Deposits ... Till is the most common subglacial deposit, but river and lake deposits also occur in channels and cavities beneath glaciers. When the glacier melts away lenses and pockets of water-sorted material are left within layers of till.

A search of sedimentary deposits that span the boundary ...

A search of sedimentary deposits that span the boundary between the Cretaceous and Tertiary periods shows that there is a dramatic increase in the abundance of iridium briefly and precisely at this boundary. （""）。 ...

Sedimentary Rocks | National Geographic Society

Sedimentary rocks are formed on or near the Earth's surface, in contrast to metamorphic and igneous rocks, which are formed deep within the Earth. The most important geological processes that lead to the creation of sedimentary rocks are erosion, …

Sedimentary rock - Wikipedia

Sedimentary rocks are types of rock that are formed by the accumulation or deposition of mineral or organic particles at Earth's surface, followed by cementation. Sedimentation is the collective name for processes that cause these particles to settle in place. The particles that form a sedimentary rock are called sediment, and may be composed of geological detritus (minerals) or biological ...

Sedimentary deposits news and latest updates

Sedimentary deposits tell a story about how the Earth responded to a changing climate in the past and are an important tool for predicting what climate change will mean for the future. A new study ...

Volcanogenic Sedimentary Deposits | Article about ...

Volcanogenic sedimentary deposits include large stratified deposits of iron and manganese ores composed of silicates, carbonates, oxides, and hydroxides of the above metals, as well as pyrite ores containing sulfide compounds of iron, copper, and zinc and occasionally lead, barite, and gypsum. Certain investigators believe that some phosphorite ...

Economic geology - Sedimentary ore deposits

Sedimentary ore formation will almost always have a biogenic component. In some cases this is very obvious, for example in phosphate deposits made of bones and coprolites, or a lignite seam composed of. 5. 1-Black shales in metallogenesis Carbonaceous shales are important host rocks of sedimentary ore deposits.

GEOLOGY OF SEDIMENTARY ROCK-HOSTED GOLD …

sedimentary rock-hosted gold deposits in P.R. China. These breccia bodies are conformable with stratigraphic units in the host rock. An example of this is the Shuangwang gold deposit (Fan, S.C. and Jin, Q.H., 1994), which is a large Carlin-type gold deposit in the Qinling area,

GEOL342 - Sedimentation and Stratigraphy

The most proximal (close to sediment source) and coarse grained of water-transported sedimentary environments is the alluvial fan. These cone shaped deposits form where high gradient narrow canyon streams disgorge onto flat plains at the mouths of canyons. At this point, streams typically lose the competence to transport framework clasts. Note, when applied to a stream:

Geology of Gemstone Deposits — Gemstones and Sustainable ...

Sedimentary rocks; Primary Gemstone Deposits. The gemstones are found in their original host-rock. The profitability of such a deposit is highly dependent from the concentration of gemstones (per ton of rock) and the weathering stage of the host-rock. A lot of large-scale diamond mining operations work primary kimberlite deposits in the search ...

GEOL342 - Sedimentation and Stratigraphy

Primary sedimentary structures: occur in clastic sediments and produced by the same processes (currents, etc.) that caused deposition. Includes plane bedding and cross-bedding. Secondary sedimentary structures: are caused by post-depositional processes, including biogenic, chemical, and mechanical disruption of sediment.

Layers of Sedimentary Rock Deposited by Global Flood ...

The three observed examples described above demonstrate that local-regional natural catastrophes do deposit neat, uniform sedimentary rock layers, even though in most instances the flow of water and air respectively was rapid and sometimes turbulent (churning). It should also be noticed that in two of the three examples the surging, fast-moving ...

Sedimentary Exhalative Deposits | INN

Sedimentary Exhalative Deposits Investing News Network - March 31st, 2011 SedEx deposits are a major source of minerals including copper, silver, gold and tungsten- and the single most important ...

Sedimentary deposits Flashcards | Quizlet

placer deposits. surface deposits formed by the sedimentary processes of weathering, erosion, transport and deposition. Dense, physically and chemically resistant minerals including cassiterite (tin ore), gold and diamonds can be concentrated by these processes into usually small, but high grade, ore deposits.

Chapter 11 SEDIMENTARY BASINS - MIT OpenCourseWare

is sedimentary. 1.3 As with most blanket statements, the one above has exceptions to it. A sedimentary basin can be made just by erecting high land in an adjacent area by volcanism. 1.4 The term "sedimentary basin" is usually not applied to relatively thin and very extensive deposits of sandstone, limestone, and shale from epicontinental

sedimentary rock | Definition, Formation, Examples ...

Orthochemical sedimentary rocks include some limestones, bedded evaporite deposits of halite, gypsum, and anhydrite, and banded iron formations. Sediments and sedimentary rocks are confined to Earth's crust, which is the thin, light outer solid skin of Earth ranging in thickness from 40–100 kilometres (25 to 62 miles) in the continental ...

Sedimentary ore deposit environments - SlideShare

36 Sedimentary Ore Deposits The term sedimentary mineral deposits is applied to any local concentration of minerals formed through processes of sedimentation. One form of sedimentation is the precipitation of substances carried in solution.

Sedimentary exhalative deposits - Wikipedia

Sedimentary exhalative deposits (SedEx or SEDEX deposits) are zinc-lead deposits originally interpreted to have been formed by discharge of metal-bearing basinal fluids onto the seafloor resulting in the precipitation of mainly stratiform ore, often with thin laminations of sulphide minerals. SEDEX deposits are hosted largely by clastic rocks deposited in intracontinental rifts or failed rift ...