Magmatic--hydrothermal origin of Nevada`s Carlin
... release of fluid and magma during faulting is supported by leucocratic cupola zones and porphyry roof dykes in the Harrison Pass pluton26 and the numerous syn-ore dykes in the Carlin trend2,3 and at Cortez4 . We emphasize that tapping of fluids from magma bodies at ∼10 km is significantly deeper tha ...
... release of fluid and magma during faulting is supported by leucocratic cupola zones and porphyry roof dykes in the Harrison Pass pluton26 and the numerous syn-ore dykes in the Carlin trend2,3 and at Cortez4 . We emphasize that tapping of fluids from magma bodies at ∼10 km is significantly deeper tha ...
Sample pages 2 PDF
... Ti, and cassiterite, the ore of Sn. Other ore metals become concentrated in the water-rich fluid that separates from the silicate liquid, to be redeposited in pegmatites or in hydrothermal ore bodies. Pegmatites and carbonatites are important sources of rare but increasingly important metals such as ...
... Ti, and cassiterite, the ore of Sn. Other ore metals become concentrated in the water-rich fluid that separates from the silicate liquid, to be redeposited in pegmatites or in hydrothermal ore bodies. Pegmatites and carbonatites are important sources of rare but increasingly important metals such as ...
The district is situated in a complex zone of intrusions on the
... dykes in the central and northernparts of the district. Mafic dykes up to 5 m wide are generallythe youngestintrusiverocks intruding all lithologies exceptfor somequartzphyricrhyolite dykes. The geologicalstructureof the district is complexowing to the close proximity of intersectingregional fault t ...
... dykes in the central and northernparts of the district. Mafic dykes up to 5 m wide are generallythe youngestintrusiverocks intruding all lithologies exceptfor somequartzphyricrhyolite dykes. The geologicalstructureof the district is complexowing to the close proximity of intersectingregional fault t ...
Sedimentary Phosphate Deposits Mineral Deposit Profile F07
... phosphorites form in or laterally adjacent to organic-rich sediments beneath regions where upwelling, nutrient-rich, cold waters interact with a warm sunlit surface seawater layer, creating favourable conditions for intense algal bloom. Algae die, or are eaten by other life forms, then accumulate on ...
... phosphorites form in or laterally adjacent to organic-rich sediments beneath regions where upwelling, nutrient-rich, cold waters interact with a warm sunlit surface seawater layer, creating favourable conditions for intense algal bloom. Algae die, or are eaten by other life forms, then accumulate on ...
Carlin-type gold deposits are world-class gold producers and their
... periods of alternating compression and extension and were reactivated several times to guide ore-bearing fluids into the perfect environment for deposition of large Carlin-type gold deposits. Fluids that ponded beneath Upper Plate rocks within Lower Plate rocks of porous iron-rich limestones soaked ...
... periods of alternating compression and extension and were reactivated several times to guide ore-bearing fluids into the perfect environment for deposition of large Carlin-type gold deposits. Fluids that ponded beneath Upper Plate rocks within Lower Plate rocks of porous iron-rich limestones soaked ...
manganese mineralisation in metamorphic terrains, case study
... Nairobi. The main ore from which the manganese minerals in Nguuni area occur is of the Psilomelane type. These ores are often found in bedded deposits and clays. Since metamorphic terrains are often areas which were initially of sedimentary or volcanic origin before being acted upon by P/T condition ...
... Nairobi. The main ore from which the manganese minerals in Nguuni area occur is of the Psilomelane type. These ores are often found in bedded deposits and clays. Since metamorphic terrains are often areas which were initially of sedimentary or volcanic origin before being acted upon by P/T condition ...
Homework 3
... with a high content of dissolved gases flows more readily (less viscous) than one with a lesser amount of gases…” But on page 90, it is claimed that “In highly viscous, felsic magma, expansion is ...
... with a high content of dissolved gases flows more readily (less viscous) than one with a lesser amount of gases…” But on page 90, it is claimed that “In highly viscous, felsic magma, expansion is ...
Sedimentary Rocks 1
... mineral compositions and/or lithic clasts; Mature sedimentary rocks have restricted mineralogies dominated by mineral species resistant to weathering and erosional processes ...
... mineral compositions and/or lithic clasts; Mature sedimentary rocks have restricted mineralogies dominated by mineral species resistant to weathering and erosional processes ...
Volcano-tectonic control of ore deposits, southwestern New Mexico
... Figures 1 and 2: the intensely altered rocks and mafic to intermediate intrusions near the mouth of the Gila Canyon northeast of the village of Gila, and an area of felsic dikes, skarn, and widespread hornfels in the Sierra Rica. Mid-Tertiary volcanic rocks are associated with mineral deposits all o ...
... Figures 1 and 2: the intensely altered rocks and mafic to intermediate intrusions near the mouth of the Gila Canyon northeast of the village of Gila, and an area of felsic dikes, skarn, and widespread hornfels in the Sierra Rica. Mid-Tertiary volcanic rocks are associated with mineral deposits all o ...
Formation of Arizona Minerals through Geologic Time Jan C
... as the Bisbee Group. A mid-Cretaceous shallow seaway transgressed from the southeast, depositing the Mural Limestone, which is a source of limestone for cement at Paul Spur east of Bisbee. Coal deposits formed in northern Arizona in the Black Mesa basin. The Laramide orogeny (85 – 43 Ma) (Late Cret ...
... as the Bisbee Group. A mid-Cretaceous shallow seaway transgressed from the southeast, depositing the Mural Limestone, which is a source of limestone for cement at Paul Spur east of Bisbee. Coal deposits formed in northern Arizona in the Black Mesa basin. The Laramide orogeny (85 – 43 Ma) (Late Cret ...
chapter 14
... 14-1 What are the earth’s major geological processes and hazards? A. The earth is made up of a core, ____________, and crust and is constantly changing as a result of processes taking place on and __________ its surface. ______________ is the study of dynamic processes occurring on the earth’s surfa ...
... 14-1 What are the earth’s major geological processes and hazards? A. The earth is made up of a core, ____________, and crust and is constantly changing as a result of processes taking place on and __________ its surface. ______________ is the study of dynamic processes occurring on the earth’s surfa ...
mineral appraisal of certain alaska national interest lands, proposed
... mineralization in the Jurassic intrusives. Mesozoic-Paleozoic Volcanics and Sediments "Volcanogenic" types of deposits originally formed by ejection of ore solutions onto the ocean floor may be found in the study region. ...
... mineralization in the Jurassic intrusives. Mesozoic-Paleozoic Volcanics and Sediments "Volcanogenic" types of deposits originally formed by ejection of ore solutions onto the ocean floor may be found in the study region. ...
Ch 6 ppt
... • Windblown dunes are typically composed – of well-sorted, well-rounded sand – with cross-beds meters to tens of meters high – land-dwelling plants and animals make up any ...
... • Windblown dunes are typically composed – of well-sorted, well-rounded sand – with cross-beds meters to tens of meters high – land-dwelling plants and animals make up any ...
1 Sedimentary Facies and Structures 10-13
... Onlap—strata that pinch-out up onto a surface Offlap—strata pinching out down on a surface Channels—erosion surfaces that are half-moon shaped with erosional bases Reefs—organic build-ups that interfinger with fine-grained sediments; these can be wave-resistant structures or can form below the depth ...
... Onlap—strata that pinch-out up onto a surface Offlap—strata pinching out down on a surface Channels—erosion surfaces that are half-moon shaped with erosional bases Reefs—organic build-ups that interfinger with fine-grained sediments; these can be wave-resistant structures or can form below the depth ...
Early Paleozoic - This Old Earth
... Pennsylvanian collision joins Gondwanna Land and Laurussia (Hercynian in Europe, the Alleghenian in N. ...
... Pennsylvanian collision joins Gondwanna Land and Laurussia (Hercynian in Europe, the Alleghenian in N. ...
Sedimentary Rocks I. Sedimentary rocks
... • b. Organic rocks, usually coal (from plants) and various limestones with shell fragments. • ex. Coquina (fossil shells cemented together;) and Chalk (made of microscopic planktonic organisms; fizzes readily in acid) ...
... • b. Organic rocks, usually coal (from plants) and various limestones with shell fragments. • ex. Coquina (fossil shells cemented together;) and Chalk (made of microscopic planktonic organisms; fizzes readily in acid) ...
CODES SEG Student Chapter Student-Industry Field Trip South Ural
... deposits (also gold rich VHMS deposits discussed earlier). The gold-quartz deposits are found in or near fault zones in sedimentary or volcano-sedimentary sequences. They are related to dikes and small intrusions but are generally some distance from major granitic plutons. The ore is hosted in vein ...
... deposits (also gold rich VHMS deposits discussed earlier). The gold-quartz deposits are found in or near fault zones in sedimentary or volcano-sedimentary sequences. They are related to dikes and small intrusions but are generally some distance from major granitic plutons. The ore is hosted in vein ...
K-feldspar, feldspathoids
... • Very incompatible elements (large ions, typically) concentrated in last liquids, then in fluids • The same elements are leached from an already cooled rock (igneous intrusion or its wall-rock) • Precipitate with hydrothermal veins ...
... • Very incompatible elements (large ions, typically) concentrated in last liquids, then in fluids • The same elements are leached from an already cooled rock (igneous intrusion or its wall-rock) • Precipitate with hydrothermal veins ...
A Discussion of Some Definitions in Economic Geology Philip A
... Penultimately, there are the qualitative factors in the anomaly: if the background is 35 ppm Cu, and the sd is 10 ppm, and some assays come in at 100 ppm, are they worth a look? Sure. But, by using my example from above, what if they’re just samples from a copper-rich basaltic andesite? The basaltic ...
... Penultimately, there are the qualitative factors in the anomaly: if the background is 35 ppm Cu, and the sd is 10 ppm, and some assays come in at 100 ppm, are they worth a look? Sure. But, by using my example from above, what if they’re just samples from a copper-rich basaltic andesite? The basaltic ...
Formation of spreading zones on the ocean floor (by the example of
... Sakhalin hydrocarbon deposits, in conditions of oceanic crust extension (transform fault zone), in the thermal convection regime, and with serpentinite layer as a contributing factor. Attention of many foreign companies and investors is focused on exploitation and development of oil deposits on the ...
... Sakhalin hydrocarbon deposits, in conditions of oceanic crust extension (transform fault zone), in the thermal convection regime, and with serpentinite layer as a contributing factor. Attention of many foreign companies and investors is focused on exploitation and development of oil deposits on the ...
Classification of rare earth deposit and occurrence types
... of the classification of REE deposits, traditionally there has always been the separation into three broad classes (A to C, below); taking into account the host rocks and mineralogy, namely: ...
... of the classification of REE deposits, traditionally there has always been the separation into three broad classes (A to C, below); taking into account the host rocks and mineralogy, namely: ...
Origin of gypsum formations in copper deposit of Murgul, NE Turkey
... the erosion events. Gypsum lens is located on the upper level of the formerly existing Bognari orebody refers to a brecciated bearing mineralization formed under atmospheric conditions. Here gypsum formations can indicate the environment by oxidation of sulphide minerals associated with atmospheric ...
... the erosion events. Gypsum lens is located on the upper level of the formerly existing Bognari orebody refers to a brecciated bearing mineralization formed under atmospheric conditions. Here gypsum formations can indicate the environment by oxidation of sulphide minerals associated with atmospheric ...
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... The first of the porphyry copper lodes is the type from which the group takes its name, the copper porphyry. San Manuel, Arizona is the location of the first copper porphyry, a stockwork of veinlets in hydrothermally altered intrusives with closely spaced phenocrysts in a microaplitic quartz-feldspa ...
... The first of the porphyry copper lodes is the type from which the group takes its name, the copper porphyry. San Manuel, Arizona is the location of the first copper porphyry, a stockwork of veinlets in hydrothermally altered intrusives with closely spaced phenocrysts in a microaplitic quartz-feldspa ...
Ore genesis
The various theories of ore genesis explain how the various types of mineral deposits form within the Earth's crust. Ore genesis theories are dependent on the mineral or commodity.Ore genesis theories generally involve three components: source, transport or conduit, and trap. This also applies to the petroleum industry, which was first to use this methodology. Source is required because metal must come from somewhere, and be liberated by some process Transport is required first to move the metal-bearing fluids or solid minerals into the right position, and refers to the act of physically moving the metal, as well as chemical or physical phenomenon which encourage movement Trapping is required to concentrate the metal via some physical, chemical or geological mechanism into a concentration which forms mineable oreThe biggest deposits are formed when the source is large, the transport mechanism is efficient, and the trap is active and ready at the right time.