geology and origin of magnetite deposits

Geology, alteration, age, and origin of iron oxide-apatite ...

Iron oxide-apatite deposits are present in Upper Eocene pyroxene-quartz monzonitic rocks of the Zanjan district, northwestern Iran. Mineralization occurred in five stages: (1) deposition of disseminated magnetite and apatite in the host rock; (2) mineralization of massive and banded magnetite ores in veins and stockwork associated with minor brecciation and calcic alteration of host rocks; (3 ...

[PDF] Sedimentary exhalative origin for magnetite deposits ...

The New Jersey Highlands and contiguous Hudson (New York) Highlands host hundreds of small, worked-out magnetite mines, and the major zinc-oxide deposits of Franklin and Sterling Hill. The origin of the magnetite ore remains controversial. Two temporally distinct genetic models have been proposed for magnetite: (1) a pre-Ottawan, sedimentary exhalative model in which ores were deposited on the ...

Geology and Ore Deposits of the Central Andes

Geology and Ore Deposits of the Central Andes ... sent their work on the isotopic constraints of the age and origin of gold-quartz veins in the Parcoy district of Peru. In many respects, the most unusual and least well understood deposits of the region are the magnetite deposits of El Laco, in northern Chile. Long considered a type-example of ...

Magnetite | Geology Wiki | Fandom

Magnetite is a rock mineral and one of the main iron ores, with the chemical formula Fe3O4. It is one of the oxides of iron, and is ferrimagnetic; it is attracted to a magnet and can be magnetized to become a permanent magnet itself.56 It is the most magnetic of all the naturally-occurring minerals on Earth.57 Naturally-magnetized pieces of magnetite, called lodestone, will attract small ...

Magnetite: South Australia's potential

The largest magnetite BIF resource is the giant >4.5 Bt Warramboo deposit, a late Paleoproterozoic magnetite metasediment with a head grade of ~17% Fe and characterised by coarse magnetite grain size (106 µm), a consequence of upper granulite facies metamorphism and intense deformation related to the Kimban Orogeny.

Magnetite Deposits at Tuxedni Bay Alaska

The western deposit of this report is the same one refed to in previous reports on magnetite at Tuxedni Bay (Martin, 1920, p. 35; Brooks, 1921, p. 42; Moffit, 1927, p. 55-56 and pl. 4). Although. the location of the magnetite deposit as shown by Moffit (1927, pl. 4) is not identical with the Iocation given in this report, the two descrip-

(PDF) Geology and geochemistry of paleoproterozoic ...

Simplified geology of the Paleoproterozoic in Liaoning, Jilin, China (modified after Zhang, 1984). Overlying are the graphite-rich gneisses, marbles rich. Rutile and magnetite are enriched in places, and and amphibolites, termed as the Gaojiayu Formation. banded iron deposits are found in this unit.

Geology, published online on 19 May 2015 as doi:10.1130 ...

wetting of magnetite, followed by buoyant segregation of these early-formed magmatic magnetite-bubble pairs, which become a rising magnetite suspension that deposits massive magnetite in regional-scale transcurrent faults. Our data demonstrate an unambiguous magmatic origin, consistent with the namesake IOA analogue in the Kiruna district, Sweden.

Sedimentary Exhalative Origin for Magnetite Deposits of ...

Draft 1 1 Sedimentary Exhalative Origin for Magnetite Deposits of the New Jersey 2 Highlands 3 Peter Matt, Wayne Powell, Richard Volkert, Matthew Gorring and Al Johnson 4 5 ABSTRACT 6 The New Jersey Highlands and contiguous Hudson (New York) Highlands host hundreds of 7 small, worked-out magnetite mines, and the major zinc-oxide deposits of Franklin and Sterling

Magnetite Geochemistry of the Jinchuan Ni-Cu-PGE Deposit ...

Such hydrothermal-like origin in geochemistry for Type II and III magnetite at Jinchuan may be comparable to magnetite crystallized from magmatic-hydrothermal fluids or systems of hydrothermal deposits, such as porphyry (e.g., Yuleken deposit), skarn (e.g., Tengtie, Tieshan, Baijian, and Fushan deposits) [15,20,51], and IOCG deposits (e.g ...

Learning Geology: Iron Ore

Mar 17, 2015· Chilean magnetite iron ore deposits within the Atacama Desert have also formed alluvial accumulations of magnetite in streams leading from these volcanic formations. Some magnetite skarn and hydrothermal deposits have been worked in the past as high-grade iron ore deposits requiring little beneficiation.

THE RELATION OF THE TITANIFEROUS MAGNETITE …

the deposits. everal types have been found. A survey bul­ letin describing the results of this study is now in preparation. Thi paper is concerned chiefly with an investigation of the origin of the various types of magnetite deposits. The work ha been carried out under the supervision of F. F. Grout, whose

NEW FIELD EVIDENCE BEARING ON THE ORIGIN OF THE EL LACO ...

Aug 01, 2002· The El Laco magnetite deposit has been interpreted as lava flows and feeder dikes formed from iron oxide magma, but more recently, as a product of metasomatic replacement. Open-pit exposure created at Laco Sur during the 1990s reveals that the massive magnetite contains magnetite-veined blocks and smaller fragments of altered andesitic volcanic ...

Recording Fidelity of Relative Paleointensity ...

Jun 28, 2021· Magnetic analyses suggest that both small biogenic and relatively large detrital magnetite record geomagnetic information, and the two groups of magnetite deposit at about the same time. Based on the age model, core NP02 RPI record preserves the Rockall and Laschamp excursions, and the RPI pattern is consistent with other RPI stacks and records ...

Geochemistry of the Furnace Magnetite Bed, Franklin, New ...

3. Map showing the Franklin zinc deposit, the Furnace magnetite bed, and nearby marble-hosted and gneiss-hosted magnetite deposits. The zinc deposit is a north-plunging synform; the Furnace bed underlies its west limb and wraps around its keel at depth. …

Mineral deposit - Immiscible melts | Britannica

Mineral deposit - Mineral deposit - Immiscible melts: A different kind of magmatic segregation involves liquid immiscibility. A cooling magma will sometimes precipitate droplets of a second magma that has an entirely different composition. Like oil and water, the two magmas will not mix (i.e., they are immiscible). The chemical principle governing precipitation of an immiscible liquid is the ...

Geology of Rare Earth Deposits

Geology of Rare Earth Deposits Tracy Bank, Elliot Roth, Bret Howard, Evan Granite. ... peralkaline in origin. Map courtesy of David Lentz, University of New ... Magnetite – Apatite Deposits • Pegmatites are course-grained felsic igneous intrusive rocks that are

1 IRON ORE DEPOSITS OF INDIA

Hematite and magnetite are the most important ore minerals in the Indian iron ore deposits. About 59% hematite ore deposits are found in the Eastern Sector and about 92% magnetite ore deposits occur in the Southern Sector, especially in Karnataka. Of these, hematite is considered to be superior because of its higher grade and occurs in massive,

Composite origin of magnetite deposits hosted in Oman ...

The essential origin of our magnetite deposits is hydrothermal one due to the mobility and leaching of iron from serpentinites and the in-situ selective precipitation of iron within the nonconformity surface. This process was feasible because the nonconformity zone was a weathering surface, a channel for both hydrothermal-fluid flow providing ...

[PDF] The Magnetite Crisis in the Evolution of Arc-related ...

The association of large Au–Cu–Ag ore deposits with convergent margins is commonly attributed to the higher content of chalcophile elements in the parental magmas generated at subduction zones compared with mid-ocean ridges. We present new geochemical data for arc-like, relatively oxidized mantle-derived basalt to rhyolite magmas from the Pual Ridge and vicinity, Eastern Manus Basin, which ...

Stable Isotope and Petrologic Evidence for the Origin of ...

Stable Isotope and Petrologic Evidence for the Origin of Regional Marble-Hosted Magnetite Deposits and the Zinc Deposits at Franklin and Sterling Hill, New Jersey Highlands, United States WILLIAM H. PECK,1,† RICHARD A. VOLKERT,2 ADAM T. MANSUR,1,* AND BRET A. DOVERSPIKE1 1Department of Geology, Colgate University, Hamilton, New York 13346

Iron and Manganese Ore Deposits: Mineralogy, …

Iron ore deposits are known to occur in sedimentary, hydrothermal, and magmatic environments, but production today is almost entirely from three types of deposit: deposits related to Precambrian banded iron formations provide about 90% of all iron ore mined, and the remainder is derived from metasomatic skarn and magmatic magnetite deposits.

Magnetite | Geology Page

May 28, 2014· Name Origin: Named for Magnes, a Geek shepherd, who discovered the mineral on Mt, Ida, He noted that the nails of his shoe and the iron ferrule of his staff clung to a rock. Magnetite is a mineral, one of the three common naturally occurring iron oxides (chemical formula Fe 3 O 4) and a member of the spinel group. Magnetite …

SOME MAGNETITE DEPOSITS

Big Iron Magnetite Deposit 7 1936. Culver, Harold E., The geology of Washington: Washington Div. Geology Bull. 32, pt. 1, General features of Washington

Geochemical constraints on the origin of the Sterling Hill ...

The purpose of this chapter is to review two aspects of the geochemistry of the Sterling Hill and Franklin zinc-ironmanganese deposits and the Furnace magnetite bed that underlies the Franklin deposit. These are (1) oxidation and sulfidation states determined from heterogeneous phase equilibria, and (2) stable isotopic compositions determined from analyses of carbonate, silicate, oxide, and ...

Finger fluid evolution by trace elements in ...

The prograde skarn minerals have a range of δ 18 O fluid values from 8.81 to 9.53‰, and the sulfide minerals of the main ore stage have a range of δ 34 S values from −2.40 to 2.57‰, both suggesting a magmatic origin of the ores. In the Debao deposit, hydrothermal magnetite from different skarn zones contains substantial amounts of Al ...

SP-02 Geology and Origin of the Iron Ore Deposits of the ...

One of the ore bodies has a mineralogic zoning characterized by a magnetite zone incorporated within and surrounded by a hausmannite zone. Near the bottom of the deposit both the cementing hematite and the early brecciated hematite give way to carbonate minerals. ... SP-02 Geology and Origin of the Iron Ore Deposits of the Zenith Mine Vermilion ...