THE LAKE SUPERIOR IRON RANGES: GEOLOGY AND MINING …

An iron range is an elongate belt of layered sedimentary rocks in which one or more layers consist of banded iron-formation, a rock composed of alternating iron-rich and iron-poor layers on a scale of a few centimeters. Banded iron-formation from

Banded Iron Formation Field Trip - University of Wisconsin ...

of Lake Superior type Protero-zoic banded iron formations, and possibly the transition to a sulfidic ocean. At a highway outcrop, the group collected our own samples of the impactite including a very large piece that will be featured in the Geol-ogy Museum's new astrobiology display. On our third day in Canada, we continued

Algoma-type banded-iron formation deposit | Britannica.com

In mineral deposit: Iron deposits …of BIF, known as an Algoma type, formed over a much wider time range than the Lake Superior type (from 3.8 billion to a few hundred million years ago).

Banded Iron Formations | Encyclopedia.com

Most Lake Superior-type banded iron formations formed during the Paleoproterozoic, between 2.5 and 1.8 billion years ago. Prior to this, Earth 's primitive atmosphere and oceans had little or no free oxygen to react with iron, resulting in high iron concentrations in seawater.

QUADRILÁTERO FERRÍFERO FIELD TRIP 24-25 October 2013

orogenic sedimentary assemblages, including a Lake Superior type banded iron formations (4) the Itacolomi Group, composed of sandstones and conglomerates. The QF mining district is the most important gold and iron producer in Brazil. (Alkimin and Noce, 2006). Historical production and present gold reserves exceed 1.000 t.

Banded Iron Formation "BIF" | Geology Page

Lake Superior-type banded iron formations were chemically precipitated on marine continental shelves and in shallow basins. They are commonly interlayered with other sedimentary or volcanic rocks such as shale and tuff. Most Lake Superior-type banded iron formations formed during the Paleoproterozoic, between 2.5 and 1.8 billion years ago.

Lake Superior-type banded-iron formation deposit ...

In mineral deposit: Iron deposits …Lake Superior and are called Lake Superior-type deposits. Their individual sediment layers can be as thin as 0.5 millimetre (0.02 inch) or as thick as 2.5 centimetres (1 inch), but the alternation of a siliceous band and an iron mineral band is invariable.

Banded iron formation and Mylonite Types and Facts

Types of Banded iron formation are Algoma-type, Lake Superior-type, Superior-type and Taconite whereas the types of Mylonite are Blastomylonites, Ultramylonites and Phyllonites.During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs.

SPECTRAL AND GEOCHEMICAL CHARACTERISTICS OF LAKE …

SPECTRAL AND GEOCHEMICAL CHARACTERISTICS OF LAKE SUPERIOR TYPE BANDED IRON FORMATION: ANALOG TO THE MARTIAN HEMATITE OUTCROPS. Alicia Fallacaro1 and Wendy M. Calvin1, 1University of Nevada, Reno. Introduction: The Thermal Emission Spectrome- ter (TES) onboard Mars Global Surveyor discovered

Felsite and Banded iron formation Types and Facts

Know more about Felsite Texture and Banded iron formation Texture. Types of Felsite are Not Available whereas the types of Banded iron formation are Algoma-type, Lake Superior-type, Superior-type and Taconite.During historic times, some rocks depending on their hardness were used to create Pictographs and Petroglyphs.

Formations of Banded Iron in World | Metals | Metallurgy

Summary of depositional types iron-formations. Relative to the principal environments of deposition, a grouping into two main types of banded iron-formation has been explicitly established by Gross (1965): the Algorna-type and the Lake Superior type. A comparison of the characteristic features of these two types is shown in Table 2.2.

Banded Iron Formation - an overview | ScienceDirect Topics

Banded iron formation or BIF is a chemical sediment, ... Age distributions of Rapitan/Clinton iron-formations, Algoma and Superior type banded iron-formations, volcanogenic massive sulphide deposits, vein-type Au–U deposits, and quartz-pebble conglomerate-type Au–U deposits. ... Lake Superior type BIF, especially that of Ediacaran age.

TABLE DR1. PRECAMBRIAN SUPERIOR-TYPE BANDED IRON ...

Algoma-type iron formation, which occurs in or is closely associated with volumetrically abundant metavolcanic rocks (1, 2, 3), is excluded from the compilation because this generally smaller type of iron deposit, relative to Superior-type BIF, does not inform the redox state of …

Major Mines & Projects | Alegria Mine

The Lake Superior-type Cauê banded-iron Formation lies on Caraça metasediments. The Cauê Formation is a carbonate sequence of the Gandarela Formation. Lying locally unconformably on the Gandarela Formation, the Piracicaba Group comprises a thick pile of shallow-water and deltaic strata.

CHEMOSTRATIGRAPHY OF NEOPROTEROZOIC BANDED IRON FORMATION ...

(A) Deposi- tion of Rapitan type banded iron formation (BIF) during glacial retreat, exemplified by the type occurrence in the Rapitan Group (Modified from Baldwin et …

Ironwood: The Rocks of the Penokee Range ...

Geologists working in the Lake Superior region have recently discovered that iron formation deposition ... a process central to mining formations like the kind found in the Penokee Range. In some areas of the Ironwood Formation there are abundant layers of quartz, constituting a rock that is commonly referred to as banded iron formation, ...

Chapter 9 Flashcards | Quizlet

Chapter 9. STUDY. PLAY. ... The Proterozoic cyclic succession of the banded iron formations is a. quartz sandstones, arkoses, conglomerates, basalts. ... Deposits of what metal are found in Keweenawan basaltic rocks and conglomerates in the Lake Superior region? a. gold b. iron …

Banded iron formation - sandatlas.org

Algoma-type deposits are mined in the Abitibi greenstone belt (Ontario, Canada), Bjørnevatn (Norway), Kostomuksha (Russian Karelia), etc. By far the most important type of banded iron formations formed during the Paleoproterozoic (Superior-type, named after lake Superior). They formed on stable continental shelves.

Formación de hierro bandeado - Wikipedia, la enciclopedia ...

Las formaciones de hierro bandeado (BIF, Banded Iron Formation) son rocas sedimentarias que contienen al menos un 15% de hierro (Fe), [1] y presentan una estructura formada por bandas, estando unas compuestas por el hierro, y las otras por sílex. [2]

Chemostratigraphy of Neoproterozoic banded iron formation ...

Chemostratigraphy of Neoproterozoic banded iron formation (BIF): types, age and origin ... Lake Superior type BIF are represented by the Tonian Shilu Group (South China) and the late Ediacaran ...

Extraterrestrial demise of banded iron formations 1.85 ...

In the Lake Superior region of North America, deposition of most banded iron formations (BIFs) ended abruptly 1.85 Ga ago, coincident with the oceanic …

Spectral Properties of Lake Superior Banded Iron Formation ...

Lake Superior Type (LST) banded iron formation (BIF) was investigated as a spectral and possible process analog to these deposits. In northern Michigan, LST BIF formed in a sedimentary, continental shelf or shallow basin environment under stable tectonic conditions, and the oxide facies contains gray, crystalline hematite.

Agate Basics - Gitche Gumee Agate and History Museum

Sometimes agates are named because of their formation type, such as a fortification agate. In other cases, they are named after the location in which they are found, such as Brazilian Agate. ... The primary area of Lake Superior agate distribution is shown below. ... Like agate, though, can be banded with conchoidal fractures.

Iron-rich sedimentary rocks - Wikipedia

Iron formations are sometimes divided into Raptian-type, Algoma-type and Superior-type. Algoma type. Algoma types are small lenticular iron deposits that are associated with volcanic rocks and turbidites. Iron content in this class type rarely exceeds 10 …

Lake Superior Type Banded Iron Formation - kasprzyk-art.eu

Lake Superior-type banded iron formations The majority of Lake Superior, or simply Superior, type BIFs are located on stable continental platforms. Online Service. Types of Agate With Photos - Geology In. Agate is not simply "banded . The Lake Superior agate is a type of agate stained by iron and found on the .

SUPERIOR FE DEPOSITS (MODEL 34a; Cannon, 1986)

No wall rock alteration is associated with Superior iron deposits. Formation of Superior-type iron-formation results from processes involving chemical sedimentation. Nature of ore Most ore is banded rock in which iron-rich bands are interlayered with chert …

Types and general characteristics of the BIF-related iron ...

BIFs (banded iron formations) in China, which account for approximately 64% of the total identified resources in the country, belong to two categories: a predominant Neoarchean Algoma-type and a few Paleoproterozoic Superior-type.

Lake Superior-type iron formation: - mngs.umn.edu

Lake Superior-type iron formation: Iron formations which formed during Middle Precambrian time (about 2,000 million years ago) and were first described in the Lake Superior region. The type is characterized by interlayers (bands) of iron minerals and chert (quartz).

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