Banded-iron formation | rock | Britannica
29-7-2020 · Banded-iron formation (BIF), chemically precipitated sediment, typically thin bedded or laminated, consisting of 15 percent or more iron of sedimentary origin and layers of chert, chalcedony, jasper, or quartz.Such formations occur on all the continents and usually are older than 1.7 billion years. They also are highly metamorphosed.
Origin of iron ore by diagenetic replacement of …
26-7-1974 · Origin of iron ore by diagenetic ... or quantitatively improbable 2 hypotheses have been offered to explain the origins of extensive sedimentary rocks rich in iron. Ironstones and iron formations ...
What Is the Origin of Iron? | Sciencing
Irons origin begins in space with the explosion or a star. The metal, which of one of Earths most abundant elements, has been used to build railroads, buildings, and other important structures.
Origin and Paleoenvironmental Significance of …
The spark to put together this volume on banded iron formation (BIF)-related high-grade iron ore was born in 2005 during a steamy night in Carajás where the iron research group from the Universidade Federal Minas Gerais, Vale geologists, Carlos Rosière and Steffen Hagemann, were hotly debating the hypogene alteration genesis for the high-grade, jaspilite-hosted Serra Norte iron ore deposits.
Iron Deposits – Banded Iron Formations (BIF) | …
17-10-2019 · Iron Ore Train Leaving Brookman Mine, Pilbara Image: CC. In 2009 Australia produced 394 million tonnes of iron ore valued at $30 billion- 97% of which came from the Pilbara mines. Australia is the world’s largest exporter, and second largest producer, after China of iron ore.
Geology, Prospecting and Exploration for Iron Ore …
Iron ore deposits are distributed in different regions of the world under varied geological conditions and in different geological formations. The largest ore concentration is found in banded sedimentary iron formations of Precambrian age. These formations constitute the bulk of iron ore resources of the world. Iron ores occur in a wide variety ...
Iron and Manganese Ore Deposits: Mineralogy, Geochemistry ...
deposits of both iron and manganese are of sedimentary origin. At present, high-grade iron ore deposits formed by hydrothermal and supergene enrichment of Proterozoic banded iron formations constitute the most important source for iron ores, with only some magmatic and skarn-type iron ore deposits being mined. Economically important manganese ore
Iron Formation: The Sedimentary Product of a Complex ...
rived from iron formations rank among the largest ore deposits and are the principal source of iron for the global steel indus-try. Given their economic importance, iron formations have been extensively studied during the past one hundred years, but many aspects of their sedimentary origin remain enig-matic because modern analogues are unknown.
Chapter 2 Origin and Timing of Banded Iron Formation ...
HIGH-GRADE (60 wt % Fe) hematite iron ore deposits that are hosted by banded iron formation (BIF) are known for all the continents, excluding Antarctica. These deposits are the products of the enrichment of Precambrian BIFs, and they are one of the most important sources of iron ore …
The Iron Formations of Southern Africa | SpringerLink
Beukes NJ, Gutzmer J (2008) Origin and paleoenvironmental significance of major iron formations at the Archean-Paleoproterozoic boundary. Rev Econ Geol 15:5–47 Google Scholar Beukes NJ, Gutzmer J, Mukhopadhyay J (2003) The geology and genesis of high-grade iron ore deposits.
Where Does Iron Come From or How Is It Made? | …
Iron (abbreviated Fe) on Earth is made from iron ore, which contains the element iron along with varying amounts of rock. Iron is the primary element in the manufacture of steel. The element iron itself comes from supernovae, which represent the violent explosive deaths of faraway stars.
Iron ore: how our greatest asset is formed
An ore is an economically exploitable mineral or an association of minerals (rock). Iron ore, for example, which is our main product, occurs in its oxide, carbonate, sulphate and silicate forms. The largest sources of iron ore on the planet are known as banded iron formations (BIFs), known …
Sedimentary rock - Iron-rich sedimentary rocks | …
28-7-2020 · Sedimentary rock - Sedimentary rock - Iron-rich sedimentary rocks: Almost all sedimentary rocks are iron-bearing in the sense that mudrocks, sandstones, and carbonates typically have an iron content of several percent. Nevertheless, sedimentary rocks in which the proportion of iron exceeds 15 percent are separately categorized as iron-rich.
Banded Iron Formation - an overview | …
Kent C. Condie, in Earth as an Evolving Planetary System (Third Edition), 2016. Banded Iron Formation. Banded iron formation or BIF is a stone sediment, typically thin-bedded or laminated with > 15% iron of sedimentary origin (Figure 8.6).BIF has a very distinct distribution with time (Figure 8.25).It is found in minor amounts in the early Archean and in large amounts in the late Archean ...
New research supports volcanic origin of Kiruna …
12-4-2019 · The origin of giant apatite-iron oxide ores of the so-called Kiruna-type has been the topic of a long standing debate that has lasted for over 100 years. In a new article, scientists present new ...