The Origin of Precambrian Banded Iron Ores
Author: Eugene A. Alexandrov
Publisher:
Published: 1956
Total Pages: 82
ISBN-13:
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Author: Eugene A. Alexandrov
Publisher:
Published: 1956
Total Pages: 82
ISBN-13:
DOWNLOAD EBOOKAuthor: J. J. Chauvel
Publisher:
Published: 1990
Total Pages: 480
ISBN-13:
DOWNLOAD EBOOKAuthor: Y.P. Mel'nik
Publisher: Elsevier
Published: 1982-01-01
Total Pages: 323
ISBN-13: 0080869041
DOWNLOAD EBOOKPrecambrian Banded-Iron-Formations
Author: Desmond Fitzgerald Lascelles
Publisher: Nova Science Publishers
Published: 2017-06
Total Pages: 0
ISBN-13: 9781536109719
DOWNLOAD EBOOKFrom the first attempts to understand the origin of giant iron ore deposits, numerous false assumptions have been used as the basis of genesis models that have become standard and unquestioned, with later research generally seeking to find evidence supporting the existing models and ignoring contrary evidence. Many models were constructed based on extremely rare features, and their absence in the global abundance of iron formations was not considered important since there was no understanding of the major sedimentary structures, i.e. laminations and banding. Inconsistencies within the hypothetical models are either ignored or excused by proposing special circumstances, but no one considers that the models might be wrong or have only limited application. Many hypotheses regarding Earths history have been postulated from the difference between Phanerozoic and Precambrian iron-formations. In particular, the development of an oxygenated atmosphere has been deduced from the supposed evolution of iron-formations. The subject has provided a fertile field for research and models of Earths history, but without clear knowledge of the sedimentation, diagenesis and metamorphism of BIFs (branded iron formations), such models are speculative or even irrelevant. Since these models on the genesis and distribution of BIF were used as proxies to answer questions regarding the composition of the early oceans and atmosphere, weathering and transport conditions on early land surface, volcanism and continental development in the Archean eon, and as they affect exploration for the largest volume and most basic of industrial metals, they have an importance beyond academic sedimentary and stratigraphic interest. The aim of this book is to present a model for the origin of BIFs and derived high-grade iron ore deposits with global applications that are still subject to correction and change as new information becomes available and are free of illogical assumptions which do not conflict with either field observations or basic chemistry and physics.
Author: A.F. Trendall
Publisher: Elsevier
Published: 2000-04-01
Total Pages: 559
ISBN-13: 008086905X
DOWNLOAD EBOOKIron-Formation: Facts and Problems
Author: J. E. Maynard
Publisher:
Published: 1932
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: IU. P. Melnik ((IUrii Petrovich))
Publisher:
Published: 1982
Total Pages: 310
ISBN-13: 9780444419347
DOWNLOAD EBOOKAuthor: J. E. Maynard
Publisher:
Published: 1928
Total Pages:
ISBN-13:
DOWNLOAD EBOOKAuthor: Stephen E. Kesler
Publisher: Geological Society of America
Published: 2006-01-01
Total Pages: 350
ISBN-13: 0813711983
DOWNLOAD EBOOK"The history of Earth's early atmosphere, hydrosphere, and biosphere, from Hadean through Proterozoic time, is one of geology's enduring puzzles. Ore deposits provide important insights into this history because they contain elements and minerals that are highly sensitive to the geochemical environment in which they form. Just what these minerals tell us remains a matter of considerable debate, however. When and how did life develop, an oxygen-rich atmosphere form, and sulfate dominate the ocean? This volume contains reports on these questions from both sides of the aisle for iron and manganese formations, uranium paleoplacers and hydrothermal deposits, and exhalative sulfides and oxides."--Publisher's website.