"Future studies will aim to quantify the full extent of these Cambrian banded iron formations
in China and whether similar deposits can be found elsewhere," says Kurt Konhauser.
Gutzmer, "Deciphering formation processes of banded iron formations
from the Transvaal and the Hamersley successions by combined Si and Fe isotope analysis using UV femtosecond laser ablation," Geochimica et Cosmochimica Acta, vol.
Inter-bedded schists, amphibolites and banded iron formations
with thickness ranging between dozens of metres and 250m constitute the target zone of this deposit.
The claims are located over an area over 3 kms long of outcropping Precambrian Banded Iron Formations
with Iron and potentially precious metal mineralization.
Konhauser's team had previously amassed samples of sedimentary rocks called banded iron formations
that span the last three billion years of Earth's history.
VTEM and magnetometer survey covering 1,700 line kilometres delineated numerous targets favourable for gold deposits associated with banded iron formations
as well as targets that exhibit high potential for massive sulphide copper, zinc, gold and silver deposits.
The drilling was carried out over an aggregate 1km strike length of targets within a 4km strike length of multiple banded iron formations
(BIF) in the northern part of the project area, representing only a very small part of the total 40km BIF strike length within the project tenements.
Banded iron formations
and calcium carbonate reef deposits as old as 3.5 billion years give signs of the first organically produced oxygen--but this long ago the atmosphere still was largely anoxic.
But the new analyses of ancient rocks known as banded iron formations
(SN: 6/20/09, p.
Called banded iron formations
or BIFs, these ancient rocks formed between 3.8 and 1.7 billion years ago at what was then the bottom of the ocean.
Sixth, the reappearance of banded iron formations
in the late Neoproterozoic has been genetically linked to global glaciation; the assumption is that anoxic seawaters form below a global cover of thick sea ice thereby enabling ferrous iron to remain in solution (Hoffman et al., 1998; Hoffman and Schrag, 2002).
The orebody is a flat to gently dipping sheet of hydrothermally altered schist that is closely related to banded iron formations
. Oxide mineralization occurs within 45 meters of the surface.