Emplacement of a large igneous province as a possible cause of banded iron formation 2.45 billion years ago

Details Emplacement of a large igneous province as a possible cause of banded iron formation 2.45 billion years ago Emplacement of a large igneous province as a possible cause of banded iron formation 2.45 billion years ago

Jan 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997natur.385...55b&link_type=abstract

Nature, Volume 385, Issue 6611, pp. 55-58 (1997).

Mathematics

Logic

22

Scientific paper

LATEST Archaean and earliest Palaeoproterozoic times (from 2.6 to 2.2 billion years ago) have generally been viewed as a largely quiescent period of Earth history; the geological record indicates the very slow deposition of pelagic and chemical sediments1,2, and bears only a limited record of magmatic and tectonic activity3-5. Such quiescence is consistent with the contention that the Earth's main banded iron formations (BIFs)-finely laminated chemical sedimentary rocks, rich in iron oxide-formed slowly as oxygen abundances in the oceans gradually increased, thus reducing the capacity of sea water to retain dissolved iron6-10. Here we show that a large igneous province, comprising >30,000km3 of dolerite, basalt and rhyolite, accompanied deposition of a Hamersley Province BIF 2,449 +/-3 million years ago. This observation indicates that Hamersley BIFs formed during a major tectono-magmatic event and were deposited very much faster than previously thought, at similar rates to (or faster than) modern pelagic sediments. Thus the largest Palaeoproterozoic BIFs, rather than simply reflecting a gradual increase in the oxygen content of the oceans during a period of tectonic quiescence, are more likely to have formed as a result of an increased supply of suboxic iron- and silica-rich sea water upwelling onto continental shelves during a pulse (or pulses) of increased submarine magmatic and hydrothermal activity.

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