Abstract
The carbonate-rich Espanola Formation forms part of the Huronian Supergroup, deposited in Early Proterozoic time between about 2.5 and 2.1 Ga ago. The Espanola Formation overlies glacigenic diamictites of the Bruce Formation and is gradationally overlain by fluvial sandstones of the Serpent Formation. In the southern part of the outcrop belt, the Espanola Formation comprises a lower limestone member, a middle siltstone member, and an upper heterolithic member. These rocks record what may be the first marine incursion in the early Huronian and perhaps indicate a pre-rift phase of sedimentation. The limestone and siltstone members reflect low-energy conditions with sporadic influxes of fine-grained siliciclastics and carbonate debris from turbidity or storm-derived currents. Deposition took place subtidally, either in a shallow-marine setting or in a large lake, following the end of Bruce glaciation. Deposition of the coarser grained heterolithic member took place in higher energy environments, dominated by shallow-marine tide and storm processes.In the study area, most carbonate is detrital in origin. Paleocurrents suggest a northerly source. The restricted nature of the basin, postglacial warming, and shallower marine conditions could have been factors in carbonate precipitation.
Publisher
Canadian Science Publishing
Subject
General Earth and Planetary Sciences
Cited by
17 articles.
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1. Trapped in a graben: deposition of Huronian gold-bearing conglomerates in a fault-influenced, valley-confined, fluvial system in the southern Cobalt Basin, Ontario, Canada;Canadian Journal of Earth Sciences;2022-07-22
2. Synsedimentary deformation structures within the Paleoproterozoic Espanola Formation, Huronian Supergroup, Canada: Implications for basin tectonism and paleodepositional conditions;Precambrian Research;2021-12
3. Earth’s first snowball event: Evidence from the early Paleoproterozoic Huronian Supergroup;Precambrian Research;2021-10
4. Geochemistry of the Paleoproterozoic Espanola Formation, Bruce Mines—Elliot Lake area, Ontario, Canada: implications for provenance, paleo-weathering, and tectonic setting;Geosciences Journal;2020-06-04
5. In situtrace metal analysis of Neoarchaean - Ordovician shallow-marine microbial-carbonate-hosted pyrites;Geobiology;2015-04-27