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GeoRef Categories
Era and Period
Epoch and Age
Book Series
Date
Availability
Formation of a granite-related Sn-Pb-Zn-(Ag) deposit from three discrete mineralization events around a common magmatic-hydrothermal center over a span of ~45 million years at Changpu, eastern Guangdong, South China Available to Purchase
Generation of Cu-Au skarn mineralization by mafic magma recharge: Insights from the Bozymchak deposit in the Chatkal-Kurama region, Kyrgyzstan, West Tianshan Available to Purchase
The role of graphite in the formation of unconformity-related uranium deposits of the Athabasca Basin, Canada: A case study of Raman spectroscopy of graphite from the world-class Phoenix uranium deposit Available to Purchase
Formation of the high-grade Triple R uranium deposit revealed by Fe and S isotopes in pyrite Open Access
Geology and Genesis of the Unkurtash Intrusion-Related Gold Deposit, Tien Shan, Kyrgyzstan Available to Purchase
Fluid sources in basement-hosted unconformity–uranium ore systems: tourmaline chemistry and boron isotopes from the Patterson Lake corridor deposits, Canada Available to Purchase
RECOGNITION OF A 600-KM-LONG LATE TRIASSIC RARE METAL (Li-Rb-Be-Nb-Ta) PEGMATITE BELT IN THE WESTERN KUNLUN OROGENIC BELT, WESTERN CHINA Available to Purchase
Hydrothermal Rare Earth Element (Xenotime) Mineralization at Maw Zone, Athabasca Basin, Canada, and Its Relationship to Unconformity-Related Uranium Deposits—A Reply Available to Purchase
Hydrothermal Rare Earth Element (Xenotime) Mineralization at Maw Zone, Athabasca Basin, Canada, and Its Relationship to Unconformity-Related Uranium Deposits Available to Purchase
Topographic features of the sub-Athabasca Group unconformity surface in the southeastern Athabasca Basin and their relationship to uranium ore deposits Available to Purchase
Regional Stratigraphic, Depositional, and Diagenetic Patterns of the Interior of St. Lawrence Platform: The Lower Ordovician Romaine Formation, Western Anticosti Basin, Quebec Available to Purchase
Abstract Lower Ordovician to lower Middle Ordovician (upper Ibexian to lower Whiterockian; upper Sauk III supersequence) subtidal to peritidal carbonates of the Romaine Formation in the western Anticosti Basin record the evolution during the early Paleozoic of the low-latitude passive margin of eastern North America. A regional paleokarst unconformity, the super-Romaine unconformity corresponding to the North American Sauk-Tippecanoe megase-quence boundary developed on top of the Romaine carbonates during the early Middle Ordovician. The regional distribution of the passive-margin carbonates below the unconformity, however, suggests that significant foreland basin tectonic activity influenced the facies patterns in the uppermost Romaine Formation before the final demise of the Lower Ordovician great American carbonate bank, leading to its eventual subaerial exposure and erosion. The Romaine Formation is mostly composed of peritidal and open-shelf carbonate rocks similar to those in age-equivalent El Paso, Ellenburger, Arbuckle, Knox, Beekmantown, and St. George Groups found along thepresent southern and eastern flanks of the North American craton. Flooding of the Precambrian basement for the first time in the area allowed deposition of a deepening to shallowing carbonate succession in the late Ibexian. A narrow coastal belt of peritidal carbonates onlapped onto the basement with time, but the Romaine platform was mostly covered byopen-marine subtidal carbonate deposits. The latter, assea level receded and offlap began, gave way to peritidal deposition in the latest Ibexian. However, a succession of lower Whiterockian subtidal limestone found locally in the offlapping carbonates indicates that open subtidal conditions resumed briefly before the super-Romaine unconformity formed. This Romaine stratigraphy suggests that two large-scale, third-order, transgressive-regressive sequences are present and can be correlated basinward into the subsurface beneath the northern part of Anticosti Island. Petrographic and geochemical interpretations combined with other geologic and geophysical data provide evidence that the Lower Ordovician carbonates were hydrothermally altered at a regional scale to form porous, structurally controlled dolostone reservoirs. These structurally controlled hydrothermal dolomite reservoirs in the Romaine Formation provide a local but significant trapping mechanism for migrating hydrocarbons along the relatively unde-formed, southwesterly dipping homoclinal succession. Their signature has been recognized along several seismic lines and has served as an exploration guide in the recent round of exploration on Anticosti Island.