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Title: Lacustrine-humate model for primary uranium ore deposits, Grants Uranium Region, New Mexico

Abstract

Two generations of uranium ore, primary and redistributed, occur in fluvial sandstones of the Upper Jurassic Morrison Formation in the San Juan basin; the two stages of ore formation can be related to the hydrologic history of the basin. Primary ore formed soon after Morrison deposition, in the Late Jurassic to Early Cretaceous, and a model, the lacustrine-humate model, is offered that views primary mineralization as a diagenetic event related to early pore fluid evolution. The basic premise is that the humate, a pore-filling organic material closely associated with primary ore, originated as humic acids dissolved in pore waters of greenish-gray lacustrine mudstones deposited in the mud-flat facies of the Brushy Basin Member and similar K shale beds in the Westwater Canyon Member. During compaction associated with early burial, formation water expelled from lacustrine mudstone units carried these humic acids into adjacent sandstone beds where the organics precipitated, forming the humate deposits that concentrated uranium. During the Tertiary, much later in the hydrologic history of the basin, when Jurassic sediments were largely compacted, oxygenated ground water flowed basinward from uplifted basin margins. This invasion of Morrison sandstone beds by oxidizing ground waters redistributed uranium from primary ores along redox boundaries,more » forming ore deposits that resemble roll-front-type uranium ores. 11 figures.« less

Authors:
Publication Date:
Research Org.:
Geological Survey, Denver, CO
OSTI Identifier:
5942373
Alternate Identifier(s):
OSTI ID: 5942373
Resource Type:
Journal Article
Journal Name:
Am. Assoc. Pet. Geol., Bull.; (United States)
Additional Journal Information:
Journal Volume: 69:11
Country of Publication:
United States
Language:
English
Subject:
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS; NEW MEXICO; URANIUM DEPOSITS; ORIGIN; CRETACEOUS PERIOD; DEPOSITION; GEOLOGIC FORMATIONS; GEOLOGIC HISTORY; GEOLOGIC MODELS; JURASSIC PERIOD; SEDIMENTARY BASINS; FEDERAL REGION VI; GEOLOGIC AGES; GEOLOGIC DEPOSITS; GEOLOGIC STRUCTURES; MESOZOIC ERA; MINERAL RESOURCES; NORTH AMERICA; RESOURCES; USA 050200* -- Nuclear Fuels-- Exploration-- (-1987)

Citation Formats

Turner-Peterson, C.E. Lacustrine-humate model for primary uranium ore deposits, Grants Uranium Region, New Mexico. United States: N. p., 1985. Web.
Turner-Peterson, C.E. Lacustrine-humate model for primary uranium ore deposits, Grants Uranium Region, New Mexico. United States.
Turner-Peterson, C.E. Fri . "Lacustrine-humate model for primary uranium ore deposits, Grants Uranium Region, New Mexico". United States.
@article{osti_5942373,
title = {Lacustrine-humate model for primary uranium ore deposits, Grants Uranium Region, New Mexico},
author = {Turner-Peterson, C.E.},
abstractNote = {Two generations of uranium ore, primary and redistributed, occur in fluvial sandstones of the Upper Jurassic Morrison Formation in the San Juan basin; the two stages of ore formation can be related to the hydrologic history of the basin. Primary ore formed soon after Morrison deposition, in the Late Jurassic to Early Cretaceous, and a model, the lacustrine-humate model, is offered that views primary mineralization as a diagenetic event related to early pore fluid evolution. The basic premise is that the humate, a pore-filling organic material closely associated with primary ore, originated as humic acids dissolved in pore waters of greenish-gray lacustrine mudstones deposited in the mud-flat facies of the Brushy Basin Member and similar K shale beds in the Westwater Canyon Member. During compaction associated with early burial, formation water expelled from lacustrine mudstone units carried these humic acids into adjacent sandstone beds where the organics precipitated, forming the humate deposits that concentrated uranium. During the Tertiary, much later in the hydrologic history of the basin, when Jurassic sediments were largely compacted, oxygenated ground water flowed basinward from uplifted basin margins. This invasion of Morrison sandstone beds by oxidizing ground waters redistributed uranium from primary ores along redox boundaries, forming ore deposits that resemble roll-front-type uranium ores. 11 figures.},
doi = {},
journal = {Am. Assoc. Pet. Geol., Bull.; (United States)},
number = ,
volume = 69:11,
place = {United States},
year = {1985},
month = {11}
}