Upper Mississippian Antler Foreland Basin Carbonate and Siliciclastic Rocks, East-Central Idaho and Southwestern Montana, U.S.A.: Distinguishing Tectonic and Eustatic Controls on Deposition

Batt, Liselle S.; Pope, Michael C.; Isaacson, Peter E.; Montañez, Isabel P.; Abplanalp, Jason

doi:10.2110/pec.08.89.0147

Cited by 3 publications

(2 citation statements)

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“…Lower Mississippian rocks were deposited on a continental margin most commonly interpreted as an eastward-tapering marine foreland or backarc basin that developed in response to convergent plate motion to the west. Early Mississippian deposition was influenced by local margin-parallel extensional faults perhaps related to foreland basin flexural processes or back arc extension, and by reactivation of pre-existing structures oblique to the margin (Reid and Dorobek, 1993;Batt et al, 2008;Cooley et al, 2011). A significant Carboniferous to Jurassic unconformity in the Sawtooth Range records widespread non-deposition and/or erosion in NW Montana and SW Alberta, during complex, ongoing convergent plate interactions to the west.…”

Section: Structural Burial and Regional Stress Historymentioning

confidence: 99%

Fracture distribution on the Swift Reservoir Anticline, Montana: Implications for structural and lithological controls on fracture intensity

Watkins

Bond

Cawood

et al. 2019

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Where primary porosity and permeability of a rock are unfavourable for hydrocarbon production, fractures can improve reservoir potential by enhancing permeability. Higher fracture intensity may create a better-connected fracture network, improving fractured-reservoir quality. Investigations into the controls on fracture intensity commonly conclude that either structural or lithological factors have the greatest influence on fracture abundance. We use the Swift Reservoir Anticline in northwestern Montana to investigate how fracture intensity varies throughout the structure and determine that although structural factors do influence fracture intensity, lithology is the main control at outcrop.The Swift Reservoir Anticline exposes bedding surfaces of the Mississippian Castle Reef Formation dolomite. Field data indicates that fracture intensity is highest in the fold forelimb, decreasing into the backlimb except in outcrops of coarse dolomite where fracture intensity is low, regardless of structural position. Field fracture intensity correlates with whole-rock quartz, kaolinite and porosity percentages. We suggest porosity and composition influence bulk-rock mechanical properties, which, in turn, control the fracture intensity at outcrop. Fracture intensity has a stronger relationship with lithological than structural factors, therefore we suggest that the key to predicting fracture intensity in the subsurface here is understanding how lithology varies spatially.

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Section: Structural Burial and Regional Stress Historymentioning

confidence: 99%

Fracture distribution on the Swift Reservoir Anticline, Montana: Implications for structural and lithological controls on fracture intensity

Watkins

Bond

Cawood

et al. 2019

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“…There is to this day an active debate as to when large-scale ice-sheets started to form during the Mississippian, indicated by the onset of a clear orbitally-driven cyclicity in the low-paleolatitudes (Smith and Read, 2000;Wright and Vanstone, 2001;Al-Tawil and Read, 2003;Butts, 2005;Batt et al, 2008;Buggisch et al, 2008;Rygel et al, 2008;Bishop et al, 2009;Barham et al, 2012;Fielding and Frank, 2015). Specifically, many records seem to indicate a substantial cooling phase during the middle to late Visean (Asbian; Wright and Vanstone, 2001;Bishop et al, 2009;Barham et al, 2012;Fielding and Frank, 2015), while others suggest a Serpukhovian age for the major climatic deterioration (Butts, 2005;Batt et al, 2008;Buggisch et al, 2008). Currently thought to be tectonically-induced (Sonnenfeld, 1996), the exposure of the Wyoming Shelf during the Middle Visean seems to predate by a few million years the current estimates for the onset of Gondwanan glaciation.…”

Section: Early Tournaisian To Middle Viseanmentioning

confidence: 99%

Impact of continental motion and dynamic glaciations on low-latitude climate during the Carboniferous: The record of the Wyoming Shelf (Western United States)

Blanchard

Fielding

Frank

2015

Palaeogeography, Palaeoclimatology, Palaeoecology

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The dynamic character of the Late Paleozoic Ice Age is evident from glacial deposits, but its impact on tropical climate is not well constrained. Global changes in climate are overprinted on longer-term paleogeographic variations, resulting in a complex time-space distribution of climate-sensitive lithologies. The significance of such lithologies in Carboniferous successions of the western United States has not been fully explored. In this study, we provide new interpretations for the paleoclimatic context of the Amsden and Tensleep Formations (Pennsylvanian, Northern Wyoming, USA). The Amsden Formation consists of a basal sandstone member overlain by red siltstones containing pisolites. Very large-scale (~10 m) cross-bedding within the basal sandstone indicates deposition in an erg environment. Iron pisoid-rich layers in the overlying member suggest an evolution toward more humid conditions. Persistent arid conditions during the middle Pennsylvanian are suggested by eolian sandstones and calcretes in the overlying Tensleep Formation. These formations were deposited on the karst topography that developed on top of the lower to middle Mississippian Madison Group. Although the development of karstic features implies that humid conditions prevailed during the late Mississippian, evaporites and evidence for early dolomitization within the formation suggest that it was deposited under arid conditions. These relationships argue for a long-term climate evolution from arid to humid during the Mississippian, and a return to arid conditions during the Pennsylvanian. This trend can be explained by the northward drift from 15°S to~12°N. A comparison with contemporaneous records reveals a diachronous evolution across western Pangaea, with the climatic conditions documented on the Wyoming Shelf being reached later in eastern North America. These relationships indicate that plate motion considerably overprints long-term climatic records. Departures from this trend, suggested by the presence of erg deposits in the basal Amsden Formation, record the overprinting of shorter periods of climate change.

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Current synthesis of the penultimate icehouse and its imprint on the Upper Devonian through Permian stratigraphic record

Montañez

2021

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Icehouses are the less common climate state on Earth, and thus it is notable that the longest lived (∼370 to 260 Ma) and possibly most extensive and intense of icehouse periods spanned the Carboniferous Period. Mid- to high-latitude glaciogenic deposits reveal a dynamic glaciation-deglaciation history with ice waxing and waning from multiple ice centers and possible transcontinental ice sheets during the apex of glaciation. New high-precision U-Pb ages confirm a hypothesized west-to-east progression of glaciation through the icehouse, but reveal that its demise occurred as a series of synchronous and widespread deglaciations. The dynamic glaciation history, along with repeated perturbations to Earth System components, are archived in the low-latitude stratigraphic record revealing similarities to the Cenozoic icehouse. Further assessing the phasing between climate, oceanographic, and biotic changes during the icehouse requires additional chronostratigraphic constraints. Astrochronology permits the deciphering of time, at high resolution, in the late Paleozoic record as has been demonstrated in deep- and quit-water deposits. Rigorous testing for astronomical forcing in low-latitude cyclothemic successions, which have a direct link to higher latitude glaciogenic records through inferred glacioeustasy, however, will require a comprehensive approach that integrates new techniques with further optimization and additional independent age constraints given challenges associated with shallow-marine to terrestrial records.

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Upper Mississippian Antler Foreland Basin Carbonate and Siliciclastic Rocks, East-Central Idaho and Southwestern Montana, U.S.A.: Distinguishing Tectonic and Eustatic Controls on Deposition

Cited by 3 publications

References 0 publications

Fracture distribution on the Swift Reservoir Anticline, Montana: Implications for structural and lithological controls on fracture intensity

Fracture distribution on the Swift Reservoir Anticline, Montana: Implications for structural and lithological controls on fracture intensity

Impact of continental motion and dynamic glaciations on low-latitude climate during the Carboniferous: The record of the Wyoming Shelf (Western United States)

Current synthesis of the penultimate icehouse and its imprint on the Upper Devonian through Permian stratigraphic record

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