Mineral resource potential of the Reservoir-North and the Deep Creek Roadless Areas, Teton County, Montana
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Abstract:
The Deep Creek and Reservoir-North Roadless Areas in northwest Montana contain highly thrust faulted and folded sedimentary rocks that range from Cambrian to Early Cretaceous in age.The areas have a high potential for hydrocarbons and a low potential for metallic mineral resources.The areas contain high purity dolomite and high calcium limestone.The roadless areas contain hydrocarbon source rocks, reservoir rocks, and structural traps.The thermal history of the area suggests that the potential for gas accumulation is greater than the potential for oil.Keywords:
Mineral resource classification
Accretionary wedge
Anticline
Flysch
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AbstrcatJinshajiang river area in Sichuan-Tibet region is the largest copper,lead, zinc, silver polymetallic ore accumulated area in China. Speeding up the exploitation of the rich mineral resources in the area and constructing a new large scale nonferrous metal mining base of China is of strategic importance to set up a mineral resources safely supplying system in our country and is great significant to speed up the economic and social development in western Sichuan and east Tibet region. The mineral resources which have been confirmed by prospecting in the region are abundant and great potential for exploration; The carrying out of Western China Great Exploitation has greatly improved the transportation and communication and energy condition of the region; The technique conditions have been ready for mineral resources exploitation. Therefore it is suggested that the relative authorities and leaders on all the levels should make plan as soon as possible to start construction of large scale nonferrous metal mining base and several suggestions about base construction are also proposed.
Nonferrous metal
Mineral resource classification
Prospecting
Base metal
Lead (geology)
Base (topology)
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Fluvial fans represent one of the dominant sedimentary systems at the active margins of non-marine foreland basins. The Puig-reig anticline at the north-eastern margin of the Ebro Foreland Basin (SE Pyrenees, Spain) exposes continuous outcrops of Late Eocene-Early Oligocene fluvial deposits, from proximal to medial fluvial fan environments. The proximal deposits are found in the north limb of the anticline, especially in the northwest zone. These deposits are characterised by conglomerates with minor interbedded sandstones, with thick and wide sheet-like geometries with unscoured or variably scoured basal surfaces. These are interpreted to be the deposits of unconfined flash floods and wide-shallow channel streams. The medial deposits, covering the rest of the anticline, consist of interbedded conglomerates, sandstones and claystones. These are interpreted to have been deposited from braided to meandering channel streams and overbank areas. Distal deposits are found towards the south, beyond the anticline, and are characterised by sandstone and clay deposits of terminal lobes and lacustrine deltas. This study assesses the impact of the primary depositional characteristics, diagenesis and deformation of the most heterolithic portion of the system, with implications for increasing our understanding of folded fluvial reservoirs. Diagenetic processes, mainly mechanical compaction and calcite cementation, resulted in overall low intergranular porosity, with limited relatively high porosity developed in sandstone lithofacies in the medial deposits. Deformation associated with thrusting and fold growth resulted in the formation of abundant fractures, with relatively high fracture intensities observed in sandstone lithofacies in the anticline crest. This study shows that post-depositional processes can both improve and diminish the reservoir potential of basin proximal fluvial deposits, through the development of fracture networks and by compaction-cementation. The comparison of the Puig-reig anticline with other similar settings worldwide indicates that foreland basin margin locations may be potential areas for effective reservoirs, even in the case of low intergranular porosity.
Anticline
Arenite
Syncline
Outcrop
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Accretionary wedge
Seafloor Spreading
Forearc
Convergent boundary
Thrust fault
Echelon formation
Lineament
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Metamorphic core complex
Lineation
Massif
Detachment fault
Transpression
Mylonite
Extensional tectonics
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Pennsylvanian foreland deformation associated with the Ouachita orogene reactivated a west-northwest-east-southeast Cambrian basement trend, the southern Oklahoma aulacogen, to form the Wichita uplift, southwest Oklahoma. The 30-km-wide subsurface Frontal fault zone separates the uplift from the Anadarko basin to the north. Horizontal shortening across this fault zone is estimated at 7-15 km (20-40%), vertical displacement totals 9-10 km from the uplift to the basin. Folds are mapped on an interformational scale within the Frontal fault zone, and on an intraformational scale (Cambro-Ordovician Arbuckle Group) in the Slick Hills, southwest Oklahoma. Additional shortening occurred along southwest dipping mountain flank thrusts and on bedding plane thrusts, respectively. Hanging wall blocks of major faults contain the shallow dipping limb and anticlinal hinge zone of the interformational scale folds. Oil and gas production is generally restricted to these anticlinal crests within Paleozoic rocks. Deep wells (> 6000 m) that have penetrated footwall imbricates of the mountain flank thrusts have drilled through steep-overturned beds and tight recumbent folds before passing through faults into a normal stratigraphic sequence. Basement thrust loading of the southern margin of the Anadarko basin controlled the trend (west-northwest-east-southeast) of the axis of maximum deposition within the basin during the Pennsylvanian.
Basement
Thrust fault
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Accretionary wedge
Anticline
Forearc
Mass wasting
Thrust fault
Seafloor Spreading
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Décollement
Accretionary wedge
Thrust fault
Trough (economics)
Anticline
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Sequence (biology)
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Mineral resource classification
Open Pit Mining
Stoping
Surface mining
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