Turbidite

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    Introduction The Pennsylvania Jackfork Group is located in the Ouachita Mountains, occupying Arkansas and Oklahoma. Several authors interpreted the Pennsylvania Jackfork Group as a classic flysch sequence in a submarine fan setting, dominated by turbidites. Shanmugam and Moiola (1995) reveal contrary evidence for the origin of these beds. They interpret the origin of these beds to be from debris-flow, slump, and bottom-current because slabbed samples from sedimentary features appear “massive” in outcrop, thin sections show variation in vertical grain size, individual units contained in the matrix, and the use of the term “turbidite” in relationship to process sedimentology. The purpose of this paper was to create a depositional model for…

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    Great Valley Sequence

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    By dating ammonite fossils, we know that the Panoche Formation (Mid-Cretaceous) is older than the Moreno formation. The conglomerates’ clasts have sizes around 5cm in diameter and they are round to sub-angular. Mineralogy of the clasts includes slightly metamorphosed felsic extrusive igneous rocks (rhyolite to dacite), metamorphic rocks (quartzite) that have high T/P ratios, greywacke, and chert. The source of the clasts might be a continental crust. The Panoche Formation was part of the…

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    Antler Orogeny Model

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    enclaved region (1) Antler related rocks slightly changed from their Mississippian positions compare to the subjacent Paleozoic shelf rocks. (2) The eastern limit of the lower Paleozoic oceanic rocks is the approximate trace of the Roberts mountains thrust, and (3) if a regional Mesozoic decollement extends from eastern to western Nevada, it lies deeply within or below the Paleozoic shelf succession. In addition, the position and extent of the Antler orogeny is uncertain outside the central…

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    Ely Copper Mine Case Study

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    Schoolhouse Brook borders Ely Mine at the south and the mine site runs roughly parallel to Ely Brook. Bedrock Geology Three bedrock formations underlie the Orange County copper district: the Waits River Formation, Standing Pond Volcanics, and the Gile Mountain Formation. Figure 4 outlines the boundaries of these formations. The Waits River Formation consists of metamorphosed carbonate and siliciclastic turbidites formed during the Early to Middle Silurian age. These deposits are the oldest, as…

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    with the north part characterised by lacustrine sediments consisting of sandstone and mudstone are interbedded with clastic rocks and volcanic rocks for example Rungwe volcanic shown in figure 2.2 (Ebinger, 1989). According to (Crossley, 1984) initial rifting started during Miocene age with earliest Cenozoic deposits ( figure 2.2 ) of lacustrine sediments occurring at the same time and initial subsidence of the rift during Pliocene age. The geological age present includes Cretaceous, Neogene,…

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