The rock and stone terms limestone and marble

Brooks, Harold K.

doi:10.2475/ajs.252.12.755

Cited by 2 publications

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“…Schist of various types is the most widespread metamorphic rock in the Imuruk Lake area. The schist unit is thick, and its lithology is varied; it probably includes rocks younger than, older than, 31 have adopted Brooks' (1954) suggestion that the term "metallmestone" be applied to metamorphosed rocks composed dominantly of calcite and that "marble" be reserved as a commercial term designating carbonate rock suitable for use as dimension stone.…”

Section: Schist Unitmentioning

confidence: 99%

Geology of the Imuruk Lake area, Seward Peninsula, Alaska

Hopkins¹

1963

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The Imuruk Lake area is underlain by metamorphic rocks of Paleozoic age, granitic rocks of probable Late Jurassic or Early Cretaceous age, and sediments and lava flows of late Cenozoic age. The Paleozoic metamorphic rocks include schist of several types assignable to Eskola's green-schist facies, gneiss assignable to Eskola's amphibolite facies, and metalimestone. The schist unit includes rocks that are older and younger than the metalimestone unit. The rocks of the gneiss unit are believed to be stratigraphically equivalent to part of the rocks in the schist unit and to have acquired much of their present texture and mineralogy during the emplacement of the Kuzitrin Lake batholith. The granitic rocks of probable late Mesozoic age include the small Black Butte stock and the Kuzitrin Lake batholith, a large body of granitic rocks exposed in the northern Bendeleben Mountains south of Kuzitrin Lake that apparently extends northward beneath the Imuruk Lake lava plateau to the Asses Ears. The Kougarok gravel of late Tertiary and Pleistocene (?) age underlies the northwestern part of the Kuzitrin flats and consists of a basal gravel member locally more than 187 feet thick, a thin middle member composed of peaty lignite, and an upper gravel member 3 to 60 feet thick. The middle member contains a rich pollen and wood flora consisting of a mixture of coniferous and deciduous trees, including representatives of several genera that now reach.their northern limits in latitudes 5° to 15° south of Seward Peninsula. Similar pollen floras in the valley of the Aldan River, Yakutia, Siberia, and in the northern Alaska Range are of late Miocene or early Pliocene age. The upper member contains poplar and either spruce or larch wood and may be early Pleistocene in age. Pleistocene sediments include glacial deposits, windblown silt, stratified silt and peat, alluvial gravel, and lacustrine sediments. Till and outwash of the Nome River (Illinoian) and Salmon Lake (Wisconsin) glaciations are found in and along the north front of the Bendeleben Mountains. Windblown silt covers the pre-Cenozoic rocks, the Kougarok gravel, and the older lava flows throughout much of the Imuruk Lake area. The stratified silt and peat consists largely of windblown silt that has been washed downslope to form fans, aprons, and in places valley-fill deposits. The alluvial gravel underlies the.flood plains and low terraces of the larger streams. Cl C2 CONTRIBUTIONS TO GENERAL GEOLOGY Lake deposits are found in the many existing lakes and in the basins of several large filled or drained lakes. Imuruk Lake is adjoined by three systems of abandoned shoreline features consisting of wave-cut scarps, and of terraces composed of beach gravel, and lacustrine silt and peat. The two older systems, formed during the Nome River (Illinoian) and Salmon Lake (Wisconsin) glaciations, have been irregularly warped; the youngest system, formed in Recent time, is virtually horizontal. Imuruk Lake drained westward to the Noxapaga River when the older shorelines were occupied; its pr...

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Section: Schist Unitmentioning

confidence: 99%

Geology of the Imuruk Lake area, Seward Peninsula, Alaska

Hopkins¹

1963

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“…The commercial marble includes both metamorphic (true) and sedimentary rocks that take polish and have enough beauty to be used as ornamental stone. Chook, (1954) [1], used the term orthomarble for limestone that can be used for decoration. In this paper the term marble is used as a scientific term for only true marble including skarn type.…”

Section: Introductionmentioning

confidence: 99%

Origin of Structures and Textures of some Kurdistan Marbles as Inferred from Sedimentary Ancestor Structures, NE-Iraq

Karim¹

2003

JZS

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The Quarries of Iraqi Kurdistan metamorphic marbles (true marble) are distributed along a belt near and parallel to the Iranian border in northeastern Iraq. These marbles associated with low-grade pelitic and calc-schist (green schist facies) and phyllite. They are formed by regional metamorphism of different types of sedimentary parent rocks in an environment not exceeded that of green schist facies (400 C o and 8kb). The pelitic equivalent of the Kurdistan calcitic marble contains chlorite, albite, muscovite and biotite. In the latter years, their economic value is rapidly increased as their polished slabs extensively used for decoration purpose. The beautiful features of these marbles are consisting of sophisticated mesoscopic structures of different shapes, size and colors originated from plastic flowage and mixing of different composition and impurities reflecting either the original depositional or diagenetically-introduced materials. Before plastic flowage they suffered from burial and tectonic fracturing which later filled with spary calcite. The origin of the marbles is analyzed according to the stage of paragenesis of the structures such as foliation, banding (layering) and flow structure. The field and lab studies proved that they are all returned to relict of primary and secondary (diagenetic) sedimentary structures. The marbles suffered from various degrees of tendency toward homogenization as the grade of regional metamorphism progressed, this reflected by mixing of foreground and background together. In addition to diffused boundary of contrasting components. Although they resemble the banded and augen gneisses but no ones are formed by metamorphic differentiation. Most of the precursor structures are related to pressure solution seams and stylolites, which are combined with the triangle of Walness which deal with solution seams. Other structures are returned to lamination of the sedimentary parent rocks. Finally the probable stratigraphic unit as the original parent rocks is discussed.

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The rock and stone terms limestone and marble

Cited by 2 publications

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Geology of the Imuruk Lake area, Seward Peninsula, Alaska

Geology of the Imuruk Lake area, Seward Peninsula, Alaska

Origin of Structures and Textures of some Kurdistan Marbles as Inferred from Sedimentary Ancestor Structures, NE-Iraq

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