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Dublin Core
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Title
A name given to the resource
607_Dolerite_1
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Omeka Image File
The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files.
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https://geosciencecollections.milne-library.org/files/original/5f0d09fb7a4dbd443eea7e2021c4bd54.JPG
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Omeka Image File
The metadata element set that was included in the `files_images` table in previous versions of Omeka. These elements are common to all image files.
Width
2560
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1920
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
(KBR) Karroo Igneous Complex -- Birds River, South Africa
Description
An account of the resource
The Birds River Complex is a "Bell-Jar" intrusion first described by du Toit in 1905 and then by Ealey and Robey in 1976. One of the best exposed sections across the margin of the complex is on the farm Denwood, in the southwestern corner of the complex. The samples were collected from a mafic intrusion near Denwood farm. These samples from the Karroo Complex were collected from the previously studied section of the complex and neighboring areas.
Contributor
An entity responsible for making contributions to the resource
Dr. Brian Lock, Rhodes University
Western Minerals, Inc.
References
A related resource that is referenced, cited, or otherwise pointed to by the described resource.
<strong>Start Here:<br /></strong>Cox, K.G., 1972, The Karroo Volcanic Cycle: Journal of the Geological Society, v. 128, p. 311-336.<span class="cit-sep cit-sep-after-article-pages"><span class="cit-sep cit-sep-after-article-pages">Â doi: 10.1144/gsjgs. 128.4.0311.<br /></span></span>
<ul><li>The petrogenesis of the Mesozoic igneous rocks of south-Eastern Africa is related to the tectonic event believed to be the initiation of the break up of Gondwanaland. The cycle began with the rise of potassium-rich picritic magma, the source material for rocks of the northern province, Rhodesia. On top of and peripheral to the main magma body, a zone of sodic magma was generated and formed some of the rocks of the north and most southern rocks.</li>
</ul><span class="cit-sep cit-sep-after-article-pages"><span class="cit-sep cit-sep-after-article-pages"><span class="cit-sep cit-sep-after-article-pages"><br /><strong>Additional resources:<br /></strong>White, R.S., 1992, Magmatism During and After Continental Break-Up, Geological Society, London, Special Publications, v. 68, p. 1-16. doi:Â <span>10.1144/GSL.SP.1992.068.01.0.<br /></span></span></span></span>
<ul><li>Magmatism that goes along with continental break-up is caused primarily by decompression melting of the underlying mantle as it rises up beneath the rift. The amount of melt produced is determined by the asthenospheric mantle temperature and on the rate of rifting. </li>
</ul><span class="cit-sep cit-sep-after-article-pages"><span class="cit-sep cit-sep-after-article-pages"><span class="cit-sep cit-sep-after-article-pages"><span>Eales, H.V., and van Robey, J.A., 1976, Differentiation of Tholeiitic Karroo Magma at Birds River, South Africa, Contributions to Mineralogy and Petrology 10. v. 56, p. 101-117. doi:Â <span>10.1007/BF00375423<br /></span></span></span></span></span>
<ul><li>Strongly fractionated residue from the partial crystallization of tholeiitic gabbroic magma was emplaced at depth within sediment of the upper part of the Karroo succession. The residue was most likely tapped from a deeper intrusion during cauldron subsidence, but was engulfed by a later intrusion of olivine gabbro on a large scale.</li>
</ul>
Walker, F., and Poldervaart, A., 1949, Karroo Dolerites of the Union of South Africa, Geological Society of America Bulletin, v. 60, p. 591-706. doi: 10.1130/0016-7606(1949)60<span>[591:KDOTUO]2.0.CO;2</span><br /><ul><li>The Karroo dolerites are the result of the intrusive phase of the early Jurassic basalts that built up the Basutoland lava plateau. Most of the dolerites show little differentiation but olivine rich types and acidic veins have been recorded. The magma had an effect on the sedimentary rocks; many of the rocks described as granophyre were found to be transformed siltstone. The dolerites occur as sills and dikes but "bell-jar inclusions" occur (the Bird's River complex is a bell jar shaped inclusion). </li>
</ul>
Eales, H.V., and Booth P.W.K., 1974, The Birds River Gabbro Complex, Dordrecht District, Transactions of the Geological Society of South Africa, v. 77, p. 1-15.<br /><ul><li>On the gabbros of the Birds River Complex.</li>
</ul>
Rock
A physical material with a mineral composition.
Unit
Formation or other descriptive rock category
Lesotho Formation
Number of Thin Sections
Number of thin sections associated with this sample
1
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Dolerite
Alternative Title
An alternative name for the resource. The distinction between titles and alternative titles is application-specific.
Diabase or Microgabbro
Description
An account of the resource
This is dolerite from the "Dragon's Back" dyke, from the farm Romance. It is the youngest dolerite body in the area and contains biotite and hornblende. Emplacement of this dolerite took place at a much deeper crustal level than the gabbros. It has an aphanitic- porphyritic texture and is holocrystalline. The groundmass is light gray and subhedral. It contains slightly darker gray fine grained subhedral phenocrysts that comprise 30% of the dolerite. There is pinkish- brown blotchy weathering.
The thin sections are shown in plain polarized light and cross polarized light at a magnification of 400x and contains 60% plagioclase, 35% pyroxenes, and 5% opaques.
Abstract
A summary of the resource.
<span>Differentiation of tholeiitic Karroo magma at Birds River, South Africa</span>
Date
A point or period of time associated with an event in the lifecycle of the resource
No date given.
Contributor
An entity responsible for making contributions to the resource
Western Minerals, Inc.
Is Part Of
A related resource in which the described resource is physically or logically included.
http://www.geosciencecollections.milne-library.org/collections/show/17
Identifier
An unambiguous reference to the resource within a given context
KBR-18
Spatial Coverage
Spatial characteristics of the resource.
Karoo- Birds River, Eastern Cape, South Africa
Temporal Coverage
Temporal characteristics of the resource.
183-179 Ma (Jurassic)
Accrual Method
The method by which items are added to a collection.
Purchased from Western Minerals. Inc.
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Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
(NAO) Ophiolite Suite -- Northern Apennines, Italy
Description
An account of the resource
The suite consists of samples from an ophiolite suite that outcrops in 3 locations in the Apennine mountain range in northern Italy. The units are severely imbricated and folded. The units are Cretaceous-Eocene in age. The units consist of ultramafic rock, gabbro and peridotite instrusions, and basaltic magmas.
Contributor
An entity responsible for making contributions to the resource
Western Minerals, Inc.
Spatial Coverage
Spatial characteristics of the resource.
Northern Apennines, Liguria Region, Italy<br />Samples 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, and 15 are taken from the region around Bargone, Italy<br />Samples 14, 16, 17, 18, 19, 20, and 21 are taken from the region around Sassello, Italy<br />Sample 22 is taken from outside Genoa, Italy
Date
A point or period of time associated with an event in the lifecycle of the resource
1982
Is Part Of
A related resource in which the described resource is physically or logically included.
<a href="http://geosciencecollections.milne-library.org/" target="_blank">The Geneseo Geoscience Collection</a>
Identifier
An unambiguous reference to the resource within a given context
NAO-01 to NAO-22
Temporal Coverage
Temporal characteristics of the resource.
Triassic - Eocene
Accrual Method
The method by which items are added to a collection.
Purchased by Western Minerals, Inc.
References
A related resource that is referenced, cited, or otherwise pointed to by the described resource.
<strong>Start Here:<br /></strong><span class="cit-auth cit-auth-type-author">Lagabrielle, Y.,</span><span class="cit-sep cit-sep-two-item-separator">Â and Cannat, M., 1990, </span><span class="cit-title">Alpine Jurassic ophiolites resemble the modern central Atlantic basement: Geology, v. 18, p. 319-322<br /></span>Link:Â <a href="http://geology.geoscienceworld.org/content/18/4/319.full.pdf" target="_blank">GeoScienceWorld</a><br /><ul><li>This fairly short article gives some insight into the development of the North Apennine Ophiolites with a fairly recent view on the matter.</li>
</ul><strong><br />Additional Resources</strong><strong>:</strong><br />Garuti, G., and Zaccarini, F., 2005, Minerals of Au, Ag and U in Volcanic-Rock-Associated Massive Sulfide Deposits of the Northern Apennine Ophiolite, Italy: The Canadian Mineralogist, v. 43, p. 935-950<br />DOI: <a href="http://dx.doi.org/10.2113/gscanmin.43.3.935" target="_blank">10.2113/gscanmin.43.3.935</a><br /><ul><li>This article explores the elemental composition of the North Apennine Ophiolite sequence and uses that to determine previous geologic events.</li>
</ul>
Garuti, G., Zaccarini, F., Scacchetti, M., and Bartoli, O., 2011, The Pb-rich sulfide veins in the Boccassuolo ophiolite: Implications for the geochemical evolution of the hydrothermal activity across the ocean-continent transition in the Ligurian Tethys (Northern-Apennine, Italy): Lithos, v. 124, p. 243-254<br />DOI:Â <a title="10.1016/j.lithos.2010.11.006" href="http://dx.doi.org/10.1016/j.lithos.2010.11.006" target="_blank">10.1016/j.lithos.2010.11.006</a><br /><ul><li>This article explores the chemical composition of the ophiolite sequence under a different name and ties it into the formation history.</li>
</ul>
Garzanti, E., Canclini, S., Foggia, F.M., and Petrella, N., 2002, Unraveling Magmatic and Orogenic Provenance in Modern Sand: The Back-Arc Side of the Apennine Thrust Belt, Italy: Journal of Sedimentary Research, v. 72, p. 2-17<br />DOI:Â <a title="10.1306/051801720002" href="http://dx.doi.org/10.1306/051801720002" target="_blank"><span>10.1306/051801720002</span></a><br /><ul><li>This article goes into great detail on the provenance characteristics for a number of sands. including sands originating from the North Apennine Ophiolite sequence.</li>
</ul>
Cibin, U., Spadafora, E., Zuffa, G.G., and Castellarin, A., 2001, Continental collision history from arenites of episutural basins in the Northern Apennines, Italy: Geological Society of America Bulletin, v. 113, p. 4-19<br />Link: <a title="GeoScienceWorld" href="http://bulletin.geoscienceworld.org/content/113/1/4.full.pdf" target="_blank">GeoScienceWorld</a><br /><ul><li>This article goes into detail about the deformations experienced by the North Apennine Ophiolites after the Eocene.</li>
</ul>
Rock
A physical material with a mineral composition.
Number of Thin Sections
Number of thin sections associated with this sample
1
Dublin Core
The Dublin Core metadata element set is common to all Omeka records, including items, files, and collections. For more information see, http://dublincore.org/documents/dces/.
Title
A name given to the resource
Dolerite
Description
An account of the resource
Doleritic basalt with metamorphic overimprinting in prehnite-pumpellyite facies.
Primary minerals: plagioclase, titanaugite, ilmenite, olivine.
Metamorphic paragenesis: albite, pumpellyite, prehnite, sphene, chlorite.
Date
A point or period of time associated with an event in the lifecycle of the resource
no date
Contributor
An entity responsible for making contributions to the resource
Western Minerals Inc.
Is Part Of
A related resource in which the described resource is physically or logically included.
<a href="http://www.geosciencecollections.milne-library.org/items/show/34">Northern Apennines Ophiolites Western Minerals Supplementary Information</a>
Identifier
An unambiguous reference to the resource within a given context
NAO-13
Spatial Coverage
Spatial characteristics of the resource.
Levanto, Italy
Accrual Method
The method by which items are added to a collection.
Purchased from Western Minerals Inc.
Alternative Title
An alternative name for the resource. The distinction between titles and alternative titles is application-specific.
Basalt
Temporal Coverage
Temporal characteristics of the resource.
Cretaceous-Eocene