Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry

The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites we...
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Autor*in:	Karup-Møller, Sven [verfasserIn] Makovicky, Emil Bailey, John C Frei, Robert

Format:	Artikel
Sprache:	Englisch

Erschienen:	2016

Schlagwörter:	imperial porphyry pb-pb diagrams nd-sm data greenschist facies piemontite rb-sr data dokhan volcanics red sea mountains

Übergeordnetes Werk:	Enthalten in: Neues Jahrbuch für Mineralogie / Abhandlungen - Stuttgart : Schweizerbart, 1950, 193(2016), 1, Seite 29
Übergeordnetes Werk:	volume:193 ; year:2016 ; number:1 ; pages:29

Links:	Volltext

DOI / URN:	10.1127/njma/2015/0290

Katalog-ID:	OLC1973793571

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520			\|a The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites were treated in Part I of this report. The rocks were moderately altered ; greenschist facies alteration took place under essentially isochemical conditions but relatively high oxygen fugacity. The rocks retain many magmatic textures. Whole-rock chemical analyses show that we deal with high-K to medium-K calc-alkaline andesites and dacites with a trace- element spectrum typical of volcanic rocks from an Andean subduction-zone setting. Four rock samples yielded an errorchron with an age of 560 ± 42 Ma and an initial 87 Sr/ 86 Sr ratio of 0.70283 ± 0.00011. Using Nd isotope data, values of TDM from 0.84 to 0.88 Ga and εNd from +5.1 to +5.7 were inferred. The magmas which led to formation of the Imperial Porphyry appear to be derived from a subduction-modified depleted mantle and underwent only minor contamination by older continental crust. Trace-element features, notably the high Th, U, K, Rb and Cs contents, are consistent with crust contamination. Imperial Porphyry erupted during the second Great Oxygenation Event of the Earth atmosphere. Mineralogical observations as well as rock colour and texture, particularly the pleochroic epidote – piemontite, should allow archaeologists to reliably assign pieces of Imperial Porphyry to their Egyptian source. Major- and trace-element rock analysis or electron microprobe mineral analysis will confirm the assignment.
650		4	\|a imperial porphyry
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spelling	10.1127/njma/2015/0290 doi PQ20160430 (DE-627)OLC1973793571 (DE-599)GBVOLC1973793571 (PRQ)s682-c4dbea0297d305fea9c91af00959c00c05ce7b84a35a113dbb9d92aaf46262220 (KEY)0064947320160000193000100029imperialporphyryfromgebelabudokhantheredseamountai DE-627 ger DE-627 rakwb eng 540 DNB 550 AVZ Karup-Møller, Sven verfasserin aut Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry 2016 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites were treated in Part I of this report. The rocks were moderately altered ; greenschist facies alteration took place under essentially isochemical conditions but relatively high oxygen fugacity. The rocks retain many magmatic textures. Whole-rock chemical analyses show that we deal with high-K to medium-K calc-alkaline andesites and dacites with a trace- element spectrum typical of volcanic rocks from an Andean subduction-zone setting. Four rock samples yielded an errorchron with an age of 560 ± 42 Ma and an initial 87 Sr/ 86 Sr ratio of 0.70283 ± 0.00011. Using Nd isotope data, values of TDM from 0.84 to 0.88 Ga and εNd from +5.1 to +5.7 were inferred. The magmas which led to formation of the Imperial Porphyry appear to be derived from a subduction-modified depleted mantle and underwent only minor contamination by older continental crust. Trace-element features, notably the high Th, U, K, Rb and Cs contents, are consistent with crust contamination. Imperial Porphyry erupted during the second Great Oxygenation Event of the Earth atmosphere. Mineralogical observations as well as rock colour and texture, particularly the pleochroic epidote – piemontite, should allow archaeologists to reliably assign pieces of Imperial Porphyry to their Egyptian source. Major- and trace-element rock analysis or electron microprobe mineral analysis will confirm the assignment. imperial porphyry pb-pb diagrams nd-sm data greenschist facies piemontite rb-sr data dokhan volcanics red sea mountains Makovicky, Emil oth Bailey, John C oth Frei, Robert oth Enthalten in Neues Jahrbuch für Mineralogie / Abhandlungen Stuttgart : Schweizerbart, 1950 193(2016), 1, Seite 29 (DE-627)129304662 (DE-600)123943-0 (DE-576)014499770 0077-7757 nnns volume:193 year:2016 number:1 pages:29 http://dx.doi.org/10.1127/njma/2015/0290 Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC SSG-OLC-GEO SSG-OPC-GGO GBV_ILN_21 GBV_ILN_24 GBV_ILN_30 GBV_ILN_65 GBV_ILN_70 GBV_ILN_188 GBV_ILN_2004 GBV_ILN_2008 GBV_ILN_2010 GBV_ILN_2015 GBV_ILN_2018 GBV_ILN_2027 GBV_ILN_2173 GBV_ILN_2346 GBV_ILN_4046 GBV_ILN_4277 AR 193 2016 1 29
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author	Karup-Møller, Sven
spellingShingle	Karup-Møller, Sven ddc 540 ddc 550 misc imperial porphyry misc pb-pb diagrams misc nd-sm data misc greenschist facies misc piemontite misc rb-sr data misc dokhan volcanics misc red sea mountains Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry
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topic_title	540 DNB 550 AVZ Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry imperial porphyry pb-pb diagrams nd-sm data greenschist facies piemontite rb-sr data dokhan volcanics red sea mountains
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title	Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry
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title_full	Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry
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title_sort	imperial porphyry from gebel abu dokhan, the red sea mountains, egypt part ii. geochemistry
title_auth	Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry
abstract	The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites were treated in Part I of this report. The rocks were moderately altered ; greenschist facies alteration took place under essentially isochemical conditions but relatively high oxygen fugacity. The rocks retain many magmatic textures. Whole-rock chemical analyses show that we deal with high-K to medium-K calc-alkaline andesites and dacites with a trace- element spectrum typical of volcanic rocks from an Andean subduction-zone setting. Four rock samples yielded an errorchron with an age of 560 ± 42 Ma and an initial 87 Sr/ 86 Sr ratio of 0.70283 ± 0.00011. Using Nd isotope data, values of TDM from 0.84 to 0.88 Ga and εNd from +5.1 to +5.7 were inferred. The magmas which led to formation of the Imperial Porphyry appear to be derived from a subduction-modified depleted mantle and underwent only minor contamination by older continental crust. Trace-element features, notably the high Th, U, K, Rb and Cs contents, are consistent with crust contamination. Imperial Porphyry erupted during the second Great Oxygenation Event of the Earth atmosphere. Mineralogical observations as well as rock colour and texture, particularly the pleochroic epidote – piemontite, should allow archaeologists to reliably assign pieces of Imperial Porphyry to their Egyptian source. Major- and trace-element rock analysis or electron microprobe mineral analysis will confirm the assignment.
abstractGer	The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites were treated in Part I of this report. The rocks were moderately altered ; greenschist facies alteration took place under essentially isochemical conditions but relatively high oxygen fugacity. The rocks retain many magmatic textures. Whole-rock chemical analyses show that we deal with high-K to medium-K calc-alkaline andesites and dacites with a trace- element spectrum typical of volcanic rocks from an Andean subduction-zone setting. Four rock samples yielded an errorchron with an age of 560 ± 42 Ma and an initial 87 Sr/ 86 Sr ratio of 0.70283 ± 0.00011. Using Nd isotope data, values of TDM from 0.84 to 0.88 Ga and εNd from +5.1 to +5.7 were inferred. The magmas which led to formation of the Imperial Porphyry appear to be derived from a subduction-modified depleted mantle and underwent only minor contamination by older continental crust. Trace-element features, notably the high Th, U, K, Rb and Cs contents, are consistent with crust contamination. Imperial Porphyry erupted during the second Great Oxygenation Event of the Earth atmosphere. Mineralogical observations as well as rock colour and texture, particularly the pleochroic epidote – piemontite, should allow archaeologists to reliably assign pieces of Imperial Porphyry to their Egyptian source. Major- and trace-element rock analysis or electron microprobe mineral analysis will confirm the assignment.
abstract_unstemmed	The prestigious red Imperial Porphyry was quarried from Mons Porphyrites in the Red Sea Mountains of Egypt. It was reserved for imperial use in Rome and Constantinople and widely reused in Romanesque and Renaissance times. The mineralogy and petrology of the porphyry collected at Mons Porphyrites were treated in Part I of this report. The rocks were moderately altered ; greenschist facies alteration took place under essentially isochemical conditions but relatively high oxygen fugacity. The rocks retain many magmatic textures. Whole-rock chemical analyses show that we deal with high-K to medium-K calc-alkaline andesites and dacites with a trace- element spectrum typical of volcanic rocks from an Andean subduction-zone setting. Four rock samples yielded an errorchron with an age of 560 ± 42 Ma and an initial 87 Sr/ 86 Sr ratio of 0.70283 ± 0.00011. Using Nd isotope data, values of TDM from 0.84 to 0.88 Ga and εNd from +5.1 to +5.7 were inferred. The magmas which led to formation of the Imperial Porphyry appear to be derived from a subduction-modified depleted mantle and underwent only minor contamination by older continental crust. Trace-element features, notably the high Th, U, K, Rb and Cs contents, are consistent with crust contamination. Imperial Porphyry erupted during the second Great Oxygenation Event of the Earth atmosphere. Mineralogical observations as well as rock colour and texture, particularly the pleochroic epidote – piemontite, should allow archaeologists to reliably assign pieces of Imperial Porphyry to their Egyptian source. Major- and trace-element rock analysis or electron microprobe mineral analysis will confirm the assignment.
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title_short	Imperial Porphyry from Gebel Abu Dokhan, the Red Sea Mountains, Egypt Part II. Geochemistry
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