Laser 40Ar/39Ar ages of single detrital white mica grains related to the exhumation of Neoproterozoic and Late Devonian high pressure rocks in the Southern Urals (Russia)

2004 ◽  
Vol 141 (2) ◽  
pp. 161-172 ◽  
Author(s):  
A. P. WILLNER ◽  
J.-A. WARTHO ◽  
U. KRAMM ◽  
V. N. PUCHKOV
Keyword(s):  
High Pressure ◽  
Southern Urals ◽  
White Mica ◽  
Late Devonian ◽  
Chemical Compositions ◽  
Age Group ◽  
Formula Unit ◽  
The Southern Urals ◽  
Source Areas ◽  
Upper Vendian

Single grains of detrital white mica from two different synorogenic sediments in the Southern Urals were analysed using the in situ ultraviolet laser ablation Ar–Ar dating technique to discriminate between age signatures associated with a high-pressure signal (phengites) from those related to muscovite only. Two disparately aged sandstone formations of Neoproterozoic (Upper Vendian) and Upper Devonian (Famennian) age were formed by the erosion of high-relief source areas with contemporaneously exhumed high-pressure rocks. A bimodal distribution of ages and chemical compositions can be detected in the two detrital populations. There is no age overlap between the two populations, reflecting completely different source areas containing high-pressure rocks of different ages. Within the Upper Vendian sandstones, detrital white mica from a 571–609 Ma age group is phengitic in composition (Si 3.3–3.41 per formula unit), while an older 645–732 Ma age group is comprised of muscovite composition grains only. The first group is compatible with the time of late exhumation and emplacement of a source area containing high-pressure rocks, the Neoproterozoic Beloretzk terrane. The older age range is compatible with a long history of cooling and the allochthonous nature of this terrane. Detrital white mica from the Famennian sandstones (Zilair Formation) comprises one age group (342–421 Ma) containing phengite (Si 3.21–3.39 per formula unit) and muscovite, and a second group (446–496 Ma) containing muscovite only. While the derivation of the second group cannot be correlated with any as yet known regional data, the first age group indicates the earliest arrival of high-pressure rocks at the surface along the suture zone after Late Devonian arc–continent collision.

Uranium-Bearing Srilankite from High-Pressure Garnetites of the Southern Urals: First Data

2018 ◽  
Vol 479 (2) ◽  
pp. 529-533
Author(s):  
I. A. Gottman ◽  
E. V. Pushkarev ◽  
V. V. Khiller
Keyword(s):  
High Pressure ◽  
Southern Urals ◽  
The Southern Urals

Russian Devonian brachiopod genera Cyrtinoides and Komiella in North America

1993 ◽  
Vol 67 (6) ◽  
pp. 952-958 ◽  
Author(s):  
J. G. Johnson ◽  
R. B. Blodgett
Keyword(s):  
New Species ◽  
North America ◽  
Carbonate Platform ◽  
Southern Urals ◽  
Late Devonian ◽  
Western North America ◽  
The Southern Urals ◽  
New Family ◽  
Marine Migration ◽  
Subjective Synonym

The Middle Devonian brachiopod genus Cyrtinoides, described from the southern Urals, is a senior subjective synonym of Mucroclipeus, previously known only from eastern and western North America. The Middle and Late Devonian cyrtinid brachiopod genus Komiella, previously known only from the Timan Range of eastern Europe, is identified from west-central Alaska and Nevada. A new family Komiellidae is proposed. New species are Komiella gilberti, K. magnasulca, and K. stenoparva. Known species of both genera occupy carbonate platform foreslope facies or shelf basins, allowing open marine migration via peripheral biofacies.

Sm-Nd and Rb-Sr dating of high-pressure metagranites in the East Ural uplift, the Southern Urals

2006 ◽  
Vol 406 (1) ◽  
pp. 148-152 ◽  
Author(s):  
T. A. Osipova ◽  
V. M. Gorozhanin ◽  
Yu. V. Gol’tsman ◽  
V. I. Vinogradov ◽  
M. I. Bujakaite
Keyword(s):  
High Pressure ◽  
Southern Urals ◽  
The Southern Urals

A model of Palaeozoic obduction and exhumation of high-pressure/low-temperature rocks in the southern Urals

1997 ◽  
Vol 276 (1-4) ◽  
pp. 217-227 ◽  
Author(s):  
Alexandre Chemenda ◽  
Philippe Matte ◽  
Vadim Sokolov
Keyword(s):  
High Pressure ◽  
Low Temperature ◽  
Southern Urals ◽  
The Southern Urals

Biostratigraphy and taxonomy of fusulinid foraminifera across the Upper Mississippian (upper Serpukhovian)–Lower Pennsylvanian (Bashkirian) successions from the Hadim Nappe, Central Taurides, southern Turkey

2021 ◽  
pp. 1-21
Author(s):  
Melikan Akbaş ◽  
Cengiz Okuyucu
Keyword(s):  
New Species ◽  
Shallow Water ◽  
Late Cretaceous ◽  
Depositional Environment ◽  
Southern Urals ◽  
Russian Platform ◽  
Late Devonian ◽  
The Southern Urals ◽  
Southern Turkey ◽  
Stratigraphic Succession

Abstract The Hadim Nappe, which is one of the allochthonous tectonic units in the Tauride Belt, in southern Turkey, includes a continuous stratigraphic succession from the Middle(?)–Late Devonian to Late Cretaceous. A relatively complete succession of the upper Serpukhovian to Bashkirian is exposed in the Central Taurides, where two sections (Yassıpınar and Gölbelen) have been selected for detailed biostratigraphic investigations. The Mississippian-Pennsylvanian boundary in these sections was determined by the first appearance datum of the Plectostaffella jakhensis and located in the oolitic limestone facies indicating a shallow-water depositional environment. The uppermost Serpukhovian and regional Bashkirian substages (Syuranian, Akavasian, Askynbashian, and Arkhangelskian) were determined by index taxa, namely Plectostaffella jakhensis, P. bogdanovkensis, P. varvariensis, Pseudostaffella antiqua, Staffellaeformes staffellaeformis, Tikhonovichiella tikhonovichi, and Verella spicata. Fifty fusulinid species belonging to fourteen genera were determined in two sections, in which two species are new: Depratina turani Akbaş new species and Tikhonovichiella praetikhonovichi Akbaş new species. The taxonomic positions of two fusulinid species (Depratina convoluta n. comb. and Staffellaeformes parva robusta n. comb.) are revised. The studied fusulinid assemblages correlate with fusulinid assemblages from the southern Urals, Russian Platform, Donetz Basin, Darvaz, Spain, central Iran, and some other regions of the Tethyan Realm. UUID: http://zoobank.org/bcbb6c72-f6f9-4e77-9cf9-3572bd731ff3

Volcanism of the transitional stage from the Late Devonian island arc to Early Carboniferous rifts in the Southern Urals

2008 ◽  
Vol 63 (6) ◽  
pp. 359-367 ◽  
Author(s):  
N. V. Pravikova ◽  
E. A. Matveeva ◽  
Al. V. Tevelev ◽  
A. B. Veimarn ◽  
A. V. Rudakova
Keyword(s):  
Early Carboniferous ◽  
Southern Urals ◽  
Island Arc ◽  
Late Devonian ◽  
Transitional Stage ◽  
The Southern Urals

scholarly journals Metallurgical Slags and Ore Fragments from the Kamenny Ambar Bronze Age Settlement (Southern Urals): a Key to Knowledge of Copper Sources

2021 ◽  
Vol 33 (1) ◽  
pp. 34-57
Author(s):  
Ankushev M. ◽  
◽  
Zaykov V. ◽  
Molchanov I. ◽  
Koryakova L. ◽  
...  
Keyword(s):  
Bronze Age ◽  
Massive Sulfide ◽  
Southern Urals ◽  
Raw Material ◽  
Chemical Compositions ◽  
Russian Science ◽  
The Southern Urals ◽  
Copper Ore ◽  
Porphyry Deposits ◽  
Metallurgical Slags

Abstract: The paper presents the characteristics of metallurgical slags and copper ore fragments from the Kamenny Ambar settlement of the Bronze Age. According to the mineral and chemical compositions we have distinguished two types of the slags: Cr-rich spinel containing olivine slags and sulfide-containing olivine slags. The Cr-rich spinel containing olivine slags are the product of oxidized ore from the copper deposits in ultramafic rocks exploited in the early Sintashta-Petrovka period the settlement functioning. The sulfide-containing olivine slags are the result of the secondary sulfide ores from the massive-sulfide, and less likely copper porphyry deposits during the latter Srubnaya-Alakul period. A similar change in the copper ore raw material type was also recorded in other Bronze Age settlements in the Southern Urals. In the Kamenny Ambar settlement and analogs, we have defined the main indicating minerals which allow us to determine the source for the Cu raw metal in historical time: Cr-rich spinels, sulfides, and tourmalines. Keywords: metallurgical slags, Bronze Age, Kamenny Ambar, South Ural, copper ores, mineral inclusions Acknowledgements: This work was supported by the Russian Science Foundation project No. 16–18– 10332‑P: analysis of slags and ores was carried out by M. N. Ankushev, V. V. Zaykov, A. M. Yuminov; the archaeological aspect of the work was analyzed by L. N. Koryakova, I. V. Molchanov (chronostratigraphic distribution of slags), S. E. Panteleeva (chronostratigraphic distribution of ceramics and ores). The authors are grateful to I. P. Alaeva, D. A. Artemyev, E. V. Belogub, A. V. Epimakhov, V. A. Kotlyarov, G. F. Lonschakova, M. S. Svirenko, L. G. Udachina. Filippova K. A., Khvorov P. V., Churin E. I., Sharapova S. V.

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