scholarly journals MIDDLE ARTINSKIAN (EARLY PERMIAN) ECOLOGICAL EVENT: A CASE STUDY OF THE URALS AND NORTHERN TIMAN

2001 ◽  
Vol 50 (2) ◽  
pp. 95
Author(s):  
E A Guseva ◽  
O L Kossovaya ◽  
A E Lukin ◽  
A V Zhuvarlev
Keyword(s):  
Early Permian ◽  
The Urals ◽  
Ecological Event

Copper-Gold Fertility of Arc Volcanic Rocks: A Case Study from the Early Permian Lizzie Creek Volcanic Group, NE Queensland, Australia

2020 ◽  
Author(s):  
Helge Behnsen ◽  
Carl Spandler ◽  
Isaac Corral ◽  
Zhaoshan Chang ◽  
Paul H.G.M. Dirks
Keyword(s):  
Major Element ◽  
Regional Scale ◽  
Volcanic Rocks ◽  
Early Permian ◽  
Magma Evolution ◽  
High Sulfidation ◽  
Volcanic Group ◽  
Volcanic Suite ◽  
Copper Gold

Abstract The Early Permian Lizzie Creek Volcanic Group of the northern Bowen Basin, NE Queensland, Australia, has compositions that range from basalt through andesite to rhyolite with geochemical signatures (e.g., enrichment in Cs, Rb, Ba, U, Th, and Pb, depletion in Nb and Ta) that are typical of arc lavas. In the Mount Carlton district the Lizzie Creek Volcanic Group is host to high-sulfidation epithermal Cu-Au-Ag mineralization, whereas farther to the south near Collinsville (~50 km from Mount Carlton) these volcanic sequences are barren of magmatic-related mineralization. Here, we assess whether geochemical indicators of magma fertility (e.g., Sr/Y, La/Yb, V/Sc) can be applied to volcanic rocks through study of coeval volcanic sequences from these two locations. The two volcanic suites share similar petrographic and major element geochemical characteristics, and both have undergone appreciable hydrothermal alteration during, or after, emplacement. Nevertheless, the two suites have distinct differences in alteration-immobile trace element (V, Sc, Zr, Ti, REE, Y) concentrations. The unmineralized suite has relatively low V/Sc and La/Yb, particularly in the high SiO2 rocks, which is related to magma evolution dominated by fractionation of clinopyroxene, plagioclase, and magnetite. By contrast, the mineralized suite has relatively high V/Sc but includes high SiO2 rocks with depleted HREE and Y contents, and hence high La/Yb. These trends are interpreted to reflect magma evolution under high magmatic H2O conditions leading to enhanced amphibole crystallization and suppressed plagioclase and magnetite crystallization. These rocks have somewhat elevated Sr/Y compared to the unmineralized suite, but as Sr is likely affected by hydrothermal mobility, Sr/Y is not considered to be a reliable indicator of magmatic conditions. Our data show that geochemical proxies such as V/Sc and La/Yb that are used to assess Cu-Au fertility of porphyry intrusions can also be applied to cogenetic volcanic sequences, provided elemental trends with fractionation can be assessed for a volcanic suite. These geochemical tools may aid regional-scale exploration for Cu-Au mineralization in convergent margin terranes, especially in areas that have undergone limited exhumation or where epithermal and porphyry mineralization may be buried beneath cogenetic volcanic successions.

Effects of diabase intrusions on surrounding clastic rock reservoir in early diagenetic stages: a case study of Early Permian Fencheng formation in the dabasong uplift, junggar basin

2021 ◽  
pp. 1-28
Author(s):  
Gangqiang Chen ◽  
Hailei Liu ◽  
Yuantao Tang ◽  
Zhijie Niu ◽  
Jing Yu ◽  
...  
Keyword(s):  
Mechanistic Model ◽  
Sedimentary Environment ◽  
Junggar Basin ◽  
Mafic Magma ◽  
Surrounding Rock ◽  
Early Permian ◽  
Magma Intrusion ◽  
Clastic Rock ◽  
Magmatic Intrusions

A stage of mafic magmatic activity occurred in Early Permian in the Dabasong Uplift of Junggar Basin, part of the magma intruded into the normal sedimentary and shallow buried fine sandstone to form diabase, and part of the magma erupted to form basalt. The surrounding fine sandstone just entered in the early diagenetic stage A when the magma intruded. The compaction of the surrounding clastic rock and rupture of a small number of clastic grains were caused by the extrusion of the magma intrusion. The presence of chemically deposited alkaline minerals such as calcite, dolomite, shortite, natural alkali, and northupite indicates an alkali lake sedimentary environment for the Fengcheng Formation. Primary alkaline minerals dissolved from the surrounding rocks were subsequently transported and precipitated to form cements. The formation of the calcite cements and calcite metasomatism resulted in considerable densification of the surrounding rock during early diagenesis and destruction of the reservoir quality. The mafic magma had abundant Fe2+ and Mg2+ ions and was deficient in K+ ions, resulting in large amounts of chlorite and iron precipitation in the surrounding rock mainly composed of clay. We have analyzed the influence of an ultrashallow intrusion on the surrounding clastic rock during the early diagenetic period, which provided a typical reference for establishing a systematic mechanistic model of how magmatic intrusions affect the surrounding rock.

A new mayfly species Triassodotes rasnitsyni sp. nov. of the family Misthodotidae Tillyard, 1932 (Insecta; Ephemerida, Permoplectoptera) from the Triassic deposits of Kuzbass, Russia

2021 ◽  
Vol 4 (5) ◽  
Author(s):  
NINA D. SINITSHENKOVA
Keyword(s):  
North America ◽  
Middle Triassic ◽  
Sister Group ◽  
Upper Permian ◽  
Early Permian ◽  
The Urals ◽  
The Family ◽  
Grès À Voltzia ◽  
Perm Region ◽  
Group Family

The mayfly sister group family Misthodotidae Tillyard, 1932 includes two genera: Misthodotes Sellards, 1909 and Triassodotes Sinitshenkova & Papier, 2005. Misthodotes species have so far been known only from the Permian, six Early Permian species have been described from North America (Carpenter, 1933, 1979; Tillyard, 1932, 1936), one from Germany (Kinzelbach & Lutz, 1984) and two from the Perm region of Russia (Tshernova, 1965). Only three species are known from the Upper Permian deposits: two from the famous Isady locality in the Vologda Region of Russia (Sinitshenkova, 2013; Sinitshenkova & Vassilenko, 2012) and one from the Urals (Novokshonov et al., 2002). The only Triassodotes species was found in the Middle Triassic Grès à Voltzia deposits in France (Sinitshenkova et al., 2005).

Geographical distribution and species diagnostics of the Carboniferous and Permian genus Gzheloceras (Cephalopoda: Nautiloidea)

2021 ◽  
pp. 267-273
Author(s):  
Vitaliy Dernov
Keyword(s):  
Geographical Distribution ◽  
Cross Section ◽  
Northern Hemisphere ◽  
Late Paleozoic ◽  
Early Permian ◽  
The Urals ◽  
Number Of Species ◽  
Centre Of Origin ◽  
Surface Ornamentation ◽  
North Western

The article is devoted to an attempt to trace the ways of distribution of Late Paleozoic nautilids Gzheloceras Ruzhencev et Shimansky, 1954. The genus Gzheloceras Ruzhencev et Shimansky (Cephalopoda: Nautiloidea) includes a large number of species from Carboniferous and Permian sediments. Representatives of the genus Gzheloceras were distributed mainly in the northern hemisphere. They inhabited the warm epicontinental seas of the northern and north-western periphery of the Palaeo-Tethys. Species of the genus Gzheloceras differ from each other by insignificant differences in the position of the siphuncle, the details of the surface ornamentation, less often in the form of suture and the shape of the cross section of the whorls. The form of the conch and a transverse ornamentation indicate a nectobenthic lifestyle of the genus Gzheloceras. The centre of origin of the genus is the waters on the place of modern Kazakhstan. In the Serpukhovian or Early Bashkirian, representatives of the genus Gzheloceras, apparently, dispersed into the Urals. The genus Gzheloceras flourished in the Early Permian of the Urals.

Potential foraminiferal markers for the Visean–Serpukhovian and Serpukhovian–Bashkirian boundaries—a case-study from Central Morocco

2011 ◽  
Vol 85 (6) ◽  
pp. 1105-1127 ◽  
Author(s):  
Pedro Cózar ◽  
Ismail Said ◽  
Ian D. Somerville ◽  
Daniel Vachard ◽  
Paula Medina-Varea ◽  
...  
Keyword(s):  
North America ◽  
Transform Fault ◽  
The Urals ◽  
Moscow Basin ◽  
Western European ◽  
Early Late

The Carboniferous succession in Adarouch (Central Morocco, north of the Atlas Transform Fault) contains thick carbonate beds including upper Visean, Serpukhovian and basal Bashkirian rocks. Foraminifers enable precise recognition of the Visean/Serpukhovian (V/S), early/late Serpukhovian (eS/lS) and Serpukhovian/Bashkirian (S/B) boundaries.Insolentitheca horrida, Loeblichia ukrainica, “Millerella”spp. andEndostaffella? sp. 2 are regarded as regionally useful indices to the V/S boundary, whereasEostaffellinaspp.,Eostaffella pseudostruveiand some evolved species ofArchaediscusexhibit greater reliability for worldwide correlation of this level. Similarly, the eS/lS boundary is marked locally byBrenckleina rugosa, Eosigmoilinasp., andMonotaxinoidesspp. and globally byLoeblichia minima, Bradyina cribrostomata, Plectostaffellaspp.,Eostaffellina “protvae”and“Turrispiroides”, and the S/B boundary is marked locally byGlobivalulina bulloidesand globally bySeminovella elegantula, andNovella?. Occurrences of these taxa in Morocco allow correlations with the Moscow Basin, the Urals, the Donetz Basin and North America. The Moroccan assemblages share few taxa in common with Saharan basins south of the Atlas Transform Fault. Correlations with western European basins are difficult because of the paucity in the latter of foraminiferal-bearing carbonate strata.

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