Late Oligocene to early Miocene humidity change recorded in terrestrial sequences in the Ili Basin (south-eastern Kazakhstan, Central Asia)

Sedimentology ◽  
2017 ◽  
Vol 65 (2) ◽  
pp. 517-539 ◽  
Author(s):  
Alexandra Hellwig ◽  
Silke Voigt ◽  
Andreas Mulch ◽  
Konstantin Frisch ◽  
Alexander Bartenstein ◽  
...  
Keyword(s):  
Central Asia ◽  
Early Miocene ◽  
Late Oligocene ◽  
South Eastern ◽  
Humidity Change ◽  
Eastern Kazakhstan

Early Miocene Carnivora of Aktau Mountains, South Eastern Kazakhstan

PalZ ◽  
2000 ◽  
Vol 74 (1-2) ◽  
pp. 195-204 ◽  
Author(s):  
Elena G. Kordikova ◽  
Elmar P. J. Heizmann ◽  
Alexander V. Mavrin
Keyword(s):  
Early Miocene ◽  
South Eastern ◽  
Eastern Kazakhstan

High conifer diversity in Oligo-Miocene New Zealand

2011 ◽  
Vol 24 (2) ◽  
pp. 121 ◽  
Author(s):  
Gregory J. Jordan ◽  
Raymond J. Carpenter ◽  
Jennifer M. Bannister ◽  
Daphne E. Lee ◽  
Dallas C. Mildenhall ◽  
...  
Keyword(s):  
New Species ◽  
New Zealand ◽  
North America ◽  
Early Miocene ◽  
Late Oligocene ◽  
Endemic Genus ◽  
South Eastern ◽  
Eastern Australia ◽  
Early Neogene ◽  
Multiple Species

Eight species of Podocarpaceae foliage are recognised from the late Oligocene or early Miocene Newvale site, South Island, New Zealand, and the following five new species are described: two of Dacrydium Lamb. and one each of Dacrycarpus (Endl.) de Laub., Phyllocladus Rich. ex Mirb. and Halocarpus Quinn. The latter is the first macrofossil record of this New Zealand endemic genus. All these conifers, plus Agathis Salisb., Microcachrys Hook.f. and Podocarpus Pers., co-occurred in the local vegetation at Newvale. In conjunction with prior records of macrofossils and pollen, these fossils indicate that the late Paleogene to early Neogene conifer flora of New Zealand was very diverse, with all but one of the extant genera present, together with several regionally or globally extinct genera, and multiple species of many of these genera. This fossil diversity is similar to the Paleogene fossil conifer diversity observed in south-eastern Australia (and particularly Tasmania) and in parts of North America.

scholarly journals Late Oligocene–early Miocene birth of the Taklimakan Desert

2015 ◽  
Vol 112 (25) ◽  
pp. 7662-7667 ◽  
Author(s):  
Hongbo Zheng ◽  
Xiaochun Wei ◽  
Ryuji Tada ◽  
Peter D. Clift ◽  
Bin Wang ◽  
...  
Keyword(s):  
Central Asia ◽  
Critical Region ◽  
Early Miocene ◽  
Taklimakan Desert ◽  
Late Oligocene ◽  
Volcanic Tuff ◽  
Sedimentary Sequences ◽  
Environmental Event ◽  
The Taklimakan Desert ◽  
Dust Sources

As the world’s second largest sand sea and one of the most important dust sources to the global aerosol system, the formation of the Taklimakan Desert marks a major environmental event in central Asia during the Cenozoic. Determining when and how the desert formed holds the key to better understanding the tectonic–climatic linkage in this critical region. However, the age of the Taklimakan remains controversial, with the dominant view being from ∼3.4 Ma to ∼7 Ma based on magnetostratigraphy of sedimentary sequences within and along the margins of the desert. In this study, we applied radioisotopic methods to precisely date a volcanic tuff preserved in the stratigraphy. We constrained the initial desertification to be late Oligocene to early Miocene, between ∼26.7 Ma and 22.6 Ma. We suggest that the Taklimakan Desert was formed as a response to a combination of widespread regional aridification and increased erosion in the surrounding mountain fronts, both of which are closely linked to the tectonic uplift of the Tibetan–Pamir Plateau and Tian Shan, which had reached a climatically sensitive threshold at this time.

Early miocene rodents from the Aktau Mountains (South-Eastern Kazakhstan)

2001 ◽  
Vol 81 (2) ◽  
pp. 391-405 ◽  
Author(s):  
Elena G. Kordikova ◽  
Hans de Bruijn
Keyword(s):  
Early Miocene ◽  
South Eastern ◽  
Eastern Kazakhstan

Lepidopteran species (Insecta: Lepidoptera) feeding on saxauls (Amaranthaceae) in desert areas of South-Eastern Kazakhstan

2016 ◽  
Vol VIII (19) ◽  
pp. 69-73
Author(s):  
Nagima Tumenbayeva ◽  
Bagdavlet Taranov ◽  
Dimitar Grekov ◽  
Vili Harizanova
Keyword(s):  
South Eastern ◽  
Lepidopteran Species ◽  
Desert Areas ◽  
Eastern Kazakhstan

NOTE ON TWO UMBELLIFERAE TAXA OF SOUTH-EASTERN KAZAKHSTAN, INVALIDLY PUBLISHED BY M. S. BAJTENOV, "БОТАНИЧЕСКИЙ ЖУРНАЛ"

2012 ◽  
pp. 650-658
Author(s):  
М.Г. ПИМЕНОВ ◽  
E.V. KLJUYKOV ◽  
G.V. DEGTJAREVA
Keyword(s):  
Rare Species ◽  
Monotypic Genus ◽  
Southern Limit ◽  
South Eastern ◽  
Middle Asia ◽  
New Material ◽  
Eastern Kazakhstan

New material on a rare species Silaum saxatilis (Umbelliferae) from southern limit of the Dzungarian Alatau (South-Eastern Kazakhstan) allowed to describe the structure of its fruits. The species is assigned to a distinct monotypic genus Tschulaktavia, the generic name was proposed by M. S. Bajtenov and validated here. Another speciens described by Bajtenov, Stenotaenia iliensis, is synonymized with Hyalolaena tshuiliensis. The genus Stenotaenia does not occus in Kazakhstan and the Middle Asia. 658

scholarly journals The Cenozoic Malaguide Basin from Sierra Espuña (Murcia, S Spain): An Example of Geological Heritage

Geosciences ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 34
Author(s):  
Santiago Moliner-Aznar ◽  
Manuel Martín-Martín ◽  
Tomás Rodríguez-Estrella ◽  
Gregorio Romero-Sánchez
Keyword(s):  
Middle Eocene ◽  
Geological Heritage ◽  
Passive Margin ◽  
Early Miocene ◽  
Late Oligocene ◽  
Deep Basin ◽  
Sedimentary Evolution ◽  
Early Oligocene ◽  
Upper Oligocene ◽  
Very High

The Cenozoic Malaguide Basin from Sierra Espuña (Internal Betic Zone, S Spain) due to the quality of outcropping, areal representation, and continuity in the sedimentation can be considered a key-basin. In the last 30 years, a large number of studies with very different methodological approaches have been done in the area. Models indicate an evolution from passive margin to wedge-top basin from Late Cretaceous to Early Miocene. Sedimentation changes from limestone platforms with scarce terrigenous inputs, during the Paleocene to Early Oligocene, to the deep basin with huge supplies of turbidite sandstones and conglomerates during the Late Oligocene to Early Miocene. The area now appears structured as an antiformal stack with evidence of synsedimentary tectonics. The Cenozoic tectono-sedimentary basin evolution is related to three phases: (1) flexural tectonics during most of the Paleogene times to create the basin; (2) fault and fold compartmentation of the basin with the creation of structural highs and subsiding areas related to blind-fault-propagation folds, deforming the basin from south to north during Late Oligocene to Early Aquitanian times; (3) thin-skin thrusting tectonics when the basin began to be eroded during the Late Aquitanian-Burdigalian. In recent times some works on the geological heritage of the area have been performed trying to diffuse different geological aspects of the sector to the general public. A review of the studies performed and the revisiting of the area allow proposing different key-outcrops to follow the tectono-sedimentary evolution of the Cenozoic basin from this area. Eight sites of geological interest have been selected (Cretaceous-Cenozoic boundary, Paleocene Mula Fm, Lower Eocene Espuña-Valdelaparra Fms, Middle Eocene Malvariche-Cánovas Fms, Lowermost Oligocene As Fm, Upper Oligocene-Lower Aquitanian Bosque Fm, Upper Oligocene-Aquitanian Río Pliego Fm, Burdigalian El Niño Fm) and an evaluation has been performed to obtain four parameters: the scientific value, the educational and touristic potential, and the degradation risk. The firsts three parameters obtained values above 50 being considered of “high” or “very high” interest (“very high” in most of the cases). The last parameter shows always values below 50 indicating a “moderate” or “low” risk of degradation. The obtained values allow us considering the tectono-sedimentary evolution of this basin worthy of being proposed as a geological heritage.

scholarly journals Late oligocene–early miocene shortening in the Thrace Basin, northern Aegean

2021 ◽  
Author(s):  
Ümitcan Erbil ◽  
Aral I. Okay ◽  
Aynur Hakyemez
Keyword(s):  
Large Scale ◽  
Middle Eocene ◽  
Early Miocene ◽  
Fold Axis ◽  
Late Oligocene ◽  
The Balkans ◽  
Sedimentary Sequences ◽  
The North ◽  
Early Oligocene ◽  
Thrace Basin

AbstractLate Cenozoic was a period of large-scale extension in the Aegean. The extension is mainly recorded in the metamorphic core complexes with little data from the sedimentary sequences. The exception is the Thrace Basin in the northern Aegean, which has a continuous record of Middle Eocene to Oligocene marine sedimentation. In the Thrace Basin, the Late Oligocene–Early Miocene was characterized by north-northwest (N25°W) shortening leading to the termination of sedimentation and formation of large-scale folds. We studied the stratigraphy and structure of one of these folds, the Korudağ anticline. The Korudağ anticline has formed in the uppermost Eocene–Lower Oligocene siliciclastic turbidites with Early Oligocene (31.6 Ma zircon U–Pb age) acidic tuff beds. The turbidites are underlain by a thin sequence of Upper Eocene pelagic limestone. The Korudağ anticline is an east-northeast (N65°E) trending fault-propagation fold, 9 km wide and 22 km long and with a subhorizontal fold axis. It is asymmetric with shallowly-dipping northern and steeply-dipping southern limbs. Its geometry indicates about 1 km of shortening in a N25°W direction. The folded strata are unconformably overlain by Middle Miocene continental sandstones, which constrain the age of folding. The Korudağ anticline and other large folds in the Thrace Basin predate the inception of the North Anatolian Fault (NAF) by at least 12 myr. The Late Oligocene–Early Miocene (28–17 Ma) shortening in the Thrace Basin and elsewhere in the Balkans forms an interlude between two extensional periods, and is probably linked to changes in the subduction dynamics along the Hellenic trench.

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