scholarly journals Diatom Diversity in the Spring and Spring-fed River of Tizab Region (Central Alborz), Iran

2019 ◽  
Vol 3 (2) ◽  
pp. 408-420
Author(s):  
Somayyeh Kheiri
Keyword(s):  
Central Alborz

Timing of fluorite mineralization and exhumation events in the east Central Alborz Mountains, northern Iran: constraints from fluorite (U–Th)/He thermochronometry

2021 ◽  
pp. 1-17
Author(s):  
Behnam Shafiei Bafti ◽  
István Dunkl ◽  
Saeed Madanipour
Keyword(s):  
Thermal Relaxation ◽  
Geothermal Gradient ◽  
Source Rocks ◽  
Lower Amount ◽  
Mining District ◽  
Northern Iran ◽  
East Central ◽  
Central Alborz ◽  
Ore Mineralization ◽  
History Of

Abstract The recently developed fluorite (U–Th)/He thermochronology (FHe) technique was applied to date fluorite mineralization and elucidate the exhumation history of the Mazandaran Fluorspar Mining District (MFMD) located in the east Central Alborz Mountains, Iran. A total of 32 fluorite single-crystal samples from four Middle Triassic carbonate-hosted fluorite deposits were dated. The presented FHe ages range between c. 85 Ma (age of fluorite mineralization) and c. 20 Ma (erosional cooling during the exhumation of the Alborz Mountains). The Late Cretaceous FHe ages (i.e. 84.5 ± 3.6, 78.8 ± 4.4 and 72.3 ± 3.5 Ma) are interpreted as the age of mineralization and confirm an epigenetic origin for ore mineralization in the MFMD, likely a result of prolonged hydrothermal circulation of basinal brines through potential source rocks. Most FHe ages scatter around the Eocene Epoch (55.4 ± 3.9 to 33.1 ± 1.7 Ma), recording an important cooling event after heating by regional magmatism in an extensional tectonic regime. Cooling of the heated fluorites, as a result of thermal relaxation in response to geothermal gradient re-equilibration after the end of magmatism, or exhumation cooling during extensional tectonics characterized by lower amount of erosion are most probably the causes of the recorded Eocene FHe cooling ages. Oligocene–Miocene FHe ages (i.e. 27.6 ± 1.4 to 19.5 ± 1.1 Ma) are related to the accelerated uplift of the whole Alborz Mountains, possibly as a result of the initial collision between the Afro-Arabian and Eurasian plates further to the south.

Litter sizes of brown bears in the Central Alborz Protected Area, Iran

Ursus ◽  
2011 ◽  
Vol 22 (2) ◽  
pp. 167-171 ◽  
Author(s):  
Bagher Nezami ◽  
Mohammad S. Farhadinia
Keyword(s):  
Protected Area ◽  
Brown Bears ◽  
Central Alborz

Discovery of new open-air Paleolithic localities in Central Alborz, Northern Iran

2007 ◽  
Vol 52 (4) ◽  
pp. 380-387 ◽  
Author(s):  
G BERILLON ◽  
A ASGARIKHANEGHAH ◽  
P ANTOINE ◽  
J BAHAIN ◽  
B CHEVRIER ◽  
...  
Keyword(s):  
Northern Iran ◽  
Central Alborz

The Caspian Dialect of Kujūr in the Central Alborz

Iran ◽  
2013 ◽  
Vol 51 (1) ◽  
pp. 235-246 ◽  
Author(s):  
Habib Borjian
Keyword(s):  
Central Alborz

The Extinct Dialect of Tajrish: Caspian or Persian?

2011 ◽  
Vol 4 (2) ◽  
pp. 246-271 ◽  
Author(s):  
Habib Borjian
Keyword(s):  
Transition Zone ◽  
Central Alborz ◽  
Alborz Range ◽  
Administrative Center

Abstract Once spoken in the Alborz foothills north of Tehran, the vernacular of Shemirān and its administrative center Tajrish was greatly influenced by the Caspian languages spoken northward across the Alborz range, in its valleys and in the Caspian littoral. This study of Tajrishi draws on the texts collected by Valentin Zhukovskii in the 1880s as well as two recent documentations of smaller size. It reveals that Tajrishi and the adjoining vernaculars constitute the southernmost part of the Caspian-Persian linguistic transition zone in Central Alborz.

Temporal variations of seismicity parameters in the Central Alborz, Iran

2013 ◽  
Vol 62 (3) ◽  
pp. 486-504
Author(s):  
Maryam Agh-Atabai ◽  
Maryam S. Mirabedini
Keyword(s):  
Temporal Variations ◽  
Seismicity Parameters ◽  
Central Alborz
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