The November 14 to December 25, 1979 Ghaenat earthquakes of northeast Iran and their tectonic implications

1980 ◽  
Vol 70 (5) ◽  
pp. 1751-1757
Author(s):  
A. Haghipour ◽  
M. Amidi
Keyword(s):  
Central Iran ◽  
Fault Rupture ◽  
Quaternary Deposits ◽  
Iranian Plateau ◽  
East Central ◽  
Lut Block ◽  
Shallow Earthquakes ◽  
Recent Earthquakes ◽  
Seismic Area ◽  
Northeast Iran

abstract A series of shallow earthquakes occurred in northeast Iran starting on November 14, 1979. The sequence includes two destructive earthquakes which occurred on November 14 and 27. In both cases, ground rupture developed along capable faults through the bedrock and Quaternary deposits. The November 14 earthquake was associated with a 20-km N-S trending right-lateral faulting. The November 27 earthquake accompanied a 60-km E-W trending left-lateral fault rupture. Also, during the second earthquake, the northern end of the earlier rupture continued northeastward to align with the eastern end of the second rupture. The result of the fault displacements of both earthquakes is relative subsidence with northeastward/eastward motion of the southwestern block. The earthquakes are located in the northeast corner of the Lut Block (an eastern fragment of central Iran) and included in the main structural zone of the Central Domain extended from Iran to Central Asia. The recent earthquakes are located in the highly seismic area of northeast Iran where the rate of seismicity has increased markedly in the past decade. Based on structural considerations of earthquake data, the rupture types their recent migration of locations show that a recent relative eastward motion for east-central Iran blocks resulted from northeast compressional movements and shortening of the Iranian Plateau.

Norian to Rhaetian scleractinian corals in the Ferdows Patch Reef (Nayband Formation, east central Iran)

2012 ◽  
Vol 86 (5) ◽  
pp. 801-812 ◽  
Author(s):  
Hannah M. E. Shepherd ◽  
George D. Stanley ◽  
Fatemeh Amirhassankhani
Keyword(s):  
Patch Reef ◽  
Scleractinian Corals ◽  
Central Iran ◽  
East Central ◽  
Patch Reefs ◽  
Faunal Assemblages ◽  
New Information ◽  
Nayband Formation ◽  
The Subject ◽  
Northeast Iran

The Nayband Formation is one of the best known sedimentary units in central Iran. The type section consists of a thick succession of shale, siltstone, reef limestone and sandstone that is subdivided into five distinct members: Gelkan, Bidestan, Hoz-e-Sheykh, Howz-e- Khan and Qadir. Abundant and well-preserved framework-building scleractinian corals are included among the macrofossils of the Nayband Formation; these corals characterize the formation and are the subject of this study. The Hassan-Abad section, located in northeast Iran in Lute Block (northwest of Ferdows city), was chosen for detailed study and sampling. Analysis of sedimentary lithofacies and faunal assemblages in the Bidestan and the Howz-e-khan members indicate both biostromal and biohermal characters for the former shallow-water patch reefs and support a Norian to Rhaetian age. The useful biostratigraphic hydrozoanHeterastridium conglobatumwas studied along with 14 taxa of scleractinian corals:Stylophyllopsis rudis, Distichophyllia norica, Paradistichophyllum dichotomum, Retiophyllia frechi, Retiophyllia norica, Retiophyllia robusta, Chondrocoenia schafhaeutli, Chondrocoenia ohmanni, Astraeomorpha crassisepta, Astraeomorpha confusa, Astraeomorpha minor, Procyclolites triadicus, Pamiroseris rectilamellosa,andEocomoseris ramosa. These fossils clarify the stratigraphy of the Nayband Formation, as well as provide new information on the patch reefs and the framework constructors of these reefs.

scholarly journals Crustal density structure of the northwestern Iranian Plateau

2019 ◽  
Vol 56 (12) ◽  
pp. 1347-1365 ◽  
Author(s):  
Vahid Teknik ◽  
Abdolreza Ghods ◽  
Hans Thybo ◽  
Irina M. Artemieva
Keyword(s):  
High Density ◽  
Central Iran ◽  
P Wave ◽  
Arabian Plate ◽  
Scale Model ◽  
Moho Depth ◽  
Caspian Basin ◽  
The South ◽  
South Caspian Basin ◽  
Iranian Plateau

We present a new 2D crustal-scale model of the northwestern Iranian plateau based on gravity–magnetic modeling along the 500 km long China–Iran Geological and Geophysical Survey in the Iranian plateau (CIGSIP) seismic profile across major tectonic provinces of Iran from the Arabian plate into the South Caspian Basin (SCB). The seismic P-wave receiver function (RF) model along the profile is used to constrain major crustal boundaries in the density model. Our 2D crustal model shows significant variation in the sedimentary thickness, Moho depth, and the depth and extent of intra-crustal interfaces. The Main Recent Fault (MRF) between the Arabian crust and the overriding central Iran crust dips at approximately 13° towards the northeast to a depth of about 40 km. The geometry of the MRF suggests about 150 km of underthrusting of the Arabian plate beneath central Iran. Our results indicate the presence of a high-density lower crustal layer beneath Zagros. We identify a new crustal-scale suture beneath the Tarom valley between the South Caspian Basin crust and Central Iran and the Alborz. This suture is associated with sharp variation in Moho depth, topography, and magnetic anomalies, and is underlain by a 20 km thick high-density crustal root at 35–55 km depth. The high-density lower crust in Alborz and Zagros may be related to partial eclogitization of crustal roots below about 40 km depth. The gravity and magnetic models indicate a highly extended continental crust for the SCB crust along the profile. Low observed magnetic susceptibility of the Kermanshah ophiolites likely indicates that the ophiolite rocks only form a thin layer that has been thrust over the sedimentary cover.

Facies analysis of a large-scale Jurassic shelf-lagoon: the Kamar-e-Mehdi Formation of east-central Iran

Facies ◽  
2009 ◽  
Vol 56 (1) ◽  
pp. 59-87 ◽  
Author(s):  
Markus Wilmsen ◽  
Franz T. Fürsich ◽  
Kazem Seyed-Emami ◽  
Mahmoud R. Majidifard ◽  
Massoud Zamani-Pedram
Keyword(s):  
Large Scale ◽  
Facies Analysis ◽  
Central Iran ◽  
East Central

scholarly journals Tectonic setting and geochronology of the Cadomian (Ediacaran-Cambrian) magmatism in Central Iran, Kuh-e-Sarhangi region (NW Lut Block)

2015 ◽  
Vol 102 ◽  
pp. 24-44 ◽  
Author(s):  
Federico Rossetti ◽  
Reza Nozaem ◽  
Federico Lucci ◽  
Gianluca Vignaroli ◽  
Axel Gerdes ◽  
...  
Keyword(s):  
Tectonic Setting ◽  
Central Iran ◽  
Lut Block

Ordovician echinoderms from the Tabas and Damghan regions, Iran: palaeobiogeographical implications

2005 ◽  
Vol 176 (3) ◽  
pp. 231-242 ◽  
Author(s):  
Bertrand Lefebvre ◽  
Mansooreh Ghobadipour ◽  
Elise Nardin
Keyword(s):  
South China ◽  
Central Iran ◽  
East Central ◽  
First Report ◽  
Middle Ordovician ◽  
Alborz Range ◽  
First Time

Abstract Two echinoderm assemblages are described in the Middle Ordovician of Iran (Darriwilian). The Simeh Kuh section (Damghan area, eastern Alborz range) has yielded a rich and diverse blastozoan fauna consisting of fistuliporite (Echinosphaerites, Heliocrinites) and dichoporite rhombiferans (cheirocrinids indet., hemicosmitids indet.), as well as aristocystitid (Sinocystis) and sphaeronitid diploporites (Glyptosphaerites, Tholocystis). Heliocrinites, cheirocrinids, hemicosmitids, Glyptosphaerites, and Tholocystis are reported for the first time in the Ordovician of Iran. A less diverse assemblage was collected in the Shirgesht section (Tabas area, Derenjal Mountains), and represents the first report of Ordovician echinoderms in east-central Iran. The Shirgesht fauna includes fistuliporite rhombiferans (Heliocrinites), aristocystitid and sphaeronitid diploporites. The new Iranian material documents some of the earliest known assemblages of diploporites and rhombiferans, and thus, brings important information on the radiation of these two major blastozoan classes. The two Iranian echinoderm faunas show relatively strong affinities with contemporary faunas from Baltica, the northern Gondwanan margin (e.g. Bohemia, Morocco), Sibumasu, and South China terranes. Aristocystitids suggest stronger links between Iran, and regions from the “Province à Amphorides” (northern Gondwanan margin, Sibumasu, South China). These observations support a palaeogeographical position of Iran at intermediate palaeolatitudes during the early Middle Ordovician, in the periphery of the northeastern Gondwanan margin.

Uranium–lead ages of apatite from iron oxide ores of the Bafq District, East-Central Iran

2010 ◽  
Vol 46 (1) ◽  
pp. 9-21 ◽  
Author(s):  
Heinz-Günter Stosch ◽  
Rolf L. Romer ◽  
Farahnaz Daliran ◽  
Dieter Rhede
Keyword(s):  
Iron Oxide ◽  
Central Iran ◽  
East Central
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