برنامه های همایش

 | تاریخ ارسال: 1399/2/2 | 
October ۲۰-۲۱: Conference
October ۲۲-۲۳: First Excursion at the Iranian Loess Plateau & Caspian Sea lowlands.
October ۲۴-۲۵: Second Excursion at the Southern Alborz Mountains & Central Iranian Plateau.
  • uary ۱۵: Early registration opens, call for the abstracts.
May ۳۰: End of the abstract submission.(extended)
June ۱۵: Early-bird registration closed.(extended)
July ۱۵: Acceptance of abstracts.(extended)

Excursions 


During excursion, the Caspian Lowlands, the Iranian Loess Plateau, the Alborz Mountains and the northernmost part of the Central Plateau will be visited .
Figure ۱: Google earth view of the excursion sites 
Excursion ۱: Caspian lowlands and Iranian Loess Plateau 
In Northern Iran, extensive loess deposits resembling “typical glacial loess” occur on the northern footslopes of Alborz Mountains between the cities of Sari and Minoodasht and in the so called Iranian Loess Plateau (Figure ۲) northeast of Gonbad-e Kavoos (Lateef ۱۹۸۸, Kehl et al. ۲۰۰۵, Frechen et al. ۲۰۰۹, Vlaminck et al. ۲۰۱۶). During the last years, several loess-soil sequences located on the northern foothills of Alborz Mountains and within the ILP have been studied. Unweathered (primary) loesses in Northern Iran show a typical loess texture, dominated by high silt contents of up to ۸۸ % and a median grain size ranging from ۸ at the section at Neka to ۳۴ μm in Agh Band . In the studied sections (Now Deh and Neka) in ILP luminescence age study of the upper most loess layers age back to ۶۰ ka, suggesting that the uppermost loess layers accumulated during the last glacial (Kehl et al. ۲۰۰۵ and Frechen et al. ۲۰۰۹). The palaeosol horizons age are related to the last interglacial and the parental loess to OIS ۶ (Frechen et al. ۲۰۰۹). In the City of Gorgan and its surroundings, several former brickery pits and road cuts expose loess deposits, more than ۳۰ m thick, which cover the northern foothills of Alborz Mountains to the west and east of the city. Sadabad section in Gorgan will provide an access to these loess deposits and intercalated palaeosols. 
Beside thick loess-palaeosol sequences several isolated linear dunes and barchans are developed between the south of Atrak River and the north of Gorgan River, on the flat lowland which spread between the Caspian Sea (West), Kopet Dagh and Alborz Mountains (East and South) and Karakum desert (North). The dunes strike WNW-ESE and attain maximum heights of ۱۵ m to ۳۰ m above the surface of the plain (Kehl et al. ۲۰۱۷). Sand dunes especially in eastern Caspian lowlands, Incheh-broun, provide valuable information in terms of palaeoclimate conditions and Caspian Sea level changes. Sand dunes accumulation in the area is happened ۱۰.۶ to ۸.۴ ka. Mostly of those are parabolic type and reflecting arid to semi-arid palaeoenvironmental conditions with sparse vegetation and predominance of easterly winds at the time of dune formation. The spatial and temporal distribution pattern of the studied dunes reflects a quick regression of the Caspian Sea during the Early Holocene, probably following the so-called Mangyshlak regression (Rahmizadeh et al. ۲۰۱۹)
There are ۲۳ mud volcanos in Golestan province, among them Gharenyaregh, Neftlijeh, Sofikam and Inche mud volcanoes in Gorgan Plain (SE Caspian Basin) are active and erupting mud and gas. Gharenyaregh mud volcano (GMV), with the largest crater (۵۰۰ m), has been generated from the Kopeh Dagh part of the deeper Gorgan Plain (Omrani and Raghimi ۲۰۱۸). 
 

Excursion ۲: Alborz Mountains and Central Plateau
During the excursion  Badab-e Surt colorful spring in Sari, Cheshmeh Ali spring as a part of Damghan fault (length ۱۰۰ km) close to Teppe Hesar site (۴۰۰۰ BC) and Haj Aligoli desert (Figure ۳) combination of Sand dunes, Nebkha deposits and salt playa, will be visited. 
 
Badab-e Surt spring 
Badab-e Surt spring (BSs) lying at about ۱,۸۴۱ m asl in Alborz Mountain ranges is located in Northern Iran (Mazandaran province), ۱۰۰km of Southern Sari city and east of Orost village, it is recognized as a World Heritage Site.  A few other places in the world resemble it, including the Pamukkale in Denizli in southwestern Turkey, Mammoth Hot Springs in the USA, and Huanglong in Sichuan Province of China (Sotohian and Ranjbaran ۲۰۱۵). Geologically the spring comes from Shemshak Formation a thick sequence of siliciclastic sediments and coal-bearing deposits. 

BSs (Figure ۴) is including two springs, one with the saline and the other spring water has a sour taste and orange color. They formed during Pleistocene and Pliocene, by the time the discharged cool bicarbonate-rich waters  from these springs has resulted in the formation of red, orange and yellow travertine terraces with crystalline crust, pisoid, tufa, and carbonate black muds lithofacies (Sotohian and Ranjbaran ۲۰۱۵).
Figure ۴. Badab-e Surt Spring
 
Haj Aligoli desert
Haj Aligoli /Chah-e-jam/Damgan desert is located at about ۱۰۵۰-۱۰۹۴ m asl in the southern Alborz Mountains close to dry plains of Iran central plateau and southeast of Damgan city (Semnan province). The desert area is ۲۳۹۱ sq.km; average temperature during summer season (JJ) is ۴۸ ⁰C and -۵ ⁰C in winter (JF) (Vahdati Nasab and Hashemi ۲۰۱۶). Damgan desert is a sedimentary-structural phenomenon (Ahmadi ۱۹۹۹). Due to poor vegetation, negative effective precipitation and wind activity desert landforms Nebkah, Barkhan, Seif and Sand dunes are dominant in the area (Vali and Musavi ۲۰۱۰). 
Based on sedimentology Damgan desert can be divided into three parts. The first part, which comprises ۴۷% of the desert, is the flat plate of clayey sediments, the second part is the wet or swampy area, which covers an area of about ۳۴% of the surface of the desert and finally the remained central part is a salt desert (Figure ۵) (Krinsley ۱۹۷۰). 

Discovered Upper/Epipaleolithic periods settlement evidences in the area indicating that climate during the late Pleistocene was different from than present (Vahdati Nasab and Hashemi ۲۰۱۶). 
Figure ۵: Damgan Salt Playa
Cheshmeh Ali spring
The biggest karstic spring in Semnan province called Cheshme-Ali (CAs)(Figure ۶) is located at ۳۰ km of NW Damghan and is one of Damgan desert catchments. CAs water discharge is ۵۰۰-۷۰۰ l/s and which provides drinking water for part of Semnan city and ۲۵ nearby villages. Average annual precipitation of the CAs watershed is ۱۵۵ whereas the number for the evaporation is ۱۹۰۰ mm. Geologically CAs is a part of eastern Alborz zone which is combination of the thick Delichae and thin Lar calcareous formations (Hosseini  et al. ۲۰۱۸).

                  

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  • مهلت ارسال مقاله : 15 اسفند
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