نتایج جستجو برای: sahneh ophiolites
تعداد نتایج: 388 فیلتر نتایج به سال:
The ophiolitic complex of Sahneh-Harsin is composed of rock units such as gabbro, basalt, diabasic dikes, diorite and plagiogranite. The geochemical studies show that primitive magma has been sub-alkaline tholeiitic Mg-rich and K-poor. These data show enrichment of light rare earth elements (LREE) and depletion of heavy rare earth (HREE). The ratio of NbTa in the basalts is between 16.19 and 18...
The study area known as ‘Chahar-Dahaneh’ is part of the Iranian southeast ophiolites related to Alpian-Himalayan Mesozoic orogeny belt, and is located in the western margin of the Makran subduction zone. Chahar Dahaneh peridotite section consists of three major lithologies including: 1.dunite lenses 2. harzburgites and 3. Lherzolite. Based on electron microprobe analysis ,we estimated pressure ...
Before its collision with Eurasia1–5, the Indian Plate moved rapidly, at rates exceeding 140mmyr−1 for a period of 20 million years1,3–7. This motion is 50 to 100% faster than the maximum sustained rate of convergence of themain tectonic plates today8. The cause of such high rates of convergence is unclear and not reproduced by numerical models9,10. Here we show that existing geological data11,...
New structural data have been collected in the high-pressure meta-ophiolites exposed Lanzo Valleys (i.e., Ophiolite, LVO) and tectonically overlying continental crust of Dora-Maira Gran Paradiso massifs Western Alps. Detailed geological mapping analysis carried out south-western sector LVO Upper Viù Valley) allow to distinguish four ductile deformation phases, corresponding subduction-related D...
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