volcanic rocks of interest are situated in the middle part of the urumieh-dokhtar magmatic arc (udma). they are parts of a vast magmatic province located in the north of bitlis-zagros suture zone. having a prevailing porphyritic texture, these rocks include phenocrysts of plagioclase, amphibole and biotite in a matrix composed of feldspar, quartz, opaque, glass and microlite and mineralogically...

Abstract Several swarms of parallel E–W dikes cuts late Neoproterozoic- to early Paleozoic (540 Ma) basement in the Biarjmand area, NE Iran. The microgabbroic doleritic dike are several hundred meters long and 0.5 3 wide. U–Pb dating their zircon grains yields a crystallization age 46.0 ± 7.1 Ma for swarms. have SiO2 contents 46.0–49.3 wt%, Fe2O3 9.80–14.8 wt% with variable MgO (4.92–9.16 wt%),...

The tectono-magmatic history of the Lüchun-Jinping microblock and its possible affinity with Yangtze Craton are important elements for reconstruction Cenozoic plate tectonics in southeastern Tibet. In order to constrain decipher pre-Cenozoic paleopositon microblock, we focused on petrogenesis Eocene-Oligocene lamprophyres microblock. yield zircon UPb ages 34.7–33.3 Ma exhibit potassic-ultrapota...

summarythe explanation of the elastic, or velocity structure of the earth has long been a goal of the world’s seismologists. for the first few decades of seismological research, the investigation on velocity structure was restricted to the determination of one-dimensional models of the solid earth and of various regions within it. seismologists are currently obtaining three dimensional velocity...

The pyroclastic rocks of "The Crater", South Island, New Zealand belong to the Miocene, alkaline basaltic Dunedin Volcanic Group and represent an individual eruptive center with possible multiple vents. Three pyroclastic units have been separated at the study area based on textural and compositional features as well as their stratigraphic positions. The central part of The Crater comprises basa...

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,...

Roya Safari Faramani, Armita Shahesmaeili, Samira Hosseini Hooshyar, Razieh Khajehkazemi, Maryam Nasirian, Hamid Sharifi, Kianoosh Kamali. Modeling in Health Research Center, Institute for Futures Studies in Health, Kerman University of Medical Sciences, Kerman, Iran; HIV/STI Surveillance Research Center, and WHO Collaborating Center for HIV Surveillance, Institute for Futures Studies in Health...