نتایج جستجو برای: central eurasia biquarterly
تعداد نتایج: 472643 فیلتر نتایج به سال:
The article represents the review of methods and classifications that were used in studies arid Eurasia biomes over time. All levels vegetation dynamics (seasonal, yearly, long-term, evolutionary) considered with peculiarities are characteristic for study region. In spite long history scientific researches deserts, Central Asia needs more based on modern data collecting processing.
Polyploid formation is a major mode of sympatric speciation in flowering plants. Unlike other speciation processes, polyploidization is often assumed to confer instant reproductive isolation. Shared polymorphism across ploidy levels has therefore often been attributed to multiple polyploid origins, whereas the alternative hypothesis of introgressive hybridization has rarely been rigorously test...
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,...
[1] Reconstructions of the relative positions of the India and Eurasia plates, using recently revised histories of movement between India and Somalia and between North America and Eurasia and of the opening of the East African Rift, show that India’s convergence rate with Eurasia slowed by more than 40% between 20 and 10 Ma. Much evidence suggests that beginning in that interval, the Tibetan Pl...
Magnetic and gravimetric data from the central Alboran Sea allow identification of two axes of crustal thinning, which were probably active during the Oligocene—Early Miocene. The western Alboran basin axis is subparallel and may be related in origin to the Gibraltar Arc. The ENE—WSW trending Alboran Channel axis is probably intruded by basic igneous rocks and may represent the western end of t...
Seismic data from central Tibet have been combined to image the subsurface structure and understand the evolution of the collision of India and Eurasia. The 410- and 660-kilometer mantle discontinuities are sharply defined, implying a lack of a subducting slab beneath the plateau. The discontinuities appear slightly deeper beneath northern Tibet, implying that the average temperature of the man...
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