Обобщены новейшие данные в области синтеза ряда минералов в гидротермальных условиях, рас-плавными методами и при высоких давлениях. Приведены сведения по условиям выращивания, изучению строения и физических свойств кварца и некоторых его разновидностей, оптического кальцита, асбеста, цинкита, канкринита, циркона, иттриево-алюминиевых гранатов, фторфлогопита, муллита, алмаза и некоторых других минералов.
Для минералогов, геохимиков, кристаллографов, физиков, а также для всех других специалистов, занимающихся выращиванием и исследованием минералов, изучением процессов природного минерало-образования.
Central Mongolia is geologically characterized by close juxtaposition of an accreted oceanic terrane with an arc-microcontinent collision zone. We present new U–Pb zircon ages and geochemical data for the Bayankhongor ophiolite mélange from the oceanic terrane and for a syenite porphyry pluton from the arc-microcontinent zone, providing critical constraints on the regional evolution in late Neoproterozoic to early Cambrian times. An anorthosite (655±4 Ma) associated with layered gabbro, a rodingite (metasomatized layered gabbro) (647±6 Ma), and a high-level isotropic amphibole gabbro (647±7 Ma) yielded the oldest zircon ages for the plutonic part of the ophiolite. A plagiogranite dike in the amphibole gabbro yielded an age of 636±6 Ma, which is the youngest date obtained for the ophiolitic rocks. We suggest that the long duration (ca. 20 Ma) for formation of this plutonic sequence characterizes the sea-floor spreading evolution, and the Nd–Sr isotopic composition (εNd(t) = +7.6 to +4.7; initial 87Sr/86Sr ratio = 0.70279–0.70327) points to a mid-ocean-ridge origin. The syenite porphyry, dated at 523±2 Ma, records the terminal or post-collisional phase of orogeny. The Bayankhongor oceanic lithosphere experienced at least 92Ma of drift between its formation and accretion.
"Chapters ... prepared for presentation at a Short Course, sponsored by the Mineralogical Society of America (MSA) in Freiburg, Germany, April 3-4, 2003"--P. v Includes bibliographical references
