نتایج جستجو برای: alkali olivine basalt
تعداد نتایج: 22347 فیلتر نتایج به سال:
Pillow lavas are one of the important rock units of Nain ophiolite. Rock forming minerals of Nain ophiolite pillow lavas are chloritized olivine, plagioclase, clinopyroxene (augite), Cr-spinel, magnetite, amphibole, chlorite, pumpellyite, epidote, prehnite and calcite. Whole rock geochemical analyses and composition of clinopyroxenes and chromian spinels of these rocks indicate that they are si...
The Mars Science Laboratory (MSL) rover Curiosity has documented a section of fluvio-lacustrine strata at Yellowknife Bay (YKB), an embayment on the floor of Gale crater, approximately 500 m east of the Bradbury landing site. X-ray diffraction (XRD) data and evolved gas analysis (EGA) data from the CheMin and SAM instruments show that two powdered mudstone samples (named John Klein and Cumberla...
The widespread use of natural aggregates is one the main causes depletion resources, as are constituents several construction materials. Alternatively, it is, today, proven to be feasible mining tailings, either or recycled materials, produce artificial through specific processes. A possible way aggregate alkali activation powdered material in a process called geopolymerization. This study prop...
Textural, major element and trace element data for xeno-liths from Salt Lake Crater, Hawaii indicate that typical four phase lherzolite inclusions (olivine, orthopyroxene, chrome diopside and spinel) found worldwide in basalts are not samples of primitive upper mantle. Rather, lherzolite may be the recrystallized residue left after a basaltic melt extracts the easily fused components from pre-e...
Mantle xenoliths in basalt and tuffaceous volcanoes at the Shawran Crater, Bir Ali area, along southeastern coast of Yemen are very useful to elucidate nature lithospheric mantle beneath which is characterised by rift tectonic activity volcanism during Pliocene–Quaternary period. The studied mostly fresh showing igneous textures composed mainly spinel harzburgite lherzolite, addition to, less p...
Mid-infrared 2-D spectroscopic measurements from 8.0 to 12.7mm of Mercury were taken using Boston University’s Mid-Infrared Spectrometer and Imager (MIRSI) mounted on the NASA Infrared Telescope Facility (IRTF) on Mauna Kea, Hawaii, 7–11 April 2006. Measurements reported here cover radar bright region C, a dark plains region west of Caloris Basin, and the interior of Caloris Basin. By use of sp...
Introduction: Chondrules are believed to have formed by a brief but intense heating and melting event in the early solar system. Melting erased most mineralogical information about chondrules’ precursors. A sub-group of chondrules is rich in alkali elements and was classified as Naand Al-rich chondrules [1]. We describe two Na-rich chondrules and discuss their phase relations in order to disent...
Using THEMIS, MOC and MOLA data, we have found 120 craters in the diameter range 6 11.2 km that have unusually high depth/diameter (d/D) ratios (i.e., 0.0012) within southwestern Utopia Planitia and Isidis Planitia, Mars (Figure 1). Previous studies [1, 2, 3] noted a concentration of deep simple craters located mainly in SW Utopia Planitia suggesting that the deep simple craters could be caused...
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