Fossils and Garnets
نویسندگان
چکیده
منابع مشابه
Magnetic Properties of Y3−2xCa2xFe5−xVxO12 Garnets
A comprehensive study of the magnetic properties of Y3−2xCa2xFe5−xVxO12 (0 ≤ x ≤ 1) has been performed. The garnet ferrites samples were prepared by the ceramic technique, and X-ray diffraction analysis indicates the formation of single cubic phase. Vibrating sample magnetometry (VSM) and a superconducting quantum-interference device (SQUID) were used to measure the magnetic properties, especia...
متن کاملComparative Compressibilities of Majorite- Type Garnets
Relative compressibilities of five silicate garnets were determined by single-crystal x-ray diffraction on crystals grouped in the same high-pressure mount. The specimens include a natural pyrope [(Mgz.84Feo.IOCao,o6) AI2Si30d, and four synthetic specimens with octahedrally-coordinated silicon: majorite [Mg3(MgSi)Si30 d, calcium-bearing majorite [(Cao.49Mg2.sl)(MgSi)Si30d, sodium majorite [(NaI...
متن کاملFossils and plant phylogeny.
Developing a detailed estimate of plant phylogeny is the key first step toward a more sophisticated and particularized understanding of plant evolution. At many levels in the hierarchy of plant life, it will be impossible to develop an adequate understanding of plant phylogeny without taking into account the additional diversity provided by fossil plants. This is especially the case for relativ...
متن کاملGarnets from the Camafuca-Camazambo kimberlite (Angola).
This work presents a geochemical study of a set of garnets, selected by their colors, from the Camafuca-Camazambo kimberlite, located on northeast Angola. Mantle-derived garnets were classified according to the scheme proposed by Grütter et al. (2004) and belong to the G1, G4, G9 and G10 groups. Both sub-calcic (G10) and Ca-saturated (G9) garnets, typical, respectively, of harzburgites and lher...
متن کاملPerspectives from fossils and phylogenies
Over half of all described species are insects, but until recently our understanding of the reasons for this diversity was based on very little macroevolutionary evidence. Here I summarize the hypotheses that have been posed, tests of these hypotheses and their results, and hence identify gaps in knowledge for future researchers to pursue. I focus on inferences from the following sources: (i) t...
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ژورنال
عنوان ژورنال: Geological Magazine
سال: 1901
ISSN: 0016-7568,1469-5081
DOI: 10.1017/s0016756800179981