Download Secrets of the Sands: The Revelations of Egypt by Harry Thurston PDF

By Harry Thurston

In part of Egypt so parched that many years may well move among rainstorms, amid a sea of sand, is a eco-friendly island—Dakhleh, the “everlasting oasis”—that may perhaps comprise the total of human historical past. during this impressive publication, an acclaimed technology author and journalist follows a world staff of archaeologists as they unencumber the secrets and techniques of approximately part 1000000 years. utilizing high-tech equipment, those scientists have made beautiful unearths, together with symptoms that Dakhleh can have been the cradle of the Nile civilization that gave upward thrust to the pharaohs and the pyramids.

They have unearthed an ideal previous country city, with palaces and temples from the Golden Age, large caches of mummies and papyri, and the world's oldest books, and feature positioned a complete Roman city—a Pompeii in the midst of the wilderness. mixing parts of experience narrative, travelogue, and medical secret, Secrets of the Sands additionally strains on a grand ancient scale the tale of ways people have interacted with the altering setting, laying naked a parable with relevance to us all concerning the fragile stability among humankind and our global.

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Thus the leucocratic rocks of the ophiolites differ distinctly from continental granophyres on the basis of their normative feldspar contents. Differentiation trends that give rise to the oceanic plagiogranites can be illustrated by the triangular AFM diagram (Fig. 18). By using the average subalkaline oceanic basalt (Troodos) as the starting liquid, it is evident that the ophiolite leucocratii:: rocks follow the tholeiite (Thingmuli) differentiation trend rather than a calc-alkaline trend. Perhaps the most important chemical characteristic of the ophiolite sequence is the extremely low potassium content.

In nearly all occurrences of ophiolites, harzburgite is the dominant rock type; however, in some instances, dunite may be predominant (see for instance, Ragan, 1963; Challis, 1965). The harzburgites generally have a xenoblastic granular texture and consist of olivine, orthopyroxene, and chromian spinel. The grain size is quite variable as many of these rocks show recrystallization textures and it is difficult to establish original grain boundaries. Orthopyroxene grains average 2-4 mm and many contain clinopyroxene exsolution lamellae.

4 Chemistry The cumulate rocks of ophiolite complexes show a wide range in composition and for the purposes of this discussion, are divided into two main groups: (1) ultramafic cumulates; (2) mafic cumulates (Table 4). The ultramafic cumulates are most commonly found in the Part III. Igneous Petrology 42 Table 4. 72 Norms calculated on conversion of all Fe 2 0 3 to FeO, deletion of H 2 0 and COz and normalizing (1) Troctolite, Semail ophiolite, Oman, Glennie et al. 7. (2) Troctolite, Masirah Island, Oman, Glennie et al.

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