Results 181 to 190 of about 844 (216)
Terra Nova, EarlyView.ABSTRACT The long‐term evolution of orogenic drainage systems is closely related to the propagation of tectonic structures, which gives rise to the topography and hence anisotropies for river incision. This study focuses on the subalpine Vercors Massif (SW French Alps), reconstructing the geometry of an uplifted paleo‐canyon and applying calcite U–Pb ...
Vivien Mai Yung Sen +6 more
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Hydrous Asthenosphere Underneath the Northern Pannonian Basin
Terra Nova, EarlyView.ABSTRACT This study reveals the structural hydroxyl content in clinopyroxenes of three cumulate xenoliths from the Nógrád‐Gömör/Novohrad‐Gemer Volcanic Field (northern Pannonian Basin), with values ranging from 275 to 384 ppm. Based on these data, the water content of the equilibrium parental alkali basaltic melt was estimated to be between 1.5 and 2.1
Levente Patkó +6 more
wiley +1 more source
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2003
Publisher Summary The classification of igneous rock bodies in terms of their form and structural relationship to adjacent rocks is discussed in this chapter. These aspects are the most relevant to the appearance of igneous rocks on geological maps. Igneous rocks are formed by the solidification of molten rock or magma.
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Publisher Summary The classification of igneous rock bodies in terms of their form and structural relationship to adjacent rocks is discussed in this chapter. These aspects are the most relevant to the appearance of igneous rocks on geological maps. Igneous rocks are formed by the solidification of molten rock or magma.
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2014
Study of igneous petrology is a basic necessity to geological sciences. Igneous rocks—intrusive (plutonic) and extrusive (volcanic)—are natural products of crystallization, cooling and solidification of magma originated from the deepest parts of the Earth and represent the original source for sedimentary and metamorphic counter components.
S.K. Haldar, Josip Tišljar
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Study of igneous petrology is a basic necessity to geological sciences. Igneous rocks—intrusive (plutonic) and extrusive (volcanic)—are natural products of crystallization, cooling and solidification of magma originated from the deepest parts of the Earth and represent the original source for sedimentary and metamorphic counter components.
S.K. Haldar, Josip Tišljar
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Geological Society of America Bulletin, 1953
The old value of 0.048 per cent chlorine for the average in the earth9s crust is considered too high, and an average of 0.02 per cent appears more probable. The average chlorine content of approximately 100 granitic rocks from North America and other parts of the world was found to be 0.022 per cent; of 20 gabbros, 0.021 per cent; and of 40 basalts and
E. B Sandell, P. K Kuroda
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The old value of 0.048 per cent chlorine for the average in the earth9s crust is considered too high, and an average of 0.02 per cent appears more probable. The average chlorine content of approximately 100 granitic rocks from North America and other parts of the world was found to be 0.022 per cent; of 20 gabbros, 0.021 per cent; and of 40 basalts and
E. B Sandell, P. K Kuroda
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Geological Magazine, 1932
THE leading problems presented by igneous rocks are:—(a) the nature and sources of the primary magmas;(b) the mechanics of magmatic intrusion and emplacement; and(c) the processes which have brought about the manifold diversity of igneous rock-types.
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THE leading problems presented by igneous rocks are:—(a) the nature and sources of the primary magmas;(b) the mechanics of magmatic intrusion and emplacement; and(c) the processes which have brought about the manifold diversity of igneous rock-types.
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1994
Feldspars are the most abundant minerals in almost all crustal igneous rocks, those without feldspars being rarities. Feldspars define better than any other mineral group the three stages in the evolution of igneous rocks, the magmatic growth, the subsolidus transformation and the deuteric alteration stages.
William L. Brown, Ian Parsons
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Feldspars are the most abundant minerals in almost all crustal igneous rocks, those without feldspars being rarities. Feldspars define better than any other mineral group the three stages in the evolution of igneous rocks, the magmatic growth, the subsolidus transformation and the deuteric alteration stages.
William L. Brown, Ian Parsons
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Petrology of the igneous rocks
Reviews of Geophysics, 1987During the period 1983 to 1986, the large number of papers, books, and monographs published on the petrology and geochemistry of igneous rocks reflects the vitality and continued growth of this central earth science discipline. While an attempt has been made to prepare a reasonably complete bibliography, the accompanying text, of necessity, reflects a ...
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Aqueously altered igneous rocks sampled on the floor of Jezero crater, Mars
Science, 2022Lisa E Mayhew +2 more
exaly