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| OF AUD, RESEARCH GEOLOGICAL COUNCIL SCIENCES be MINERAL RESOURCES DIVISION NephelineSyenite and...nepheline-syenite contains too much iron for the rock to be utilised directly in its most important outlets,...capacity of the Arkansas granule plant is reported to be 100,000 tons. Nepheline-syenites do not bulk large...demands for all raw materials, alternative sources may be developed which are conveniently situated to centres...economic factors have to be satisfied before the development of a deposit can be contemplated. A first requirement |
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| 1st edition (1989), it shows how igneous rocks can be distinguished in the sequence of pyroclastic rocks...plutonic and volcanic rocks that remain can then be categorized using the familiar and widely accepted...the terms included in the glossary, this book will be an indispensable reference guide for all geologists...well-sorted pyroclastic rocks ............. 9 2.4 Terms to be used for mixed pyroclastic–epiclastic rocks .......was with a quantitative modal approach – what could be observed and quantified under the microscope. However |
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| in the definitions is included for those who may be unfamiliar with the language of petrology. Recent...I II II 3 9042 0 506061 For Reference Not to be taken from this room t 1*w^ *' r7- .•-^> <1...of this work covered by the copyrights hereon may be reproduced or used in any form or by any means—graphic...became clear that other materials should likewise be considered. Migmatites, tektites, impactites, and...lithographic limestone, and pellet limestone will be found under limestone (the root name). Furthermore |
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| Namuli Peaks, which had for long been considered to be of volcanic origin. This view he disproved (Last...Tertial T volcanic rocks of Mozambique, and will be followed by one describing the PreCambrian rocks...Pre-Cambrian age, and in a subsequent paper an attempt will be made to show that this view is justified : for a...method, proves that an approximate correlation can be made between the older rocks of :Mozambique and those...lxxii, The geological sequence in Mozaml~ique may be summarized as follows : - R e c e n t Deposits. |
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| for Students it was suggested that a replacement be provided on the same lines. The present book, in...increase rises rapidly until, finally, a glass may be formed. The marked increase in viscosity occurs in...the nucleus number. The facts outlined above may be applied most directly to the textures of lavas and...solidify as a glass. The resulting rock is said to be holohyaline. Siliceous magmas are particularly prone...Nevertheless, their former presence may frequently be proved, even after complete devitrification, by the |
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| „It is much better to recognize this situation and be on the lookout for new evidence than to accept any...greatly from other similar stone matter. In order to be able to discriminate correctly and minutely what...ingredients of granite, but their proportions will also be more or less constant, viz. about 25—30% quartz,...third, mineralogical composition and structure, must be put first. With regard to the first feature — the...is the resu lt1of some natural process; this can be taken for granted for every kind of rock. The fourth |
