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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Author: Paul G. Spry
Publisher: VSP
ISBN: 9789067641265
Category : Science
Languages : en
Pages : 266
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Book Description
The unifying theme to the papers in this volume is that they deal with economic accumulations of sulfide minerals which, together with their host rocks, have been affected to varying degrees by regional metamorphism. The principle sulfide deposit types discussed are stratabound ZnCuPbAgBa deposits in regionally metamorphosed terranes which occur in a diverse variety of host lithologies. In addition other interesting deposit types are discussed and examples are presented from various parts of the world. The topics treated in this volume are: the interaction of sulfide minerals with their host rocks during regional metamorphism; the quantitative interpretation of P-T-time histories of regional metamorphism in which both sulfide and silicate phase relations must be considered together in order to meaningfully interpret the metamorphic history; the question of how to identify progenitors of rocks modified by tectonic and metamorphic processes and the implications of these studies; developing future exploration strategies for massive sulfide deposits in meatmorphic terranes.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 72
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Author: Kurt Bucher
Publisher: Springer Science & Business Media
ISBN: 3662030004
Category : Science
Languages : en
Pages : 298
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Metamorphic rocks are one of the three classes of rocks. Seen on a global scale they constitute the dominant material of the Earth. The understanding of the petrogenesis and significance of metamorphic of geological education. rocks is, therefore, a fundamental topic There are, of course, many different possible ways to lecture on this theme. This book addresses rock metamorphism from a relatively pragmatic view point. It has been written for the senior undergrad uate or graduate student who needs practical knowledge of how to interpret various groups of minerals found in metamorphic rocks. The book is also of interest for the non-specialist and non-petrolo gist professional who is interested in learning more about the geolo gical messages that metamorphic mineral assemblages are sending, as well as pressure and temperature conditions of formation. The book is organized into two parts. The first part introduces the different types of metamorphism, defines some names, terms and graphs used to describe metamorphic rocks, and discusses principal aspects of metamorphic processes. Part I introduces the causes of metamorphism on various scales in time and space, and some principles of chemical reactions in rocks that accompany metamorphism, but without treating these principles in detail, and presenting the thermodynamic basis for quantitative analysis of reactions and their equilibria in metamorphism. Part I also presents concepts of metamorphic grade or intensity of metamorphism, such as the metamorphic-facies concept.
Author: Graham Landers Kelsey
Publisher:
ISBN:
Category : Metamorphic rocks
Languages : en
Pages : 156
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Author: C. Tucker Barrie
Publisher:
ISBN:
Category : Ore deposits
Languages : en
Pages : 430
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Author: Eva Zaleski
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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The complex structure and mineralogy of the Linda volcanogenic massive sulphide deposit are the result of polyphase dynamometamorphism superimposed on primary sulphide mineralization and associated hydrothermal alteration. Outcrop mapping and drill-core logging elucidated the 3-dimensional configuration of the deposit. Microstructural and paragenetic relationships, mineral chemistry, and wholerock geochemistry constrain its petrogenesis and its significance to the structural and metamorphic history of the Snow Lake region. At the Linda deposit, two discrete zones of Fe-Mg alteration occur in felsic rocks of the stratigraphic footwall. The proximal alteration zone consists mainly of stratabound and stratiform mineralization resulting from the accumulation of chemical sediments in a topographic depression on the down-thrown side of a synvolcanic fault. The distal alteration zone is hosted bv felsic volcanic rocks lower in the stratigraphic sequence and may represent subsurface alteration. The Linda deposit lies in highly strained overturned rocks on one flank of the Anderson Bay structure, which marks a change in stratigraphic facing direction. The Anderson Bay structure is transected by S1 and S2 cleavages. Syn-D2 porphyroblasts at the Linda deposit record early sinistral S1/S2 cleavage vergence; phyllosilicate minerals in the matrix define dextral S1/S2 cleavage vergence resulting from late D2 (or D3) reactivation of the S1 cleavage. The reactivation has regional significance. Metamorphic parageneses at the Linda deposit apparently span three zones of regional metamorphism. The bulk-rock composition of the altered protolith allowed the crystallization of manganiferous garnet, zincian staurolite and F-rich biotite, thus expanding the stability fields of parageneses containing these minerals. A pressure-temperature-time trajectory is recorded by syn-D1 kyanite and by syn-D2 amphibotite-facies assemblages, which represent the culmination of metamorphism. Sphalerite geobarometry yields a pressure of about 5 kb; the maximum temperature is limited to about 550*C by the coexistence of margarite+quartz. Suiphide-silicate-oxide equilibria can be modelled in a petrogenetic grid in the SiO2- Al2O3-FeO-MgO-ZnO-K2O-H2O-S2-O2 system at fixed pressure and temperature. Metamorphic desulphida.tion of sphalerite released Zn to staurolite and gahnite. The largest massive sulphide body consists of pyrite and calcite, the latter introduced during post-tectonic synmetamorphic metasomatism.
Author: Alfred Harker
Publisher: Chapman & Hall
ISBN:
Category : Science
Languages : en
Pages : 384
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Author: Richard Edwards
Publisher: Springer Science & Business Media
ISBN: 9401180563
Category : Science
Languages : en
Pages : 563
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Book Description
Why another book about Ore Deposits? There are a number of factors which motivated us to write this text and which may provide an answer to this question. Firstly our colleagues are predominantly mining engineers and minerals processing technologists, which provides us with a different perspective of ore deposits from many academic geologists. Secondly we have found that most existing texts are either highly theoretical or merely descriptive: we have attempted to examine the practical implications of the geological setting and genetic models of particular ore deposit types. We have written the text primarily for undergraduates who are taking options in Economic Geology towards the end of a Degree Course in Geology. However, we hope that the text will also prove valuable to geologists working in the mining industry. The text is to a large extent based on a review of the existing literature up to the end of 1984. However, we have visited most of the mining districts cited in the text and have also corresponded extensively with geologists to extend our knowledge beyond the published literature. Nonetheless writing a text-book on Ore Deposits is a demanding task and it is inevitable that sins of both omission and commission have been committed. We would therefore welcome comments from readers which can be incorporated in future editions. RICHARD EDW ARDS KEITH ATKINSON Cmnhome School (~n\1illcs April 1985 Glossary Adit A horizontal, or near horizontal, passage from the surface into a mme.
Author: Paul G. Spry
Publisher:
ISBN:
Category : Metamorphic rocks
Languages : en
Pages : 332
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