Some phase relations in the hydrothermally altered rocks of porphyry copper deposits

Creasey, S. C.

doi:10.2113/gsecongeo.54.3.351

Cited by 26 publications

(15 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A good example for this can be found in porphyry copper deposit systems (Creasey 1959). In this context, the alteration mineral assemblages or the defined zones in porphyry copper systems have been classified using a specific terminology: potassic, phyllic, argillic, and propylitic types.…”

Section: Classification Of Hydrothermal Alterationmentioning

confidence: 99%

Formation of Clay Minerals in Hydrothermal Environments

Inoue¹

1995

Origin and Mineralogy of Clays

148

102

View full text Add to dashboard Cite

Formation of clay minerals under hydrothermal influence is the result of rock alteration by circulating hot water in the Earth's crust. A pre-existing rockforming mineral assemblage is altered to a new set of minerals which are more stable under the hydrothermal conditions of temperature, pressure, and fluid composition. The interaction of hot water and rocks forms a spatially and temporally regular zonal pattern of new clay minerals, as the fluid with cooling temperature moves through the surrounding rock mass. This chapter discusses the formation of clay minerals in such dynamic processes of hydrothermal alteration. The approach is one of clay-mineral facies formed under conditions of massive alteration in the rocks. The chemical and mineralogical changes which occur on the scale of a rock or rock mass are considered to have been dealt with in the preceding chapter. The exact process of change via local, veininfluenced exchange processes is ignored for simplicity (see Chap. 6).Hydrothermal alteration is often accompanied by hydrothermal ore deposits and active geothermal systems which are of economic importance. A huge amount of field and laboratory data on alteration mineralogy and geochemistry have been accumulated through exploration of hydrothermal ore deposits and active geothermal fields due to the economic interest of this geologic process. Additionally, the amount of theoretical information pertaining to the hydrothermal alteration has been rapidly increasing in the last decade. These data have been reviewed from various aspects of interest, e.g. in connection with the geneses of porphyry copper deposits (Meyer and Hemley 1969; Rose and Burt 1979;Beane 1982), epithermal ore deposits (Hayba et al. 1985;Henley 1985;Heald et al. 1987;Shikazono 1988), geothermal systems associated with recent volcanism (Ellis and Mahon 1977;Browne 1978;Utada 1980;Henley and Ellis 1983), Kuroko deposits (Utada 1988), and hydrothermal systems at sea floor spreading centers (Rona et al. 1983, for a summary). In the present review, particular attention has been paid to the formation of clay minerals under these different hydrothermal environments.Initially, the general backgrounds of hydrothermal alteration will be briefly reviewed (Sect. 7.1). Section 7.2 is concerned with the terminology and definition of hydrothermal alteration. Sections 7.3 and 7.4 introduce the geo-B. Velde (ed.), Origin and Mineralogy of Clays

show abstract

Section: Classification Of Hydrothermal Alterationmentioning

confidence: 99%

Formation of Clay Minerals in Hydrothermal Environments

Inoue¹

1995

Origin and Mineralogy of Clays

148

102

View full text Add to dashboard Cite

show abstract

“…The modem approach to classifying alteration types in terms of mineral assemblages, first devised by Creasey (1959), has been developed to a large extent from many studies on porphyry copper deposits. A simple classification scheme is to designate an alteration type by the most abundant or most obvious mineral in the altered rock: for example, sericitization, dolomitization, chloritization, silicification, 122 CHAPTER 3 etc.…”

mentioning

confidence: 99%

Understanding Mineral Deposits

Misra¹

2000

103

View full text Add to dashboard Cite

“…They may be broadly grouped, following Creasey (1959, andin Titley andHicks, 1966), as propylitic, potassic, and quartzsericite types. Many of the altered rocks, however, do not conveniently fit into these groupings because of the presence of metastable or unstable mineral phases or because of the lack of diagnostic minerals in the sampled rocks.…”

Section: Altered Rockmentioning

confidence: 99%

Tertiary mineralization and hydrothermal alteration in the Stinkingwater mining region, Park County, Wyoming

Fisher¹

1972

View full text Add to dashboard Cite

Some phase relations in the hydrothermally altered rocks of porphyry copper deposits

Cited by 26 publications

References 0 publications

Formation of Clay Minerals in Hydrothermal Environments

Formation of Clay Minerals in Hydrothermal Environments

Understanding Mineral Deposits

Tertiary mineralization and hydrothermal alteration in the Stinkingwater mining region, Park County, Wyoming

Contact Info

Product

Resources

About