Intrusion-related gold deposits

Sillitoe, Richard H.

doi:10.1007/978-1-4613-0497-5_6

Cited by 88 publications

(34 citation statements)

References 38 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…The very strong Cu signature and the presence of tellurides in type 6 gold from Balwoges in northwest Ireland is similar to nonporphyry-type stockwork and disseminated gold mineralization associated with acid to intermediate intrusions (Sillitoe, 1993). The presence of monazite inclusions within the gold, and of a small granite stock and breccia pipes within the catchment, also supports such an origin.…”

Section: General Interpretationmentioning

confidence: 64%

The Application of Microchemical Analysis of Alluvial GoldGrains to the Understanding of Complex Local and Regional GoldMineralization: A Case Study in the Irish and Scottish Caledonides

Chapman¹,

Leake²,

Moles³

et al. 2000

Economic Geology

View full text Add to dashboard Cite

Terranes of the Appalachian-Caledonian orogen north of the Iapetus suture host gold mineralization in North America, Scotland, and Ireland. To date, commercial exploitation has been confined to the Appalachian terrane of Canada. In Scotland and Ireland, regional analysis of the types of gold mineralization has been handicapped by the relatively small number of bedrock gold occurrences available for study. However, there are a large number of alluvial gold localities. A technique of microchemical characterization of gold grains has been applied to facilitate the classification of alluvial gold localities in terms of the style or styles of source mineralization, thereby permitting a more complete interpretation of regional gold mineralization.The technique of microchemical characterization used in this study classifies populations of gold grains from each locality in terms of the assemblage of opaque mineral inclusions enclosed within the gold grains and the concentration of minor alloying elements in the gold. A total of 2,400 gold grains collected from 44 sites in Ireland and Scotland have been studied. The microchemical signatures of populations of gold grains extracted from bedrock samples correlate closely with those from adjacent alluvial populations, and furthermore, our data are compatible with the descriptions of the vein mineralogy of bedrock mineralization reported by other workers. This result has facilitated informed speculation on the type of source mineralization of other alluvial occurrences where the bedrock source remains undiscovered.Populations of alluvial gold from individual localities have been grouped into larger regional data sets on the basis of similarities in microchemical signature. The signatures of these data sets were analyzed using the same criteria, and 10 classes of gold were identified. Regional analysis of the distribution of the gold classes showed that the occurrence of the four major classes correlates strongly with host terrane, irrespective of geographical location. Gold from the Southern Uplands terrane is characterized by inclusions of base metal sulfides and sulfarsenides, with the silver content of the gold being less than 15 percent. In contrast, populations of alluvial gold from the Grampian and Highland terranes commonly exhibit median silver contents of over 20 percent and frequently contain silver telluride and bismuth telluride inclusions, which are extremely rare in gold from the Southern Uplands terrane. However, in other cases, the style of mineralization is controlled by specific host or source rocks and is independent of the terrane. Two examples are gold mineralization within porphyry systems and gold associated with red-bed sediments.The study has confirmed the value of the technique of gold grain characterization, using information from both concentrations of alloying elements and inclusion assemblages as a powerful tool in interpreting complex local and regional gold mineralization.

show abstract

Section: General Interpretationmentioning

confidence: 64%

The Application of Microchemical Analysis of Alluvial GoldGrains to the Understanding of Complex Local and Regional GoldMineralization: A Case Study in the Irish and Scottish Caledonides

Chapman¹,

Leake²,

Moles³

et al. 2000

Economic Geology

View full text Add to dashboard Cite

show abstract

“…Sillitoe (1991) subdivided the intrusion-related gold deposits, excluding those in which gold is of byproduct status only, into seven categories: Sillitoe (1991) subdivided the intrusion-related gold deposits, excluding those in which gold is of byproduct status only, into seven categories:…”

Section: Intrusion-related Gold Depositsmentioning

confidence: 99%

“…Based primarily on gold mineralization in the western Pacific island arcs, which ranges from gold-enriched porphyry copper deposits to various intrusion-related and epithermal gold deposits, Sillitoe (1989Sillitoe ( , 1991 proposed a conceptual genetic model linking all of these deposit types to the evolution of porphyry systems ( Fig. 16.11).…”

Section: Intrusion-related Depositsmentioning

confidence: 99%

“…Excellent sources of information, to name a few, are Boyle (1979Boyle ( , 1982, Foster (1984Foster ( , 1991, Berger and Bethke (1985), Keppie et al (1986), Roberts (1987), Colvine et al (1988), Keays et al (1989), Groves & Foster (1991), Sillitoe (1991), Foster and Piper (1993), Kerrich and Cassidy (1994), and Arehart (1996). Excellent sources of information, to name a few, are Boyle (1979Boyle ( , 1982, Foster (1984Foster ( , 1991, Berger and Bethke (1985), Keppie et al (1986), Roberts (1987), Colvine et al (1988), Keays et al (1989), Groves & Foster (1991), Sillitoe (1991), Foster and Piper (1993), Kerrich and Cassidy (1994), and Arehart (1996).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Understanding Mineral Deposits

Misra¹

2000

103

View full text Add to dashboard Cite

“…Accord ing to the mod els pro posed by Thomp son et al (1999), , and some of the ore man i fes ta tions found in the KZS pluton and in its meta mor phic au re ole can be clas si fied as in tru sion-re lated gold de posit type. More over, calc-al ka line and al ka line mag mas were con sid ered as a pos si ble source of gold in nu mer ous gold de pos its (Richards, 1995;Spiridonov, 1996;Sillitoe, 1991Sillitoe, , 2000Sillitoe and Thomp son, 1998;Thomp son and Newberry, 2000;Jensen and Barton, 2000;Müller and Groves, 2000). The geotectonic setting of dif fer ent Cu-Au and Mo-Cu mineralisations and gold depos its re lated to al ka line magmatism are tra di tion ally ex plored in arc-zone accreted ter ranes and in ar eas of extensional tecton ics (Sillitoe, 2000;Jensen and Barton, 2000;Müller and Groves, 2000).…”

Section: Introductionmentioning

confidence: 99%

The auriferous ore mineralization and its zonal distribution around the Variscan Kłodzko-Złoty Stok granitoid pluton in the Sudetes (SW Poland) – an overview

Mikulski¹,

Speczik

2016

View full text Add to dashboard Cite

1 Pol ish Geo log i cal In sti tute -Na tional Re search In sti tute, Rakowiecka 4, 00-975 Warszawa, Po land Mikulski, S.Z., Speczik, S., 2016. The au rif er ous ore min er ali sa tion and its zonal dis tri bu tion around the Variscan K³odzko-Z³oty Stok granitoid pluton in the Sudetes (SW Po land) -an over view. Geo log i cal Quar terly, 60 (3): 650-674, doi: 10.7306/gq.1284 Due to a low level of ero sion the Variscan (Carboniferous-Mississippian) K³odzko-Z³oty Stok (KZS) granitoid pluton and its meta mor phic rock cover are unique ex am ples of the ore min er ali sa tion dis tri bu tion pat tern around a pluton. The KZS pluton formed from I-type mag mas. It is com posed mostly of high-K, metaluminous, bi o tite-and hornblende-rich granitoids of var ious com po si tions rang ing from granodiorite to monzonite. The ore min er alisation in the KZS shows spe cific zonation that reflects in ter ac tion be tween post-mag matic min er al is ing flu ids and coun try rocks of dif fer ent com po si tion. In the KZS pluton and its sur round ings the min er alisation re veals high-tem per a ture Ti-W ox ides and As-Fe sul phide-ar sen ides plus Fe-ox ides which are re placed out wards by Cu-Fe-Pb-Zn sulphides and sub se quently, in the mar ginal parts of the pluton, by the Pb-Sb-Fe sul phide min er alisation. The spe cific el e ments and the iso to pic com po si tion of sul phur in ore min er als in di cate that the metal-bear ing postmagmatic-meta mor phic hy dro ther mal flu ids, de spite their strong af fin i ties to the KZS hy brid mag matic flu ids, show also an in flu ence of vari able com po si tion of coun try rocks. Vari able al ter ation pro cesses: hornfelsitisation, skarnisation, dolomitisation, serpentinitisation, pyroxenisation, biotitisation, K-feldspatisation, sili ci fi ca tion, berezitisation, carbonatisation, prehinitisation, chloritisation, epidotisation, sericitisation, albitisation and sulphidisation de vel oped along con tacts of var i ous rock types within the coun try rocks. In more frac tured zones, trans ported el e ments were pref er en tially trapped by cal car e ous (Ca-rich) meta mor phic rocks. More over, along the di rect con tact be tween granitoids and cal car e ous rocks a high tem per a ture au rif er ous skarns with mag ne tite-pyrrhotite or/and löllingite-ar seno py rite min er alisation were formed. There are pos i tive cor re la tions be tween or ganic mat ter and Fe 2 O 3 and MgO con tents in skarns, sug gest ing remobilization of or ganic mat ter by hy dro ther mal flu ids re leased dur ing serpentinisation. The or ganic mat ter and car bon ate sam ples have very vari able d 13 C and d 18 O val ues. Most prob a bly these are the re sult of iso to pic re-equil i bra tion be tween min er als un der high tem per a tures. On the in ti mate con tact of granitoids with less per me able amphibolitic hornfelses a high tem per a ture ti tan ite-schee lite min er alisation of veinlet-im preg na tion type oc curred, while ther mal and metasomatic al teration of the en vel op ing more per...

show abstract

Intrusion-related gold deposits

Cited by 88 publications

References 38 publications

The Application of Microchemical Analysis of Alluvial GoldGrains to the Understanding of Complex Local and Regional GoldMineralization: A Case Study in the Irish and Scottish Caledonides

The Application of Microchemical Analysis of Alluvial GoldGrains to the Understanding of Complex Local and Regional GoldMineralization: A Case Study in the Irish and Scottish Caledonides

Understanding Mineral Deposits

The auriferous ore mineralization and its zonal distribution around the Variscan Kłodzko-Złoty Stok granitoid pluton in the Sudetes (SW Poland) – an overview

Contact Info

Product

Resources

About