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Titolo:
Potash-rich magmatism and associated gold-copper mineralization in the Yishu deep fault zone and its vicinity, eastern China
Autore:
Qiu, JS; Loh, CH; McInnes, BIA; Zhou, JC;
Indirizzi:
Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China Nanjing Univ Nanjing Peoples R China 210093 jing 210093, Peoples R China Natl Taiwan Univ, Dept Geol, Taipei 10770, Taiwan Natl Taiwan Univ Taipei Taiwan 10770 iv, Dept Geol, Taipei 10770, Taiwan CSIRO, Div Explorat & Min, N Ryde, NSW 2113, Australia CSIRO N Ryde NSW Australia 2113 plorat & Min, N Ryde, NSW 2113, Australia
Titolo Testata:
RESOURCE GEOLOGY
fascicolo: 4, volume: 50, anno: 2000,
pagine: 269 - 280
SICI:
1344-1698(2000)50:4<269:PMAAGM>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
PAPUA-NEW-GUINEA; VOLCANIC-ROCKS; NORTH CHINA; MANTLE; COLLISION; DEPOSIT; BEARING; ORIGIN; ARC;
Keywords:
potash-rich magmatism; gold-copper mineralization; Mesozoic; Yishu deep fault zone; eastern China;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
42
Recensione:
Indirizzi per estratti:
Indirizzo: Qiu, JS Nanjing Univ, Dept Earth Sci, Nanjing 210093, Peoples R China Nanjing Univ Nanjing Peoples R China 210093 093, Peoples R China
Citazione:
J.S. Qiu et al., "Potash-rich magmatism and associated gold-copper mineralization in the Yishu deep fault zone and its vicinity, eastern China", RESOUR GEOL, 50(4), 2000, pp. 269-280

Abstract

The Mesozoic potash-rich volcanic rocks which hosted several gold or gold (copper) deposits are widely distributed around the Yishu deep fault zone, eastern China. Lithologically, these rocks include basaltic trachyandesite,trachyandesite, latite and trachyte, of which the trachyandesite and latite are the predominant rock types. Whole-rock Rb-Sr isochron ages and Ar-40-Ar-39 plateau dates of them are 108.2 similar to 119.6 Ma and 114.7 similarto 124.3 Ma, respectively. Chemically, they are characterized by high and variable Al2O3 contents, high K2O+Na2O values, and high K2O/Na2O and Fe2O3/FeO ratios. The rocks also have enriched LILE and LREE concentrations, low HFSE abundance, and display extraordinary Sr-Nd isotope signatures (I-Sr = 0.7084 similar to 0.7125, epsilon (Nd)(t) = -9.43 similar to -18.07). Integrated geological and geochemical data suggest that they were formed in a continental-arc setting and most likely originated from the partial melting of enriched mantle which was induced by source contamination of subducted continental crustal materials. Gold (copper) deposits in this district are closely related to Mesozoic volcanic-subvolcanic magmatism. They are frequently located either at the margin or adjacent to the volcanic basins. Most of them are spatially associated with maar-diatreme systems and/or flow-dome complexes. The formations oftwo gold (copper) deposits, the Qibaoshan breccia pipe-porphyry type Au-Cudeposit and the Guilaizhuang tellurium-gold type epithermal Au deposit, have been proved to be in close relation with potash-rich magmatism. The genetic relations between potash-rich magmatism and Cu-Au mineralization is still quite unclear. Detailed review of the previous works demonstrates that the high contents of volatiles (such as H2O, CO2, S, F and Cl, especially F and Cl) and the high oxidation state of the potash-rich magmas maybe the main favorable factors for the formation of the Cu-Au deposits.

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Documento generato il 23/09/20 alle ore 21:49:36