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Article: Typomorphic characteristics of pyrite from lode gold deposits in the North China craton: Implications for fluid mineralization

TitleTypomorphic characteristics of pyrite from lode gold deposits in the North China craton: Implications for fluid mineralization
Authors
KeywordsFluid Mineralization
Lode Gold Deposit
North China Craton
Pyrite
Typical Characteristics
Issue Date2004
Citation
Kuangwu Yanshi, 2004, v. 24 n. 3, p. 93-102 How to Cite?
AbstractThis paper classifies the hydrothermal mineralization of lode gold deposits in North China craton into three stages and summaries the mineralogical, compositional and thermoelectric characteristics of pyrites of different metallogenic stages. It has been stated that the middle stage pyrites, usually called ash-like pyrites, are dark to yellow-green colored, fine to micro-grained, pentagonal dodecahedron-shaped, hypidiomorphically-allotriomorphically crystallized, and roughly surfaced with indecent angles. Therefore, the middle stage pyrites have high surficial energy to absorb gold from the ore-forming fluids, and then have high content of gold. In addition, the pyrites in middle stage show stronger thermoelectricity than those of the early and late stages. Through results obtained from theoretical and experimental studies, it is interpreted that input of trace elements resulted in lattice aberration, electric charge imbalance and thermoelectric enhancement in pyrite. Hence the trinity of the mineralogical, compositional and thermoelectric characteristics of pyrite could be employed as gold exploration indicator. The ash-like pyrites were rapidly formed from a fluid suddenly supersaturated or changed in physicochemical nature. Boiling and mixing of fluids are two most important possibilities. Since the temporal changes in typomorphical characteristics and geneses of pyrites of different stages are entirely in accord with the three-stage model of collisional orogeny, metallogeny and fluid flow (CMF model), the CMF model is employed to understand the developing position and time of ash-like pyrites in the orogenic-type lode gold systems. This provides mineralogical evidence for the CMF model, and shows the accuracy of the typical characteristics established for gold-enriched pyrites. The brittle-ductile transition level of a ore-hosting fault and the transition regime from regional compression to extension are most favorable for fluid boiling and fluid mixing, and therefore, are the best site and time to form high-grade gold ores.
Persistent Identifierhttp://hdl.handle.net/10722/92172
ISSN
2015 SCImago Journal Rankings: 0.169
References

 

DC FieldValueLanguage
dc.contributor.authorLi, Jen_HK
dc.contributor.authorChen, Y-Jen_HK
dc.contributor.authorLiu, Y-Xen_HK
dc.date.accessioned2010-09-17T10:38:12Z-
dc.date.available2010-09-17T10:38:12Z-
dc.date.issued2004en_HK
dc.identifier.citationKuangwu Yanshi, 2004, v. 24 n. 3, p. 93-102en_HK
dc.identifier.issn1001-6872en_HK
dc.identifier.urihttp://hdl.handle.net/10722/92172-
dc.description.abstractThis paper classifies the hydrothermal mineralization of lode gold deposits in North China craton into three stages and summaries the mineralogical, compositional and thermoelectric characteristics of pyrites of different metallogenic stages. It has been stated that the middle stage pyrites, usually called ash-like pyrites, are dark to yellow-green colored, fine to micro-grained, pentagonal dodecahedron-shaped, hypidiomorphically-allotriomorphically crystallized, and roughly surfaced with indecent angles. Therefore, the middle stage pyrites have high surficial energy to absorb gold from the ore-forming fluids, and then have high content of gold. In addition, the pyrites in middle stage show stronger thermoelectricity than those of the early and late stages. Through results obtained from theoretical and experimental studies, it is interpreted that input of trace elements resulted in lattice aberration, electric charge imbalance and thermoelectric enhancement in pyrite. Hence the trinity of the mineralogical, compositional and thermoelectric characteristics of pyrite could be employed as gold exploration indicator. The ash-like pyrites were rapidly formed from a fluid suddenly supersaturated or changed in physicochemical nature. Boiling and mixing of fluids are two most important possibilities. Since the temporal changes in typomorphical characteristics and geneses of pyrites of different stages are entirely in accord with the three-stage model of collisional orogeny, metallogeny and fluid flow (CMF model), the CMF model is employed to understand the developing position and time of ash-like pyrites in the orogenic-type lode gold systems. This provides mineralogical evidence for the CMF model, and shows the accuracy of the typical characteristics established for gold-enriched pyrites. The brittle-ductile transition level of a ore-hosting fault and the transition regime from regional compression to extension are most favorable for fluid boiling and fluid mixing, and therefore, are the best site and time to form high-grade gold ores.en_HK
dc.languageengen_HK
dc.relation.ispartofKuangwu Yanshien_HK
dc.subjectFluid Mineralizationen_HK
dc.subjectLode Gold Depositen_HK
dc.subjectNorth China Cratonen_HK
dc.subjectPyriteen_HK
dc.subjectTypical Characteristicsen_HK
dc.titleTypomorphic characteristics of pyrite from lode gold deposits in the North China craton: Implications for fluid mineralizationen_HK
dc.typeArticleen_HK
dc.identifier.emailChen, Y:ychenc@hkucc.hku.hken_HK
dc.identifier.authorityChen, Y=rp1318en_HK
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.scopuseid_2-s2.0-10644237959en_HK
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-10644237959&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume24en_HK
dc.identifier.issue3en_HK
dc.identifier.spage93en_HK
dc.identifier.epage102en_HK

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