Diagenetic pyrite as a source for metals in orogenic gold deposits, Otago Schist, New Zealand
نویسندگان
چکیده
منابع مشابه
Noble gases fingerprint a metasedimentary fluid source in the Macraes orogenic gold deposit, New Zealand
The world-class Macraes orogenic gold deposit (∼10Moz resource) formed during the late metamorphic uplift of a metasedimentary schist belt in southern New Zealand. Mineralising fluids, metals and metalloids were derived from within the metasedimentary host. Helium and argon extracted from fluid inclusions in sulphide mineral grains (three crush extractions from one sample) have crustal signatur...
متن کاملReactions leading to the formation and breakdown of stilpnomelane in the Otago Schist, New Zealand
Semi-pelitic rocks ranging in grade from the prehnite–pumpellyite to the greenschist facies from southeastern Otago, New Zealand, have been investigated in order to evaluate the reactions leading to formation and breakdown of stilpnomelane. Detrital grains of mica and chlorite along with fine-grained authigenic illite and chlorite occur in lower-grade rocks with compactional fabric parallel to ...
متن کاملThallium isotopes in early diagenetic pyrite – A paleoredox proxy?
This paper presents the first study of Tl isotopes in early diagenetic pyrite. Measurements from two sections deposited during the Toarcian Ocean Anoxic Event (T-OAE, 183 Ma) are compared with data from Late Neogene (<10 Ma) pyrite samples from ODP legs 165 and 167 that were deposited in relatively oxic marine environments. The Tl isotope compositions of Late Neogene pyrites are all significant...
متن کاملGIS Modelling of Gold Prospectivity in New Zealand
Gold production in New Zealand has been significant since the mid 1800s, totalling 900 t (29 Moz) to 2005. In addition, there is potential for a further 1230 t (39.5 Moz) of gold in known and undiscovered deposits. Most of the gold has originated from epithermal and mesothermal (orogenic) hydrothermal systems. Epithermal gold occurs in the Northland, Coromandel and Taupo volcanic zones in quart...
متن کاملMaori experience of community treatment orders in Otago, New Zealand.
OBJECTIVE To consider the impact of community treatment orders (CommTOs) on Maori patients and their whanau (extended family) and the associated views of mental health professionals. METHOD As a distinct aspect of a larger study of CommTOs, eight Maori patients under compulsory community care were interviewed and, where possible, members of their whanau. Associated interviews were held with t...
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ژورنال
عنوان ژورنال: New Zealand Journal of Geology and Geophysics
سال: 2012
ISSN: 0028-8306,1175-8791
DOI: 10.1080/00288306.2012.682282