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Briggs, Roger M. (1975) Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia, University of Auckland.

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Reference TypeThesis/Dissertation
TitleStructure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia
AuthorsBriggs, Roger M.Author
Year1975
PublisherUniversity of Auckland
URL
Original EntryBriggs, R. M. (1975). Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia (Doctoral dissertation, ResearchSpace@ Auckland)
Classification
Not set		LoC
Not set
Mindat Ref. ID15947009Long-form Identifiermindat:1:5:15947009:3
GUID0
Full ReferenceBriggs, Roger M. (1975) Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia, University of Auckland.
Plain TextBriggs, Roger M. (1975) Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia, University of Auckland.
Abstract/NotesThe area studied, covers about 150 square kilometers in the northern end of New Caledonia in the lower parts of the Diahot River near OuΓ©goa. The rocks consist dominantly of a metamorphosed Cretaceous sedimentary-igneous sequence of carbonaceous pelites with intercalated basaltic rocks and rhyolitic tuffs. The Cretaceous sequence is flanked to the southwest by Eocene rocks consisting mainly of siliceous argillites, phtanites (massive cherts) and limestones. High-pressure metamorphism, radiometrically dated at 38-21 m.y. (Oligocene-lowermost Miocene) by Coleman (1967), increases progressively in grade towards the northeast in a continuous sequence from lawsonite-albite facies through glaucophanitic greenschists to eclogitic glaucophanitic albite-epidote amphibolites. Lowest, grade rocks occur in the southwest near the Cretaceous-Tertiary boundary and the highest grade rocks are exposed along the east coast and as tectonically-emplaced blocks in fault zones around OuΓ©goa. Regional metamorphic assemblages are defined with respect, to four zones in pelitic parents which in order of increasing metamorphic grade are:- (1) lowest grade rocks, (2) lawsonite zone, (3) transitional zone, (4) epidote zone. Metamorphic isograds are mapped for paraschist lawsonite, Na-amphibole, garnet and epidote; and for pumpellyite, Na-amphibole, lawsonite and omphacite in metabasalts. In the Cretaceous rocks the regional strike of the foliation is northwest-southeast with dips to the southwest, although small-scale steeply-plunging folds are abundant. On a regional scale the major structure is an open to isoclinal, asymmetric, reclined fold with a sinistral vergence, trending southwest, and it plunges steeply down the dip of the regional foliation. This folding occurred largely synchronously with high-pressure metamorphism. During retrogressive metamorphism, large-scale trans-current sinistral faulting occurred, striking northwest-southeast and dipping southwest. In the region north and east of OuΓ©goa these faults characteristically occur as zones up to 2 km wide occupied by high-grade ortho- and paragneisses (glaucophanites) and serpentinites, and form a complex anastomosing network. This faulting, accompanied by broad flexuring, has removed some parts of the metamorphic sequence resulting in constrictions and broad, flexuring of the isograd patterns in certain areas of the field. Small-scale kink and chevron folding has occurred late in the tectonic history and post-date both the steeply-plunging folds and the metamorphism. Stratiform Cu-Pb-Zn mineralization with minor amounts of Au and Ag occur at five relatively major sites (Pilou, MΓ©rΓ©trice, Fern-Hill, Balade and Murat mines) and at numerous smaller localities throughout the field. The mineralization is restricted to definite stratigraphic horizons in the Cretaceous sequence where black carbonaceous phyllites are associated and interbedded with rhyolitic metatuffs. The sulphide ores are well laminated, show relict sedimentary textures, and occur as layers and lenses which are conformable with the host rocks. The deposits are thought to be sedimentary-volcanic in origin and derived from acid volcanic metalliferous exhalations which have undergone chemical precipitation and sedimentation in localized, black shale, euxinic environments on the sea floor. All of the deposits have been subjected to and variously modified by the metamorphism. An attempt is made to explain the large-scare structural features observed in the Diahot region in terms of plate tectonic theory.

Map of Localities

Locality Pages

LocalityCitation Details
26e Soldat prospect, Diahot River Valley, Northern Province, New Caledonia, France
Delaveuve prospect, Diahot River Valley, Northern Province, New Caledonia, France
Murat Mine, Diahot River Valley, Northern Province, New Caledonia, France
Pilou West prospect, Diahot River Valley, Northern Province, New Caledonia, France
Ao Mine, Poum, Northern Province, New Caledonia, France
Pilou-Nemou Mine, Poum, Northern Province, New Caledonia, France

Mineral Occurrences

LocalityMineral(s)
26e Soldat prospect, Diahot River Valley, Northern Province, New Caledonia, Franceβ“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Covellite, β“˜ Ilmenite, β“˜ Malachite, β“˜ Pyrite, β“˜ Quartz
Delaveuve prospect, Diahot River Valley, Northern Province, New Caledonia, Franceβ“˜ Aegirine, β“˜ Azurite, β“˜ Chalcopyrite, β“˜ Ilmenite, β“˜ Limonite, β“˜ Magnetite, β“˜ Malachite, β“˜ Pyrite, β“˜ Quartz
Murat Mine, Diahot River Valley, Northern Province, New Caledonia, Franceβ“˜ Azurite, β“˜ Bornite, β“˜ Glaucophane, β“˜ Ilmenite, β“˜ Limonite, β“˜ Magnetite, β“˜ Malachite, β“˜ Marcasite, β“˜ Pyrrhotite, β“˜ Sphalerite, β“˜ Stilpnomelane
Pilou West prospect, Diahot River Valley, Northern Province, New Caledonia, Franceβ“˜ Azurite, β“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Chlorite Group, β“˜ Limonite, β“˜ Malachite, β“˜ Quartz
Balade Mine, OuΓ©goa, Northern Province, New Caledonia, Franceβ“˜ Apatite, β“˜ Arsenopyrite, β“˜ Azurite, β“˜ Bornite, β“˜ Calcite, β“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Chlorite Group, β“˜ Chloritoid, β“˜ Covellite, β“˜ Cubanite, β“˜ Cuprite, β“˜ Galena, β“˜ Garnet Group, β“˜ Glaucophane, β“˜ Grunerite, β“˜ Hematite, β“˜ Ilmenite, β“˜ Limonite, β“˜ Mackinawite, β“˜ Magnetite, β“˜ Malachite, β“˜ Marcasite, β“˜ Mica Group, β“˜ Native Copper, β“˜ Native Gold, β“˜ Native Selenium, β“˜ Native Silver, β“˜ Pyrite, β“˜ Pyrrhotite, β“˜ Quartz, β“˜ Sphalerite, β“˜ Stilpnomelane, β“˜ Talc, β“˜ Tenorite, β“˜ Titanite
Banianou prospect, OuΓ©goa, Northern Province, New Caledonia, Franceβ“˜ Cerussite, β“˜ Limonite, β“˜ Malachite
Fern Hill Mine, OuΓ©goa, Northern Province, New Caledonia, Franceβ“˜ Arsenopyrite, β“˜ Bornite, β“˜ Covellite, β“˜ Idaite, β“˜ Jarosite, β“˜ Limonite, β“˜ Malachite, β“˜ Native Gold, β“˜ Opal, β“˜ Pyrophyllite, β“˜ Quartz, β“˜ Sphalerite, β“˜ Tetrahedrite Subgroup, β“˜ Titanite
MΓ©rΓ©trice Mine, OuΓ©goa, Northern Province, New Caledonia, Franceβ“˜ Acanthite, β“˜ Albite, β“˜ Anglesite, β“˜ Arsenopyrite, β“˜ Azurite, β“˜ Calcite, β“˜ Cerussite, β“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Covellite, β“˜ Dolomite, β“˜ Galena, β“˜ Jalpaite, β“˜ Lawsonite, β“˜ Limonite, β“˜ Malachite, β“˜ Muscovite, β“˜ Native Silver, β“˜ Pumpellyite Subgroup, β“˜ Pyrite, β“˜ Pyromorphite, β“˜ Pyrrhotite, β“˜ Quartz, β“˜ Smithsonite, β“˜ Sphalerite, β“˜ Tetrahedrite Subgroup, β“˜ Titanite
Ao Mine, Poum, Northern Province, New Caledonia, Franceβ“˜ Azurite, β“˜ Calcite, β“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Chlorite Group, β“˜ Covellite, β“˜ Dolomite, β“˜ Galena, β“˜ Lawsonite, β“˜ Limonite, β“˜ Magnesite, β“˜ Malachite, β“˜ Pyrite, β“˜ Quartz, β“˜ Sphalerite, β“˜ Tenorite, β“˜ Titanite
Pilou-Nemou Mine, Poum, Northern Province, New Caledonia, Franceβ“˜ Albite, β“˜ Azurite, β“˜ Calcite, β“˜ Chalcocite, β“˜ Chalcopyrite, β“˜ Chlorite Group, β“˜ Covellite, β“˜ Dolomite, β“˜ Epidote, β“˜ Galena, β“˜ Idaite, β“˜ Limonite, β“˜ Magnesite, β“˜ Malachite, β“˜ Pumpellyite Subgroup, β“˜ Pyrite, β“˜ Pyrophyllite, β“˜ Pyrrhotite, β“˜ Quartz, β“˜ Sphalerite

See Also

These are possibly similar items as determined by title/reference text matching only.

Briggs, R.M. (1975) Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia. Thesis (PhD-Geology), University of Auckland, 1975.
Briggs, R. M. (1975). Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia (Doctoral dissertation, ResearchSpace@ Auckland).
Briggs, R. M., Kobe, H. W., & Black, P. M. (1977). High-pressure metamorphism of stratiform sulphide deposits from the Diahot region, New Caledonia. Mineralium Deposita, 12(3), 263-279. Briggs, R. M. (1975). Structure, metamorphism and mineral deposits in the Diahot region, northern New Caledonia (Doctoral dissertation, ResearchSpace@ Auckland)
Briggs, R. M., Kobe, H. W., & Black, P. M. (1977). High-pressure metamorphism of stratiform sulphide deposits from the Diahot region, New Caledonia. Mineralium Deposita, 12 (3), 263-279.
Briggs, R.M., Kobe, H.W., Black, P.M. (1977) High-pressure metamorphism of stratiform sulphide deposits from the Diahot region, New Caledonia. Mineralium Deposita, 12 (3) doi:10.1007/bf00206166
BLACK, P. M., MAURIZOT, P., GHENT, E. D., STOUT, M. Z. (1993) Mg?Fe carpholites from aluminous schists in the Diahot region and implications for preservation of high-pressure/low-temperature schists, northern New Caledonia. Journal of Metamorphic Geology, 11 (3) 455-460 doi:10.1111/j.1525-1314.1993.tb00162.x
Briggs, R. M. (1978) Ferrocarpholite associated with low-grade blueschists, northern New Caledonia. Mineralogical Magazine, 42 (321) 147 doi:10.1180/minmag.1978.042.321.25
WARREN, I. (2005) Geology, geochemistry, and genesis of the El Pe˜nón epithermal Au-Ag deposit, northern Chile: Characteristics of a bonanza-grade deposit and techniques for exploration. Unpublished Ph.D. thesis, New Zealand, University of Auckland, Auckland, New Zealand, 428 pp.
Warren, I. (2005) Geology, geochemistry, and genesis of the El Pe˜nón epithermal Au-Ag deposit, northern Chile: Characteristics of a bonanza-grade deposit and techniques for exploration. Unpublished Ph.D. thesis, New Zealand, University of Auckland, Auckland, New Zealand, 428 pages.
Taylor, Matthew D., Kim, Nick D., Briggs, Roger M., Taylor, Amy, Guinto, Danilo F. (2012) An investigation into the process of dealumination in soils of the Auckland, Bay of Plenty and Waikato regions of New Zealand. Applied Clay Science, 64. 18-24 doi:10.1016/j.clay.2012.06.008
Zeballos, Ariana (2018) Geological, Geochemical and Mineralogical Characterization of Non-Metallic Mineral Deposits in the La Paz Region, Bolivia, LuleΓ₯ University of Technology.
 
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