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NARROW
GeoRef Subject
-
all geography including DSDP/ODP Sites and Legs
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
High Atlas (1)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
High Atlas (1)
-
-
Rif (1)
-
-
-
West Africa
-
Ghana (3)
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Liberia (1)
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Nimba Mountains (1)
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Antarctica (1)
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Arctic region (1)
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Asia
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Arabian Peninsula
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Oman (1)
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Saudi Arabia (1)
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Central Asia
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Pamirs (1)
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Chukotka Russian Federation (1)
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Far East
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China
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Nanling (1)
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Xinjiang China
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Indonesia
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Himalayas
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Middle East
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Mexico
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Maryland
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Massachusetts
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oxygen
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silicon
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fossils
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Graptolithina
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Invertebrata
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Porifera (1)
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microfossils
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Plantae
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geochronology methods
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thermochronology (1)
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U/Pb (12)
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geologic age
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Cenozoic
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Tertiary
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Neogene
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Paleogene
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Oligocene (1)
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Mesozoic
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Paleozoic
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Carboniferous
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lower Paleozoic (4)
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middle Paleozoic (1)
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Ordovician
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Permian
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Shoo Fly Complex (1)
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Silurian (4)
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upper Paleozoic
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Calaveras Formation (1)
-
-
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Precambrian
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Carrizo Mountain Formation (1)
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upper Precambrian
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Proterozoic
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Mesoproterozoic (1)
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upper Sinian (1)
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Paleoproterozoic
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Birimian (2)
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Sinian
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Doushantuo Formation (1)
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upper Sinian (1)
-
-
-
-
-
Saxothuringian (1)
-
-
igneous rocks
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igneous rocks
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plutonic rocks
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diorites
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gabbros (2)
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granodiorites (2)
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volcanic rocks
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pyroclastics
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ophiolite (3)
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metamorphic rocks
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gondite (2)
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metasomatic rocks
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slates (11)
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minerals
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carbonates
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oxides
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phosphates
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silicates
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chain silicates
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clinoamphibole
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actinolite (1)
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arfvedsonite (1)
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hornblende (3)
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richterite (1)
-
-
-
carpholite (1)
-
pyroxene group
-
alkalic pyroxene (1)
-
-
-
framework silicates
-
feldspar group
-
alkali feldspar
-
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-
-
plagioclase
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peristerite (1)
-
-
-
silica minerals
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jasper (1)
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quartz (6)
-
-
-
orthosilicates
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nesosilicates
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chloritoid (3)
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garnet group (3)
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kyanite (1)
-
titanite group
-
titanite (2)
-
-
zircon group
-
zircon (10)
-
-
-
sorosilicates
-
epidote group
-
epidote (1)
-
-
pumpellyite group
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pumpellyite (1)
-
-
-
-
sheet silicates
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chlorite group
-
chlorite (6)
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sudoite (2)
-
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clay minerals
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illite (3)
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mica group
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phengite (2)
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serpentine group
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talc (1)
-
-
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sulfates
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-
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sulfides
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pyrite (1)
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pyrrhotite (1)
-
-
tungstates
-
scheelite (2)
-
-
-
Primary terms
-
absolute age (24)
-
Africa
-
North Africa
-
Atlas Mountains
-
Moroccan Atlas Mountains
-
High Atlas (1)
-
-
-
Morocco
-
Moroccan Atlas Mountains
-
High Atlas (1)
-
-
Rif (1)
-
-
-
West Africa
-
Ghana (3)
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Liberia (1)
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Nimba Mountains (1)
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-
-
Antarctica (1)
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Arctic region (1)
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Asia
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Amur Russian Federation (1)
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Arabian Peninsula
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Oman (1)
-
Saudi Arabia (1)
-
-
Central Asia
-
Pamirs (1)
-
-
Chukotka Russian Federation (1)
-
Far East
-
China
-
Dabie Mountains (1)
-
Nanling (1)
-
Shaanxi China (1)
-
Sulu Terrane (1)
-
Xinjiang China
-
Tarim Basin (1)
-
-
-
Indonesia
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Billiton (1)
-
-
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Himalayas
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Kumaun Himalayas (1)
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-
Indian Peninsula
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India
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Gujarat India (1)
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Khetri India (1)
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Madhya Pradesh India (1)
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Rajasthan India (2)
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Uttarakhand India
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Almora India (1)
-
-
-
-
Middle East
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Turkey (1)
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Tien Shan (1)
-
-
Atlantic Ocean
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-
Atlantic region (1)
-
Australasia
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Australia
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New South Wales Australia (1)
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Queensland Australia
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Cloncurry mining district (1)
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Mount Isa Inlier (1)
-
-
-
-
biogeography (1)
-
Canada
-
Eastern Canada
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Gander Zone (1)
-
Maritime Provinces
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New Brunswick (2)
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Nova Scotia
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Cobequid Fault (1)
-
-
-
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ABSTRACT West Avalonia is a composite terrane that rifted from the supercontinent Gondwana in the Ordovician and accreted to Laurentia during the latest Silurian to Devonian Acadian orogeny. The nature and extent of West Avalonia are well constrained in Nova Scotia, New Brunswick, and Newfoundland, Canada, by U-Pb detrital zircon data and/or isotope geochemistry of (meta)sedimentary and igneous rocks. The southeastern New England Avalon terrane in eastern Massachusetts, Connecticut, and Rhode Island has generally been interpreted as an along-strike continuance of West Avalonia in Canada, but the ages and origins of metasedimentary units along the western boundary of the Avalon terrane in Massachusetts and Connecticut remain poorly constrained. In this study, new detrital zircon U-Pb and Lu-Hf laser-ablation–inductively coupled plasma–mass spectrometry (LA-ICP-MS) data from three samples of metasedimentary units along the western boundary of the southeastern New England Avalon terrane in Connecticut and Massachusetts were compared with existing data to test whether these metasedimentary units can be correlated along strike. The data were also compared with existing detrital zircon U-Pb and εHf data in New England and Canada in order to constrain the extent and provenance of West Avalonia. The maximum depositional age of two of the three detrital zircon samples analyzed in this study, based on the youngest single grain in each sample (600 ± 28 Ma, n = 1; 617 ± 28 Ma, n = 1) and consistency with existing analyses elsewhere in the southeastern New England Avalon terrane, is Ediacaran, while that of the third sample is Tonian (959 ± 40 Ma, n = 4). Detrital zircon analyses of all three samples from this study showed similar substantial Mesoproterozoic and lesser Paleoproterozoic and Archean populations. Other existing detrital zircon U-Pb data from quartzites in the southeastern New England Avalon terrane show similar Tonian populations with or without Ediacaran grains or populations. Most published detrital zircon U-Pb data from (meta)sedimentary rocks in West Avalonia in Canada yielded Ediacaran youngest detrital zircon age populations, except for a quartzite unit within the Gamble Brook Formation in the Cobequid Highlands of Nova Scotia, which showed a Tonian maximum depositional age, and otherwise a nearly identical detrital zircon signature with rocks from the southeastern New England Avalon terrane. All samples compiled from the southeastern New England Avalon terrane and West Avalonia in Canada show main age populations between ca. 2.0 Ga and ca. 1.0 Ga, with major peaks at ca. 1.95, ca. 1.50, ca. 1.20, and ca. 1.00 Ga, and minor ca. 3.1–3.0 Ga and ca. 2.8–2.6 Ga populations. The εHf ( t ) values from the three samples yielded similar results to those from West Avalonia in Canada, suggesting that both regions were derived from the same cratonic sources. The εHf ( t ) values of all West Avalonian samples overlap with both Amazonia and Baltica, suggesting that there is a mixed signature between cratonic sources, possibly as a result of previous collision and transfer of basement fragments between these cratons during the formation of supercontinent Rodinia, or during subsequent arc collisions.
Tracking mineral evolution and element mobility during albitisation and subsequent kaolinisation of phyllite rocks: A case study from the Verrucano of Monti Pisani, Tuscany, Italy
Spatial distribution prediction of pre-Sinian volcanic and metamorphic rocks in Xinhenan-Sandaoqiao area, Northern Tarim Basin
Strain Partitioning along Terrane Bounding and Intraterrane Shear Zones: Constraints from a Long-Lived Transpressional System in West Gondwana (Ribeira Belt, Brazil)
The Age of Gold Mineralization of the Unglichikan Deposit (Russian Far East): Results of 40 Ar/ 39 Ar Dating
Metal sources in the Proterozoic Vazante-Paracatu sediment-hosted Zn District, Brazil: Constraints from Pb isotope compositions of meta-siliciclastic units
Late Cretaceous black shales from the Tuscan Sedimentary Succession (northern Tuscany, Italy): geochemistry and ore mineralogy
Overview of Naturally Occurring Asbestos in California and Southwestern Nevada
New constraints from U–Pb dating of detrital zircons on the palaeogeographic origin of metasediments in the Talea Ori, central Crete
Abstract Cleavage refraction angles are used to estimate effective viscosity contrasts between interlayered quartzites and phyllites within the Baraboo Syncline, Wisconsin, USA. Both types of layers contain two major phases, quartz and pyrophyllite, with minor amounts of hematite. Quartz (with minor hematite) behaves as the strong phase and pyrophyllite acts as the weak phase. Cleavage refraction directly relates to mineralogy with a linear relationship between bedding/cleavage angle and strong-phase concentration. Mineralogy exerts first-order control over effective viscosity contrasts, which are generally small, in most cases <10. Effective viscosity contrasts are consistent across the fold, so are likely not to be highly strain dependent and indicate approximate linear viscous rheology. Microstructures suggest deformation was dominated by dislocation creep in layers with high quartz concentrations and diffusive mass transfer in layers with lower quartz concentrations, and that the transition of the deformation mechanism is gradual. Thus, the rheological flow laws at the small scale may not reflect the bulk flow law at the large scale over the span of the deformation. Effective viscosity contrasts allow an evaluation of samples compared to theoretical two-phase mixtures. The analysed samples most closely resemble the Reuss bound of two-phase mixtures, regardless of the mineralogy.
Abstract The Paracatu deposit in Brazil is a shallowly dipping, bulk-tonnage, low-grade, vein-style orogenic Au orebody hosted in very strongly deformed Neoproterozoic carbonaceous phyllite of the southern Brasília fold belt. At regional to district scales, the gold orebody lies along the eastern, hanging-wall edge of a major thrust of the ~630 Ma Brasiliano orogeny. This thrust cuts through a facies transition between clastic-dominated rocks of the Canastra Group and carbonate-dominant rocks of the Vazante Group, deposited at ~1000 Ma in a rift to passive-margin environment on the flank of the São Francisco craton. At the same scales, the footwall of this major thrust system hosts numerous structurally controlled zinc deposits including Vazante and Morro Agudo. At Paracatu, ore genesis occurred primarily by the formation of early tectonic quartz sulfide-carbonate veins, prior to substantial ductile deformation (boudinage), local physico-chemical reworking of these veins, and redistribution of some gold. Structural, geochemical, and isotopic data indicate a strong influence of the local rocks (cm to 100-m scales) on many ore ingredients, and the quartz and carbonate in ore veins were most likely derived locally (cm to m scales). However, the coassociation of gold and arsenic with the boudinaged veins and a major thrust, and the absence of metal enrichments normally associated with syngenetic metalliferous black shales, supports a model of far-field derivation of gold within this metasedimentary package (km to 10-km scales). Transport of metal-bearing fluids toward a favorable structural and chemical site during thrusting and orogenesis was possibly focused, during precipitation to ore grades, by the position of transverse structures in the basement, which also influenced deposition of the adjacent zinc deposits. Successful mining of the low-grade resource was initially favored by the subhorizontal orebody geometry and weathering characteristics, and subsequently by high production rates from the 100-m-thick mineralized zone.