Статті в журналах з теми "Mount Isa Group stratigraphy"

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1

Simpson, Edward L., and Kenneth A. Eriksson. "Thin eolianites interbedded within a fluvial and marine succession: early proterozoic whitworth formation, mount isa inlier, australia." Sedimentary Geology 87, no. 1-2 (September 1993): 39–62. http://dx.doi.org/10.1016/0037-0738(93)90035-4.

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2

Stewart, Alastair J. "Extensional faulting as the explanation for the Deighton ‘Klippe’ and other Mount Albert Group outliers, Mount Isa Inlier, northwestern Queensland." Australian Journal of Earth Sciences 36, no. 3 (September 1989): 405–21. http://dx.doi.org/10.1080/08120098908729497.

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3

JACKSON, M. J., E. L. SIMPSON, and K. A. ERIKSSON. "Facies and sequence stratigraphic analysis in an intracratonic, thermal-relaxation basin: the Early Proterozoic, Lower Quilalar Formation and Ballara Quartzite, Mount Isa Inlier, Australia." Sedimentology 37, no. 6 (December 1990): 1053–78. http://dx.doi.org/10.1111/j.1365-3091.1990.tb01846.x.

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4

Busch, James F., Alan D. Rooney, Edward E. Meyer, Caleb F. Town, David P. Moynihan, and Justin V. Strauss. "Late Neoproterozoic – early Paleozoic basin evolution in the Coal Creek inlier of Yukon, Canada: implications for the tectonic evolution of northwestern Laurentia." Canadian Journal of Earth Sciences 58, no. 4 (April 2021): 355–77. http://dx.doi.org/10.1139/cjes-2020-0132.

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The age and nature of the Neoproterozoic – early Paleozoic rift–drift transition has been interpreted differently along the length of the North American Cordillera. The Ediacaran “upper” group (herein elevated to the Rackla Group) of the Coal Creek inlier, Yukon, Canada, represents a key succession to reconstruct the sedimentation history of northwestern Laurentia across the Precambrian–Cambrian boundary and elucidate the timing of active tectonism during the protracted breakup of the supercontinent Rodinia. These previously undifferentiated late Neoproterozoic – early Paleozoic map units in the Coal Creek inlier are herein formally defined as the Lone, Cliff Creek, Mount Ina, Last Chance, Shade, and Shell Creek formations. New sedimentological and stratigraphic data from these units is used to reconstruct the depositional setting. In the Last Chance Formation, chemostratigraphic observations indicate a ca. 5‰ δ13Ccarb gradient coincident with the globally recognized ca. 574–567 Ma Shuram carbon isotope excursion. Map and stratigraphic relationships in the overlying Shell Creek Formation provide evidence for latest Ediacaran – middle Cambrian tilting and rift-related sedimentation. This provides evidence for active extension through the Cambrian Miaolingian Series in northwestern Canada, supporting arguments for a multiphase and protracted breakup of Rodinia.
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5

HUNTER, M. A., T. R. RILEY, D. J. CANTRILL, M. J. FLOWERDEW, and I. L. MILLAR. "A new stratigraphy for the Latady Basin, Antarctic Peninsula: Part 1, Ellsworth Land Volcanic Group." Geological Magazine 143, no. 6 (September 28, 2006): 777–96. http://dx.doi.org/10.1017/s0016756806002597.

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The Jurassic Mount Poster Formation of eastern Ellsworth Land, southern Antarctic Peninsula, comprises silicic ignimbrites related to intracontinental rifting of Gondwana. The identification of less voluminous basaltic and sedimentary facies marginal to the silicic deposits has led to a reclassification of the volcanic units into the Ellsworth Land Volcanic Group. This is formally subdivided into two formations: the Mount Poster Formation (silicic ignimbrites), and the Sweeney Formation (basaltic and sedimentary facies). The Mount Poster Formation rhyolites are an intracaldera sequence greater than 1 km in thickness. The basaltic and sedimentary facies of the Sweeney Formation are consistent with deposition in a terrestrial setting into, or close to, water. The geochemistry of the Mount Poster Formation is consistent with derivation of the intracaldera rhyolites from a long-lived, upper crustal magma chamber. The basalts of the Sweeney Formation are intermediate between asthenosphere- and lithosphere-derived magmas, with little or no subduction-modified component. The basalt could represent a rare erupted part of the basaltic underplate that acted as the heat source for local generation of the rhyolites. U–Pb ion microprobe zircon geochronology of samples from the Mount Poster Formation yield an average eruption age of 183.4±1.4 Ma. Analysis of detrital zircons from a Sweeney Formation sandstone suggest a maximum age of deposition of 183±4 Ma and the two formations are considered coeval. In addition, these ages are coincident with eruption of the Karoo-Ferrar Igneous Province in southern Africa and East Antarctica. Our interpretation of the Ellsworth Land Volcanic Group is consistent with the model that the Jurassic volcanism of Patagonia and the Antarctic Peninsula took place in response to intracontinental extension driven by arrival of a plume in that area.
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6

McConachie, Bruce A., and John N. Dunster. "Sequence stratigraphy of the Bowthorn block in the northern Mount Isa basin, Australia: Implications for the base-metal mineralization process." Geology 24, no. 2 (1996): 155. http://dx.doi.org/10.1130/0091-7613(1996)024<0155:ssotbb>2.3.co;2.

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7

Foit Jr., Franklin F., Peter J. Mehringer Jr., and John C. Sheppard. "Age, distribution, and stratigraphy of Glacier Peak tephra in eastern Washington and western Montana, United States." Canadian Journal of Earth Sciences 30, no. 3 (March 1, 1993): 535–52. http://dx.doi.org/10.1139/e93-042.

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Tephra layers from Williams Lake Fen, Wildcat Lake, and East Wenatchee, Washington, and Kearns Basin, Lost Trail Pass, Sheep Mountain Bog, and Marys Frog Pond, Montana, were analyzed by electron microprobe (EMP), and associated lake deposits were radiocarbon dated. Though the tephra layers can be grouped by source (Glacier Peak, Mount Mazama, Mount Saint Helens, and unknown source), statistical analyses of both glass and mineral compositions show that finer distinctions within a group (for example, Glacier Peak B, M, and G) cannot be made on the basis of chemical data obtained using conventional EMP techniques. It appears that more-sensitive analytical techniques may be needed to discriminate among the Glacier Peak tephras. Tephra stratigraphy at the various sites reveals a potentially greater complexity in Glacier Peak tephra distributions and ages than was anticipated. All sites, except Sheep Mountain Bog and East Wenatchee, contained two Glacier Peak tephras. Taken as a whole the Glacier Peak tephra layers may record closely timed, multiple eruptions with restricted ash falls as well as widespread tephra from large eruptions. Radiocarbon dating generally confirms a 14C age of 11 200 years BP for a distal Glacier Peak couplet(s) that occurs, stratigraphically, both above and below Mount Saint Helens J tephra in east-central Washington.
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8

Bradshaw, B. E., J. F. Lindsay, A. A. Krassay, and A. T. Wells. "Attenuated basin‐margin sequence stratigraphy of the Palaeoproterozoic Calvert and Isa Superbasins: The Fickling Group, southern Murphy Inlier, Queensland." Australian Journal of Earth Sciences 47, no. 3 (June 2000): 599–623. http://dx.doi.org/10.1046/j.1440-0952.2000.00794.x.

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9

McCUTCHEON, S. R., H. E. ANDERSON, and P. T. ROBINSON. "Stratigraphy and eruptive history of the Late Devonian Mount Pleasant Caldera Complex, Canadian Appalachians." Geological Magazine 134, no. 1 (January 1997): 17–36. http://dx.doi.org/10.1017/s0016756897006213.

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Stratigraphic, petrographic and geochemical evidence indicate that the volcano-sedimentary rocks of the Late Devonian Piskahegan Group, located in the northern Appalachians of southwestern New Brunswick, represent the eroded remnants of a large epicontinental caldera complex. This complex – the Mount Pleasant Caldera – is one of few recognizable pre-Cenozoic calderas and is divisible into Exocaldera, Intracaldera and Late Caldera-Fill sequences. The Intracaldera Sequence comprises four formations that crop out in a triangular-shaped area and includes: thick ash flow tuffs, thick sedimentary breccias that dip inward, and stocks of intermediate to felsic composition that intrude the volcanic pile or are localized along caldera-margin faults. The Exocaldera Sequence contains ash flow tuffs, mafic lavas, alluvial redbeds and porphyritic felsic lavas that comprise five formations. The Late Caldera-Fill Sequence contains rocks that are similar to those of the outflow facies and comprises two formations and two minor intrusive units. Geochemical and mineralogical data support the stratigraphic subdivision and indicate that the basaltic rocks are mantle-derived and have intraplate chemical affinities. The andesites were probably derived from basaltic magma by fractional crystallization and assimilation of crustal material. The various felsic units are related by episodes of fractional crystallization in a high-level, zoned magma chamber. Fractionation was repeatedly interrupted by eruption of material from the roof zone such that seven stages of caldera development have been identified. The genesis of the caldera is related to a period of lithospheric thinning that followed the Acadian Orogeny in the northern Appalachians.
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10

Arsan, Andrew Kerim. "Roots and Routes: The Paths of Lebanese Migration to French West Africa." Chronos 22 (April 7, 2019): 107–38. http://dx.doi.org/10.31377/chr.v22i0.451.

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We have no way of knowing when the first migrant from present-day Lebanon arrived in West Africa. Some amongst the Lebanese of Dakar still clung in the 1960s to tales ofa man, known only by his first name — 'Isa — who had landed in Senegal a century earlier (Cruise O'Brien 1975: 98). Others told ofa group of young men — Maronite Christians from the craggy escarpments of Mount Lebanon — who had found their way to West Africa some time between 1876 and 1880 (Winder 1962:30()). The Lebanese journalist 'Abdallah Hushaimah, travelling through the region in the 1930s, met in Nigeria one Elias al-Khuri, who claimed to have arrived in the colony in 1890 (Hushaimah 1931:332). The Dutch scholar Laurens van der Laan, combing in the late 1960s through old newspapers in the reading rooms of Fourah Bay College in Freetown, found the first mention of the Lebanese in the Creole press of Sierra Leone in 1895 (van der Laan 1975: l).
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11

Reis, Nelson Joaquim, Serge Nadeau, Leda Maria Fraga, Leandro Menezes Betiollo, Maria Telma Lins Faraco, Jimmy Reece, Deokumar Lachhman, and Randy Ault. "Stratigraphy of the Roraima Supergroup along the Brazil-Guyana border in the Guiana shield, Northern Amazonian Craton - results of the Brazil-Guyana Geology and Geodiversity Mapping Project." Brazilian Journal of Geology 47, no. 1 (January 2017): 43–57. http://dx.doi.org/10.1590/2317-4889201720160139.

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ABSTRACT: The Geological and Geodiversity Mapping binational program along the Brazil-Guyana border zone allowed reviewing and integrating the stratigraphy and nomenclature of the Roraima Supergroup along the Pakaraima Sedimentary Block present in northeastern Brazil and western Guyana. The area mapped corresponds to a buffer zone of approximately 25 km in width on both sides of the border, of a region extending along the Maú-Ireng River between Mount Roraima (the triple-border region) and Mutum Village in Brazil and Monkey Mountain in Guyana. The south border of the Roraima basin is overlain exclusively by effusive and volcaniclastic rocks of the Surumu Group of Brazil and its correlated equivalent the Burro-Burro Group of Guyana.
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12

HUNTER, M. A., and D. J. CANTRILL. "A new stratigraphy for the Latady Basin, Antarctic Peninsula: Part 2, Latady Group and basin evolution." Geological Magazine 143, no. 6 (September 28, 2006): 797–819. http://dx.doi.org/10.1017/s0016756806002603.

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Recent detailed mapping, section logging and an improved understanding of the geological evolution of the Antarctic Peninsula provide a robust framework for an improved lithostratigraphic subdivision of the Latady Basin, eastern Ellsworth Land. Within the Latady Basin we recognize two main groups: Ellsworth Land Volcanic Group and Latady Group. The focus of this paper is the Latady Group, which is formally subdivided into five formations: Anderson Formation, Witte Formation, Hauberg Mountains Formation, Cape Zumberge Formation and Nordsim Formation. Middle Jurassic, shallow marine deposits of the Anderson Formation are overlain by quiet anoxic deposits assigned to the Witte Formation. The start of the Late Jurassic is marked by the deposition of higher energy deposits of the Hauberg Mountains Formation, subdivided into three members (Long Ridge, Mount Hirman and Novocin members) that reflect varying lithological and environmental characteristics. Thermal subsidence during the latest Jurassic led to deposition of the basinal Cape Zumberge Formation, while uplift of an active continental arc along the Antarctic Peninsula led to deposition of the terrestrial Nordsim Formation in the latest Jurassic to earliest Cretaceous. The evolution of the Latady Basin reflects early extension during Gondwana break-up, from the Early Jurassic to earliest Cretaceous, and is consistent with a shift in the underlying forces driving extension in the Weddell Sea area from intracontinental rifting related to a mantle plume, to active margin forces in response to subduction.
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13

Wilde, Andy. "Shear-Hosted Uranium Deposits: A Review." Minerals 10, no. 11 (October 26, 2020): 954. http://dx.doi.org/10.3390/min10110954.

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A group of uranium deposits is described that is hosted within polyphase shear zones. The group is economically significant, collectively containing over 500,000 tonnes of uranium and several examples have been or are being mined. Over a hundred individual deposits are known widely spread over many countries. It is proposed that this group be assigned to a new shear-hosted uranium deposit category. Uranium deposition was superimposed upon intense and extensive feldspathic alteration formed during ductile deformation. This intense alteration has led to the alternative albitite-type or metasomatite-type nomenclature. The evidence is clear that in most cases uranium mineralization postdates regionally extensive feldspar alteration and is associated with a range of alteration assemblages which overprint early albite or K-feldspar dominant alteration. Abundance of hydrothermal zirconium and phosphate minerals is a common characteristic of this group which implies high activity of F and P during mineralisation, but the source of hydrothermal fluids remains uncertain. Also uncertain is the geodynamic setting of uranium mineralisation which is a consequence of absolute mineralisation age being poorly defined. Data from three of the four major districts are suggestive that mineralisation was a consequence of fluid migration along shears during regional compression. This paper reviews key aspects of the group in a mineral systems context, focussing on the four major districts of Kropyvnytskyi (Ukraine), Lagoa Real (Brazil), Mount Isa (Australia) and the Central Mineral Belt (Canada).
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14

Ray, G. E., I. C. L. Webster, and G. L. Dawson. "The stratigraphy of the Nicola Group in the Hedley district, British Columbia, and the chemistry of its intrusions and Au skarns." Canadian Journal of Earth Sciences 33, no. 8 (August 1, 1996): 1105–26. http://dx.doi.org/10.1139/e96-084.

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The Nicola Group at Hedley, British Columbia, is a late Carnian to late Norian (Late Triassic) sequence of calcareous sedimentary and arc-related volcaniclastic rocks. It was deposited on a tectonically active paleoslope that marked either the rifted eastern margin of the shallow-marine Nicola basin or the faulted edge of an intrabasinal platform. The lower part of the Nicola Group comprises a succession of four essentially coeval sedimentary facies. From east to west across the district, these are informally named the thin (approx. 200 m), shallow-marine, limestone-dominant French Mine formation; the thicker, calcareous siltstone-dominant Hedley and Chuchuwayha formations in the central part of the district; and the thick (up to 2200 m), deeper water and argillite-dominant Stemwinder formation. These facies are all blanketed by the Whistle formation, a 1200 m thick unit of basaltic tuff and tuffaceous sediment whose base is marked by a gravity-slide megabreccia, the Copperfield breccia. The Nicola arc at Hedley was associated with two plutonic episodes. Oldest are the Hedley intrusions, which are related to economic Au skarns, including the Nickel Plate deposit, which has produced over 71 t of gold from 13.4 Mt of ore. The Hedley intrusions are similar in composition (quartz gabbro to quartz diorite) and overall metaluminous chemistry to other island-arc-generated plutons related to many Cu and Fe skarns in British Columbia, although they are less evolved. They also differ in having lower Fe2O3/FeO ratios (avg. 0.23), indicating a reduced oxidation state, and higher Ba/La and Sc/Nb ratios. A slightly younger plutonic episode produced the 193 Ma (Early Jurassic) Bromley batholith and the 194 Ma Mount Riordan stock; the latter is associated with the Mount Riordan (Crystal Peak) industrial garnet skarn. Gold skarns are preferentially developed in areas where the Hedley intrusions cut the Hedley and French Mine formations. The Au skarn ore is marked by anomalous As, Bi, Te, and Co values, and by high pyrrhotite/pyrite and pyroxene/garnet ratios. It is distinct from the ore of Fe, Cu, Mo, Pb–Zn, W, and Sn skarns by its very low Cu/Au, Zn/Au, and Ag/Au ratios (avg. 97, 18, and 12, respectively).
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15

Sav, Adem, Michelle A. King, Fiona Kelly, Sara S. McMillan, Elizabeth Kendall, Jennifer A. Whitty, and Amanda J. Wheeler. "Self-management of chronic conditions in a rural and remote context." Australian Journal of Primary Health 21, no. 1 (2015): 90. http://dx.doi.org/10.1071/py13084.

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Living in a rural or remote environment presents unique challenges for people with chronic conditions, mainly those created by limited health-care services and the physical and emotional isolation. Yet, research on how people self-manage their chronic conditions in such locations is limited. This study aims to contribute to research and clinical practice by describing the ways in which a diverse group of rural and remote people with a range of chronic conditions, and their unpaid carers, self-manage their conditions. Using semi-structured in-depth interviews, data was collected from a sample of 32 participants, residing in one of two regions of Australia: Mount Isa/North West region of Queensland and the Northern Rivers area of New South Wales. Our findings suggest that although self-managing in a rural and remote context requires many of the lifestyle changes necessary in urban areas, the uniqueness of the rural lifestyle and the limited availability of health care results in, at times, creative forms of self-management. Health-care professionals and policy makers need to be cognisant of the ways in which rural and remote residents modify self-management strategies to suit their needs, and help them develop self-management plans tailored to the realities of their rural environment.
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16

RILEY, TEAL R., MICHAEL J. FLOWERDEW, and MARTIN J. WHITEHOUSE. "Chrono- and lithostratigraphy of a Mesozoic–Tertiary fore- to intra-arc basin: Adelaide Island, Antarctic Peninsula." Geological Magazine 149, no. 5 (November 30, 2011): 768–82. http://dx.doi.org/10.1017/s0016756811001002.

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AbstractThe Mesozoic fore-arc of the Antarctic Peninsula is exposed along its west coast. On Adelaide Island, a 2–3 km succession of turbiditic coarse sandstones and volcanic rocks is exposed. Four U–Pb (zircon) ages are presented here that, in combination with a new stratigraphy, have permitted a robust chrono- and lithostratigraphy to be constructed, which in turn has allowed tentative correlations to be made with the Fossil Bluff Group of Alexander Island, where the ‘type’ fore-arc sequences are described. The lithostratigraphy of Adelaide Island includes the definition of five volcanic/sedimentary formations. The oldest formation is the Buchia Buttress Formation (149.5 ± 1.6 Ma) and is correlated with the Himalia Ridge Formation of Alexander Island. The sandstone–conglomerate dominated succession of the Milestone Bluff Formation (113.9 ± 1.2 Ma) is tentatively correlated with the Pluto Glacier Formation of Alexander Island. Three dominantly volcanic formations are recognized on Adelaide Island, akin to the volcanic rocks of the Alexander Island Volcanic Group; the Mount Liotard Formation is formed of 2 km of basaltic andesite lavas, whilst the Bond Nunatak Formation is also dominated by basaltic andesite lavas, but interbedded with volcaniclastic rocks. The Reptile Ridge Formation has been dated at 67.6 ± 0.7 Ma and is characterized by hydrothermally altered rhyolitic crystal-lithic tuffs. Tentative correlations between Adelaide Island and Alexander Island preclude the two areas forming part of distinct terranes as has been suggested previously, and a proximal source for volcaniclastic sediments also indicates an exotic terrane origin is unlikely.
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17

Carr, Lidena, Russell Korsch, Leonie Jones, and Josef Holzschuh. "The role of deep seismic reflection data in understanding the architecture and petroleum potential of Australia's onshore sedimentary basins." APPEA Journal 50, no. 2 (2010): 726. http://dx.doi.org/10.1071/aj09090.

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The onshore energy security program, funded by the Australian Government and conducted by Geoscience Australia, has acquired deep seismic reflection data across several frontier sedimentary basins to stimulate petroleum exploration in onshore Australia. Detailed interpretation of deep seismic reflection profiles from four onshore basins, focussing on overall basin geometry and internal sequence stratigraphy, will be presented here, with the aim of assessing the petroleum potential of the basins. At the southern end of the exposed part of the Mt Isa Province, northwest Queensland, a deep seismic line (06GA–M6) crosses the Burke River structural zone of the Georgina Basin. The basin here is >50 km wide, with a half graben geometry, and bounded in the west by a rift border fault. Given the overall architecture, this basin will be of interest for petroleum exploration. The Millungera Basin in northwest Queensland is completely covered by the thin Eromanga Basin and was unknown prior to being detected on two seismic lines (06GA–M4 and 06GA–M5) acquired in 2006. Following this, seismic line 07GA–IG1 imaged a 65 km wide section of the basin. The geometry of internal stratigraphic sequences and a post-depositional thrust margin indicate that the original succession was much thicker than preserved today and may have potential for a petroleum system. The Yathong Trough, in the southeast part of the Darling Basin in NSW, has been imaged in seismic line 08GA–RS2 and interpreted in detail using sequence stratigraphic principles, with several sequences being mapped. Previous studies indicate that the upper part of this basin consists of Devonian sedimentary rocks, with potential source rocks at depth. In eastern South Australia, seismic line 08GA–A1 crossed the Cambrian Arrowie Basin, which is underlain by a Neoproterozoic succession of the Adelaide Rift System. Stratigraphic sequences have been mapped and can be tied to recent drilling for mineral and geothermal exploration. Shallow drill holes from past petroleum exploration have aided the assessment of the petroleum potential of the Cambrian Hawker Group, which contains bitumen in the core, indicating the presence of source rocks in the basin system.
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