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Статті в журналах з теми "Lower Gawler Range Volcanics"
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Wade, C. E., J. L. Payne, K. Barovich, S. Gilbert, B. P. Wade, J. L. Crowley, A. Reid, and E. A. Jagodzinski. "ZIRCON TRACE ELEMENT GEOCHEMISTRY AS AN INDICATOR OF MAGMA FERTILITY IN IRON OXIDE COPPER-GOLD PROVINCES." Economic Geology 117, no. 3 (May 1, 2022): 703–18. http://dx.doi.org/10.5382/econgeo.4886.
Повний текст джерелаАнотація:
Abstract Extrusive and intrusive felsic magmas occur throughout the evolution of silicic-dominated large igneous province magmatism that is temporally related to numerous economically significant iron oxide copper-gold (IOCG) deposits in southern Australia. We investigate zircon trace element signatures of the felsic magmas to assess whether zircon composition can be related to fertility of the volcanic and intrusive suites within IOCG-hosted mineral provinces. Consistent with zircon forming in oxidizing magmatic conditions, the rare earth element (REE) patterns of zircon sourced from both extrusive and intrusive magmatic rocks are characterized by light REE depletions and a range of positive Ce and negative Eu anomalies. The timing of the major phase of IOCG mineralization overlaps with the early part of the first phase of Lower Gawler Range Volcanics magmatism (1593.6–1590.4 Ma) and older intrusive magmatism of the Hiltaba Suite (1593.06–1590.50 Ma). Zircon in these mineralization-related intrusives and extrusives is distinguished from zircon in younger, mineralization-absent rocks by higher Eu/Eu*, Ce/Ce*, and Ti values and separate magma evolution paths with respect to Hf. These zircon characteristics correspond to lower degrees of fractionation and/or crustal assimilation, more oxidizing magmatic conditions, and higher magmatic temperatures, respectively, in magmas coeval with mineralization. In this respect, we consider higher oxidation state, lower degrees of fractionation, and higher magmatic temperatures to be features of fertile magmas in southern Australian IOCG terrains. Similar zircon REE characteristics are shared between magmas associated with southern Australian IOCG and iron oxide-apatite (IOA) rhyolites from the St. Francois Mountains, Missouri, namely high Ce/Ce* and high Dy/Yb, indicative of oxidized and dry magmas, respectively. The dry and more fractionated nature of the IOCG- and IOA-associated magmas contrasts with the hydrous and unfractionated nature of fertile porphyry Cu deposit magmas. As indicated by high Ce/Ce* ratios, the oxidized nature is considered a key element in magma fertility in IOCG-IOA terrains. In both IOCG and IOA terrains, the trace element compositions of zircon are able to broadly differentiate fertile from nonfertile magmatic rocks.
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GILES, C. "Petrogenesis of the Proterozoic Gawler Range Volcanics, South Australia." Precambrian Research 40-41 (October 1988): 407–27. http://dx.doi.org/10.1016/0301-9268(88)90078-2.
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Morrow, Nicole, and Jocelyn McPhie. "Mingled silicic lavas in the Mesoproterozoic Gawler Range Volcanics, South Australia." Journal of Volcanology and Geothermal Research 96, no. 1-2 (February 2000): 1–13. http://dx.doi.org/10.1016/s0377-0273(99)00143-2.
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Fraser, G. L., R. G. Skirrow, and A. R. Budd. "Geochronology of Mesoproterozoic gold mineralization in the Gawler Craton, and temporal links with the Gawler Range Volcanics." Geochimica et Cosmochimica Acta 70, no. 18 (August 2006): A185. http://dx.doi.org/10.1016/j.gca.2006.06.371.
Повний текст джерела
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Kivior, Irena, Stephen Markham, Leslie Mellon, and David Boyd. "Mapping geology beneath volcanics using magnetic data." APPEA Journal 58, no. 2 (2018): 821. http://dx.doi.org/10.1071/aj17205.
Повний текст джерелаАнотація:
Volcanic layers within sedimentary basins cause significant problems for petroleum exploration because the attenuation of the seismic signal masks the underlying geology. A test study was conducted for the South Australia Government to map the thickness of volcanics and sub-volcanic geology over a large area in the Gawler Range Volcanics province. The area is covered by good quality magnetic data. The thickness of volcanics and basement configuration was unknown as there has only been a limited amount of drilling. The Automatic Curve Matching (ACM) method was applied to located magnetic data and detected magnetic sources within different rock units, providing their depth, location, geometry and magnetic susceptibility. The magnetic susceptibilities detected by ACM allowed the differentiation of the volcanics and the underlying basement. The base of volcanics and the depth to the top of basement was mapped along 75 km NS profiles, that were spaced 1 km apart over a distance of 220 km. The volcanic and basement magnetic susceptibilities and the magnetic source distribution pattern were used as key determinants to interpret the depth to the two interfaces. The results for each interface were gridded, and images of the base of volcanics and depth to basement were generated. The mapped volcanics thickness was validated by comparison with the results from drilling, with the volcanics thickness matching very well. After project completion, a passive seismic survey was conducted in part of the test area, indicating a base of volcanics of ~4 km, which further confirmed the results.
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Agangi, Andrea, Jocelyn McPhie, and Vadim S. Kamenetsky. "Magma chamber dynamics in a silicic LIP revealed by quartz: The Mesoproterozoic Gawler Range Volcanics." Lithos 126, no. 1-2 (September 2011): 68–83. http://dx.doi.org/10.1016/j.lithos.2011.06.005.
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Pankhurst, M. J., B. F. Schaefer, P. G. Betts, N. Phillips, and M. Hand. "A mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan." Solid Earth Discussions 2, no. 2 (September 9, 2010): 251–74. http://dx.doi.org/10.5194/sed-2-251-2010.
Повний текст джерелаАнотація:
Abstract. Rhyolite and dacite lavas of the Mesoproterozoic upper Gawler Range Volcanics (GRV) (>30 000 km3 preserved), South Australia, represent the remnants of one of the most voluminous felsic magmatic events preserved on Earth. Geophysical interpretation suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows >100 km in length. Pigeonite inversion thermometers indicate eruption temperatures of 950–1100 °C. The lavas are A-type in composition (e.g. high Ga/Al ratios) and characterised by elevated primary halogen concentrations (~1600 ppm Fluorine, ~400 ppm Chlorine). These depolymerised the magma such that temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests they had viscosities of <3.5 log η (Pa s). These physicochemical properties have led to the emplacement of a Large Rhyolite Province, which has affinities in emplacement style to Large Basaltic Provinces. The low viscosity of these felsic magmas has produced a unique igneous system on a scale which is either not present or poorly preserved elsewhere on the planet. The Gawler Range Volcanic Province represents the erupted portion of the felsic end member of the family of voluminous, rapidly emplaced terrestrial magmatic provinces.
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Pankhurst, M. J., B. F. Schaefer, P. G. Betts, N. Phillips, and M. Hand. "A Mesoproterozoic continental flood rhyolite province, the Gawler Ranges, Australia: the end member example of the Large Igneous Province clan." Solid Earth 2, no. 1 (March 31, 2011): 25–33. http://dx.doi.org/10.5194/se-2-25-2011.
Повний текст джерелаАнотація:
Abstract. Rhyolite and dacite lavas of the Mesoproterozoic upper Gawler Range Volcanics (GRV) (>30 000 km3 preserved), South Australia, represent the remnants of one of the most voluminous felsic magmatic events preserved on Earth. Geophysical interpretation suggests eruption from a central cluster of feeder vents which supplied large-scale lobate flows >100 km in length. Pigeonite inversion thermometers indicate eruption temperatures of 950–1100 °C. The lavas are A-type in composition (e.g. high Ga/Al ratios) and characterised by elevated primary halogen concentrations (~1600 ppm fluorine, ~400 ppm chlorine). These depolymerised the magma such that temperature-composition-volatile non-Arrhenian melt viscosity modelling suggests they had viscosities of <3.5 log η (Pa s). These physicochemical properties have led to the emplacement of a Large Rhyolite Province, which has affinities in emplacement style to Large Basaltic Provinces. The low viscosity of these felsic magmas has produced a unique igneous system on a scale which is either not present or poorly preserved elsewhere on the planet. The Gawler Range Volcanic Province represents the erupted portion of the felsic end member of the family of voluminous, rapidly emplaced terrestrial magmatic provinces.
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McPhie, J., F. DellaPasqua, S. R. Allen, and M. A. Lackie. "Extreme effusive eruptions: Palaeoflow data on an extensive felsic lava in the Mesoproterozoic Gawler Range Volcanics." Journal of Volcanology and Geothermal Research 172, no. 1-2 (May 2008): 148–61. http://dx.doi.org/10.1016/j.jvolgeores.2006.11.011.
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Chapman, N. D., M. Ferguson, S. J. Meffre, A. Stepanov, R. Maas, and K. J. Ehrig. "Pb-isotopic constraints on the source of A-type Suites: Insights from the Hiltaba Suite - Gawler Range Volcanics Magmatic Event, Gawler Craton, South Australia." Lithos 346-347 (November 2019): 105156. http://dx.doi.org/10.1016/j.lithos.2019.105156.
Повний текст джерелаДисертації з теми "Lower Gawler Range Volcanics"
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Ross, A. "Physical volcanology and geochemistry of the lower Gawler Range Volcanics in the southern Gawler Ranges." Thesis, 2015. http://hdl.handle.net/2440/118236.
Повний текст джерелаАнотація:
This item is only available electronically.The Gawler Range Volcanics are a Silicic Large Igneous Province that has been extensively studied due to the atypical nature of its widespread felsic lava flows. These low viscosity lavas form the upper sequence of the GRV, termed the Upper Gawler Range Volcanics (UGRV). The older sequence or Lower Gawler Range Volcanics (LGRV) are readily distinguished from the UGRV as they appear as numerous discrete volcanic centres, the best exposed of which are at Kokatha and Lake Everard. A much less discussed volcanic area of the LGRV are the Southern Gawler Ranges Area Volcanics (SGRAV), which form a curvilinear belt along the southern margin of the GRV. The SGRAV are dominantly represented by two volcanic units, the Bittali Rhyolite (BR) and Waganny Dacite (WD) which are exposed discontinuously for ~200km E-W. The SGRAV may be divided into a western section of dominantly effusive volcanism, with elevated temperatures and halogen contents comparable to that of the UGRV, and a central-eastern section where explosive volcanism predominates. Petrogenetic modelling suggests that assimilation fractional crystallization (AFC) processes which played a role in the development of the LGRV, were active in the formation of the SGRAV. However, using AFC modelling, the SGRAV can be reconstructed through a dominant fractional crystallization process with late stage crustal assimilation, as opposed to continual crustal assimilation in the other LGRV magma systems.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015
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Tregeagle, J.-S. "Petrogenesis and magma chamber evolution of the Gawler Range Volcanics." Thesis, 2014. http://hdl.handle.net/2440/110564.
Повний текст джерелаАнотація:
This item is only available electronically.The Gawler Range Volcanics (GRV) have been extensively studied previously, but a source and emplacement mechanism has yet to be agreed upon. This study aims to constrain the source region of the GRV and to make deductions about how the GRV evolved. This has been done through a number of modelling techniques, including AFC modelling and use of the Rhyolite-MELTs program. The εNd values vary widely across the GRV, and these have been used in conjunction with trace element geochemistry to constrain the source region. It is deduced that the most primitive GRV basalts were the result of limited fractionation of a re-enriched refractory harzburgite source in the sub-continental lithospheric mantle. It is then shown that the entire GRV suite can be derived from one fractionation trend, however some assimilation is required.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2014
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Hill, J. "Geochemical evolution and alteration styles within the Gawler Range Volcanics, South Australia." Thesis, 2019. https://hdl.handle.net/2440/136960.
Повний текст джерелаАнотація:
This item is only available electronically.The Gawler Range Volcanics (GRV) form part of a Mesoproterozoic Silicic Large Igneous Province (Gawler SLIP) within South Australia. The SLIP includes intrusive and extrusive rocks within the Gawler Craton and Curnamona Province that are dominantly felsic. Recent high precision dating of several GRV units has shown that they erupted between 1587 Ma and 1595 Ma allowing for geochemical comparisons with respect to a precise timeline. Trace element geochemistry has shown anomalies to be consistent through the lower and upper GRV demonstrating the main source in the GRV likely did not change. A mafic component is shown to have contributed to both the lower and upper GRV system. Eu anomalies and trace element geochemistry shows that there was a large change in magmatic evolution between the upper and lower GRV within a short time (<1 m.yr). This change is hypothesised to have occurred due to the tectonic regime during the SLIP emplacement. Hydrothermal alteration associated with the emplacement of the Gawler SLIP is known to have contributed to the formation of Iron-Oxide Copper-Gold (IOCG) and shear-hosted deposits in South Australia. More recent discoveries within the Southern Gawler Ranges display epithermal-porphyry characteristics associated with alteration in the lower GRV. Alteration within the GRV is hereby characterised in order to identify alteration associated with mineralisation. Alteration is shown to encompass a sericite – hematite dominated assemblage which has affected most of the GRV. Several other anomalous alteration assemblages exist in localised areas. Using direct evidence, it is suggested that epithermal-porphyry systems may be preserved within the upper GRV, which encompasses a larger outcrop area than the lower GRV which is underexplored.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2019
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Budd, Anthony. "The Tarcoola Goldfield of the Central Gawler Gold Province, and the Hiltaba Association Granites, Gawler Craton, South Australia." Phd thesis, 2006. http://hdl.handle.net/1885/12890.
Повний текст джерелаАнотація:
The Tarcoola Goldfield, central South Australia, is one of a number within the Central Gawler Gold Province (CGGP) spatially related to Hiltaba Suite granites. This study investigates the origin of mineralisation at Tarcoola, and the petrogenesis of granites at and around Tarcoola.
‘Hiltaba Suite’ granites in the Tarcoola region are assigned to two supersuites, which is expanded to four once granites from the rest of the Gawler Craton are considered. The term Hiltaba Association Granites (HAG) is introduced as the parental unit of the Jenners, Malbooma, Venus and Roxby Supersuites. These criteria are applied to the felsic parts of the comagmatic Gawler Range Volcanics (GRV). The HAG and GRV are grouped as the bimodal Gawler Ranges–Hiltaba Volcano–Plutonic (GRHVP) Association. The felsic components generally have high K, HFSE, LIL, are fractionated and evolved, have moderate to high Fe/Mg, are slightly alkaline, metaluminous to slightly peraluminous, slightly oxidised and high-temperature.
The supersuites of the Tarcoola region are the Malbooma Supersuite, which is more strongly evolved and fractionated than the Jenners Supersuite. Both Supersuites are I-type and evolved from a granodiorite composition by fractional crystallisation. The Pegler and Ambrosia Granites (Jenners Supersuite), and are dated at 1591.7 ± 5.8 and 1575.4 ± 7.8 Ma. The Big Tank, Kychering and Partridge Granites (Malbooma Supersuite), and are dated at 1589.9 ± 7.4, 1574.7 ± 4.3 and 1577 ± 8.5 Ma.
The Roxby and Venus Supersuites are A-type granites and volcanics, with higher HFSE, F, and zircon saturation temperatures than the I-types. Nd-isotope data indicate that the felsic GRHVP formed by mixing between evolved mantle and crust.
Narrow dykes of the high-K Lady Jane Diorite intrude the Tarcoola Goldfield. This unit, and other basalts of the GRHVP, are interpreted to represent mixing between evolved lithospheric and primitive asthenospheric mantle melts.
The Paxton Granite at the Tarcoola Goldfield was dated as older than the HAG at ~1720 Ma. The Tarcoola Formation was deposited in an ensialic basin directly onto the Paxton, with the basal Peela Conglomerate Member contains zircons of 1732.8 ± 5.1 Ma and 1714.6 ± 7.9 Ma, and the middle parts of the Tarcoola Formation being deposited at 1656 ± 7 Ma.
Mineralisation at the Tarcoola Goldfield is quartz-vein hosted within the Tarcoola Formation, and comprises Au±Pb-Zn. The veins are structurally-controlled. 40Ar/39Ar geochronology and field relationships show that brittle veining, mineralisation, alteration and intrusion of the Lady Jane Diorite, occurred synchronously at ~1580 Ma.
A Pb-Pb isotope study at the Tarcoola Goldfield is consistent with sourcing of Pb from the Paxton Granite, but does not exclude a mixed source. A shift in Nd during alteration may show an input from the relatively primitive Lady Jane Diorite.
An atlas shows correlations between the four supersuites and the two defined mineral provinces of the Gawler Craton. Notably the Roxby Supersuite is associated nearly exclusive with iron-oxide copper-gold mineralisation in the Olympic Cu-Au Province in the eastern part of the Craton. The I-type Jenners and Malbooma Supersuites are mostly restricted to the CGGP. A position inboard of a subduction zone (hot continental back-arc) rather than anorogenic setting is proposed.
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Jagodzinski, E. "The geology of the Gawler Range Volcanics in the Toondulya Bluff area and U-Pb dating of the Yardea Dacite at Lake Acraman." Thesis, 1985. http://hdl.handle.net/2440/86564.
Повний текст джерелаАнотація:
This item is only available electronically.At Toondulya Bluff a sequence of 'older' Gawler Range Volcanics dip in an easterly direction beneath the overlying Yardea Dacite, and are intruded by the comagmatic Hiltaba Granite. The volcanics occur as a series of tuffs and lava flows. Geochemical evidence suggests these volcanics are related to each other by fractional crystallisation, with plagioclase, clinopyroxene, K-feldspar and titan-magnetite, and accessory zircon and apatite controlling differentiation trends. The Si-rich Hiltaba Granite and Yardea Dacite formed from the final, highly fractionated melts. Geothermometry suggests the volcanic and granite crystallised at temperatures within the range 680deg-850degC. The initial magma from which the lithologies were derived, was formed by partial melting of a lower crustal source probably of granulitic composition. Lake Acraman is believed to have been a site of meteoritic impact in the late Proterozoic (~600 Ma ago). Fragments of dacitic ejecta have been identified within the Bunyeroo Formation, Flinders Ranges and dating of these fragments gives an age of c.1575 Ma using single zircon ion probe dating techniques (Gostin et al in prep.). U/Pb dating of the Yardea Dacite at Lake Acraman reveals it to be of comparable age to these fragments (1603-1631 Ma). The lower intercept of the discordia line reveals there has been no resetting of the U/Pb system in response to the postulated meteoritic impact.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Earth and Environmental Sciences, 1985
Частини книг з теми "Lower Gawler Range Volcanics"
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Welch, J. L., B. Z. Foreman, D. Malone, and J. Craddock. "Provenance of early Paleogene strata in the Bighorn Basin (Wyoming, USA): Implications for Laramide tectonism and basin-scale stratigraphic patterns." In Tectonic Evolution of the Sevier-Laramide Hinterland, Thrust Belt, and Foreland, and Postorogenic Slab Rollback (180–20 Ma). Geological Society of America, 2022. http://dx.doi.org/10.1130/2022.2555(09).
Повний текст джерелаАнотація:
ABSTRACT The Bighorn Basin (Wyoming, USA) contains some of the most extensively exposed and studied nonmarine early Paleogene strata in the world. Over a century of research has produced a highly resolved record of early Paleogene terrestrial climatic and biotic change as well as extensive documentation of spatiotemporal variability in basin-scale stratigraphy. The basin also offers the opportunity to integrate these data with the uplift and erosional history of the adjacent Laramide ranges. Herein, we provide a comprehensive provenance analysis of the early Paleogene Fort Union and Willwood Formations in the Bighorn Basin from paleocurrent measurements (n > 550 measurements), sandstone compositions (n = 76 thin sections), and U-Pb detrital zircon geochronology (n = 2631 new and compiled age determinations) obtained from fluvial sand bodies distributed widely across the basin. Broadly, we observed data consistent with (1) erosion of Mesozoic strata from the Bighorn and Owl Creek Mountains and transport into the eastern and southern basin; (2) erosion of Paleozoic sedimentary cover and crystalline basement from the Beartooth Mountains eastward into the northern Bighorn Basin; (3) conglomeratic fluxes of sediment from the Teton Range or Sevier fold-and-thrust belt to the southwestern Bighorn Basin; and (4) potential sediment provision to the basin via the Absaroka Basin that was ultimately derived from more distal sources in the Tobacco Root Mountains and Madison Range. Similar to previous studies, we found evidence for a system of transverse rivers contributing water and sediment to an axial river system that drained north into southern Montana during both the Paleocene and Eocene. Within our paleodrainage and provenance reconstruction, the basin-scale patterns in stratigraphy within the Fort Union and Willwood Formations appear to have been largely driven by catchment size and the lithologies eroded from the associated highlands. Mudrock-dominated strata in the eastern and southeastern Bighorn Basin were caused by comparably smaller catchment areas and the finer-grained siliciclastic strata eroded from nearby ranges. The conglomeratic and sand-dominated strata of the southwestern area of the Bighorn Basin were caused by large, braided fluvial systems with catchments that extended into the Sevier thrust belt, where more resistant source lithologies, including Neoproterozoic quartzites, were eroded. The northernmost early Paleogene strata represent the coalescence of these fluvial systems as well as rivers and catchments that extended into southwestern Montana that contained more resistant, crystalline lithologies. These factors generated the thick, laterally extensive fluvial sand bodies common in that area of the basin. When combined with provenance patterns in adjacent Laramide basins, our data indicate asymmetric unroofing histories on either side of the Bighorn and Owl Creek Mountains. The Powder River Basin to the east of the Bighorn Mountains displays a clear Precambrian crystalline provenance, and the Wind River Basin to the south of the Owl Creek Mountains displays provenance similarities to Lower Paleozoic strata, in contrast to provenance in the Bighorn Basin, which indicates less substantial unroofing. We infer that the differing unroofing histories are due to the dominant vergence direction of the underlying basement reverse faults. Overall, this provenance pattern persisted until ca. 50 Ma, when more proximal igneous and volcaniclastic units associated with the Absaroka and Challis volcanics became major sediment sources and the Idaho River system became the dominant transport system in the area.