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Journal articles on the topic 'Geology, Structural Tasmania, Northern'

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Author: Grafiati

Published: 10 December 2022

Last updated: 28 January 2023

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1

Direen, N. G., and D. E. Leaman. "Geophysical Modelling of Structure and Tectonostratigraphic History of the Longford Basin, Northern Tasmania." Exploration Geophysics 28, no. 1-2 (March 1997): 29–33. http://dx.doi.org/10.1071/eg997029.

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2

Direen, N. G., and M. J. Roach. "Geophysical Indicators of Controls on Soil Salinisation and Implications, Longford Basin, Northern Tasmania." Exploration Geophysics 28, no. 1-2 (March 1997): 34–38. http://dx.doi.org/10.1071/eg997034.

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3

Cotching, W. E., J. Cooper, L. A. Sparrow, B. E. McCorkell, and W. Rowley. "Effects of agricultural management on dermosols in northern Tasmania." Soil Research 40, no. 1 (2002): 65. http://dx.doi.org/10.1071/sr01006.

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Attributes of 15 Tasmanian dermosols were assessed using field and laboratory techniques to determine changes associated with 3 typical forms of agricultural management: long-term pasture, cropping with shallow tillage using discs and tines, and cropping (including potatoes) with more rigorous and deeper tillage including deep ripping and powered implements. Soil organic carbon in the surface 75 mm was 7.0&percnt; under long-term pasture compared with 4.3&percnt; and 4.2&percnt; in cropped paddocks. Microbial biomass carbon concentrations were 217 mg/kg, 161 mg/kg, and 139 mg/kg, respectively. These differences were negatively correlated with the number of years cropped. Greater bulk densities were found in the surface layer of cropped paddocks but these were not associated with increased penetration resistance or decreased infiltration rate and are unlikely to impede root growth. Long-term pasture paddocks showed stronger structural development and had smaller clods than cropped paddocks. Vane shear strength and penetration resistance were lower in cropped paddocks than under long-term pasture. Many soil attributes showed no significant differences associated with management. Including potatoes in the rotation did not appear to affect these dermosols, which indicates a degree of robustness in these soils. clay loams, organic carbon, soil strength, aggregate stability, land management, cropping.

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4

Van Moort, J. C., and D. W. Russell. "Electron spin resonance of auriferous and barren quartz at Beaconsfield, Northern Tasmania." Journal of Geochemical Exploration 27, no. 1-2 (October 1987): 227–37. http://dx.doi.org/10.1016/0375-6742(87)90021-5.

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5

Van Moort, J. C., and D. W. Russell. "Electron spin resonance of auriferous and barren quartz at beaconsfield, Northern Tasmania." Journal of Geochemical Exploration 27, no. 3 (December 1987): 227–37. http://dx.doi.org/10.1016/0375-6742(87)90153-1.

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6

MORLEY, C. K., N. SANGKUMARN, T. B. HOON, C. CHONGLAKMANI, and J. LAMBIASE. "Structural evolution of the Li Basin, northern Thailand." Journal of the Geological Society 157, no. 2 (March 2000): 483–92. http://dx.doi.org/10.1144/jgs.157.2.483.

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7

Leaman, D. E., and R. G. Richardson. "Production of a residual gravity field map for Tasmania and some implications." Exploration Geophysics 20, no. 2 (1989): 181. http://dx.doi.org/10.1071/eg989181.

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The substantial gravity data base in Tasmania has been used to formulate a regional crustal model. This was derived by array modelling techniques for geological sources of crustal scale. A simultaneous solution for mantle, basement and granite forms was created by this means within a framework of realistic and internally consistent assumptions. The regional field derived from this geological model (including the ocean basins) is not dependent on any filtering or smoothing procedure and thus the magnitude and sign of any residuals is absolute. The residual map was produced by removing the effect of the crustal model at individual data points. The resultant map enables detailed and reliable modelling of upper crustal features as well as revealing crustal character hitherto concealed beneath post Carboniferous cover. An important example of the value of the residual separation is shown by the structural relationships exposed in NE Tasmania which involve gold mineralisation.

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8

Fossen, Haakon, and Jonny Hesthammer. "Structural geology of the Gullfaks Field, northern North Sea." Geological Society, London, Special Publications 127, no. 1 (1998): 231–61. http://dx.doi.org/10.1144/gsl.sp.1998.127.01.16.

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9

Bendall, M. R., J. K. Volkman, D. E. Leaman, and C. F. Burrett. "RECENT DEVELOPMENTS IN EXPLORATION FOR OIL IN TASMANIA." APPEA Journal 31, no. 1 (1991): 74. http://dx.doi.org/10.1071/aj90007.

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Recent work on oil seeps, organic geochemistry, geophysics, structural geology and palaeontology suggests that there is considerable potential for onshore petroleum in Tasmania.Archival research has shown that hydrocarbon seeps were commonly reported in the first half of this century and that wildcats produced gas (at Port Sorell in the north) and oil (at Johnson's Well on Bruny Island, in the south). Almost all of the 270 historical hydrocarbon occurrences lie on lineaments revealed independently by gravity and magnetic surveys. The thermal maturity of conodonts from Ordovician and Siluro-Devonian carbonates suggests that much of the pre-Upper Carboniferous beneath the Tabberabberan unconformity is within the oil and gas windows.Organic geochemistry reveals a very close similarity between hydrocarbons from Ordovician limestones, those from the drill site at Bruny Island and with tar samples from the Tasmanian coast, but little similarity with the Permian Tasmanite Oil Shale, or with the Gippsland crudes and botryococcane-rich South Australian bitumens. The predominance of C27 steranes in Tasmanian bitumens suggests a widespread algal source and the abundant diasteranes imply a clay or silt-rich source that extends across much of Tasmania.Recent geophysical and structural work suggests that a thin skinned interpretation of Tasmania's structure is reasonable. Most sightings of hydrocarbons are associated with either faults or fractures which have post-Jurassic displacements or with intersections of major high angle faults with thrusts. The delineation of reservoirs within the thrust sheets is a priority.

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10

Hamdoon, Alaa N. "Structural Analysis and Morphotectonic Interpretation of Ain Sifni Anticline, Northern Iraq." Iraqi Geological Journal 54, no. 2A (July 31, 2021): 49–59. http://dx.doi.org/10.46717/igj.54.2a.4ms-2021-07-25.

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Ain Sifni anticline is located in northern Iraq within High Folded Zone. It contains some tectonic deformations that need to study to determine the source and mechanism of these deformations concerning the geological setting of the study area. This study includes structural and morphotectonic interpretations for the Ain Sifni anticline, such as the visual & digital interpretation of satellite images and the Digital Elevation Model interpretation. These parameters are used to identify the morphogenic criteria and subsequently, to conclude a morphotectonic aspect of the deformations in the Ain Sifni anticline. Because of the regional tectonic evolution in this area, the structural and morphotectonic analysis of this anticline shows much evidence of morphological changes at the southeastern plunge area of the anticline within the Injana and Mukdadiya formations in comparison to the northwestern plunge area of the anticline. In addition, two recent water gaps have been recognized at the southeastern plunge area, one is confirmed and the other is proposed, and then a wind gap has been recognized in the middle of the anticline. A relation has been established between these morphotectonic features with the lateral propagation of the anticline towards the southeast, due to the regional tectonic deformation. A significant main fault has also been detected as a dextral strike-slip fault perpendicular to the fold axis of the anticline. This fault caused a difference in the vergency of the anticline and deformed the outcrops of formations in the study region.

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11

Hughes, Andy. "Meeting report: ANCOLD conference, Hobart, Tasmania, November 2010." Dams and Reservoirs 21, no. 1 (March 2011): 7–8. http://dx.doi.org/10.1680/dare.2011.21.1.7.

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12

Read, J. J. "Seismic reflection investigations of the Hellyer orebody and Que-Hellyer volcanics, North West Tasmania." Exploration Geophysics 20, no. 2 (1989): 159. http://dx.doi.org/10.1071/eg989159.

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Two separate seismic reflection surveys have been conducted over Aberfoyle Resources Hellyer orebody and the enclosing Cambrian Que-Hellyer volcanics. The initial survey, conducted as a test case to determine if seismic reflection techniques could detect massive sulphide orebodies at depth, successfully identified the Hellyer orebody, which was found to have a characteristic seismic expression. Identification and mapping of stratigraphic units within the Que-Hellyer volcanics was also possible due to the good geological control available.The second survey did not successfully identify the Hellyer orebody, although some information relating to the structure of the enclosing basin could be inferred from the seismic data. Due to data degradation conventional seismic interpretation techniques could not be applied to the second survey.High resolution seismic surveys can detect massive sulphide orebodies if low velocity overburden problems are eliminated and high frequency data is collected. High resolution surveys can also provide structural and stratigraphic information between widely spaced drill holes in volcanic terrains.

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13

Iasky, R. P., and A. J. Mory. "Structural and Tectonic Framework of the Onshore Northern Perth Basin." Exploration Geophysics 24, no. 3-4 (September 1993): 585–92. http://dx.doi.org/10.1071/eg993585.

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14

Cotching, W. E., J. Cooper, L. A. Sparrow, B. E. McCorkell, W. Rowley, and K. Hawkins. "Effects of agricultural management on Vertosols in Tasmania." Soil Research 40, no. 8 (2002): 1267. http://dx.doi.org/10.1071/sr02026.

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Attributes of 21 Vertosols in 2 different regions of Tasmania were assessed using field and laboratory techniques to determine differences associated with 3 local forms of agricultural management (long-term pasture, rain-fed cropping and irrigated cropping). Vertosols in the northern Midlands had better physical properties (lesser bulk density and penetration resistance, and greater porosities and water holding capacities), poorer nutrient status (lower pH, exchangeable bases, and extractable P) and better biological properties (greater organic carbon (OC), carbon fractions F1 and F3, and more worms) than south-eastern Vertosols. When adjusted for clay content, cropped sites had less soil OC than pasture sites at 0–75 mm depth. Readily oxidisable (fraction F1) carbon in the surface 75 mm was 3.6 mg/g and 6.9 mg/g under long-term pasture compared with 2.5 mg/g and 3.9 mg/g in irrigated cropped paddocks on south-eastern and Midlands sites, respectively. Soil organic carbon values were positively correlated with physical and chemical soil properties. Long-term pasture paddocks showed stronger structural development and had smaller aggregates than cropped paddocks, which had more larger clods. Vane shear strength and penetration resistance were less in rainfed cropped paddocks compared with long-term pasture but this effect was not apparent on irrigated cropped paddocks. Farmers considered that a majority of their soil attributes were healthy under all management histories but strategies for maintaining organic matter levels and minimising clod formation by tillage are essential for long-term sustainable use of these Vertosols.

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15

Špelić, Marko, Anna Del Ben, and Krešimir Petrinjak. "Structural setting and geodynamics of the Kvarner area (Northern Adriatic)." Marine and Petroleum Geology 125 (March 2021): 104857. http://dx.doi.org/10.1016/j.marpetgeo.2020.104857.

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16

Corbett, Michael, Sharon Fraser, Robyn Reaburn, Heidi Smith, Janine Roberts, and Jill Fielding-Wells. "Building A New Generation: Community Expectations On Raising Aspirations In Rural Tasmania." Australian and International Journal of Rural Education 27, no. 3 (December 9, 2017): 8–24. http://dx.doi.org/10.47381/aijre.v27i3.139.

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This paper analyses a community-based educational program involving private and public sector partners instituted in a small city in northern Tasmania. The program represents part of a state-wide initiative to challenge the persistence of structural educational disadvantage and what is understood to be an entrenched â€œcultureâ€ that is insufficiently attuned to the necessity of further education. In this paper, we analyse this program from the perspective of key community partners drawing on a series of semi-structured interviews. We offer an analytic framework that suggests an integrated approach to thinking about supporting educational achievement, attainment and retention in regional Australia. It is our view while there is much that regional communities struggling with change can learn from this program, there are conceptual limitations in the way the problem of educational achievement is understood that should be enhanced by a more comprehensive understanding.

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17

Morgan, Mark A., John Grocott, and Richard T. J. Moody. "The structural evolution of the Zaghouan-Ressas Structural Belt, northern Tunisia." Geological Society, London, Special Publications 132, no. 1 (1998): 405–22. http://dx.doi.org/10.1144/gsl.sp.1998.132.01.23.

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18

Van der Wateren, Frederik M. "Structural geology and sedimentology of the Heiligenhafen till section, Northern Germany." Quaternary Science Reviews 18, no. 14 (December 1999): 1625–39. http://dx.doi.org/10.1016/s0277-3791(98)00120-6.

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19

Köküm, Mehmet, and Murat İnceöz. "Structural analysis of the northern part of the East Anatolian Fault System." Journal of Structural Geology 114 (September 2018): 55–63. http://dx.doi.org/10.1016/j.jsg.2018.06.016.

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20

Vetterlein, Joyce, and Gerald P. Roberts. "Structural evolution of the Northern Cerberus Fossae graben system, Elysium Planitia, Mars." Journal of Structural Geology 32, no. 4 (April 2010): 394–406. http://dx.doi.org/10.1016/j.jsg.2009.11.004.

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21

Leonard, Steven W. J., and J. B. Kirkpatrick. "Effects of grazing management and environmental factors on native grassland and grassy woodland, Northern Midlands, Tasmania." Australian Journal of Botany 52, no. 4 (2004): 529. http://dx.doi.org/10.1071/bt03106.

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Most remnants of lowland grassland and grassy woodland in Tasmania are grazed by sheep. In some instances, grazed remnants have high conservation value, indicating that grazing and biodiversity conservation are not necessarily conflicting management goals. However, few data exist on the management practices most conducive to maintaining conservation values. The present study examined native grassland and grassy woodland subject to seven different sheep-grazing regimes in the Northern Midlands bioregion of Tasmania and sought to identify the effects of management and environmental factors on vegetation structure and composition. Structural and compositional differences between grassland and woodland, and herbivore scat counts, suggested that grazing disturbance was more intense in grassland than in woodland. Floristic differences within the vegetation appeared to be related to differences in grazing regime. Occurrence of species not commonly observed in grassy vegetation was associated with the resting of pastures in spring, while more intensely grazed sites contained assemblages of species typical of disturbed areas. Exotic invasion was greatest at sites that were not rested and/or had higher stocking rates, and at more eroded sites. Thus, resting and/or low stocking rates were associated with good condition in the grassland and grassy woodland. The nature of differences in vegetation attributes between woodland and grassland suggests that grazer habitat preference increases the differences between these vegetation types. Relatively minor variation in grazing regime was found to have resulted in distinct floristic outcomes, suggesting that the maintenance of a range of management regimes may be conducive to the maintenance of plant species diversity at a landscape scale.

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22

Mauffret, A., I. Contrucci, and C. Brunet. "Structural evolution of the Northern Tyrrhenian Sea from new seismic data." Marine and Petroleum Geology 16, no. 5 (August 1999): 381–407. http://dx.doi.org/10.1016/s0264-8172(99)00004-5.

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23

Moustafa, Adel R. "Structural architecture and tectonic evolution of the Maghara inverted basin, Northern Sinai, Egypt." Journal of Structural Geology 62 (May 2014): 80–96. http://dx.doi.org/10.1016/j.jsg.2014.01.014.

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24

Jackson, Christopher A. ‐L, Gavin M. Elliott, Elisabeth Royce‐Rogers, Robert L. Gawthorpe, and Tor E. Aas. "Salt thickness and composition influence rift structural style, northern North Sea, offshore Norway." Basin Research 31, no. 3 (February 21, 2019): 514–38. http://dx.doi.org/10.1111/bre.12332.

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25

Galli, Andrea, Neil Mancktelow, Eric Reusser, and Mark Caddick. "Structural geology and petrography of the Naret region (northern Valle Maggia, N.Ticino, Switzerland)." Swiss Journal of Geosciences 100, no. 1 (May 3, 2007): 53–70. http://dx.doi.org/10.1007/s00015-007-1211-7.

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26

Plesovskikh, I. A., I. I. Nesterov, L. A. Nechiporuk, and V. S. Bochkarev. "Structural features of the northern West Siberian geosyneclise and new exploration targets." Russian Geology and Geophysics 50, no. 9 (September 2009): 789–96. http://dx.doi.org/10.1016/j.rgg.2009.08.004.

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27

Turrini, Claudio, Olivier Lacombe, and François Roure. "Present-day 3D structural model of the Po Valley basin, Northern Italy." Marine and Petroleum Geology 56 (September 2014): 266–89. http://dx.doi.org/10.1016/j.marpetgeo.2014.02.006.

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28

Frassi, Chiara, Alessia Amorfini, Antonio Bartelletti, and Giuseppe Ottria. "Popularizing Structural Geology: Exemplary Structural Geosites from the Apuan Alps UNESCO Global Geopark (Northern Apennines, Italy)." Land 11, no. 8 (August 10, 2022): 1282. http://dx.doi.org/10.3390/land11081282.

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Popularizing endogenic geological processes that act deep on the Earth during geologic time producing orogenic belts requires a great effort. Consequently, geosites dealing with structural geology are surveyed with a lower frequency. Geological structures, however, may strongly control and model the territory and/or trigger the exogenous processes responsible for a specific landform/landscape. We describe here three geosites in the Apuan Alps UNESCO Global Geopark (Tuscany, Italy) to highlight their geoheritage values. We used the classical methods applied in structural geology to conceive and design three new interpretative panels of structural geosites using simple language and graphic schemes that facilitate the understanding of geological structures. The three selected structures were produced by different deformation regimes and at different structural depths. The first geosite is the boundary between the metamorphic and non-metamorphic rocks and represents the boundary of the Apuan Alps tectonic window. The second geosite is the spectacular Mt. Forato natural arch and the third represents a beautiful example of folds. Each panel is characterized by QR codes that allow the reader to access a short geological glossary, the Apuan Alps Geopark website, and a short evaluation survey on the quality of the interpretative panel.

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29

Fitzsimons, Sean J., and Eric A. Colhoun. "Pleistocene glaciation of the King Valley, Western Tasmania, Australia." Quaternary Research 36, no. 2 (September 1991): 135–56. http://dx.doi.org/10.1016/0033-5894(91)90022-w.

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AbstractAnalysis of the geomorphology, geology, and palynology of deposits in the King Valley permits the identification of four glaciations and two interglaciations and has led to a revision of the Pleistocene stratigraphy of the West Coast Range. The oldest late-Cenozoic deposits in the valley appear to predate glaciation, contain extinct pollen types, and are probably of late-Tertiary age. Overlying deposits of the Linda Glaciation show intense chemical weathering and have a reversed detrital remanent magnetization indicating deposition before 730,000 yr B.P. The highly weathered tills are conformably overlain by organic deposits of the Regency Interglaciation which show a transition from montane scrub rainforest to lowland temperate rainforest. Deposits formed during the later Moore Glaciation record advances of the King Glacier and glaciers from the West Coast Range. A pollen-bearing fluvial deposit records an interstade during this glaciation. On the basis of weathering rinds, amino acid dating, and palaeomagnetism the deposits are estimated to have formed between 730,000 and 390,000 yr B.P. The Moore Glaciation deposits are overlain by sediments of the Henty Glaciation which are believed to predate 130,000 yr B.P. These deposits record multiple advances of the King Glacier and the development of a large lake during an interstade. Deposits of the subsequent Pieman Interglaciation consist of organic fine sands and silts that record a lowland scrub rainforest. Deposits of the last (Margaret) glaciation are restricted to small areas in the northern part of the valley. Although the most recent ice advance culminated after 19,000 yr B.P., evidence of older deposits of the Margaret Glaciation suggests that an early last-glaciation ice advance may have occurred. When combined with earlier studies, the recent work in the King Valley has provided one of the more complete records of Pleistocene glaciation in the Southern Hemisphere. Comparison of the deposits with the record of glaciation in southern South America and Westland, New Zealand, suggests some similarities exist between pre-last-glaciation events and indicates that glacial events in Southern Hemisphere middle latitude areas were synchronous during the last glaciation.

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30

Labbé, N., M. García, Y. Simicic, E. Contreras-Reyes, R. Charrier, G. De Pascale, and C. Arriagada. "Sediment fill geometry and structural control of the Pampa del Tamarugal basin, northern Chile." GSA Bulletin 131, no. 1-2 (September 12, 2018): 155–74. http://dx.doi.org/10.1130/b31722.1.

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31

Escuder-Viruete, Javier, Andrés Pérez-Estaún, Janet Gabites, and Ángela Suárez-Rodríguez. "Structural development of a high-pressure collisional accretionary wedge: The Samaná complex, Northern Hispaniola." Journal of Structural Geology 33, no. 5 (May 2011): 928–50. http://dx.doi.org/10.1016/j.jsg.2011.02.006.

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32

WHEELER, J. "Structural evolution of a subducted continental sliver: the northern Dora Maira massif, Italian Alps." Journal of the Geological Society 148, no. 6 (November 1991): 1101–13. http://dx.doi.org/10.1144/gsjgs.148.6.1101.

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33

Pedersen, Schack. "Progressive glaciotectonic deformation in Weichselian and Palaeogene deposits at Feggeklit, northern Denmark." Bulletin of the Geological Society of Denmark 42 (February 1, 1996): 153–74. http://dx.doi.org/10.37570/bgsd-1995-42-13.

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Structural analysis of the glaciotectonic deformations at Feggeklit, Mors, Denmark, provide a unique record of succesive deformation phases in a progressive glaciotectonic deformation. The Feggeklit profile displays glaciotectonically folded, thrust-faulted and sheared Palaeogene diatomite with thin volcanic ash layers, the Fur Formation, overlain by a glacigene succession. The combination of stratigraphical and structural analysis shows that the Feggeklit was affected by three glaciodynamic events. The first event is of Saalian age and is represented by the deposition of a till and the formation of a para-authochthonous glacitectonite in the top of the Fur Formation deposits. The second event is only represented by the deposition of a till, probably of Saalian age. The third event is of Late Weichselian age. It includes: 1) deposition of proglacial glaciolacustrine and -fluvial sediments, 2) the formation of a glaciotectonic unit (the Feggeklit deformation complex) and 3) deposition of a till resting on a tectonic uncon-formity formed subglacially. A detailed structural analysis of the glaciotectonic unit provides a subdivision into five succesive deformation phases. The first four phases are related to the proglacial deformation and comprise 1) anastamosing jointing, 2) conjugate faulting, 3) buckle folding and listric thrust faulting, and 4) large scale ramp thrusting. The final phase (5) is related to subglacial shear deformation and loading which produced an allochthonous diatomiteglacitectonite at the sole of the overlying lodgement till. The formation of the structural complex at Feggeklit was caused by two glaciotectonic mechanisms: 1) a proglacial gravity spreading deformation, and 2) a subglacial cataclastic shearing. The balanced cross-section of the fold structures related to the first deformation mechanism indicates that the detachment of the dislocation is situated below the base of the diatomite formation in the plastic clay at a depth of 80-100 m below the surface. Based on the glaciodynamic analysis and considerations on the dating of regional glacigenic setting the velocity of the advancing ice is estimated at 10 m per year. This advance created the gravity spreading deformation reflected in the glaciotectonic structures preserved in the Feggeklit.

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34

WELLS, ALICE, KJELL ARNE JOHANSON, and PETER DOSTINE. "Why are so many species based on a single specimen?" Zoosymposia 14, no. 1 (July 15, 2019): 32–38. http://dx.doi.org/10.11646/zoosymposia.14.1.5.

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A considerable number of insect species, including Trichoptera, are described from a single specimen, also known as a 'unique' or a 'singleton'. We ask the question of whether this reflects failure to consider variation and related species, lack of collecting effort, or true rarity. In an attempt to answer this question we examine the available literature and data on the Trichoptera of Tasmania and New Caledonia. We note a low level of taxonomic synonymy among species in these faunas. Moreover, a significant proportion of species from Tasmania that were based originally on singletons have been re-collected subsequently, but this is not true for New Caledonia. The possible significance of these figures is considered following examination of data on diversity and abundance of Hydroptilidae collected by regular, standardised light trapping over almost two years at a northern Australian tropical stream. We conclude that quite a large proportion of the Trichoptera species based on singletons are rare, valid species, but for others the appearance of rarity may be a consequence of inadequate collecting, particular behavioural attributes of the species, including seasonality, and failure to consider fully the structural diversity of related species. Lastly, we discuss briefly the consequences of rarity, apparent or real, on conservation management.

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35

Ingersoll, Raymond V. "Structural and Stratigraphic Evolution of the Rio Grande Rift, Northern New Mexico and Southern Colorado." International Geology Review 43, no. 10 (October 2001): 867–91. http://dx.doi.org/10.1080/00206810109465053.

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36

Tavarnelli, Enrico. "Ancient synsedimentary structural control on thrust ramp development: an example from the Northern Apennines, Italy." Terra Nova 8, no. 1 (January 1996): 65–74. http://dx.doi.org/10.1111/j.1365-3121.1996.tb00726.x.

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37

Gerbi, C., S. M. Roeske, and J. S. Davis. "Geology and structural history of the southwest Precordillera margin, northern Mendoza Province, Argentina." Journal of South American Earth Sciences 14, no. 8 (March 2002): 821–35. http://dx.doi.org/10.1016/s0895-9811(01)00080-3.

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38

Castellarin, Alberto, and Luigi Cantelli. "Geology and evolution of the Northern Adriatic structural triangle between Alps and Apennine." RENDICONTI LINCEI 21, S1 (June 24, 2010): 3–14. http://dx.doi.org/10.1007/s12210-010-0086-0.

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39

Smit, C. A., D. D. Van Reenen, S. McCourt, J. M. Huizenga, G. Belyanin, and N. A. Vafeas. "Hypozonal orogenic gold mineralization in the Giyani Goldfield, Northern Kaapvaal Craton/Limpopo Complex." South African Journal of Geology 122, no. 4 (December 1, 2019): 455–88. http://dx.doi.org/10.25131/sajg.122.0037.

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Abstract The paper reviews published and unpublished geological data pertaining to the structural and metamorphic controls, rock types, characteristic features, source, and timing of hypozonal orogenic gold mineralization in the Giyani Goldfield. The Giyani Goldfield includes the NW domain of the >3.0 Ga Giyani greenstone belt (GGB) at the northern edge of the Kaapvaal Craton and the southern retrograde hydrated domain of the juxtaposed Southern Marginal Zone (SMZ) of the ca. 2.72 Ga Limpopo Complex (LC). Mineralization at all gold mines and gold prospects of the Giyani Goldfield is structurally controlled and closely associated with the Hout River shear zone (HRSZ) and associated smaller shear zones suggesting a specific tectonic setting. This tectonic setting is the direct consequence of thrusting the SMZ of the LC against and over the adjacent GGB at the position of the steeply north-dipping (south verging) HRSZ during the exhumation stage of the ca. 2.72 to 2.69 Ga Limpopo orogeny followed by regional retrograde hydration of the southern part of the SMZ at ca. 2.68 to 2.62 Ga. This tectonic setting offers an explanation for a deep-seated crustal source for gold and for the concentration of orogenic gold mineralization within specific structural features located within the Giyani Goldfield. This tectonic setting also explains the lithological, structural and metamorphic complexity, metasomatic alteration and post-peak metamorphic timing of gold mineralization. Finally, it provides important clues with regards to a crustal source for gold mineralizing fluids and the identification of new potential targets for gold exploration in the Giyani Goldfield.

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Thannoun, Rayan. "Three Dimensional Terrain Modeling for Tectonic Geomorphology of Chinara Anticline, Northern Iraq." Iraqi Geological Journal 54, no. 1C (March 31, 2021): 53–65. http://dx.doi.org/10.46717/igj.54.1c.5ms-2021-03-25.

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Analysis of the terrain using three-dimensional models offers a deep insight view of ground surface topography and terrain representation. The Chinara anticline is one of the main structures of NW-SE trends for the highly folded zone in northeastern Iraq. The objective of this study is to understand the interrelationship between topography and morphotectonic features using three-dimensional models. This research employed fourth generates principal raster derivative products from the DEM using ArcGIS. To understand the undulating of this anticline with the morphotectonic style, the adaptive equation has been suggested to determine the direction and amount of the main tectonic forces, which can be applied to other undulated anticlines. The values of northeastern and southwestern limbs undulating index UI are 11.7 and 7.8 respectively that indicates the strong tectonic force towards the northeast. Two listric faults have been conducted via the field survey that confirmed by remotely sensed interpretation and DEM products. These listric faults had an intensive impact in comparison with concluded strike-slip faults, and then the Chinara anticline would be less structural undulating in a region of vicinity syncline to Perat undulation. The morphotectonic landscapes reveal that the listric fault has branched into two parts, the first one extending to form the anticline and the other comprises the structural dilemma.

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Passchier, C. W., R. F. Bekendam, J. D. Hoek, P. G. H. M. Dirks, and H. de Boorder. "Proterozoic geological evolution of the northern Vestfold Hills, Antarctica." Geological Magazine 128, no. 4 (July 1991): 307–18. http://dx.doi.org/10.1017/s0016756800017581.

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AbstractThe presence of polyphase shear zones transected by several suites of dolerite dykes in Archaean basement of the Vestfold Hills, East Antarctica, allows a detailed reconstruction of the local structural evolution. Archaean and early Proterozoic deformation at granulite facies conditions was followed by two phases of dolerite intrusion and mylonite generation in strike-slip zones at amphibolite facies conditions. A subsequent middle Proterozoic phase of brittle normal faulting led to the development of pseudotachylite, predating intrusion of the major swarm of dolerite dykes around 1250 Ma. During the later stages and following this event, pseudotachylite veins were reactivated as ductile, mylonitic thrusts under prograde conditions, culminating in amphibolite facies metamorphism around 1000–1100 Ma. This is possibly part of a large-scale tectonic event during which the Vestfold block was overthrust from the south. In a final phase of strike-slip deformation, several pulses of pseudotachylite-generating brittle faulting alternated with ductile reactivation of pseudotachylite.

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Cooper, David J. W., Michael P. Searle, and Mohammed Y. Ali. "Structural evolution of Jabal Qumayrah: A salt-intruded culmination in the northern Oman Mountains." GeoArabia 17, no. 2 (April 1, 2012): 121–50. http://dx.doi.org/10.2113/geoarabia1702121.

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ABSTRACT The Jabal Qumayrah area of the northern Oman Mountains records the evolution and subsequent destruction of a Mesozoic passive continental margin in the Oman segment of the Neo-Tethys Ocean, followed by the re-establishment of a passive margin, punctuated by phases of Tertiary compression. Almost uniquely along the Oman Mountains, it also contains intrusions of salt. Detachment of oceanic sediments and volcanics during the early phases of NE-directed subduction beneath the nascent Semail Ophiolite created an in-sequence stack of imbricated thrust units comprising distal trench units (Haybi Complex), and deep-ocean and continental rise sediments derived from the Mesozoic Oman margin (the Hawasina Complex). These were emplaced onto the depressed margin beneath and ahead of the ophiolite during its obduction in the Cenomanian– Coniacian. The Mesozoic continental slope sediments of the Sumeini Group had already been largely over-ridden by the more distal thrust sheets when the Hawasina sole thrust propagated into those sediments. This detached a Sumeini Group thrust sheet, which was transported westward for at least 7 km, carrying with it the overlying Hawasina thrust stack. Structurally lower parts of the Hawasina thrust stack (Hamrat Duru Group) also extended ahead of the Sumeini Group thrust sheet, but they were not restacked with it, indicating motion continued along this part of the Hawasina sole thrust. Further footwall collapse detached at least one more imbricate within the Sumeini Group and the combined thrust stack was then folded along a N-S axis, possibly above a frontal ramp. This was associated with complex out-of-sequence forward and back-thrusting at the lower structural levels. A right-lateral scissors fault developed at right angles to the direction of nappe transport, associated with normal faulting down-to-south. Late-stage culmination within the nappe pile created an asymmetrical west-facing dome, around which the structurally overlying Hawasina thrust sheets are folded. Passive margin sedimentation was re-established in the Campanian–Maastrichtian following subsidence of the locally emergent nappe pile and was dominated by carbonate sedimentation with little clastic input from the ophiolite or Hawasina sediments. Stable sedimentation persisted until Oligocene–Miocene compression, synchronous with the Zagros compressional event in Iran, resulted in west-facing folding along the western side of the northern Oman Mountains and their subsequent uplift. The Jabal Qumayrah massif preserves a salt intrusion composed of gypsum and anhydrite, the top of which is now exposed in the centre of the culmination. The origin of the salt remains unclear and investigations continue. Possible sources include the extension of the major regional salt basins found in the foreland, in particular those at the Ediacaran/Cambrian boundary (Ara Group), beneath the Hawasina Nappes and Semail Ophiolite. Alternatively, evaporitic basins may have developed locally along the edge of the proto Neo-Tethyan margin during the earliest rifting phase, beneath what became the continental slope deposits, although there is little evidence for these elsewhere in the autochthonous shelf succession.

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Cooper, David J. W., Mohammed Y. Ali, Michael P. Searle, and Ali I. Al-Lazki. "Salt intrusions in Jabal Qumayrah, northern Oman Mountains: Implications from structural and gravity investigations." GeoArabia 18, no. 2 (April 1, 2013): 141–76. http://dx.doi.org/10.2113/geoarabia1802141.

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ABSTRACT The Jabal Qumayrah area, 50 km ESE of Al Ain and Buraimi, preserves a culmination of Jurassic and Cretaceous continental slope deposits (Sumeini Group) that was emplaced during the Late Cretaceous onto the Oman margin with other Neo-Tethyan units and the Semail Ophiolite. Almost uniquely in the Oman Mountains, Jabal Qumayrah also contains outcrops of gypsum and anhydrite that occur as a central complex from which laterally discontinuous linear and arcuate outcrops extend up to 4 km to the northwest and south. The gypsum and anhydrite bodies contain sedimentary clasts and rafts, which show close affinities with the local Sumeini Group host rock. There are no sedimentary features that indicate the evaporites were deposited in situ, either as part of, or unconformably overlying the Sumeini Group. Boundaries with the host rock are either high-angle faults or steep and intrusive, with significant dissolution of host rock limestones. Two gravity transects across the area indicate the areas of gypsum and anhydrite lie on a gravity low, compatible with an elongated, high-level body concentrated along the main N-S axis of the Jabal Qumayrah dome. Taken together, these features point towards an intrusive origin for the evaporite bodies in Jabal Qumayrah. While the sub-surface is poorly constrained, the central complex is interpreted as representing the deeply weathered top of a salt diapir, whose emplacement had a strong tectonic fault-driven component. The smaller, discontinuous exposures to the northwest and south are interpreted as pods of gypsum and anhydrite that were injected along faults. The absence of other evaporite minerals, in particular halite, is attributed to deep weathering and dissolution similar to that seen at the surface-piercing salt domes of the Ghaba Salt Basin in central Oman. In the absence of unequivocal dating evidence, the regional context suggests the intrusion may be derived from evaporites within the Ediacaran–Early Cambrian Ara Group. These form large deposits in the Fahud and Ghaba salt basins to the southwest of the Oman Mountains and the Hormuz Salt Basin to the north. The Jabal Qumayrah area may represent another, smaller basin or an extension to the Fahud Basin. The Jabal Qumayrah intrusion does not contain rafts of Ara Group limestones, which characterise the salt diapirs of the Ghaba Salt Basin, but this is not considered diagnostic. Other regional evaporite units of Permian to Jurassic ages do not extend into the area of the Oman Mountains and are thus unlikely potential sources. There is no evidence to suggest the Jabal Qumayrah culmination was thrust over Cenozoic evaporites and this potential source is also discounted. The timing of intrusion is constrained by the boundary faults, which cut across and thus post-date structures related to the Late Cretaceous emplacement of the Sumeini Group of Jabal Qumayrah. There is no evidence of any movement since the unroofing and exposure of the salt intrusion, which began in the Late Miocene.

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Moustafa, Adel R., and Hussein G. A. Fouda. "Structural architecture and tectonic evolution of the Yelleg inverted half graben, northern Sinai, Egypt." Marine and Petroleum Geology 51 (March 2014): 286–97. http://dx.doi.org/10.1016/j.marpetgeo.2014.01.001.

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ter Borgh, M. M., B. Jaarsma, and E. A. Rosendaal. "Structural development of the northern Dutch offshore: Paleozoic to present." Geological Society, London, Special Publications 471, no. 1 (March 20, 2018): 115–31. http://dx.doi.org/10.1144/sp471.4.

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Domínguez, R. "Structural evolution of the Penguins Cluster, UK northern North Sea." Geological Society, London, Special Publications 292, no. 1 (2007): 25–48. http://dx.doi.org/10.1144/sp292.2.

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Levi, Nicola, Lidia Pittarello, and Mario Habermueller. "Structural characteristics of the curved Königsee-Lammertal-Traunsee fault system in Salzkammergut (Northern Calcareous Alps, Austria)." Journal of Structural Geology 155 (February 2022): 104503. http://dx.doi.org/10.1016/j.jsg.2021.104503.

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48

Gabet, Emmanuel J. "Lithological and structural controls on river profiles and networks in the northern Sierra Nevada (California, USA)." GSA Bulletin 132, no. 3-4 (July 15, 2019): 655–67. http://dx.doi.org/10.1130/b35128.1.

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Abstract In this study, the strong lithological heterogeneity of the northern Sierra Nevada (California, USA) is exploited to elucidate the role of lithology on river profiles and patterns at the mountain-range scale. The analyses indicate that plutonic, metavolcanic, and quartzite bedrock generally host the steepest river reaches, whereas gentle reaches flow across non-quartzite metasedimentary rocks and fault zones. In addition, the largest immobile boulders are often in the steepest reaches, suggesting that wide joint spacing plays a role in creating steep channels, and a positive relationship between boulder size and hillslope angle highlights the coupling of the hillslope and fluvial systems. With respect to river network configurations, dendritic patterns dominate in the plutonic bedrock, with channels aligned down the slope of the range; in contrast, river reaches in the metamorphic belts are mainly longitudinal and parallel to the structural grain. River profiles and patterns in the northern Sierra Nevada, therefore, bear a strong lithological imprint related to differential erosion. These observations indicate that attempts to infer uplift and tilting of the range based on the gradients and orientations of paleochannel remnants should first account for the effect of bedrock erodibility. Indeed, the differences in gradients of Tertiary paleochannel remnants used to argue for late Cenozoic uplift of the range can be wholly explained by differences in lithology.

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Granado, Pablo, Eduard Roca, Philipp Strauss, Klaus Pelz, and Josep Anton Muñoz. "Structural styles in fold-and-thrust belts involving early salt structures: The Northern Calcareous Alps (Austria)." Geology 47, no. 1 (November 30, 2018): 51–54. http://dx.doi.org/10.1130/g45281.1.

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Hughes, R. A., A. H. Cooper, and P. Stone. "Structural evolution of the Skiddaw Group (English Lake District) on the northern margin of eastern Avalonia." Geological Magazine 130, no. 5 (September 1993): 621–29. http://dx.doi.org/10.1017/s0016756800020926.

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AbstractThe Skiddaw Group comprises a marine sedimentary sequence deposited on the northern margin of eastern Avalonia in Tremadoc to Llanvirn times. It is unconformably overlain by subduction-related volcanic rocks (the Eycott and Borrowdale Volcanic groups) of mid-Ordovician age, and foreland basin marine strata of late Ordovician and Silurian age. The Skiddaw Group has a complex deformation history. Syn-depositional deformation produced soft sediment folds and an olistostrome. Volcanism was preceded (in late Llanvirn to Llandeilo times) by regional uplift and tilting of the Skiddaw Group, probably caused by the generation of melts through subduction-related processes. The Acadian (late Caledonian) deformation event produced a northeast- to east-trending regional cleavage, axial planar to large scale folds, and a later set of southward-directed thrusts with associated minor folds and crenulation cleavages. This event affected the northern Lake District probably in the late Silurian and early Devonian. The Skiddaw Group structures contrast strongly with those formed during the same event in the younger rocks of the Lake District inlier. The contrasts are attributed to differing rheological responses to varying and possibly diachronous stresses, and to possible impedence of thrusting by the combined mass of the Borrowdale Volcanic Group and the Lake District batholith.

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