Origin and emplacement of a middle Cretaceous gneiss dome, Fosdick Mountains, West Antarctica

Siddoway, C. S.; Richard, S.M.; Luyendyk, Bruce P.

doi:10.1130/0-8137-2380-9.267

Cited by 21 publications

(50 citation statements)

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“…Ford Granodiorite represents the first in a succession of convergent margin arcs developed upon the East Gondwana margin from Ordovician through Early Cretaceous time (Pankhurst et al, 1998), and it has correlatives in New Zealand (Muir et al, 1996). Both Swanson Formation and Ford Granodiorite were affected by high-temperature (HT) metamorphism and their high-grade equivalents are exposed in the Fosdick Mountains migmatite gneiss dome (Siddoway et al, 2004b;Saito et al, 2007) (Figure 4). Temperatures in excess of 800°C, sufficient to cause voluminous melting, were attained two to three times in the history of the dome (Siddoway et al, 2006;Korhonen et al, 2007a,b).…”

Section: Extent Of the West Antarctic Rift System (Wars) And Charactementioning

confidence: 99%

“…The migmatite gneisses forming the core of the Fosdick Mountains dome reached temperatures (T) and pressures (P) of the upper amphibolite to granulite facies (Siddoway et al, 2004b;Korhonen et al, 2007a). Granite formed by biotite breakdown (Saito et al, 2007) forms sheets, stocks, and extensive interconnected networks on a scale of hundreds of meters.…”

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

“…Concordant layers of leucogranite may exceed 10 m in thickness. New U-Pb SHRIMP zircon studies (Siddoway et al, 2004b(Siddoway et al, , 2006McFadden et al, 2007) and isotope geochemistry (Saito et al, 2007) aid in the task of determining the extent and distribution of anatectic granites formed in Late Cretaceous time, coincident with development of the WARS.…”

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

“…New progress has been made in the region through tectonic investigations focused on the structure and metamorphic petrology of the Fosdick Mountains gneiss dome (Siddoway et al, 2004b;Korhonen et al, 2007a;McFadden et al, 2007), the configuration of mafic dikes representing a regional tensile array (Siddoway et al, 2005), and kinematic analysis of mesoscopic brittle faults . Airborne geophysical data over the Ford Ranges , and Edward VII Peninsula (Ferraccioli et al, 2002) delineate regional-scale faults.…”

Section: Geological Structure Of the Ford Ranges Marie Byrd Land: Damentioning

confidence: 99%

“…The Fosdick Mountains form an elongate migmatite gneiss dome (Wilbanks, 1972;Siddoway et al, 2004b) delimited by a S-dipping, dextral-oblique detachment zone on the south (McFadden et al, 2007) and by an inferred steep dextral strike-slip zone on the north, the Balchen Glacier fault (Siddoway et al, 2004b(Siddoway et al, , 2005. From lower to higher structural levels, gneisses that exhibit features indicative of melt-present ductile flow give way to mylonitic rocks exhibiting mixed ductile-brittle deformation textures, indicative of solid-state deformation (McFadden et al, 2007).…”

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

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Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Siddoway¹

2007

Open-File Report

109

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Section: Extent Of the West Antarctic Rift System (Wars) And Charactementioning

confidence: 99%

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

Section: Geological Structure Of the Ford Ranges Marie Byrd Land: Damentioning

confidence: 99%

Section: The Fosdick Mountains Gneiss Domementioning

confidence: 99%

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Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Siddoway¹

2007

Open-File Report

109

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Multianalytical provenance analysis of Eastern Ross Sea LGM till sediments (Antarctica): Petrography, geochronology, and thermochronology detrital data

Perotti

Andreucci

Talarico

et al. 2017

Geochem Geophys Geosyst

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In order to reveal provenance of detrital sediments supplied by West Antarctic Ice Sheet (WAIS), 19 glaciomarine cores of Last Glacial Maximum age were analyzed from Eastern Ross Sea and Sulzberger Bay. Analytical techniques included petrographic analysis of gravel‐sized clasts, geochronology (zircon U‐Pb: Zrn‐UPb) and thermochronology (apatite fission track: AFT) of sand‐sized fractions. Petrographic analysis revealed a similarity with the lithologies presently exposed in western Marie Byrd Land (MBL), with major roles played by low‐grade metamorphic rocks and granitoids. Furthermore Zrn‐UPb and AFT data allowed to identify the ages of formation and cooling of sedimentary source area, consisting of Cambrian‐Precambrian basement (i.e., Swanson Formation in western MBL) which underwent at least two episodes of magma intrusion, migmatization and cooling during Devonian‐Carboniferous and Cretaceous‐Paleocene times. Scarcity of volcanic clasts in the region of Ross Sea along the front of West Antarctica Ice Streams in association with the occurrence of AFT Oligocene‐Pliocene dates suggests a localized tectonic exhumation of portions of MBL, as already documented for the opposite side of West Antarctic Rift System in the Transantarctic Mountains. Furthermore, a Zrn‐UPb and AFT population of Late Triassic‐Jurassic age indicates the presence of unexposed rocks that formed or metamorphosed at that time in the sedimentary source area, which could be identified in McAyeal Ice Stream and Bindschadler Ice Stream catchment areas.

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Vertical tectonics of a Neoarchean gneiss dome in the eastern North China Craton

Liu

et al. 2023

Geological Journal

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Archean gneiss domes are a very common structure in old cratons, these are different from the structural patterns in the post‐Archean linear orogenic belts related to subduction and collision. There are two tectonic models in Archean tectonics: horizontal tectonism and vertical tectonism. The formation mechanisms of Archean gneiss domes are still debated. Here we present data from the Anziling gneiss dome, a typical gneiss dome structure from the eastern North China Craton, which was formed dominantly by vertical tectonism during Neoarchean times (2554–2452 Ma). The Anziling gneiss dome is located in the east of Shuangshanzi, East Heibei Province and consists of the Anziling gneiss (a diopside‐monzonitic gneiss) in the center outwards surrounded by the Jiguanshan gneiss (hornblende‐plagioclase gneiss) and the Niuxinshan gneiss (trondhjemitic gneiss), together showing an irregular elliptical shape with a NE‐ward extending tail on the surface. But in the cross‐section, it represents a deflective dome, both north‐western and south‐eastern limbs dip approximately to the west. The dome suffered inhomogeneous ductile shear deformation, much stronger with more displacement in the north‐western half (especially close to the margin) than that in the eastern half. The core area shows only a relatively weak deformation. Therefore, we suggest that the Anziling gneiss dome was formed by the TTG (trondhjemite, tonalite, granodiorite) pluton rising obliquely up towards the east by diapirism in the first stage, followed by sub‐horizontal emplacement towards the north and then to the north‐east associated with clockwise rotation in the second stage. The Anziling gneiss dome and its neighbouring Shuangshanzi shear zone were formed simultaneously, indicating that the Anziling gneiss dome was driven by both gravitational forces and magma diapirism.

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Origin and emplacement of a middle Cretaceous gneiss dome, Fosdick Mountains, West Antarctica

Cited by 21 publications

References 0 publications

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Tectonics of the West Antarctic rift system: new light on the history and dynamics of distributed intracontinental extension

Multianalytical provenance analysis of Eastern Ross Sea LGM till sediments (Antarctica): Petrography, geochronology, and thermochronology detrital data

Vertical tectonics of a Neoarchean gneiss dome in the eastern North China Craton

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