allochthonous vs autochthonous geology

1987) and southern Palmer Land (the Latady Group; Hunter & Cantrill 2006). This may be related to the Carboniferous metamorphism of the Deseado Massif in Patagonia (Pankhurst et al.
Figure 4 shows that the εNdi and geochronological data for igneous rocks from the Central and Eastern domains display similar isotopic signatures and model ages through time and similar trends in their evolution, and that both domains require involvement of Proterozoic crustal material (Millar et al. Although the Fossil Bluff Group unconformably overlies the LeMay Group turbidite sequence, the two units are dominantly in faulted contact along the LeMay Fault and overlap temporally (Doubleday et al. In Graham Land the Eastern Domain includes the metamorphic basement, Trinity Peninsula Group turbidites (interpreted by Vaughan & Storey 2000, to represent an accretionary complex), the Jurassic Botany Bay Group alluvial fan deposits, extensive Jurassic silicic volcanism of the Chon Aike Volcanic Group, and Neogene to recent alkaline volcanic rocks around James Ross Island (Rex 1976). 2005). 2012a) and have shown their affinity to the Fossil Bluff Group of the Western Domain rather than their original inclusion in the Central Domain. Autochthonous material, in … Like the Peninsula, the South American margin has had its tectonic history interpreted through autochthonous and allochthonous terrane accretion models. This correlates with the volcanic activity recorded in the Central Domain of NW Palmer Land from c. 153 to c. 107 Ma (Leat et al. (2001) for intrusive and volcanic rocks on the Antarctic Peninsula plotted according to their domain. Continental margin magmatism and sedimentation occurred during amalgamation and persistence of the Gondwana and Pangaea supercontinents. It is important to understand how globally representative these processes are and whether similar tectonic histories and characteristics can be observed along other continental margins, so here we compare our observations with other circum-Pacific continental margins. The Eastern Domain of Palmer Land is dominated by Jurassic-aged shallow marine to terrestrial sandstones and mudstones of the Latady Group and extensive gabbroic to granitic intrusions of the Lassiter Coast Intrusive Suite (Fig. 2004). Independent of the overall tectonic model, the geology of the Antarctic Peninsula can be divided into six broad units (Figs 1 and 2): the metamorphic basement; Palaeozoic to Triassic sedimentary rocks; Jurassic to Cenozoic sedimentary rocks; non-metamorphosed intrusive rocks; Jurassic to Palaeogene volcanic rocks; Neogene to Recent alkaline volcanic rocks. 1), this proposed terrane represents the former Gondwanan margin and preserves the autochthonous magmatism and sedimentation associated with subduction along this margin. 2012; Riley et al. 1; Doubleday & Storey 1998). An autochthon in structural geology is a large block or mass of rock which is in the place of its original formation relative to its basement or foundation rock. 2011b; Bradshaw et al. Vol: Alexander Is., 157–152 Ma (Macdonald et al. A palaeomagnetic study of Jurassic rocks from the Antarctic Peninsula and its implications. New Zealand is also a continuation of the proto-Pacific Gondwana margin and remains a classic example of terrane accretion during continental growth. The Antarctic Peninsula was initially interpreted as an autochthonous continental arc of the Gondwanan margin, which developed during Mesozoic subduction beneath the supercontinent (Suárez 1976). 2005). 2012a). Although it is principally included in the Eastern Domain, previous workers (Willan 2003; Wendt et al. However, similar tholeiitic mafic magmas were emplaced during the Cretaceous in NW Palmer Land (Central Domain) at c. 150 Ma and 84–72 Ma (Scarrow et al. 2).

OK. Said of material originating from a different locality than the one in which it has been deposited [16]. Continuing to use this site, you agree with this. Terrane Processes at the Margins of Gondwana, Geological Society, London, Special Publications, A preliminary assessment of the hydrocarbon potential of the Larsen Basin, Antarctica, On the origin of fore-arc basins: New evidence of formation by rifting from the Jurassic of Alexander Island, Antarctica, A unifying lithostratigraphy of late Cretaceous–early Tertiary fore-arc volcanic sequences on Alexander Island, Antarctica, The age and stratigraphy of fore-arc magmatism on Alexander Island, Antarctica, Ductile thrusting within subduction complex rocks on Signy Island, South Orkney Islands, Structural evolution of the magmatic arc in northern Palmer Land, Antarctic Peninsula. The allochthonous terrane accretion model previously proposed for the geological development of the Antarctic Peninsula continental margin arc is reviewed in light of recent data and the geology is reinterpreted as having evolved as an in situ continental arc. 2012b).

(2001) for felsic and mafic intrusions, and volcanic rocks from the Peninsula (Fig. Vaughan et al. This domain was correlated by Vaughan & Storey (2000) with the Carboniferous to Cretaceous arc magmatism and sediments of the Median Tectonic Zone of New Zealand, interpreted to be at least partly allochthonous (Bradshaw 1993). 2012a). [Geology] Pertaining to materials, particularly rock masses, that formed somewhere other than their present location, and were transported by fault movements, large-scale gravity sliding, or similar processes. allochthon; Translations These two formations are considered to be correlatives (Vaughan & Storey 2000) and record deposition in the Latady Basin during rifting of Gondwana. This interpretation of crustal assimilation as the dominant control on magnetic susceptibility is supported by the εNdi data (see above), which show decreased crustal assimilation during formation of the Early Cretaceous extensional magnetite-series intrusions of the Central Domain. 1998; Ferraccioli et al. OIB-like magmas and deep marine extensional sedimentary sequences within the Western Domain stratigraphy support an extensional margin, not a forearc depositional setting. 2012b). 2) does not support this hypothesis, and requires at least that the basement of the Central Domain suspect terrane be rifted from a Gondwana or a similarly old continental margin prior to arc development. See also autochthonous. This question is for testing whether or not you are a human visitor and to prevent automated spam submissions. 2002) indicates different crustal histories on the Peninsula.
Kemp et al. 5; Vaughan et al. 2012).

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