By J. Duncan Keppie, J. Brendan Murphy, F. Ortega-Gutierrez, W. G. Ernst
Inclusive of papers that experience seemed lately in foreign Geology evaluate, heart American Terranes, strength Correlatives, and Orogenic techniques specializes in center American terranes during which tectonic methods, together with flat-slab subduction, for orogenic improvement are tested at quite a few instances because the overdue Mesoproterozoic: at 1 Ga, in the course of the Paleozoic, and into the Cenozoic. Many papers relate the evolution of the center American terranes during the last billion years to worldwide scale occasions, and a moment topic operating in the course of the e-book pertains to the supercontinents, Rodinia and Pangea, the geometry in their amalgamation and breakup, and the techniques in charge. Highlights contain: · An replace at the geographic checklist, tectonic surroundings, and provenance of those terranes · Documentation of allocthonous nature and place peripheral to Amazonia of the ~1 Ga basement of southern Mexico · information demonstrating that the basement rocks have been desirous about numerous Phanerozoic tectonic occasions · An exam of recent facts of a past due Paleozoic occasion linked to the amalgamation of Pangea overprinting the ~1 Ga basement and the Paleozoic devices mendacity mainly to the west and south of it · An exploration of the subsequent power correlatives: (1) occasions in Europe at the northern margin of Gondwana; (2) the overdue Silurian-Devonian Acadian orogeny within the Appalachian, that's inferred to have resulted from flat-slab subduction on the topic of overriding a plume; and (3) Mesozoic-Cenozoic occasions alongside the western margin of Laurentia · A dialogue of attainable mechanisms for the initiation of orogeny, flat-slab subduction within the Laramide orogeny, and hypotheses on the subject of the amalgamation and breakup of supercontinents the combo of revered members, professional editorial assistance, and assurance of present and rising theories makes this e-book a vital source for knowing the evolution of the terranes constituting heart the USA.
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Additional info for Middle American Terranes, Potential Correlatives, and Orogenic Processes
14. 300 Ma reconstruction modified after Keppie and Ramos (1999) and Keppie et al. (2003b). Schouten and Klitgord (1994) suggested that the Maya terrane acted as an independently rotating microplate during the separation of North and South America. Given its rectangular shape, rhombochasms opened along its sides, whereas the corners became compressive zones. This is consistent with the wedge shape of the Gulf of Mexico (Marton and Buffler, 1994), and with the triangular shape of both the eastern Maya margin (Dickinson and Lawton, 2001), and the Juarez terrane (Fig.
2001). , 1990), and may be correlated with a similar event in the Acatlán Complex of southern Mexico. Subsequent separation of the Chortis terrane is possibly recorded in southern Mexico if the Xolapa Complex represents a continental rise prism of mid-Jurassic age as suggested by Ortega-Gutiérrez and ElíasHerrera (2003). Such a separation is consistent with the apparent absence in the Chortis terrane of the high-grade, Early Cretaceous tectonothermal event in the Xolapa Complex of southern Mexico.
DUNCAN KEPPIE FIG. 8. 600 Ma reconstruction modified after Keppie and Ramos (1999) and Keppie et al. (2003b). Abbreviations: Ca = Carolina; Cd = Cadomia; Ch = Chortis; D = Dalradia; EA = East Avalonia; F = Florida; I = Iberia; O = Oaxaquia; R = Rockall; WA = West Avalonia; Y = Yucatan. Barbed line is a subduction zone with teeth oriented toward the overriding slab; double line is a mid-ocean ridge, and single line is a transform fault. , 1994). Ortega-Gutiérrez and ElíasHerrera (2003) have traced the Xolapa Complex into the Jurassic rocks overstepping the Acatlán Complex, a discovery that acquits the Xolapa terrane.
Middle American Terranes, Potential Correlatives, and Orogenic Processes by J. Duncan Keppie, J. Brendan Murphy, F. Ortega-Gutierrez, W. G. Ernst