Terra Nova

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Neoproterozoic cap carbonates: a critical appraisal of existing models and the plumeworld hypothesis
Terra Nova - Tập 17 Số 4 - Trang 299-310 - 2005
Graham Shields
AbstractEvidence for glaciation during the mid‐late Neoproterozoic is widespread on Earth, reflecting three or more ice ages between 730 Ma and 580 Ma. Of these, the late Neoproterozoic Marinoan glaciation of approximately 635 Ma stands out because of its ubiquitous association with a characteristic, microcrystalline cap dolostone that drapes glacially influenced rock units worldwide. The Marinoan... hiện toàn bộ
The snowball Earth hypothesis: testing the limits of global change
Terra Nova - Tập 14 Số 3 - Trang 129-155 - 2002
Paul F. Hoffman, Daniel P. Schrag
The gradual discovery that late Neoproterozoic ice sheets extended to sea level near the equator poses a palaeoenvironmental conundrum. Was the Earth's orbital obliquity > 60° (making the tropics colder than the poles) for 4.0 billion years following the lunar‐forming impact, or did climate cool globally for some reason to the point at which runaway ice‐albedo feedback created a `snowball' Earth? ... hiện toàn bộ
Giant sandstone pipes record basin‐scale liquefaction of buried dune sands in the Middle Jurassic of SE Utah
Terra Nova - Tập 17 Số 1 - Trang 80-85 - 2005
Mads Huuse, Simon J. Shoulders, Dennis I. Netoff, Joe Cartwright
AbstractGiant sandstone pipes crop out over a 20 000 km2 area of SE Utah. They range from metres to decametres in diameter and crosscut more than 100 m of continental sediments. New and published observations, encompassing all known pipe localities in SE Utah, suggest that the pipes formed by upward movement of groundwater, sand and sediment blocks in response to liquefaction of buried dune sands.... hiện toàn bộ
Multidisciplinary inferences on a newly recognized active east‐dipping extensional system in Central Italy
Terra Nova - Tập 29 Số 1 - Trang 77-89 - 2017
Giusy Lavecchia, Guido Maria Adinolfi, Rita de Nardis, Federica Ferrarini, Daniele Cirillo, Francesco Brozzetti, Raffaella De Matteis, Gaetano Festa, Aldo Zollo
AbstractWe use a multidisciplinary approach to gather preliminary evidence for a Quaternary east‐dipping extensional detachment in Central Italy. This structure crops out in the Sabini‐Eastern Simbruini (SES) and would be hidden at mid‐crustal depths beneath the L'Aquila 2009 (Mw6.3) epicentral area. TheSESgeometry is reconstructed through geological mapping, structural analysis and seismic line i... hiện toàn bộ
Deciphering tectonic‐ and erosion‐driven exhumation of the Nevado–Filábride Complex (Betic Cordillera, Southern Spain) by low temperature thermochronology
Terra Nova - Tập 23 Số 4 - Trang 257-263 - 2011
Mercedes Vázquez-Vílchez, A. Jabaloy, L. Barbero, Finlay M. Stuart
Terra Nova, 23, 257–263, 2011AbstractNew apatite (U‐Th)/He and fission‐track data from the Nevado–Filábride complex in the Sierra Nevada of southern Spain are used to constrain the Neogene exhumation history. Apatite (U‐Th)/He ages are close to fission‐track ages in western Sierra Nevada indicating that rapid cooling occurred at 8–6 Ma, consistent with exhumation due to extension along the Mecina ... hiện toàn bộ
Depth and modes of Pliocene–Pleistocene crustal extension of the Apennines (Italy)
Terra Nova - Tập 11 Số 2-3 - Trang 67-72 - 1999
F. Ghisetti, Livio Vezzani
Since early Pliocene times the Apenninic chain has been dissected by normal faults propagating towards the Adriatic foreland. In the Tyrrhenian Sea extension involved deep crustal sections, whereas in the ‘Central Apennines Downfaulted Area’ it affected the shallow crust. The Tyrrhenian back‐arc domain is connected to the overall flexural retreat of the Adriatic–Apulia plate in front of the Apenni... hiện toàn bộ
Evidence for surface rupture associated with the Mw 6.3 L’Aquila earthquake sequence of April 2009 (central Italy)
Terra Nova - Tập 22 Số 1 - Trang 43-51 - 2010
Coastal uplift rate at Matanzas (Cuba) inferred from MIS5e phreatic overgrowths on speleothems
Terra Nova - Tập 29 Số 2 - Trang 98-105 - 2017
Jo De Waele, Ilenia M. D’Angeli, Nicola Tisato, Paola Tuccimei, Michele Soligo, Joaquín Ginés, Àngel Ginés, Joan J. Fornós, Igor M. Villa, Esteban R. Grau González, Stefano M. Bernasconi, Tomaso R. R. Bontognali
AbstractMany morphological elements in Cuba's landscape (e.g. marine terraces, tidal notches) demonstrate that coastal uplift has taken place, but the rate at which this occurs is not known. Carbonate phreatic overgrowths on speleothems have been found in a cave in Central North Cuba, ~1 km from the present coastline at 16 m asl. They form exceptional and unique mushroom‐shaped speleothems and bal... hiện toàn bộ
Thermal structure of a fossil subduction wedge in the Western Alps
Terra Nova - Tập 21 Số 1 - Trang 28-34 - 2009
Sunsearé Gabalda, Olivier Beyssac, Laurent Jolivet, Philippe Agard, Christian Chopin
AbstractNew peak metamorphic temperatures are obtained by Raman spectroscopy of Carbonaceous Material to document the thermal structure of the central Western Alps with high sampling resolution. We show that peak metamorphic T gradually increases eastward from <330 to 350 °C (ultra‐Dauphinois to subbriançonnais units), ∼350 to more than 400 °C (Briançonnais domain including the Zone Houillère wher... hiện toàn bộ
The Zermatt‐Saas ophiolite: the largest (60‐km wide) and deepest (c. 70–80 km) continuous slice of oceanic lithosphere detached from a subduction zone?
Terra Nova - Tập 21 Số 3 - Trang 171-180 - 2009
Samuel Angiboust, P. Agard, Laëtitia Le Pourhiet, Olivier Beyssac
AbstractThe Western Alps are a classic subduction‐related collisional orogen with well‐preserved, deeply subducted ophiolitic remnants of oceanic lithosphere. Some (e.g. Monviso, Voltri) were recognized as a palaeo‐subduction channel, with tectonic blocks showing a wide range of pressure–temperature conditions. We herein evaluate for the first time the metamorphic homogeneity of the extensive Zerm... hiện toàn bộ
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