Neptunian dykes and associated features in southern Spain: mechanics of formation and tectonic implications

Molina, José Miguel; Ruiz-Ortiz, P. A.; Vera, Jesús

doi:10.1111/j.1365-3091.1995.tb00420.x

Cited by 14 publications

(7 citation statements)

References 16 publications

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“…For example, structures interpreted by Vera et al . (1988 ) and Molina et al . (1995 ) as karstic dissolution features that later were filled with marine sediment in a submarine environment, and used by them as evidence of a widespread sea‐level lowstand in the Jurassic of the Betic Cordillera (Spain), have been interpreted as tensional cracks associated with submarine sliding by Winterer & Sarti (1994, 1995).…”

Section: Introductionmentioning

confidence: 95%

Synsedimentary tensional features in Upper Triassic shallow‐water platform carbonates of the Carnian Prealps (northern Italy) and their importance as palaeostress indicators

Cozzi

2000

Basin Research

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The extensive shallow‐water carbonate platform deposits of the Dolomia Principale Formation (Southern Alps, northern Italy) accumulated during the Late Triassic, a time of plate‐scale reorganization and rifting. Synsedimentary tensional features such as fractures, neptunian dykes, normal faults, shatter breccias and laterally discordant intraformational breccias have been studied within a well‐preserved platform‐to‐basin transition in the Monte Pramaggiore area (Carnian Prealps). These tensional features follow three preferential orientations: N–S, E–W and NE–SW. To fully explain these different arrays it is proposed that the study area experienced during the Late Triassic the waning rifting phase connected to the westward propagation of the NeoTethys (N–S extension) and the onset of the rifting phase that led in the Middle Jurassic to the opening of the Central Atlantic (E–W extension), with a contemporaneous reactivation of Early–Middle Triassic NE–SW‐orientated faults. This palaeostress analysis reveals the good potential of tensional features as reliable palaeostress indicators.

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Section: Introductionmentioning

confidence: 95%

Synsedimentary tensional features in Upper Triassic shallow‐water platform carbonates of the Carnian Prealps (northern Italy) and their importance as palaeostress indicators

Cozzi

2000

Basin Research

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“…The formation of such fissures is interpreted as an effect of: (1) depositional processes, (2) synsedimentary features, (3) diagenetic transformations of sediments, and, above all, (4) extensional tectonics in the sedimentary basin (see e.g., Land and Goreau 1970;Wendt 1971;Smart et al 1988;Martire 1996;Winterer et al 1991;Santantonio 1993;Winterer and Sarti 1994;Molina et al 1995;Wieczorek and Olszewska 2001;Łuczyński 2001;Flügel 2004;Wall and Jenkyns 2004;Črne et al 2007;Montenat et al 2007;Kandemir and Yilmaz 2009;Kołodziej et al 2010;Reolid and Molina 2010;Nieto et al 2012;Barski 2012).…”

Section: Introductionmentioning

confidence: 99%

Oxfordian neptunian dykes with brachiopods from the southern part of the Kraków-Częstochowa Upland (southern Poland) and their links to hydrothermal vents

Matyszkiewicz

Krajewski

Kochman

et al. 2016

Facies

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Then, in the Cretaceous, and primarily in the Cenozoic, tectonic discontinuities filled with neptunian dykes were penetrated by karst waters and by hydrothermal solutions, which partly silicified the carbonate material infilling the dykes. The formation of dykes is genetically related to the Late Jurassic, Pan-European stress-field reorganization caused by the opening of the Northern Atlantic and Tethys Oceans.

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“…Neptunian dykes are indicative of synsedimentary tectonics, probably related to tensional deformation systems (e.g., Molina et al 1995;Martire and Pavia 2004;Crne et al 2007;Basilone 2009;Bertok and Martire 2009). According to Ziegler (1989), the Middle-Late Jurassic transition was a tectonically active period with a change from extensional to transtensional conditions in the Western Tethys.…”

Section: Synsedimentary Tectonicsmentioning

confidence: 99%

Evolution of pelagic swells from hardground analysis (Bathonian–Oxfordian, Eastern External Subbetic, southern Spain)

Nieto

Reolid

Molina

et al. 2011

Facies

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The Middle Bathonian to Middle Oxfordian interval in the Eastern External Subbetic (Betic Cordillera, SE Spain) is characterized by Ammonitico Rosso facies including various stratigraphic breaks. Five hardgroundbounded units are recognized in relation to hiatuses in the ammonite record at the following stratigraphic boundaries: Hg1 (Lower-Middle Bathonian), Hg2 (Middle-Upper Bathonian), Hg3 (Lower-Middle Callovian), Hg4 (MiddleUpper Callovian), and Hg5 (Callovian-Oxfordian). Interesting features of these hardgrounds include their microfacies, ferruginous crusts and macro-oncoids, taphonomy of macroinvertebrates, trace fossils, neptunian dykes, and the hiatuses associated with each of them. The main hardgrounds (Hg1, Hg2, and Hg5) contain trace fossils of the Cruziana and Trypanites ichnofacies as well as abundant fossil macroinvertebrates with taphonomic features evidencing corrasion, early diagenesis, and reworking, indicating substrate evolution from softground to hardground. Neptunian dykes aVected the trace fossils and ammonoid moulds, and their walls and the hardground surfaces were colonized by ferruginous microbial crusts. These features are characteristic of the External Subbetic pelagic swells, where the absence of sedimentation, sediment bypassing and erosion, and early diagenesis during relative sea-level falls produced hardgrounds. The neptunian dykes are indicative of tectonic activity in the areas of pelagic swells.Ferruginous crusts and macro-oncoids developed only on hardground surfaces and neptunian dykes walls prior to deposition of condensed bioclastic beds, which are interpreted as the Wrst deposits after hardground development and are related to the onset of transgression. The varying ranges of the gaps as well as lateral facies changes are related to diVerent local paleobathymetry controlled by the activity of listric faults.

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Neptunian dykes and associated features in southern Spain: mechanics of formation and tectonic implications

Cited by 14 publications

References 16 publications

Synsedimentary tensional features in Upper Triassic shallow‐water platform carbonates of the Carnian Prealps (northern Italy) and their importance as palaeostress indicators

Synsedimentary tensional features in Upper Triassic shallow‐water platform carbonates of the Carnian Prealps (northern Italy) and their importance as palaeostress indicators

Oxfordian neptunian dykes with brachiopods from the southern part of the Kraków-Częstochowa Upland (southern Poland) and their links to hydrothermal vents

Evolution of pelagic swells from hardground analysis (Bathonian–Oxfordian, Eastern External Subbetic, southern Spain)

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