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Lemptegy

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Journal Article
Journal: Geosphere
Published: 01 October 2014
Geosphere (2014) 10 (5): 998-1019.
...Audray Delcamp; Benjamin van Wyk de Vries; Petit Stéphane; Matthieu Kervyn Abstract The monogenetic Lemptégy volcano in the Chaîne des Puys (Auvergne, France) was quarried from 1946 to 2007 and offers the possibility to study scoria cone architecture and evolution. This volcano was originally 50–80...
FIGURES | View All (15)
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(A) Shaded relied image and geological context of <b>Lemptégy</b> volcano in the C...
in > Geosphere
Published: 01 October 2014
Figure 1. (A) Shaded relied image and geological context of Lemptégy volcano in the Chaîne des Puys, France. (B) Lemptégy quarry and nearby Puy Chopine and Puy des Gouttes volcanoes (Google Earth). (C) Lemptégy quarry with Lemptégy 1 and Lemptégy 2 eruptive centers (photo: N. Vidal). A small
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Panoramic overview of <b>Lemptégy</b> 1 extrusive and plumbing system (picture: S....
in > Geosphere
Published: 01 October 2014
Figure 2. Panoramic overview of Lemptégy 1 extrusive and plumbing system (picture: S. Quattocchi; www.auvergne-volcan.com ). D1 stand for dike 1 and so on. Locations of outcrops on Figure 4 are displayed as Figs. 4A, 4B, and 4C . Note that the thicknesses and orientations are biased due
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Geological and structural map of <b>Lemptégy</b>; light detection and ranging (LiD...
in > Geosphere
Published: 01 October 2014
Figure 3. Geological and structural map of Lemptégy; light detection and ranging (LiDAR) image generated by S. Petit.
Image
Overview of <b>Lemptégy</b> 1 plumbing system with the links among the dike intrus...
in > Geosphere
Published: 01 October 2014
Figure 5. Overview of Lemptégy 1 plumbing system with the links among the dike intrusion, faults, and uplift of the Puy des Gouttes and Lemptégy 1 deposit. The uplift demonstrates the late emplacement of dikes 3 and 4. Note the flower structure associated with dike 3 and the N000° fault. Trees
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Sequential maps of the evolution of <b>Lemptégy</b> 1. (A) Formation of Puy de Gou...
in > Geosphere
Published: 01 October 2014
Figure 6. Sequential maps of the evolution of Lemptégy 1. (A) Formation of Puy de Gouttes, and initiation of a fracture line at its base as the Lemptégy 1 feeder dike arrives near the surface. (B) Eruption of Lemptégy 1 formed two or more vents, with a lava flow directed southeastward (seen
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Stratigraphy reconstruction of <b>Lemptégy</b> 2. The largest picture shows an ove...
in > Geosphere
Published: 01 October 2014
Figure 8. Stratigraphy reconstruction of Lemptégy 2. The largest picture shows an overview of the Lemptégy 2 deposits looking toward Lemptégy 1, and the small pictures are close-ups of the stratigraphic sequences.
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A sequential reconstruction of <b>Lemptégy</b> 2 phases (see text for details).
in > Geosphere
Published: 01 October 2014
Figure 9. A sequential reconstruction of Lemptégy 2 phases (see text for details).
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Images of the early-formed structures of <b>Lemptégy</b> 2, with spatter cones and...
in > Geosphere
Published: 01 October 2014
Figure 10. Images of the early-formed structures of Lemptégy 2, with spatter cones and spatter-fed flows, to a more-evolved system, with eruptive fissure.
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Mature <b>Lemptégy</b> 2 conduit system with an enlarged Vulcanian conduit and ass...
in > Geosphere
Published: 01 October 2014
Figure 11. Mature Lemptégy 2 conduit system with an enlarged Vulcanian conduit and associated bombs. The large bombs are probably parts of the magma conduit cap, disrupted by explosions. Parts of these are found on the flank deposits as prismatic bombs, amongst a rounded scoria deposit.
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Intrusion morphologies observed at <b>Lemptégy</b> 2. (A) Thin dike tapering to a ...
in > Geosphere
Published: 01 October 2014
Figure 12. Intrusion morphologies observed at Lemptégy 2. (A) Thin dike tapering to a point at the top of the image. The central part is vesiculated, while the margins are massive and contain sheared fabrics. (B) Thick dike cored by massive rock and covered by a breccia carapace. (C) Sketch
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Micro- and macrostructures that are commonly found along <b>Lemptégy</b> dikes. Th...
in > Geosphere
Published: 01 October 2014
Figure 13. Micro- and macrostructures that are commonly found along Lemptégy dikes. Those structures give indications of magma flow directions. Figure is adapted from Petronis et al. (2013) .
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(A) Spatial and structural relationships between <b>Lemptégy</b> 1 and 2 systems. ...
in > Geosphere
Published: 01 October 2014
Figure 14. (A) Spatial and structural relationships between Lemptégy 1 and 2 systems. (B) Relationship between collapse and diking at Lemptégy 2. The half-cup–like dike results from the partial collapse of Lemptégy 2. Picture is about 50 m wide.
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Shallow and deeper intrusive system below <b>Lemptégy</b>–Puy des Gouttes–Puy de C...
in > Geosphere
Published: 01 October 2014
Figure 15. Shallow and deeper intrusive system below Lemptégy–Puy des Gouttes–Puy de Chopine–Puy de la Coquille et Jumes alignment. Structures that are observed are in black, and the structures in gray are deduced from observations. The alignment of the volcanoes is localized above a NE-SW
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COMPARATIVE TABLE OF INTRUSIVE AND ERUPTIVE ACTIVITIES OBSERVED AT <b>LEMPTÉGY</b>...
in > Geosphere
Published: 01 October 2014
TABLE 3. COMPARATIVE TABLE OF INTRUSIVE AND ERUPTIVE ACTIVITIES OBSERVED AT LEMPTÉGY AND OBSERVED DURING HISTORICAL ERUPTIONS OR AT OTHER EXCAVATED CONES
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The small insets at each picture corner display the location of the outcrop...
in > Geosphere
Published: 01 October 2014
Fig. 2 ). (B) Contacts and relationships between Lemptégy 1, Puy des Gouttes (P.d. Gouttes), Lemptégy 2, Puy de Côme (P.d. Côme), and Puy de Chopine (P.d. Chopine) deposits. Note the flower structure with grabens and horst within the deposits associated with the fault N000° and dike 3 in Figures 2
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(A) Total alkali-silica (TAS) diagram ( Le Maitre et al., 2002 ). The data ...
in > Geosphere
Published: 01 October 2014
Figure 7. (A) Total alkali-silica (TAS) diagram ( Le Maitre et al., 2002 ). The data can be found in Table 1 ( Wallecan, 2011 ). The arrow shows the slight change of chemistry from lower to upper units defined in B. (B) Log from where Lemptégy 2 stratigraphy has been established (7 units and 3
Journal Article
Journal: Geosphere
Published: 01 June 2016
Geosphere (2016) 12 (3): 842-866.
FIGURES | View All (14)