Les bassins d'avant-chaîne s'édifient au front des chaînes à la suite d'une flexion d... more Les bassins d'avant-chaîne s'édifient au front des chaînes à la suite d'une flexion de la lithosphère continentale. L'étude comparée de différents bassins permet de mettre en évidence les paramètres qui influent très étroitement sur leur évolution et leur géométri
Résumé/Abstract In the Plio-Pleistocene foreland basin of western Taiwan, synorogenic formations ... more Résumé/Abstract In the Plio-Pleistocene foreland basin of western Taiwan, synorogenic formations accumulated due to the uplift of the Central Range. Lithofacies and depositional environments vary from North to South along the western Foothills. To the North, shallow ...
Sequences of coral reef terraces characterized by staircase morphologies and a homogeneous lithol... more Sequences of coral reef terraces characterized by staircase morphologies and a homogeneous lithology make
them appropriate to isolate the influence of uplift on drainage morphology. Along the northern coast of Sumba
Island, Indonesia, we investigated the correlations between landscape morphology and uplift rates, which
range from 0.02 to 0.6 mm·yr−1
. We studied eight morphometric indices at two scales: whole island
(~11,000 km2
) and within sequences of reefal terraces (~3000 km2
). At the latter scale, we extracted morphometric
indices for 15 individual catchments draining mostly the reefal terraces and for 30 areas undergoing specific
ranges of uplift rates draining only the reefal terraces. Indices extracted from digital elevation models include
residual relief, incision, stream gradient indices (SL and ksn), the hypsometric integral, drainage area, mean relief,
and the shape factor. We find that SL, the hypsometric integral, mean relief and the shape factor of catchments
positively correlate with uplift rates, whereas incision, residual relief, and ksn do not. More precisely, we find
that only the areas that are uplifting at a rate faster than 0.3 mm·yr−1 can yield the extreme values for these indices,
implying that these extreme values are indicative of fast uplifting areas. However, the relationship is not
bivalent because any uplift rate can be associated with low values of the same indices. For all indices, the transient
conditions of the drainage influence the correlation with Pleistocene mean uplift rates, illustrating the necessity
to extract morphometric indices with an appropriate choice of catchment scale. This type of analysis helps to
identify the morphometric indices that are most useful for tectonic analysis in areas of unknown uplift, allowing
for easy identification of short spatial variations of uplift rate and detection of areas with relatively fast uplift rates
in unstudied coastal zones.
ABSTRACT Sequences of Plio-Quaternary shorelines generated by sea-level cyclicity and tectonics m... more ABSTRACT Sequences of Plio-Quaternary shorelines generated by sea-level cyclicity and tectonics massively shape the coasts worldwide. Here, we compile a worldwide synthesis of sea-level changes for the following highstands : MIS 1, MIS 3, MIS5e, and MIS 11 and explore the relationships to regional geodynamics. We identified 896 sequences including the MIS 5e benchmark, out of which 177 also feature the highest Holocene shorelines, 6 where the elevation of the MIS 3 shorelines are known, and 40 including that of MIS 11 shorelines. We considered 8 main geodynamical contexts for a statistical analysis: passive margin (337 sites, 14 domains, U=0.06 ± 0.01 mm/a), hot spot chains (45 sites, 14 domains, U=0.02 ± 0.02 mm/a), rifts (45 sites, 2 domains, U=0.12 ± 0.02 mm/a), ridges (3 sites, 1 domain, U=0.14 ± 0.02 mm/a), transform plate boundaries (119 sites, 7 domains, U=0.25 ± 0.03 mm/a), intra-oceanic subductions (131 sites, 4 domains, U=0.43 ± 0.04 mm/a), continental subductions underneath oceanic plates (12 sites, 1 domain, U=0.54+/- 0.04 mm/a), oceanic subductions underneath continental plates (166 sites, 7 domains, U=0.06 ± 0.01 mm/a), intra-continental convergence (10 sites, 2 domains, U=1.47 ± 0.08 mm/a). Counter-intuitive is the fact that passive margin are ubiquitously uplifting, while tectonic segmentation is more important on active margins. Additionally, 511 sites document the elevation of the highest shoreline of the sequence, from which we extrapolate a minimum age of onset for the sequence (based on MIS 5e uplift rates). 99% (511 sites) were formed at least during Pliocene and/or Quaternary, showing that potentially more ancient records are either eroded or non-existent.
Abstract: The aim of this contribution is to show the styles of growing anticlines and the ways i... more Abstract: The aim of this contribution is to show the styles of growing anticlines and the ways in which they accommodate oblique convergence through proximal foreland basins and intramontane basins. The four natural examples of individual fault-related-folds are: the ...
Les bassins d'avant-chaîne s'édifient au front des chaînes à la suite d'une flexion d... more Les bassins d'avant-chaîne s'édifient au front des chaînes à la suite d'une flexion de la lithosphère continentale. L'étude comparée de différents bassins permet de mettre en évidence les paramètres qui influent très étroitement sur leur évolution et leur géométri
Résumé/Abstract In the Plio-Pleistocene foreland basin of western Taiwan, synorogenic formations ... more Résumé/Abstract In the Plio-Pleistocene foreland basin of western Taiwan, synorogenic formations accumulated due to the uplift of the Central Range. Lithofacies and depositional environments vary from North to South along the western Foothills. To the North, shallow ...
Sequences of coral reef terraces characterized by staircase morphologies and a homogeneous lithol... more Sequences of coral reef terraces characterized by staircase morphologies and a homogeneous lithology make
them appropriate to isolate the influence of uplift on drainage morphology. Along the northern coast of Sumba
Island, Indonesia, we investigated the correlations between landscape morphology and uplift rates, which
range from 0.02 to 0.6 mm·yr−1
. We studied eight morphometric indices at two scales: whole island
(~11,000 km2
) and within sequences of reefal terraces (~3000 km2
). At the latter scale, we extracted morphometric
indices for 15 individual catchments draining mostly the reefal terraces and for 30 areas undergoing specific
ranges of uplift rates draining only the reefal terraces. Indices extracted from digital elevation models include
residual relief, incision, stream gradient indices (SL and ksn), the hypsometric integral, drainage area, mean relief,
and the shape factor. We find that SL, the hypsometric integral, mean relief and the shape factor of catchments
positively correlate with uplift rates, whereas incision, residual relief, and ksn do not. More precisely, we find
that only the areas that are uplifting at a rate faster than 0.3 mm·yr−1 can yield the extreme values for these indices,
implying that these extreme values are indicative of fast uplifting areas. However, the relationship is not
bivalent because any uplift rate can be associated with low values of the same indices. For all indices, the transient
conditions of the drainage influence the correlation with Pleistocene mean uplift rates, illustrating the necessity
to extract morphometric indices with an appropriate choice of catchment scale. This type of analysis helps to
identify the morphometric indices that are most useful for tectonic analysis in areas of unknown uplift, allowing
for easy identification of short spatial variations of uplift rate and detection of areas with relatively fast uplift rates
in unstudied coastal zones.
ABSTRACT Sequences of Plio-Quaternary shorelines generated by sea-level cyclicity and tectonics m... more ABSTRACT Sequences of Plio-Quaternary shorelines generated by sea-level cyclicity and tectonics massively shape the coasts worldwide. Here, we compile a worldwide synthesis of sea-level changes for the following highstands : MIS 1, MIS 3, MIS5e, and MIS 11 and explore the relationships to regional geodynamics. We identified 896 sequences including the MIS 5e benchmark, out of which 177 also feature the highest Holocene shorelines, 6 where the elevation of the MIS 3 shorelines are known, and 40 including that of MIS 11 shorelines. We considered 8 main geodynamical contexts for a statistical analysis: passive margin (337 sites, 14 domains, U=0.06 ± 0.01 mm/a), hot spot chains (45 sites, 14 domains, U=0.02 ± 0.02 mm/a), rifts (45 sites, 2 domains, U=0.12 ± 0.02 mm/a), ridges (3 sites, 1 domain, U=0.14 ± 0.02 mm/a), transform plate boundaries (119 sites, 7 domains, U=0.25 ± 0.03 mm/a), intra-oceanic subductions (131 sites, 4 domains, U=0.43 ± 0.04 mm/a), continental subductions underneath oceanic plates (12 sites, 1 domain, U=0.54+/- 0.04 mm/a), oceanic subductions underneath continental plates (166 sites, 7 domains, U=0.06 ± 0.01 mm/a), intra-continental convergence (10 sites, 2 domains, U=1.47 ± 0.08 mm/a). Counter-intuitive is the fact that passive margin are ubiquitously uplifting, while tectonic segmentation is more important on active margins. Additionally, 511 sites document the elevation of the highest shoreline of the sequence, from which we extrapolate a minimum age of onset for the sequence (based on MIS 5e uplift rates). 99% (511 sites) were formed at least during Pliocene and/or Quaternary, showing that potentially more ancient records are either eroded or non-existent.
Abstract: The aim of this contribution is to show the styles of growing anticlines and the ways i... more Abstract: The aim of this contribution is to show the styles of growing anticlines and the ways in which they accommodate oblique convergence through proximal foreland basins and intramontane basins. The four natural examples of individual fault-related-folds are: the ...
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Papers by B. Delcaillau
them appropriate to isolate the influence of uplift on drainage morphology. Along the northern coast of Sumba
Island, Indonesia, we investigated the correlations between landscape morphology and uplift rates, which
range from 0.02 to 0.6 mm·yr−1
. We studied eight morphometric indices at two scales: whole island
(~11,000 km2
) and within sequences of reefal terraces (~3000 km2
). At the latter scale, we extracted morphometric
indices for 15 individual catchments draining mostly the reefal terraces and for 30 areas undergoing specific
ranges of uplift rates draining only the reefal terraces. Indices extracted from digital elevation models include
residual relief, incision, stream gradient indices (SL and ksn), the hypsometric integral, drainage area, mean relief,
and the shape factor. We find that SL, the hypsometric integral, mean relief and the shape factor of catchments
positively correlate with uplift rates, whereas incision, residual relief, and ksn do not. More precisely, we find
that only the areas that are uplifting at a rate faster than 0.3 mm·yr−1 can yield the extreme values for these indices,
implying that these extreme values are indicative of fast uplifting areas. However, the relationship is not
bivalent because any uplift rate can be associated with low values of the same indices. For all indices, the transient
conditions of the drainage influence the correlation with Pleistocene mean uplift rates, illustrating the necessity
to extract morphometric indices with an appropriate choice of catchment scale. This type of analysis helps to
identify the morphometric indices that are most useful for tectonic analysis in areas of unknown uplift, allowing
for easy identification of short spatial variations of uplift rate and detection of areas with relatively fast uplift rates
in unstudied coastal zones.
them appropriate to isolate the influence of uplift on drainage morphology. Along the northern coast of Sumba
Island, Indonesia, we investigated the correlations between landscape morphology and uplift rates, which
range from 0.02 to 0.6 mm·yr−1
. We studied eight morphometric indices at two scales: whole island
(~11,000 km2
) and within sequences of reefal terraces (~3000 km2
). At the latter scale, we extracted morphometric
indices for 15 individual catchments draining mostly the reefal terraces and for 30 areas undergoing specific
ranges of uplift rates draining only the reefal terraces. Indices extracted from digital elevation models include
residual relief, incision, stream gradient indices (SL and ksn), the hypsometric integral, drainage area, mean relief,
and the shape factor. We find that SL, the hypsometric integral, mean relief and the shape factor of catchments
positively correlate with uplift rates, whereas incision, residual relief, and ksn do not. More precisely, we find
that only the areas that are uplifting at a rate faster than 0.3 mm·yr−1 can yield the extreme values for these indices,
implying that these extreme values are indicative of fast uplifting areas. However, the relationship is not
bivalent because any uplift rate can be associated with low values of the same indices. For all indices, the transient
conditions of the drainage influence the correlation with Pleistocene mean uplift rates, illustrating the necessity
to extract morphometric indices with an appropriate choice of catchment scale. This type of analysis helps to
identify the morphometric indices that are most useful for tectonic analysis in areas of unknown uplift, allowing
for easy identification of short spatial variations of uplift rate and detection of areas with relatively fast uplift rates
in unstudied coastal zones.