Jabal Hafit anticline (UAE and Oman) formed by décollement folding followed by trishear fault-propagation folding

Hansman, Reuben J.; Ring, Uwe

doi:10.1016/j.jsg.2018.09.014

Cited by 23 publications

(21 citation statements)

References 39 publications

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“… From the latest Eocene onward, the margin turns into a relatively quiescent continental margin, until compression resumes in the region during the Miocene, as a result of collision in the Zagros orogen (Agard et al., 2020; Coradetti et al., 2019; Hansman & Ring 2018). …”

Section: Discussionmentioning

confidence: 99%

“…This is consistent with the existence, onshore, of a major hiatus and unconformity (Figure 3) Journal of Geophysical Research: Solid Earth 5.4.5. Post-obduction (9) From the latest Eocene onward, the margin turns into a relatively quiescent continental margin, until compression resumes in the region during the Miocene, as a result of collision in the Zagros orogen (Agard et al, 2020;Coradetti et al, 2019;Hansman & Ring 2018).…”

Section: Early Obduction (Figuresmentioning

confidence: 99%

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Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Section: Early Obduction (Figuresmentioning

confidence: 99%

Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

et al. 2021

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“…9B and 10). This model supplements a larger-scale 3-D geological model of the entire Jabal Hafit anticline (Hansman and Ring, 2018), which was created from ground-based field mapping to quantify the amount of horizontal shortening and the deformation style. A significant advantage that the photo-based 3-D reconstruction provided was the high-resolution DEM.…”

Section: ■ Results and Discussionmentioning

confidence: 99%

“…The structure consists of carbonate rocks of early Eocene to middle Miocene age, which have been folded, uplifted, and exposed at the surface through erosion (Warrak, 1987). The subsurface geometry of the Jabal Hafit anticline was previously described with a 3-D geological model that was constrained through detailed mapping and seismic data (Hansman and Ring, 2018). For these reasons (excellent geology exposure and rugged terrain), the Jabal Hafit anticline is an ideal locality for RPA photo-based 3-D reconstruction mapping.…”

Section: ■ Mapping Areamentioning

confidence: 99%

Workflow: From photo-based 3-D reconstruction of remotely piloted aircraft images to a 3-D geological model

Hansman

Ring

2019

Geosphere

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Geological field mapping is a vital first step in understanding geological processes. During the 20th century, mapping was revolutionized through advances in remote sensing technology. With the recent availability of low-cost remotely piloted aircraft (RPA), field geologists now routinely carry out aerial imaging without the need to use satellite, helicopter, or airplane systems. RPA photographs are processed by photo-based three-dimensional (3-D) reconstruction software, which uses structure-from-motion and multi-view stereo algorithms to create an ultra-high-resolution, 3-D point cloud of a region or target outcrop. These point clouds are analyzed to extract the orientation of geological structures and strata, and are also used to create digital elevation models and photorealistic 3-D models. However, this technique has only recently been used for structural mapping. Here, we outline a workflow starting with RPA data acquisition, followed by photo-based 3-D reconstruction, and ending with a 3-D geological model. The Jabal Hafit anticline in the United Arab Emirates was selected to demonstrate this workflow. At this anticline, outcrop exposure is excellent and the terrain is challenging to navigate due to areas of high relief. This makes for an ideal RPA mapping site and provides a good indication of how practical this method may be for the field geologist. Results confirm that RPA photo-based 3-D reconstruction mapping is an accurate and cost-efficient remote sensing method for geological mapping.

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“…Similarly, apatite (U‐Th)/He on samples from outside the culminations have ages from 17–6 Ma (Hansman et al, 2017 ) . The cooling recorded by apatite (U‐Th)/He since 30 Ma appears to be linked to Oligo‐Miocene surface uplift due to NE–SW shortening (Hansman et al, 2017; Hansman & Ring, 2018), and temporally coincides with the main phases of Zagros collision and rapid propagation of deformation and flexural loading of the Arabian plate (Barber et al, 2018 ; Mouthereau et al, 2012). The apatite (U‐Th)/He ages overlap with our magnetite (U‐Th)/He data from Wadi Fins.…”

Section: Discussionmentioning

confidence: 99%

Timing of Magnetite Growth Associated With Peridotite‐Hosted Carbonate Veins in the SE Samail Ophiolite, Wadi Fins, Oman

et al. 2020

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Carbonate‐altered peridotite are common in continental and oceanic settings and it has been suggested that peridotite‐hosted carbonate represent a significant component of the carbon‐cycle and provide an important link in the CO2 dynamics between the atmosphere, hydrosphere, and lithosphere. The ability to constrain the timing of carbonate and accessory phase growth is key to interpreting the mechanisms that contribute to carbonate alteration, veining, and mineralization in ultramafic rocks. Here we examine a mantle section of the Samail ophiolite exposed in Wadi Fins in southeastern Oman where the peridotite is unconformably overlain by Late Cretaceous‐Paleogene limestone and crosscut by an extensive network of carbonate veins and fracture‐controlled alteration. Three previous 87Sr/86Sr measurements on carbonate vein material in the peridotite produce results consistent with vein formation involving Cretaceous to Eocene seawater (de Obeso & Kelemen, 2018, https://doi.org/10.1098/rsta.2018.0433). We employ (U‐Th)/He chronometry to constrain the timing of hydrothermal magnetite in the calcite veins in the peridotite. Magnetite (U‐Th)/He ages of crystal sizes ranging from 1 cm to 200 μm record Miocene growth at 15 ± 4 Ma, which may indicate (1) fluid–rock interaction and carbonate precipitation in the Miocene, or (2) magnetite (re)crystallization within pre‐existing veins. Taken together with published Sr‐isotope values, these results suggest that carbonate veining at Wadi Fins started as early as the Cretaceous, and continued in the Miocene associated with magnetite growth. The timing of hydrothermal magnetite growth is coeval with Neogene shortening and faulting in southern Oman, which points to a tectonic driver for vein (re)opening and fluid‐rock alteration.

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Jabal Hafit anticline (UAE and Oman) formed by décollement folding followed by trishear fault-propagation folding

Cited by 23 publications

References 39 publications

Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

Structure of the Offshore Obducted Oman Margin: Emplacement of Semail Ophiolite and Role of Tectonic Inheritance

Workflow: From photo-based 3-D reconstruction of remotely piloted aircraft images to a 3-D geological model

Timing of Magnetite Growth Associated With Peridotite‐Hosted Carbonate Veins in the SE Samail Ophiolite, Wadi Fins, Oman

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