The Uplift History of the Precambrian Crystalline Basement of the Jabal J’alan (Sur Area)

Würsten, Felix; Flisch, Markus; Michalski, I.; Métour, J. Le; Mercolli, I.; Matthäus, Uwe; Peters, Tjerk

doi:10.1007/978-94-011-3358-6_30

Cited by 13 publications

(9 citation statements)

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“…Multiple mechanisms have been invoked to explain the Cenozoic exhumation and uplift in the Central Oman Mountains, including compression related to far‐field stresses of the Zagros collision (principally expressed in northern Oman) (Al‐Lazki et al, 2002; Mann et al, 1990; Mouthereau et al, 2012; Robertson & Searle, 1990) or a slowdown of Makran subduction to the east affecting central Oman (Hansmann et al, 2017). Low‐temperature thermochronometric data are broadly consistent with post‐obduction cooling below 100 °C regionally by ~40–30 Ma based on apatite fission track and (U‐Th)/He data ( Grobe et al, 2019 ; Hansman et al, 2017 ; Poupeau et al, 1998 ; Saddiqi et al, 2006; Würsten et al, ). For the purposes of this study, the timing of deformational events and regional cooling history are important context for interpreting the significance of the magnetite (U‐Th)/He data.…”

Section: Introductionsupporting

confidence: 55%

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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Section: Introductionsupporting

confidence: 55%

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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“…Gray et al () report late Oligocene to early Miocene cooling, with rates increasing toward the north of the mountains. The only other published study in the Oman sector of the Al Hajar Mountains include three AFT ages ranging from 146 to 30 Ma from Jabal Ja'Alan (Würsten et al, ), at the eastern end of the range (Figure ). These ages were interpreted to indicate a period of burial, followed by Oligocene cooling.…”

Section: Previous Thermochronologic Workmentioning

confidence: 99%

“…Cooling can also represent the dismembering of a previously acquired relief and therefore may be younger than the uplift event. Previous zircon and apatite fission track (ZFT and AFT) cooling ages have been interpreted to show either Miocene (Saddiqi et al, ) or Oligocene (Gray et al, ; Mount et al, ; Würsten et al, ) exhumation, cooling, and uplift of the Al Hajar Mountains. Most authors interpret this mountain uplift to be caused by far‐field stresses, originating from the Zagros collision (Ali et al, ; Fournier et al, ; Glennie et al, ; Nolan et al, ; Searle & Ali, ).…”

Section: Introductionmentioning

confidence: 99%

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

et al. 2017

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Uplift of the Al Hajar Mountains in Oman has been related to either Late Cretaceous ophiolite obduction or the Neogene Zagros collision. To test these hypotheses, the cooling of the central Al Hajar Mountains is constrained by 10 apatite (U‐Th)/He (AHe), 15 fission track (AFT), and four zircon (U‐Th)/He (ZHe) sample ages. These data show differential cooling between the two major structural culminations of the mountains. In the 3 km high Jabal Akhdar culmination AHe single‐grain ages range between 39 ± 2 Ma and 10 ± 1 Ma (2σ errors), AFT ages range from 51 ± 8 Ma to 32 ± 4 Ma, and ZHe single‐grain ages range from 62 ± 3 Ma to 39 ± 2 Ma. In the 2 km high Saih Hatat culmination AHe ages range from 26 ± 4 to 12 ± 4 Ma, AFT ages from 73 ± 19 Ma to 57 ± 8 Ma, and ZHe single‐grain ages from 81 ± 4 Ma to 58 ± 3 Ma. Thermal modeling demonstrates that cooling associated with uplift and erosion initiated at 40 Ma, indicating that uplift occurred 30 Myr after ophiolite obduction and at least 10 Myr before the Zagros collision. Therefore, this uplift cannot be related to either event. We propose that crustal thickening supporting the topography of the Al Hajar Mountains was caused by a slowdown of Makran subduction and that north Oman took up the residual fraction of N‐S convergence between Arabia and Eurasia.

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“…This implies post-mid Eocene uplift of the Oman Mountains to their current elevation (up to 3 km a.s.l). The precise timing and cause of the uplift is debated; suggestions for timing range from late Eocene to Oligocene (Würsten et al, 1991;Mount, Crawford and Bergman, 1998;Gray et al, 2006;Saddiqi et al, 2006;Hansman et al, 2017).…”

Section: Bandar Jissah Basin Northeastern Omanmentioning

confidence: 99%

Jurassic to Early Cretaceous basin configuration(s) in the Fingerdjupet Subbasin, SW Barents Sea

Serck

Faleide

Braathen

et al. 2017

Marine and Petroleum Geology

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This PhD thesis addresses how fault and fold growth affect accommodation development and sediment routing and fill in extensional basins. Extensional basins are key constituents of passive continental passive and intra-continental rift systems and hold great potential accumulation of reservoir-grade successions of sediments. These types of basins differ widely in terms of e.g. fault and fold properties, duration of faulting, accommodation development, tectono-climatic setting and lithology of basin substrate and fill. Accordingly, constructing general models for extensional basin evolution is challenging. Combining different types of datasets that offer different observation scale and resolution can mitigate this. This thesis presents seismic case studies from the Fingerdjupet Subbasin, southwestern Barents Sea and outcrop studies from the Bandar Jissah Basin, northeastern Oman. Seismic analyses include interpretations of faults and horizons bounding seismic reflector packages; age control was achieved

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The Uplift History of the Precambrian Crystalline Basement of the Jabal J’alan (Sur Area)

Cited by 13 publications

References 1 publication

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

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

Late Eocene Uplift of the Al Hajar Mountains, Oman, Supported by Stratigraphy and Low‐Temperature Thermochronology

Jurassic to Early Cretaceous basin configuration(s) in the Fingerdjupet Subbasin, SW Barents Sea

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