Permian Brachiopods from Oman

Yanagida, Juichi; Pillevuit, Alain

doi:10.5109/1543652

Cited by 3 publications

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“…Thi early Permian magmatic event i interpreted as the first sign of the Neotethyan rifting in Oman. We correlate this very thin horizon of pillow lava with the kilometre thick lava deposits of the Saih Hatat (Le Metour, 1988;Bechennec ef al., 1991), that locally comprises an early Permian brachiopod fauna Yanagida & Pillevuit, 1994) and a WPB geochemical ignature (Le Metour, 1988; Bechennec et al, 1991;Rabu et 01., 1993). --------------, A similar edimentary succession is observed in the Haushi-Huqf area.…”

Section: The Rann Formationmentioning

confidence: 99%

The Oman Exotics: a key to the understanding of the Neotethyan geodynamic evolution

Pillevuit¹,

Marcoux²,

Stampfli³

et al. 1997

Geodinamica Acta

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The study of the exotic blocks of the Hawasina Nappes (Sultanate of Oman) leads to give apposit data that allow us to propose a new paleogeo.graphic e~~lut~on of the Oman margin in time and space. A revised~lasSlfl~al1o.n of exotic blocks into different paleogeographical UnIts IS presented. Two newly introduced stratigraphic groups, the Ramaq Group (Ordovician to Triassic) and the AI Buda'ah Group (upper Permian to Jurassic) are interpreted as tilted blocks related to the Oman continental margin. The Kawr Group (middle Triassic to Cretaceous) is redefined and interpreted as an atoll-type seamount. The paleogeography and paleoenvironments of these units are integrated into a new scheme of the Neotethyan rifting history. Brecciae and olistoliths of the Hawasina series are interpreted to have originated from tectonic movements affecting the Oman margin and the Neotethyan ocean floor. The breccias of late Permian age were generated by the extension processes affecting the margin, a.nd by the creation of the Neotethyan oceanic floor. The breCCIas of mid-late Triassic age coincide in time with the collision of the Cimmerian continents with Eurasia. In constrast, the breccias of late Jurassic and Cretaceous age are interpreted as resulting to the creation of a new oceanic crust (Semail) off the Oman margin.

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Section: The Rann Formationmentioning

confidence: 99%

The Oman Exotics: a key to the understanding of the Neotethyan geodynamic evolution

Pillevuit¹,

Marcoux²,

Stampfli³

et al. 1997

Geodinamica Acta

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“…Hence, it seems reasonable to claim that the PAMAM dendrimer monolayer was successfully transferred from the water surface onto the solid substrate. The step height of the scratched area by an AFM tip was approximately 1.4 nm, as shown in the panel of b, which was smaller than a hypothetical radius of a PAMAM molecule with a circular conformation deduced by MD simulation . This means that the PAMAM molecules transferred onto the solid substrate are in an oblate shape .…”

Section: Resultsmentioning

confidence: 81%

“…According to molecular dynamics (MD) calculation, the PAMAM molecule was in a flattened conformation on the water surface and its projected area was in the range of 7.1-9.6 nm 2 ‚molecule -1 . 29 Hence, it is plausible that a PAMAM molecule sits on the water surface with not spherical but oblate shape. The core of the PAMAM molecule including focal point is hydrophilic, and thus, attracts to the water surface.…”

Section: Resultsmentioning

confidence: 99%

“…The step height of the scratched area by an AFM tip was approximately 1.4 nm, as shown in the panel of b, which was smaller than a hypothetical radius of a PAMAM molecule with a circular conformation deduced by MD simulation. 29 This means that the PAMAM molecules transferred onto the solid substrate are in an oblate shape. 31 On the other hand, in the PAMAM monolayer transferred at π ) 30 mN‚m -1 , a mottled surface morphology was observed, as shown in part c. White and dark regions correspond to higher and lower regions in height, respectively.…”

Section: Resultsmentioning

confidence: 99%

“…Invoking that this notion can be simply extended to monolayers in a liquid expanded state, the size of a PAMAM molecule at the air/water interface was deduced to be 7.8 nm 2 ·molecule -1 , as shown in Figure . According to molecular dynamics (MD) calculation, the PAMAM molecule was in a flattened conformation on the water surface and its projected area was in the range of 7.1−9.6 nm 2 ·molecule -1 . Hence, it is plausible that a PAMAM molecule sits on the water surface with not spherical but oblate shape.…”

Section: Resultsmentioning

confidence: 99%

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Aggregation States and Molecular Motion in Amphiphilic Poly(amido amine) Dendrimer Monolayers on Solid Substrates

et al. 2003

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Monolayers of third-generation amphiphilic poly(amido amine) (PAMAM) dendrimer were prepared at the air/water interface and then were successfully transferred onto silicon wafers by a horizontal lifting method. A comprehensive characterization of the PAMAM monolayers was made, structurally and dynamically, by scanning force microscopy in conjunction with X-ray reflectivity and X-ray photoelectron spectroscopy. The PAMAM molecules sit on the substrate with an oblate shape, in which hydrophilic core and hydrophobic alkyl end groups were toward substrate and air sides, respectively. In the PAMAM monolayers, distinct three, Ra-, RH 2 O-and δ-, relaxation processes were observed on lateral force-temperature curves. They were assigned to segmental motion, plasticized segmental motion by residual water molecules, and a local mode relaxation, respectively.

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Palaeobiogeographic implications of Middle Permian brachiopods from Johore (Peninsular Malaysia)

2003

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A new Middle Permian locality in northern Johore, Peninsular Malaysia, yields a small-sized, but compositionally unique, brachiopod fauna consisting of eight species: Pseudoleptodus sp., Caricula cf. salebrosa Grant, Neochonetes (Nongtaia) aff. arabicus (Hudson & Sudbury), Karavankina sp., Transennatia cf. insculpta (Grant), Hustedia sp., Orthothetina sp., and martiniid indet. The first four genera are new records for Malaysia; in particular, the rare taxa Pseudoleptodus and Caricula characterize the fauna. The brachiopods occur together with the ammonoid Agathiceras sp., the nautiloid Foordiceras? sp., bivalves, and crinoid stems. The locality belongs to the East Malaya terrane of the Cathaysian biotic region, but some affinities to species of the Sibumasu province are recognized. The Malaysian forms of Pseudoleptodus, Caricula and Transennatia are similar to those of the Ratburi Limestone (southern Thailand). A Roadian–early Wordian age is interpreted for the Johore fauna. The similarity of brachiopods reported here with those from the Ratburi Limestone suggests that there was species interchange or one-way migration between shallow waters of East Malaya and Sibumasu across the main Palaeo-Tethys. The Tethyan seaway between the two terranes must have been narrower than previously interpreted by some authors to allow such faunal traffic during the Roadian–Wordian time period.

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Permian Brachiopods from Oman

Cited by 3 publications

References 0 publications

The Oman Exotics: a key to the understanding of the Neotethyan geodynamic evolution

The Oman Exotics: a key to the understanding of the Neotethyan geodynamic evolution

Aggregation States and Molecular Motion in Amphiphilic Poly(amido amine) Dendrimer Monolayers on Solid Substrates

Palaeobiogeographic implications of Middle Permian brachiopods from Johore (Peninsular Malaysia)

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