The present data in brief article provides additional data and information to our research articl... more The present data in brief article provides additional data and information to our research article "Micro- and nanostructures reflect the degree of diagenetic alteration in modern and fossil brachiopod shell calcite: a multi-analytical screening approach (CL, FE-SEM, AFM, EBSD)" [1] (Casella et al.). We present fibre morphology, nano- and microstructure, as well as calcite crystal orientations and textures found in pristine, experimentally altered (hydrothermal and thermal), and diagenetically overprinted brachiopod shells. Combination of the screening tools AFM, FE-SEM, and EBSD allows to observe a significant change in microstructural and textural features with an increasing degree of laboratory-based and naturally occurring diagenetic alteration. Amalgamation of neighbouring fibres was observed on the micrometre scale level, whereas progressive decomposition of biopolymers in the shells and fusion of nanoparticulate calcite crystals was detected on the nanometre scale. ...
... an upward thinning sediment body (or package) deposited seaward of the ice-grounding line dur... more ... an upward thinning sediment body (or package) deposited seaward of the ice-grounding line during a major recessional phase of a marine ice margin...'Other authors (eg ... Gonzalez (1997) recognized two major faunal groups in the Early Permian of Argentina, the Uspallatian ...
ABSTRACT Here we show that the sedimentary succession of SE Pamir comprises a syn-rift succession... more ABSTRACT Here we show that the sedimentary succession of SE Pamir comprises a syn-rift succession (Bazar Dara Group) in the Carboniferous-Early Permian, followed by a marked deepening from the late Early Permian, with increasing volcanic activity and synsedimentary tectonics in the Gan and Takhtabulak formations, related to the opening of the Rushan ocean between South and Central Pamir; carbonate deposition characterizes most of the Triassic, but then Upper Triassic flysches record the progressive closure of the Rushan ocean. We also show that this Permian-Triassic stratigraphic and biotic evolution broadly matches that of Karakoram. We consider these blocks plus Central Pamir equivalent to the Qiantang Terrane of Tibet, all of Palaeozoic Gondwanan ancestry, which detached from Gondwana in the Early Permian to form the Cimmerian belt. This was dissected into distinct terranes separated by deep extensional basins (i.e. the Rushan basin between SE Pamir and Central Pamir, the Wakhan basin between SE Pamir and Karakoram; the Shuanghu basin in Qiangtang). The northward drift of this composite belt from the Gondwanan margin since the late Early Permian onward is well supported by statistical palaeobiogeographical se analyses which show that the biotic affinity of its blocks shifted from Gondwanan in the Asselian-Sakmarian (Early Permian) to Palaeoequatorial in the Roadian-Wordian (Middle Permian). We also show the occurrence of lowermost Jurassic deposits suturing intensively faulted and folded Permian and Triassic units, which record a marked Cimmerian unconformity, suggesting that South Pamir collided against Central Pamir along the Rushan-Pshart suture at the T-J boundary. The closure of the Rushan ocean was at least in part coeval to the closure of the Palaeotethys, which caused the collision of Central Pamir against North Pamir, at that time located at the southern Eurasian margin. Collision of Karakoram to South Pamir happened slightly later along the TBZ zone. Progressive time shifting of deformation can thus be related to the complex setting of the Cimmerian belt, which was subdivided into minor blocks by incipient oceanic basins, providing strong crustal mobility.
... However, more palaeomagnetic data are required in order to confirm the hypothesis of the prox... more ... However, more palaeomagnetic data are required in order to confirm the hypothesis of the proximity of South Thailand to the Gondwanan margin in the Roadian-Wordian and the orientation of the Mega-Lhasa. ... Proceedings of the Royal Society of Victoria, 111, 71-86. ...
ABSTRACT The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Earl... more ABSTRACT The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Early Triassic) time interval in the Central Alborz Mountains (north Iran) was sampled for ostracod analysis. We report 79 species distributed among 38 genera. Four new species are described: Acratia? pervagata Forel sp. nov., Microcheilinella alborzella Forel sp. nov., Basslerella superarella Crasquin sp. nov. and Cavellina nesenensis Crasquin sp. nov. The ontogeny of 13 species is described and sexual dimorphism in the genus Microcheilinella is here undoubtedly recognized for the first time. Six species show precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and quantified for two species. Rare long-time span Palaeocopida species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.
The present data in brief article provides additional data and information to our research articl... more The present data in brief article provides additional data and information to our research article "Micro- and nanostructures reflect the degree of diagenetic alteration in modern and fossil brachiopod shell calcite: a multi-analytical screening approach (CL, FE-SEM, AFM, EBSD)" [1] (Casella et al.). We present fibre morphology, nano- and microstructure, as well as calcite crystal orientations and textures found in pristine, experimentally altered (hydrothermal and thermal), and diagenetically overprinted brachiopod shells. Combination of the screening tools AFM, FE-SEM, and EBSD allows to observe a significant change in microstructural and textural features with an increasing degree of laboratory-based and naturally occurring diagenetic alteration. Amalgamation of neighbouring fibres was observed on the micrometre scale level, whereas progressive decomposition of biopolymers in the shells and fusion of nanoparticulate calcite crystals was detected on the nanometre scale. ...
... an upward thinning sediment body (or package) deposited seaward of the ice-grounding line dur... more ... an upward thinning sediment body (or package) deposited seaward of the ice-grounding line during a major recessional phase of a marine ice margin...'Other authors (eg ... Gonzalez (1997) recognized two major faunal groups in the Early Permian of Argentina, the Uspallatian ...
ABSTRACT Here we show that the sedimentary succession of SE Pamir comprises a syn-rift succession... more ABSTRACT Here we show that the sedimentary succession of SE Pamir comprises a syn-rift succession (Bazar Dara Group) in the Carboniferous-Early Permian, followed by a marked deepening from the late Early Permian, with increasing volcanic activity and synsedimentary tectonics in the Gan and Takhtabulak formations, related to the opening of the Rushan ocean between South and Central Pamir; carbonate deposition characterizes most of the Triassic, but then Upper Triassic flysches record the progressive closure of the Rushan ocean. We also show that this Permian-Triassic stratigraphic and biotic evolution broadly matches that of Karakoram. We consider these blocks plus Central Pamir equivalent to the Qiantang Terrane of Tibet, all of Palaeozoic Gondwanan ancestry, which detached from Gondwana in the Early Permian to form the Cimmerian belt. This was dissected into distinct terranes separated by deep extensional basins (i.e. the Rushan basin between SE Pamir and Central Pamir, the Wakhan basin between SE Pamir and Karakoram; the Shuanghu basin in Qiangtang). The northward drift of this composite belt from the Gondwanan margin since the late Early Permian onward is well supported by statistical palaeobiogeographical se analyses which show that the biotic affinity of its blocks shifted from Gondwanan in the Asselian-Sakmarian (Early Permian) to Palaeoequatorial in the Roadian-Wordian (Middle Permian). We also show the occurrence of lowermost Jurassic deposits suturing intensively faulted and folded Permian and Triassic units, which record a marked Cimmerian unconformity, suggesting that South Pamir collided against Central Pamir along the Rushan-Pshart suture at the T-J boundary. The closure of the Rushan ocean was at least in part coeval to the closure of the Palaeotethys, which caused the collision of Central Pamir against North Pamir, at that time located at the southern Eurasian margin. Collision of Karakoram to South Pamir happened slightly later along the TBZ zone. Progressive time shifting of deformation can thus be related to the complex setting of the Cimmerian belt, which was subdivided into minor blocks by incipient oceanic basins, providing strong crustal mobility.
... However, more palaeomagnetic data are required in order to confirm the hypothesis of the prox... more ... However, more palaeomagnetic data are required in order to confirm the hypothesis of the proximity of South Thailand to the Gondwanan margin in the Roadian-Wordian and the orientation of the Mega-Lhasa. ... Proceedings of the Royal Society of Victoria, 111, 71-86. ...
ABSTRACT The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Earl... more ABSTRACT The Elikah River section spanning the Lopingian (Late Permian) to the Griesbachian (Early Triassic) time interval in the Central Alborz Mountains (north Iran) was sampled for ostracod analysis. We report 79 species distributed among 38 genera. Four new species are described: Acratia? pervagata Forel sp. nov., Microcheilinella alborzella Forel sp. nov., Basslerella superarella Crasquin sp. nov. and Cavellina nesenensis Crasquin sp. nov. The ontogeny of 13 species is described and sexual dimorphism in the genus Microcheilinella is here undoubtedly recognized for the first time. Six species show precocious sexual dimorphism of their carapace as early as A-5 juvenile. The Lilliput effect is for the first time recorded and quantified for two species. Rare long-time span Palaeocopida species, known throughout the entire Permian, document relatively long-term evolution, including the size and growth rate modifications associated with the earlier appearance of carapace sexual dimorphism through time. These patterns might be related to the Guadalupian–Lopingian events and/or to climatic modifications occurring during the Permian interval.
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