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Zhenhua Xue - One of the best experts on this subject based on the ideXlab platform.
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an intracontinental orogen exhumed by basement slice Imbrication in the longmenshan thrust belt of the eastern tibetan plateau
Geological Society of America Bulletin, 2021Co-Authors: Zhenhua Xue, Wei Lin, Yang Chu, Michel Faure, Yan Chen, Huaning QiuAbstract:The Longmenshan Thrust Belt in Eastern Tibet resulted from a Mesozoic orogeny and Cenozoic reworking. It is generally believed that the Cenozoic tectonics along the Longmenshan Thrust Belt are mostly inherited from the Mesozoic. Reconstructing the Mesozoic tectonics of the Longmenshan Thrust Belt is therefore important for understanding its evolutionary history. On the basis of detailed structural analysis, we recognized a Main Central Boundary that divides the Longmenshan Thrust Belt into a Southeastern Zone and a Northwestern Zone. Both zones underwent a main D1 event characterized by D1E top-to-the-SE thrusting in the Southeastern Zone and D1W top-to-the-NW/N thrusting in the Northwestern Zone. In the Southeastern Zone, a D2 top-to-the-NW/N normal faulting that cuts the D1E structures is developed along the NW boundary of the basement complexes. Newly obtained and previous geochronological data indicate that the D1E and D1W events occurred synchronously at ca. 224−219 Ma, and the D2 top-to-the-NW/N normal faulting was episodically activated at ca. 166−160 Ma, 141−120 Ma, 81−47 Ma, and 27−25 Ma. Episodic and synchronously activated top-to-the-NW normal faulting and top-to-the-SE thrusting along the northwestern and southeastern boundaries of the basement complexes, respectively, leads us to propose that the basement slices were episodically imbricated to the SE during the Late Jurassic−Early Cretaceous and Late Cretaceous−earliest Paleocene. The D1 amphibolite facies metamorphic rocks above the basement complexes recorded fast exhumation during the Late Jurassic−Early Cretaceous. We propose that the early Mesozoic northwestward basement underthrusting along a crustal “weak zone” was responsible for the D1 double-vergent thrusting and amphibolite facies metamorphism. Subsequent basement-slice Imbrications reworked the Longmenshan Thrust Belt and exhumed the amphibolite facies rocks. Our results highlight the importance of basement underthrusting and Imbrication in the formation and reworking of the intracontinental Longmenshan Thrust Belt in Eastern Tibet.
Janet Saeed Hina - One of the best experts on this subject based on the ideXlab platform.
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Congenital combined eyelid Imbrication and floppy eyelid syndrome
Journal of Optometry, 2010Co-Authors: Thabit Ali Abduallah Mustafa Odat, Janet Saeed HinaAbstract:Eyelid Imbrication syndrome is an idiopathic acquired eyelid disorder characterized by upper eyelids overriding the lower eyelids. Congenital eyelid Imbrications syndrome is extremely rare and thorough review of literature revealed only two previously reported cases and one congenital combined eyelid Imbrications and floppy eyelid syndrome. We report a third case of bilateral asymmetric congenital eyelid Imbrication syndrome and a second case of congenital combined eyelid Imbrication and floppy eyelid syndrome that resolved with conservative treatment.
Huaning Qiu - One of the best experts on this subject based on the ideXlab platform.
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an intracontinental orogen exhumed by basement slice Imbrication in the longmenshan thrust belt of the eastern tibetan plateau
Geological Society of America Bulletin, 2021Co-Authors: Zhenhua Xue, Wei Lin, Yang Chu, Michel Faure, Yan Chen, Huaning QiuAbstract:The Longmenshan Thrust Belt in Eastern Tibet resulted from a Mesozoic orogeny and Cenozoic reworking. It is generally believed that the Cenozoic tectonics along the Longmenshan Thrust Belt are mostly inherited from the Mesozoic. Reconstructing the Mesozoic tectonics of the Longmenshan Thrust Belt is therefore important for understanding its evolutionary history. On the basis of detailed structural analysis, we recognized a Main Central Boundary that divides the Longmenshan Thrust Belt into a Southeastern Zone and a Northwestern Zone. Both zones underwent a main D1 event characterized by D1E top-to-the-SE thrusting in the Southeastern Zone and D1W top-to-the-NW/N thrusting in the Northwestern Zone. In the Southeastern Zone, a D2 top-to-the-NW/N normal faulting that cuts the D1E structures is developed along the NW boundary of the basement complexes. Newly obtained and previous geochronological data indicate that the D1E and D1W events occurred synchronously at ca. 224−219 Ma, and the D2 top-to-the-NW/N normal faulting was episodically activated at ca. 166−160 Ma, 141−120 Ma, 81−47 Ma, and 27−25 Ma. Episodic and synchronously activated top-to-the-NW normal faulting and top-to-the-SE thrusting along the northwestern and southeastern boundaries of the basement complexes, respectively, leads us to propose that the basement slices were episodically imbricated to the SE during the Late Jurassic−Early Cretaceous and Late Cretaceous−earliest Paleocene. The D1 amphibolite facies metamorphic rocks above the basement complexes recorded fast exhumation during the Late Jurassic−Early Cretaceous. We propose that the early Mesozoic northwestward basement underthrusting along a crustal “weak zone” was responsible for the D1 double-vergent thrusting and amphibolite facies metamorphism. Subsequent basement-slice Imbrications reworked the Longmenshan Thrust Belt and exhumed the amphibolite facies rocks. Our results highlight the importance of basement underthrusting and Imbrication in the formation and reworking of the intracontinental Longmenshan Thrust Belt in Eastern Tibet.
Qiu Huaning - One of the best experts on this subject based on the ideXlab platform.
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An intracontinental orogen exhumed by basement-slice Imbrication in the Longmenshan Thrust Belt of the Eastern Tibetan Plateau
'Geological Society of America', 2021Co-Authors: Xue Zhenhua, Lin Wei, Chu Yang, Faure Michel, Chen Yan, Ji Wenbin, Qiu HuaningAbstract:International audienceThe Longmenshan Thrust Belt in Eastern Tibet resulted from a Mesozoic orogeny and Cenozoic reworking. It is generally believed that the Cenozoic tectonics along the Longmenshan Thrust Belt are mostly inherited from the Mesozoic. Reconstructing the Mesozoic tectonics of the Longmenshan Thrust Belt is therefore important for understanding its evolutionary history. On the basis of detailed structural analysis, we recognized a Main Central Boundary that divides the Longmenshan Thrust Belt into a Southeastern Zone and a Northwestern Zone. Both zones underwent a main D1 event characterized by D1E top-to-the-SE thrusting in the Southeastern Zone and D1W top-to-the-NW/N thrusting in the Northwestern Zone. In the Southeastern Zone, a D2 top-to-the-NW/N normal faulting that cuts the D1E structures is developed along the NW boundary of the basement complexes. Newly obtained and previous geochronological data indicate that the D1E and D1W events occurred synchronously at ca. 224−219 Ma, and the D2 top-to-the-NW/N normal faulting was episodically activated at ca. 166−160 Ma, 141−120 Ma, 81−47 Ma, and 27−25 Ma. Episodic and synchronously activated top-to-the-NW normal faulting and top-to-the-SE thrusting along the northwestern and southeastern boundaries of the basement complexes, respectively, leads us to propose that the basement slices were episodically imbricated to the SE during the Late Jurassic−Early Cretaceous and Late Cretaceous−earliest Paleocene. The D1 amphibolite facies metamorphic rocks above the basement complexes recorded fast exhumation during the Late Jurassic−Early Cretaceous. We propose that the early Mesozoic northwestward basement underthrusting along a crustal “weak zone” was responsible for the D1 double-vergent thrusting and amphibolite facies metamorphism. Subsequent basement-slice Imbrications reworked the Longmenshan Thrust Belt and exhumed the amphibolite facies rocks. Our results highlight the importance of basement underthrusting and Imbrication in the formation and reworking of the intracontinental Longmenshan Thrust Belt in Eastern Tibet
Masahito Ohji - One of the best experts on this subject based on the ideXlab platform.
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scleral Imbrication combined with vitrectomy and gas tamponade for refractory macular hole retinal detachment associated with high myopia
Retina-the Journal of Retinal and Vitreous Diseases, 2014Co-Authors: Masato Fujikawa, Hajime Kawamura, Masashi Kakinoki, Osamu Sawada, Tomoko Sawada, Yoshitsugu Saishin, Masahito OhjiAbstract:Purpose:To evaluate scleral Imbrication with vitrectomy and gas tamponade for refractory macular hole retinal detachment associated with high myopia.Methods:We retrospectively reviewed the medical records of eight eyes with macular hole retinal detachment and high myopia treated with temporal sclera
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retinal changes after retinal translocation surgery with scleral Imbrication in dog eyes
Investigative Ophthalmology & Visual Science, 2000Co-Authors: Atsushi Hayashi, Masahito Ohji, Shinichi Usui, Kiyotomi Kawaguchi, Sayuri Fujioka, Shunji Kusaka, Takashi Fujikado, Yasuo TanoAbstract:PURPOSE To examine retinal changes induced by scleral Imbrication during retinal translocation surgery in dog eyes. METHODS Fifteen dogs were anesthetized and underwent retinal translocation surgery. After lensectomy and vitrectomy, an intentional retinal detachment was created, and the upper temporal sclera around the equator was imbricated with five mattress sutures. Translocated distances were calculated by pre- and postoperative photographs. At 1, 2, and 4 weeks after the surgery, the retina was studied by TdT-dNTP terminal nick-end labeling (TUNEL) and immunohistochemistry of peanut agglutinin (PNA) lectin and glial fibrillary acidic protein (GFAP). RESULTS The retina was translocated by a mean distance of 0.53 +/- 0.30 disc diameters or 959 +/- 543 micrometer. Retinal folds were created around the optic disc in all eyes. Histologic examination of the retinal folds 1 week after the surgery showed many TUNEL-positive cells in the outer nuclear layer, loss of photoreceptor cells, and shortening of the outer and inner segments. A strong immunoreactivity to GFAP was detected in the folds of the retina. CONCLUSIONS . The results demonstrated that retinal translocation surgery by scleral Imbrication inevitably caused retinal folds as a postoperative complication, and the retina within the folds showed extensive loss of photoreceptor cells. It is recommended that the foveal translocation surgery be planned to avoid involving the fovea in the retinal folds.
