Matches in SemOpenAlex for { <https://semopenalex.org/work/W4322004611> ?p ?o ?g. }
Showing items 1 to 74 of
74
with 100 items per page.
- W4322004611 abstract "A forearc environment is usually characterised by a relatively low geothermal gradient and hence little magmatic activity occurs. However, S-type granites were discovered within the forearc accretionary complex of the East Kunlun Orogenic Belt. The S-type granites intruded into an upper amphiolite facies partially migmatitic crystalline basement in form of dikes and sills at ca. 440 Ma which corresponds to the transition of the Proto-Tethyan to the Paleo-Tethyan realm in the northern Tibetan Plateau. The observed granites contain either garnet + biotite + muscovite or garnet + muscovite: (1) muscovite granite is strongly peraluminous with an aluminous saturation index (ASI) of more than 1.1 (ASI = molar [Al2O3/(Na2O+K2O+CaO]) and has high-K calc-alkaline characteristics, low Sr/Y (1.9–16.1) and LaN/YbN (1.85–13.2) ratios. (2) Two-mica granite is moderately peraluminous (ASI = 1.02–1.09), has high Ca and low K contents as well as high Sr/Y (16.8–67.7) and LaN/YbN(10.9–33.3) ratios. Other trace element contents and their ratios also show striking differences with high Sr (207–324 ppm) content and CaO/Na2O (0.47–0.96) ratio, and a low Rb/Sr (0.04–0.32) ratio for two-mica granite, but low Sr (63–126 ppm) content and CaO/Na2O (0.08–0.20) ratio, and a high Rb/Sr (0.56–2.53) ratio for muscovite granite. The observed differences are due to different protolith chemistries and melting mechanisms. Based on melting experiments of metasedimentary rocks (Patiño Douce and Harris, 1998), muscovite granite was most likely produced by dehydration melting of a metapelitic source and the two-mica granite by H2O-fluxed melting of a metagreywacke. Zircon Hf isotopes of the two S-type granites have εHf(440 Ma) values of -6.85 to +12.02 indicating the involvement of a mantle-derived magma which probably triggered the anatexis of supracrustal rocks deposited in a forarc regime. Coveal adakites with a younging westward trend as well as mafic rocks have been reported in this accretionary complex, which together with anatexis and metamorphism of accreted material support the occurrence of a slab window beneath the forearc accretionary complex of the East Kunlun Orogenic Belt during subduction of the Tethyan oceanic slab. ReferencesPatiño Douce, A.E., Harris, N., 1998. Experimental constraints on Himalayan anatexis. Journal of Petrology 39, 689–710." @default.
- W4322004611 created "2023-02-26" @default.
- W4322004611 creator A5003194841 @default.
- W4322004611 creator A5050225573 @default.
- W4322004611 creator A5077916902 @default.
- W4322004611 creator A5085707063 @default.
- W4322004611 date "2023-05-15" @default.
- W4322004611 modified "2023-10-16" @default.
- W4322004611 title "Origin of S-type granites in the forearc accretionary complex of the East Kunlun Orogenic Belt, northern Tibetan Plateau" @default.
- W4322004611 doi "https://doi.org/10.5194/egusphere-egu23-9902" @default.
- W4322004611 hasPublicationYear "2023" @default.
- W4322004611 type Work @default.
- W4322004611 citedByCount "0" @default.
- W4322004611 crossrefType "posted-content" @default.
- W4322004611 hasAuthorship W4322004611A5003194841 @default.
- W4322004611 hasAuthorship W4322004611A5050225573 @default.
- W4322004611 hasAuthorship W4322004611A5077916902 @default.
- W4322004611 hasAuthorship W4322004611A5085707063 @default.
- W4322004611 hasConcept C127313418 @default.
- W4322004611 hasConcept C134306372 @default.
- W4322004611 hasConcept C151730666 @default.
- W4322004611 hasConcept C156622251 @default.
- W4322004611 hasConcept C165205528 @default.
- W4322004611 hasConcept C172660882 @default.
- W4322004611 hasConcept C17409809 @default.
- W4322004611 hasConcept C26687426 @default.
- W4322004611 hasConcept C2776152364 @default.
- W4322004611 hasConcept C2776581184 @default.
- W4322004611 hasConcept C2777229588 @default.
- W4322004611 hasConcept C2779870107 @default.
- W4322004611 hasConcept C2780030769 @default.
- W4322004611 hasConcept C33923547 @default.
- W4322004611 hasConcept C37282123 @default.
- W4322004611 hasConcept C40201923 @default.
- W4322004611 hasConcept C58097730 @default.
- W4322004611 hasConcept C5900021 @default.
- W4322004611 hasConcept C77928131 @default.
- W4322004611 hasConcept C94436079 @default.
- W4322004611 hasConceptScore W4322004611C127313418 @default.
- W4322004611 hasConceptScore W4322004611C134306372 @default.
- W4322004611 hasConceptScore W4322004611C151730666 @default.
- W4322004611 hasConceptScore W4322004611C156622251 @default.
- W4322004611 hasConceptScore W4322004611C165205528 @default.
- W4322004611 hasConceptScore W4322004611C172660882 @default.
- W4322004611 hasConceptScore W4322004611C17409809 @default.
- W4322004611 hasConceptScore W4322004611C26687426 @default.
- W4322004611 hasConceptScore W4322004611C2776152364 @default.
- W4322004611 hasConceptScore W4322004611C2776581184 @default.
- W4322004611 hasConceptScore W4322004611C2777229588 @default.
- W4322004611 hasConceptScore W4322004611C2779870107 @default.
- W4322004611 hasConceptScore W4322004611C2780030769 @default.
- W4322004611 hasConceptScore W4322004611C33923547 @default.
- W4322004611 hasConceptScore W4322004611C37282123 @default.
- W4322004611 hasConceptScore W4322004611C40201923 @default.
- W4322004611 hasConceptScore W4322004611C58097730 @default.
- W4322004611 hasConceptScore W4322004611C5900021 @default.
- W4322004611 hasConceptScore W4322004611C77928131 @default.
- W4322004611 hasConceptScore W4322004611C94436079 @default.
- W4322004611 hasLocation W43220046111 @default.
- W4322004611 hasOpenAccess W4322004611 @default.
- W4322004611 hasPrimaryLocation W43220046111 @default.
- W4322004611 hasRelatedWork W1964455314 @default.
- W4322004611 hasRelatedWork W2046597221 @default.
- W4322004611 hasRelatedWork W2092838792 @default.
- W4322004611 hasRelatedWork W2164050911 @default.
- W4322004611 hasRelatedWork W2333609535 @default.
- W4322004611 hasRelatedWork W2344958173 @default.
- W4322004611 hasRelatedWork W2347794752 @default.
- W4322004611 hasRelatedWork W2380934447 @default.
- W4322004611 hasRelatedWork W2473719306 @default.
- W4322004611 hasRelatedWork W3137736697 @default.
- W4322004611 isParatext "false" @default.
- W4322004611 isRetracted "false" @default.
- W4322004611 workType "article" @default.