Matches in SemOpenAlex for { <https://semopenalex.org/work/W2565856222> ?p ?o ?g. }
- W2565856222 endingPage "15" @default.
- W2565856222 startingPage "1" @default.
- W2565856222 abstract "Abstract To constrain the Phanerozoic crustal evolution of the Dunhuang Block, new whole-rock geochemistry, zircon U–Pb ages and Hf isotopic data were determined for three Paleozoic granitic plutons in the northern Altyn Tagh, northwest China. Zircon U–Pb dating of these plutons, including gneissic granite, mylonitic granite and augen gneiss, yielded Middle Devonian to Early Carboniferous crystallization ages of 358 ± 4 Ma, 382 ± 4 Ma and 332 ± 2 Ma, respectively. The gneissic granites are characterized by a small SiO 2 variation (69.11–70.33 wt.%) with moderate K 2 O (3.07–3.55 wt.%), Na 2 O (3.61–4.08 wt.%), low Fe 2 O 3 T (2.25–2.84 wt.%) and MgO (1.04–1.25 wt.%). The granites are weakly peraluminous with moderate aluminium saturation indexes (ASI = 1.02–1.08) and exhibit the geochemical features of high-K calc-alkaline igneous rocks. Although the major element contents of the mylonitic granites and the augen gneisses are different from those of the gneissic granites, all three plutons show similar REE patterns and trace element variations. Rocks from these plutons are all LREE-enriched and show relatively flat HREE patterns with pronounced depletions in Ba, Nb, Ta, Ti and negative Eu anomalies. Moreover, the rocks are characterized by high Sr (330.7–656 ppm), low Yb (0.513–1.521 ppm) and Y (5.199–13.73 ppm), and thus have high Sr/Y ratios (32–122), showing geochemical affinities of adakitic rocks. Their negative e Hf (t) values, low MgO, Cr, Co and Ni contents indicate a continental crust origin without significant involvement of mantle-derived materials. The negative Eu anomalies, low Yb and Y contents of these granitic rocks reveal that plagioclase and garnet are major residue minerals in the magma source. All the geochemical characteristics demonstrate that these adakitic plutons were produced by partial melting of thickened lower crust at relatively shallow depths under high amphibolite or granulite facies and did not reach the eclogite facies. Combining this with the formation ages, we suggest that the southern margin of the Dunhuang Block was thickened during the late Paleozoic. The gradual variations in the (La/Yb) N ratios of these rocks indicate that the continental crust of the southern Dunhuang Block was progressively thickened from the Late Devonian to Early Carboniferous. This thickening process was most likely triggered by continental collision between the Dunhuang Block and the Central Altyn massif." @default.
- W2565856222 created "2017-01-06" @default.
- W2565856222 creator A5002746489 @default.
- W2565856222 creator A5029512878 @default.
- W2565856222 creator A5060680735 @default.
- W2565856222 creator A5067438664 @default.
- W2565856222 creator A5068285146 @default.
- W2565856222 creator A5074346386 @default.
- W2565856222 creator A5086979603 @default.
- W2565856222 creator A5088305376 @default.
- W2565856222 date "2017-02-01" @default.
- W2565856222 modified "2023-10-17" @default.
- W2565856222 title "Paleozoic adakitic rocks in the northern Altyn Tagh, northwest China: Evidence for progressive crustal thickening beneath the Dunhuang Block" @default.
- W2565856222 cites W1832095094 @default.
- W2565856222 cites W1871734886 @default.
- W2565856222 cites W1972295324 @default.
- W2565856222 cites W1977650828 @default.
- W2565856222 cites W1977762406 @default.
- W2565856222 cites W1979584608 @default.
- W2565856222 cites W1979705656 @default.
- W2565856222 cites W1980291940 @default.
- W2565856222 cites W1981207838 @default.
- W2565856222 cites W1983200963 @default.
- W2565856222 cites W1983470380 @default.
- W2565856222 cites W1991712311 @default.
- W2565856222 cites W1997142214 @default.
- W2565856222 cites W2000521957 @default.
- W2565856222 cites W2008456126 @default.
- W2565856222 cites W2013857416 @default.
- W2565856222 cites W2016441603 @default.
- W2565856222 cites W2018245819 @default.
- W2565856222 cites W2019525094 @default.
- W2565856222 cites W2021987309 @default.
- W2565856222 cites W2027738705 @default.
- W2565856222 cites W2031506125 @default.
- W2565856222 cites W2035413487 @default.
- W2565856222 cites W2035670944 @default.
- W2565856222 cites W2037798089 @default.
- W2565856222 cites W2038101603 @default.
- W2565856222 cites W2038775297 @default.
- W2565856222 cites W2040126025 @default.
- W2565856222 cites W2041837766 @default.
- W2565856222 cites W2043953703 @default.
- W2565856222 cites W2044349582 @default.
- W2565856222 cites W2044921168 @default.
- W2565856222 cites W2048465888 @default.
- W2565856222 cites W2048857036 @default.
- W2565856222 cites W2049451277 @default.
- W2565856222 cites W2050582708 @default.
- W2565856222 cites W2053189535 @default.
- W2565856222 cites W2053721096 @default.
- W2565856222 cites W2053761887 @default.
- W2565856222 cites W2053800438 @default.
- W2565856222 cites W2054361831 @default.
- W2565856222 cites W2055157304 @default.
- W2565856222 cites W2055718208 @default.
- W2565856222 cites W2056501220 @default.
- W2565856222 cites W2057331853 @default.
- W2565856222 cites W2060461428 @default.
- W2565856222 cites W2061262769 @default.
- W2565856222 cites W2061837047 @default.
- W2565856222 cites W2069647204 @default.
- W2565856222 cites W2083623123 @default.
- W2565856222 cites W2087129024 @default.
- W2565856222 cites W2087330833 @default.
- W2565856222 cites W2087589601 @default.
- W2565856222 cites W2087946541 @default.
- W2565856222 cites W2091054025 @default.
- W2565856222 cites W2095583893 @default.
- W2565856222 cites W2099932450 @default.
- W2565856222 cites W2101599973 @default.
- W2565856222 cites W2102493287 @default.
- W2565856222 cites W2107790246 @default.
- W2565856222 cites W2124479594 @default.
- W2565856222 cites W2132875524 @default.
- W2565856222 cites W2137478736 @default.
- W2565856222 cites W2138522501 @default.
- W2565856222 cites W2143122913 @default.
- W2565856222 cites W2143699013 @default.
- W2565856222 cites W2144379252 @default.
- W2565856222 cites W2147173695 @default.
- W2565856222 cites W2161466829 @default.
- W2565856222 cites W2164911500 @default.
- W2565856222 cites W2167856052 @default.
- W2565856222 cites W2257662574 @default.
- W2565856222 cites W2325514473 @default.
- W2565856222 cites W4211136963 @default.
- W2565856222 cites W4255137559 @default.
- W2565856222 doi "https://doi.org/10.1016/j.lithos.2016.12.006" @default.
- W2565856222 hasPublicationYear "2017" @default.
- W2565856222 type Work @default.
- W2565856222 sameAs 2565856222 @default.
- W2565856222 citedByCount "21" @default.
- W2565856222 countsByYear W25658562222018 @default.
- W2565856222 countsByYear W25658562222019 @default.
- W2565856222 countsByYear W25658562222020 @default.
- W2565856222 countsByYear W25658562222021 @default.
- W2565856222 countsByYear W25658562222022 @default.