Matches in SemOpenAlex for { <https://semopenalex.org/work/W2000555536> ?p ?o ?g. }
- W2000555536 endingPage "368" @default.
- W2000555536 startingPage "347" @default.
- W2000555536 abstract "TTG rocks are commonly assumed to form by partial melting of oceanic crust during slab subduction or anatexis of thickened lower crust. The two models are tested by an integrated study of geochronology and geochemistry for a composite batholith of Neoproterozoic granitoids (mainly TTG-like) from the Yangtze Gorge in South China. Zircon U–Pb dating indicates that all granitoids crystallized in a period of 820 to 800 Ma. Zircon δ18O values are 4.85 to 6.84‰, suggesting limited contributions from supracrustal materials to magma sources. Zircon εHf(t) values for syn-magmatic domains range from − 3.6 to − 29.7, concordant with whole-rock εNd(t) values of − 2.1 to − 21.3. Correspondingly, zircon Hf model ages are 2.09 to 3.16 Ga, suggesting their derivation from ancient crust of Paleoproterozoic to Archean ages. TTG-like rocks contain inherited zircon cores that yield two groups of U–Pb ages at Paleoproterozoic (1.8 to 2.0 Ga) and Archean (~ 2.9 Ga), respectively. They show variable εHf(t) values from − 48.4 to − 33.4. Because the Neoproterozoic magmatism leads to variable increases of εHf(t) values for some inherited cores, only the lowest εHf(t) values for the inherited cores are assumed to represent the original Hf isotopes in source rocks. The screened results are consistent with those for Archean TTG gneiss and migmatite in this region. In addition, the TTG-like rocks have lower εNd(t) and εHf(t) values, higher Sr/Y and (La/Yb)N ratios and stronger depletion in Nb, Ta and Ti than the other granitoids. Two alternative scenarios are proposed to account for their petrogenesis: (1) anatexis of Archean and Paleoproterozoic mafic crust in the stable depths of garnet and amphibole, respectively; or (2) anatexis of Archean TTG and Paleoproterozoic mafic rocks in amphibole-stable depths. Nevertheless, the second one is preferred because the inherited zircons with Paleoproterozoic to Archean U–Pb ages are preserved in the TTG-like rocks, which is incompatible with high temperatures to generate the primary TTG magmas. Therefore, the Neoproterozoic TTG-like rocks were derived from the anatexis of ancient non-thickened lower crust, with the TTG features inheriting from their source." @default.
- W2000555536 created "2016-06-24" @default.
- W2000555536 creator A5007024896 @default.
- W2000555536 creator A5009790177 @default.
- W2000555536 creator A5011306686 @default.
- W2000555536 creator A5023735787 @default.
- W2000555536 creator A5038855167 @default.
- W2000555536 creator A5089999132 @default.
- W2000555536 date "2009-12-01" @default.
- W2000555536 modified "2023-10-18" @default.
- W2000555536 title "Origin of TTG-like rocks from anatexis of ancient lower crust: Geochemical evidence from Neoproterozoic granitoids in South China" @default.
- W2000555536 cites W1207354341 @default.
- W2000555536 cites W1739136493 @default.
- W2000555536 cites W1964127335 @default.
- W2000555536 cites W1964617878 @default.
- W2000555536 cites W1967082613 @default.
- W2000555536 cites W1969171536 @default.
- W2000555536 cites W1969859799 @default.
- W2000555536 cites W1969968003 @default.
- W2000555536 cites W1970680726 @default.
- W2000555536 cites W1977911355 @default.
- W2000555536 cites W1981756317 @default.
- W2000555536 cites W1982272146 @default.
- W2000555536 cites W1990581568 @default.
- W2000555536 cites W1991202690 @default.
- W2000555536 cites W1991532486 @default.
- W2000555536 cites W2009003389 @default.
- W2000555536 cites W2010432538 @default.
- W2000555536 cites W2010897022 @default.
- W2000555536 cites W2013857416 @default.
- W2000555536 cites W2017722262 @default.
- W2000555536 cites W2026412695 @default.
- W2000555536 cites W2028071342 @default.
- W2000555536 cites W2028642961 @default.
- W2000555536 cites W2029184354 @default.
- W2000555536 cites W2031423471 @default.
- W2000555536 cites W2035670944 @default.
- W2000555536 cites W2036174339 @default.
- W2000555536 cites W2037923466 @default.
- W2000555536 cites W2038775297 @default.
- W2000555536 cites W2039773351 @default.
- W2000555536 cites W2041989597 @default.
- W2000555536 cites W2044921168 @default.
- W2000555536 cites W2045527342 @default.
- W2000555536 cites W2046441274 @default.
- W2000555536 cites W2046961523 @default.
- W2000555536 cites W2050926313 @default.
- W2000555536 cites W2051273227 @default.
- W2000555536 cites W2051623493 @default.
- W2000555536 cites W2053721096 @default.
- W2000555536 cites W2056367500 @default.
- W2000555536 cites W2056501220 @default.
- W2000555536 cites W2061262769 @default.
- W2000555536 cites W2063207424 @default.
- W2000555536 cites W2066893568 @default.
- W2000555536 cites W2067498280 @default.
- W2000555536 cites W2077385643 @default.
- W2000555536 cites W2077532807 @default.
- W2000555536 cites W2077957912 @default.
- W2000555536 cites W2078261567 @default.
- W2000555536 cites W2083522304 @default.
- W2000555536 cites W2087494921 @default.
- W2000555536 cites W2087589601 @default.
- W2000555536 cites W2089048002 @default.
- W2000555536 cites W2090080717 @default.
- W2000555536 cites W2090590523 @default.
- W2000555536 cites W2090778446 @default.
- W2000555536 cites W2092151651 @default.
- W2000555536 cites W2092235841 @default.
- W2000555536 cites W2092664696 @default.
- W2000555536 cites W2093377908 @default.
- W2000555536 cites W2105636247 @default.
- W2000555536 cites W2113009765 @default.
- W2000555536 cites W2124479594 @default.
- W2000555536 cites W2138522501 @default.
- W2000555536 cites W2140913803 @default.
- W2000555536 cites W2145666199 @default.
- W2000555536 cites W2149787537 @default.
- W2000555536 cites W2159104880 @default.
- W2000555536 cites W2162645778 @default.
- W2000555536 cites W2168661179 @default.
- W2000555536 cites W2168882659 @default.
- W2000555536 cites W2325514473 @default.
- W2000555536 cites W2325796242 @default.
- W2000555536 cites W2328421945 @default.
- W2000555536 cites W2334581221 @default.
- W2000555536 cites W2371445061 @default.
- W2000555536 doi "https://doi.org/10.1016/j.lithos.2009.04.024" @default.
- W2000555536 hasPublicationYear "2009" @default.
- W2000555536 type Work @default.
- W2000555536 sameAs 2000555536 @default.
- W2000555536 citedByCount "115" @default.
- W2000555536 countsByYear W20005555362012 @default.
- W2000555536 countsByYear W20005555362013 @default.
- W2000555536 countsByYear W20005555362014 @default.
- W2000555536 countsByYear W20005555362015 @default.
- W2000555536 countsByYear W20005555362016 @default.
- W2000555536 countsByYear W20005555362017 @default.