《Table 6 Sr–Nb–Pb Isotope Compositions of the Granitoids in Jiangla’angzong》

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《"Petrogenesis of Late Cretaceous Jiangla'angzong I-Type Granite in Central Lhasa Terrane, Tibet, China: Constraints from Whole-Rock Geochemistry, Zircon U-Pb Geochronology, and Sr-Nd-Pb-Hf Isotopes"》

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Notes:（87Sr/86Sr）t=（87Sr/86Sr）-87Rb/86Sr（eλt-1）；λRb=1.42×10-11t-1；（143Nd/144Nd）t=（143Nd/144Nd）-（147Sm/144Nd）（eλt-1） ，λSm=6.54×10-12t-1；εNd（0）=[（143Nd/144Nd）/（143Nd/144Nd）CHUR-1]×10000；εNd（t）={[（143Nd/144Nd）t/（143Nd/144Nd）

Whole-rock geochemical data from the Jiangla’angzong granitic rocks（syenogranite and adamellite）are listed in Table 1.The granitic rocks were characterized by high Si O2（65.10–70.9wt%），high K2O+Na2O（7.13–8.15wt%），low Al2O3（14.14–16.45wt%），and Ca O（2.33–4.11wt%），and a Rittmann Index（σ43）=2.18–2.33.This indicates that these rocks belong to a high-K calc-alkaline series.The A/CNK values（the molar ratio of Al2O3/[Ca O+K2O+Na2O]）ranges from 0.88 to 1.02，with an average of 0.97，which indicates that these rocks belong to a metaluminous series（Figs.3b，3c）.Syenogranite and adamellite have similar rare earth element（REE）and trace element compositions（Table 2，Figs.3d，3e），and the Jiangla’angzong granitic rocks have high total REE contents（ΣREE=132–189ppm）.The chondrite-normalized REE patterns are characterized by significant light REE（LREE）enrichment（LREE/HREE:13.7–18.1，LaN/YbN:14.3–31.9）andrelatively flat heavy REE（HREE）patterns，with negative Eu anomalies（δEu:0.518–0.940）（Fig.3d） .The primitive mantle-normalized trace element spider diagrams（Fig.3e）clearly indicate that these rocks are relatively enriched in large ion lithophile elements，such as K，Th，and Rb，and depletion in high field strength elements，such as Nb，Ta，Zr，Hf，and Ti.