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• W2362602871 abstract "The 49 km long, E-W trending granitic belt with an area of - 90 km2 at the south margin of the Bashikaogong Basin intruded into the Precambrian sandstones, schists, mudstones and tuffs. Field observations show that it consists of four types of granites, e. g. , gigantic phenocryst granites (Ⅰ) , fine to intermediate grained red granites (Ⅱ) , intermediate to coarse grained porphyritic grey granites (Ⅲ) , and intermediate to coarse grained porphyritic pink granites (Ⅳ) . Petrochemically, these granites are peraluminous in that they have (1) contents of SiO2 and alkaline (Na2O+K2O) ranging from 65. 14% to 75. 66% , and from 7. 49% to 8. 96%,respectively; (2) K2O/Na2O ratios ranging from 1. 12 to 2. 68; (3) Rittmann index from 1. 83 to 2. 81, with an average of 2.34; and (4) corundum (AC) (0.77-3.93%, and average 1. 78) CIPW normative. These granites have total REE contents of 89. 44 -335. 28×10-6, and substantial negative Eu anomalies. From type Ⅰ through Ⅲ and Ⅳ to Ⅱ granites, Eu/Eu* ratios decrease from 0. 65 over 0. 51 and 0. 48 to 0. 30. Trace element compositional data show that (1) these granites have pronounced negative Ba, Nb, Sr, P and Ti anomalies; (2) their trace element abundances decrease, but the magnitude of Ba, Nb, Sr, P and Ti anomalies increase from type Ⅰ through Ⅲ and Ⅳ to Ⅱ granites. Major element and trace element data indicate that they have an S-type granite affinity. Zircons separated from these four types of granites were used to perform SHRIMP U-Pb zircon dating to constrain their formation ages. Dating results show that their formation ages are 474. 3±6. 8Ma for type Ⅰ granite, 446. 6±5. 2Ma for type Ⅱ granite, 434. 5±3. 8Ma for type Ⅲ, and 431. 1±3. 8Ma for type Ⅳ granite, respectively. Combined with field observational data, these data suggest that these granites were derived from partial melting of crustal materials during syn-collision and post collision events between Altun and Tarim continental blocks in Paleozoic time." @default.
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• W2362602871 date "2005-01-01" @default.
• W2362602871 modified "2023-09-24" @default.
• W2362602871 title "Characteristics of the granitoid complex and its zircon SHRIMP dating at the south margin of the Bashikaogong Basin, North Altun, NW China." @default.
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