Luku Alkali Syenite in the Hongge Ore district, SW China: Geochemistry, Geochronology and Metallogenic Significance
نویسندگان
چکیده
Luku alkali syenite is distributed throughout the southern end of Hongge basic-ultrabasic intrusion in Panzhihua, Sichuan, SW China. Using LA-ICP-MS, yielded a zircon U-Pb age 264.5 ± 1.6 Ma, concordant with ages E'meishan large igneous province (260 Ma). The displayed silica-saturated, Al-adequate and alkali-rich signatures, SiO2 62.07%–64.04%, Al2O3 16.26%–16.79% Na2O + K2O 9.17%–9.91% (averaging 9.31%). rock falls into alkaline zone on SiO2-A.R. diagram, as well potassium K2O-Na2O indicating rock. has low total REE concentration showed enrichment LREE (LREE/HREE = 7.06–7.95), typical negative Eu anomalies (δEu 0.73–0.80), trace element deficiencies LILEs (Ba, K, Sr, Zr) HFSEs (Th, U, Nd, Sm, Ta Nb), displaying crust mantle information. Zircons show strong positive Ce anomaly anomaly, similar to characteristics crustal source magmatic zircon, however (Lu/Gd)N ratio ranges from 1.48 3.17, (Yb/Sm)N 38.49 77.15, which are mantle-derived zircon. In La/Yb-δEu correlation data plots near boundary between type crust-mantle type. From combined ‘trinity’ spatiotemporal relationship Indosinian intermediate-acid intrusive rocks Panxi area basalt rocks, regional tectonic evolution partial melting model most intraplate magma sources, we believe that Sichuan was formed material, due underplating plume basic magma.
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ژورنال
عنوان ژورنال: Acta Geologica Sinica-english Edition
سال: 2021
ISSN: ['1755-6724', '1000-9515']
DOI: https://doi.org/10.1111/1755-6724.14791