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PETROCHEMISTRY AND GEOLOGIC SIGNIFICANCE OF VOLCANIC ROCKS IN THE LAOZANGGOU POLYMETALLIC AREA QINGHAI PROVINCE

Li Yiwei;Chen Jie;Li Huiwen No. 7 Geological Brigade, Qingai Province Technical School of Geology, Qinghai Province  
The Laozanggou polymetallic ore ares is situated in the central part of the west section of the Indosinian fold system of the southside of Qinling. The ore deposits occur in the Upper Triassic continental acidic volcanic suite in association with volcanic structures. Allthe volcanic rocks are subalkalic and high-alumium basalts and thaleiitic basslts belonging to calc-alkalic and calcic volcanic series of oro-genic and active continental marginal types. the paper points out that the calc-alkalic and calcic volcanic suites are products of comagmatic continuous differentiation Petrochemistry study shows: 1. these volcanic suites have high SiO_2and low TiO_2, Fe_2O_3, Na_2O; 2. the K_2O/Na_2O ratio is relativelyhigh (1.7-6.64); 3. the oxidation coefficient F(F=FeO/FeO+Fe_2O_2)of the intermediate-acidic volcanic rocks is high, but the F of theintermediate volcanic rocks is low.
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