TL;DRAbstract
This paper presents petrographic observations and geochemical analyses on the Laomiaojishan, Xiaotongguanshan and Tianebaodanshan intrusions with quartz monzonitic dioritic composition and xenoliths with gabbroic to dioritic compositions exposed in the Tongguanshan ore field, Tongling, Anhui Province, East China, and provides some evidence for the origin of the intrusions and xenoliths. The Xiaotongguanshan intrusion is dated at (139.5±2.9) Ma using the SHRIMP zircon U-Pb method and represents product of the Late Jurassic to Early Cretaceous magmatism in the lower valley of Yangtze River. The gabbro and diorite autoliths are low in SiO2(52.03%-54.61%), Al2O3(12.87%-14.43%) and total alkalis (Na2O+K2O) (5.26%-6.30%), but high in MgO (5.41%-11.66%), relative to the hosts which have high SiO2(59.97%-64.44%), Al2O3(16.43%-17.59%) and total alkalis (6.67%-8.25%), but low in MgO(1.52%-2.50%). The gabbro and diorite autoliths have similar total REE content ranging from 165.70×10^(-6) to 190.4
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This paper presents petrographic observations and geochemical analyses on the Laomiaojishan, Xiaotongguanshan and Tianebaodanshan intrusions with quartz monzonitic dioritic composition and xenoliths with gabbroic to dioritic compositions exposed in the Tongguanshan ore field, Tongling, Anhui Province, East China, and provides some evidence for the origin of the intrusions and xenoliths. The Xiaotongguanshan intrusion is dated at (139.5±2.9) Ma using the SHRIMP zircon U-Pb method and represents product of the Late Jurassic to Early Cretaceous magmatism in the lower valley of Yangtze River. The gabbro and diorite autoliths are low in SiO2(52.03%-54.61%), Al2O3(12.87%-14.43%) and total alkalis (Na2O+K2O) (5.26%-6.30%), but high in MgO (5.41%-11.66%), relative to the hosts which have high SiO2(59.97%-64.44%), Al2O3(16.43%-17.59%) and total alkalis (6.67%-8.25%), but low in MgO(1.52%-2.50%). The gabbro and diorite autoliths have similar total REE content ranging from 165.70×10^(-6) to 190.4
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