科研之友
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摘要
Zhonggu iron ore field is located in south part of Ningwu basin. The ore filed occurred diorite and monzonite intrusions (132 similar to 129Ma) which are related to iron deposits. The origin and evolution of these intrusions still need to be further studied. Here, we conduct LA-ICP-MS zircon Hf isotope and SHRIMP zircon O isotope test focus on the Gushan porphyritic gabbrodiorite, the Longshan gabbrodiorite, the Baixingshan diorite, the Zhongjiu diorite and the Taipingshan monzonite. Hf-176/(177) Hf ratios of these intrusions are 0. 282425 similar to 0. 282695 (t(DM2) = -1. 26 similar to 1. 86Ga). The range of zircons have delta O-18 ranging from 3. 34% to 8. 05% and epsilon(Hf) (t) ranging from -12. 3 to -3. 9. Hf-176/Hf-177 ratios of inherited zircons in Taipingshan monzonite are 0. 282324 similar to 0. 282487 (t(DM2) = 1. 72 similar to 20. 8 Ga). The range of inherited zircons have delta O-18 ranging from 5. 90% to 6. 51% and epsilon(Hf) (t) ranging from -15. 8 to -10. 1. Zhonggu magmatic rocks are derived from enriched lithospheric mantle. Hf-O isotope imply the magma in this area are consistent with the Early Cretaceous period of lithospheric thinning and extension influenced by the subduction of the Paleo-Pacific Plate. Magmatic rocks in Middle and Lower Yangtze Metalloic Belt include Ningwu have the same origin, magmatic rocks in iron districts such as Ningwu and Luzong are mainly directely fromed by enriched lithospheric mantle, while magmatic rocks in copper. polymetallic districts represented by Tongling and Fancang contaminated with more Paleoproterozoic and neoproterozoic earth crust.
- 出版日期2017
- 单位合肥工业大学
