文档介绍：
锆石微量元素对铜陵侵入岩成因和铜、金成
矿的制约#
方德,陈思,谢建成,李全忠**
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(合肥工业大学资源与环境工程学院)
摘要:安徽铜陵地区是我国最著名的铜金产地之一,成矿与岩浆作用关系密切。近十年来,
铜陵中生代侵入岩的成因仍然存在分歧。本次我们报道了铜陵地区侵入岩新的锆石原位微量
元素数据。铜陵地区侵入岩具有典型的岩浆锆石特征:一致的重稀土富集、Ce 正异常和弱
Eu 负异常的稀土配分模式,高 Th/U 比值和(Sm/La)N 值,低 La 含量。高 Eu/Eu*比值、较
低锆石 Ti 温度、Yb-U-Y 和 Ti-Hf 相关关系等锆石微量元素特征暗示本区侵入岩来源于俯冲
洋壳部分熔融,在其上升过程中与富集地幔发生结晶分异作用。高锆石 Ce+4/Ce+3 比值(>100)
反映了高氧逸度特征。这些明显的锆石地球化学特征表明铜陵地区侵入岩和大规模 Cu、Au
成矿作用是俯冲洋壳部分熔融结果。
关键词:锆石;原位微量元素;Ce+4/Ce+3;洋壳部分熔融;铜陵
中图分类号:P59
Petrogenesis of Mesozoic intrusive rocks and Cu-Au
mineralization in Tongling region: In-situ zircon
geochemical constraints
FANG De, CHEN Si, XIE Jiancheng, LI Quanzhong
(School of Resources and Environmental Engineering, Hefei University of Technology)
Abstract: Tongling region is one of the most important non-ferrous metal producers where the
formation of Cu-Au deposits has closely ic relations with Mesozoic intrusions. However,
petrogenesis of intrusions has been hotly debated in the past decade. Here we report new in-situ
trace element data of zircon from the intrusive rocks in Tongling region. The Tongling intrusive
rocks have typical characteristics of magmatic zircon: consistent REE patterns with HREE
enrichment, Ce positive anomaly, weak Eu negative anomaly, high Th/U and (Sm/La)N ratios,
low La contents. The trace element characteristics of zircon have high Eu/Eu* values,