地球学报2012，Vol.33Issue(4)：537-545,9.DOI:10.3975/cagsb.2012.04.14
西藏浦桑果铜多金属矿床侵入岩的地球化学特征及对构造环境的约束
Geochemical Characteristics of Intrusive Rocks in the Pusangguo Copper-Polymetallic Deposit, Tibet: Constraints on Tectonic Setting
摘要
Abstract
The Pusangguo copper-polymetallic deposit is located in Nanmulin volcanic basin. Petrographic and geochemical studies of granodiorite, granodiorite-porphyry and diorite-porphyrite show that the intrusive rocks are of calc-alkaline series, with ω(SiO2) ranging from 59.08% to 67.28%, ω(Al2O3) ranging from 15.38% to 16.86%, ω(MgO) ranging from 1.52% to 4.06%, and ω(TFeO) ranging from 1.2% to 3.46%. Total REE concentrations range from 22.0×10-6 to 148.56×10-6, LaN/YbN ratios vary from 17.98 to 37.57, with the enrichment of LREE. Granodiorite, granodiorite-porphyry and diorite-porphyrite are enriched with LILE elements such as Cs, Rb and Sr and depleted in HFSE elements such as Th, U and Nb, with weak or intensely negative Eu anomalies and no or weak Ce anomalous features. Petrographic and geochemical studies indicate that granodiorite-porphyry and diorite-porphyrite were produced by Tethys subduction towards North Lhasa tectonic body, and granodiorite was formed in an extension setting of post-collision in Tibet Plateau.关键词
铜多金属矿床/侵入岩/地球化学/构造环境/约束Key words
copper-polymetallic deposit/ intrusive rock/ geochemistry/ tectonic setting/ constraints分类
天文与地球科学引用本文复制引用
崔晓亮,多吉,刘鸿飞,张金树,刘婷婷,粟登逵,普布次仁,杜刚强,刘祖军..西藏浦桑果铜多金属矿床侵入岩的地球化学特征及对构造环境的约束[J].地球学报,2012,33(4):537-545,9.基金项目
本文由中国地质调查局项目"西藏大型矿床成矿专属性研究"(编号:1212011221073)和成都地质调查中心项目"西藏冈底斯成矿带构造岩浆演化与成矿作用研究"(编码:1212010818098)联合资助. （编号:1212011221073）
