东昆仑黑石山铜多金属矿床闪长岩锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素
李治华 , 李碧乐 , 李鹏 , 孙亚明 , 史雨凡
地球科学 ›› 2023, Vol. 48 ›› Issue (12) : 4465 -4480.
东昆仑黑石山铜多金属矿床闪长岩锆石U-Pb年代学、地球化学和Sr-Nd-Hf同位素
Zircon U-Pb Geochronology, Geochemistry and Sr-Nd-Hf Isotopes of Diorite in Heishishan Copper Polymetallic Deposit, East Kunlun
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黑石山铜铅锌矿床位于东昆仑造山带中段的五龙沟地区,矿区内中三叠世的侵入岩十分发育,与矿体近平行产出的闪长岩为限定东昆仑地区古特提斯洋闭合时间提供了很好的研究对象.对黑石山闪长岩进行了LA-ICP-MS锆石U-Pb定年、全岩地球化学和Sr-Nd-Hf同位素分析.定年显示,黑石山闪长岩形成于241.6±1.0 Ma.样品的SiO2含量为52.23%~56.19%,全碱含量为K2O+Na2O=3.99%~6.26%,Na2O=2.79%~3.63%,K2O=1.06%~2.71%,样品富铝、钙、铁,MgO=2.55%~4.84%,TiO2=1.11%~1.43%;样品富集大离子亲石元素如Rb、Ba、K,明显亏损Nb、Ta、Ti、P等高场强元素,富集轻稀土元素,亏损重稀土元素,大多具有较为明显的Eu负异常,δEu为0.39~0.59.锆石ε Hf(t)值为-4.1~+0.7;全岩(87Sr/86Sr)t为0.708 860~0.708 960,ε Nd(t)为-4.5~-4.3.综合研究认为,黑石山闪长岩为壳幔混合成因,结合区域构造演化历史,认为其形成于俯冲构造背景,指示东昆仑地区古特提斯洋闭合晚于241.6 Ma.
东昆仑 / 闪长岩 / 锆石U-Pb定年 / Sr-Nd-Hf同位素 / 壳幔混合 / 矿床 / 年代学
East Kunlun / diorite / zircon U-Pb dating / Sr-Nd-Hf isotope / crust-mantle mixing / ore deposit / geochronology
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青海省地质勘查专项基金项目(2023085029ky004)
山金西部地质矿产勘查有限公司科技创新项目(2022-1014)
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