Zircon U-Pb Geochronology, Geochemistry and Hf Isotopic Compositions of Dacitic Porphyry in Zoujiashan Deposit of Xiangshan Uranium Orefield and Its Geological Implication
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摘要: 对首次在相山铀矿田邹家山矿床发现的英安斑岩脉开展了岩石地球化学、锆石U-Pb年代学和Hf同位素地球化学研究.LA-ICP-MS锆石U-Pb年龄测试结果表明：两个英安斑岩脉样品年龄加权平均值分别为122.4±0.5 Ma和126.5±1.4 Ma，晚于相山大规模火山侵入活动时间(132~137 Ma).该岩脉具有明显的轻重稀土分馏、负Eu异常的特征，大离子亲石元素明显富集，Nb、Ta显示明显的负异常，锆石εHf(t)值为-22.0~0.2，且大多数集中在-6~-10之间，两阶段Hf模式年龄tDM2为1.17~2.58 Ga.相山英安斑岩脉的地球化学特征与相山火山岩、次火山岩具有一定相似性.微量元素和锆石Hf同位素分析结果显示，英安斑岩脉主要为硅铝质地壳物质的部分熔融形成，但不排除有地幔物质的混入.邹家山英安斑岩脉以及同时期的中基性脉岩很可能形成于早中白垩世时期的太平洋俯冲板片持续后撤引起的岩石圈伸展环境，是典型张性构造应力体制的产物.Abstract: Geochemistry,zircon U-Pb geochronology and Hf isotopic compositions of dacitic porphyry discovered in the Zoujiashan deposit were studied for the first time in Xiangshan uranium deposit. The LA-ICP-MS zircon U-Pb age testing results show that the average weighted age of two samples collected from underground tunnel and open pit were 122.4±0.5 Ma and 126.5±1.4 Ma,respectively,which were formed much later than the large-scale volcanic-intrusive activity. The rock is characterized by negative Eu anomalies,light-heavy REE fractionation,enrichment of large lithophilic elements as well as negative anomalies in Nb and Ta. The zircon εHf(t) values range from -22.0 to 0.2,most of which are concentrated between -6 and -10,and the two-stage Hf model age tDM2 range from 1 170 to 2 575 Ma,which share the similar characteristics with the Xiangshan volcanic rocks and subvolcanic rocks. The trace element and zircon Hf isotopic analysis showed that the dacitic porphyry was mainly derived from partial melting of crust material,but the participation of mantle material could not be ruled out. In combination with previous data,it is believed that the dacitic porphyry and the intermediate-basic dikes were probably formed in the lithospheric extension environment caused by the continuous retreat of the Pacific subduction plate during the Early-Middle Cretaceous period,and were the typical products of the lithospheric thinning in South China.
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Key words:
- dacitic porphyry /
- LA-ICP-MS zircon U-Pb age /
- Hf isotope /
- Zoujiashan deposit /
- Xiangshan orefield /
- geochemistry /
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图 1 相山铀矿田大地构造位置(a)及地质简图(b)
1.上白垩统砂砾岩；2.碎斑熔岩；3.凝灰岩、粉砂岩；4.流纹英安岩；5.凝灰质粉砂岩、凝灰岩、熔结凝灰岩；6.上三叠统石英砂岩、页岩/下石炭统浅变质石英砂岩；7.中元古界片岩、千枚岩；8.花岗斑岩；9.石英二长斑岩；10.煌斑岩；11.辉绿岩；12.加里东期花岗岩；13.断裂；14.样品采集点
Fig. 1. Tectonic location (a) and geological sketch map (b) of Xiangshan uranium orefield
图 2 英安斑岩脉野外及显微镜下照片
a.英安斑岩脉穿切流纹英安岩(邹家山矿床-130 m中段)；b.英安斑岩中含有碎斑熔岩捕掳体(邹家山露天采场)；c, d.英安斑岩样品Z15-245和XS16-11-8的镜下显微照片(正交偏光); ξμ.英安斑岩脉；K1d2.流纹英安岩；Pl.斜长石；Qz.石英
Fig. 2. Field photos and micrographs of dacitic porphyry dyke
图 3 相山邹家山矿床英安斑岩脉(a)TAS分类图解和(b)SiO2-K2O图解
Fig. 3. TAS classification diagram (a) and SiO2 versus K2O diagram (b) of dacitic porphyry in Zoujiashan deposit
图 4 相山邹家山矿床(a)英安斑岩脉原始地幔标准化微量元素蛛网图和(b)球粒陨石标准化稀土元素配分图
a.标准化值据McDonough and Sun(1995)；b.流纹英安岩、碎斑熔岩、花岗斑岩的地球化学数据引自Jiang et al.(2005)和Yang et al.(2011)
Fig. 4. Primitive mantle normalized trace element spider diagram (a) and chondrite normalized REE patterns (b) of dacitic porphyry in Zoujiashan deposit
图 5 邹家山矿床英安斑岩脉中典型锆石的阴极发光图像及测点位置
实心圈和虚线圈分别代表U-Pb, Lu-Hf同位素测定位置, 下标数字分别为206Pb/238U年龄和
Fig. 5. CL images and testing point of representative zircons in dacitic porphyry dyke of Zoujiashan deposit
图 6 邹家山矿床英安斑岩脉U-Pb谐和年龄曲线
Fig. 6. U-Pb concordiadiagrams of zircon from dacitic porphyry dyke of Zoujiashan deposit
图 7 邹家山矿床英安斑岩脉的Hf同位素两阶段模式年龄和εHf(t)值柱状图
Fig. 7. Histogram of Hf model ages and εHf(t) values for dacitic porphyry dyke of Zoujiashan deposit
图 8 邹家山矿床英安斑岩脉锆石Hf同位素组成
Fig. 8. Zircon Hf isotope of dacitic porphyry dyke from Zoujiashan deposit
图 9 邹家山矿床英安斑岩脉岩浆混合趋势
Fig. 9. Magma mixing trend diagram of dacitic porphyry dyke from Zoujiashan deposit
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