摘要
水磨沟钒矿床位于米仓山推覆构造与四川盆地耦合部位,赋矿层位为上二叠统吴家坪组一段,钒矿石类型为含黄铁矿黏土岩型和碳质泥岩(页岩)型。通过对矿石及围岩进行主量元素、微量元素和稀土元素分析测试,结果显示:钒矿石SiO_(2),Al_(2)O_(3)和Fe_(2)O_(3)含量相对较高,其中w(SiO_(2))24.35%~54.84%,w(Al_(2)O_(3))7.71%~27.43%,w(Fe_(2)O_(3))1.58%~8.73%;Li,V,Cr,Cu,Rb,Mo等微量元素比较富集;经过北美页岩标准化,钒矿石稀土元素总量(ΣREE)173.65×10^(-6)~434.00×10^(-6),LREE/HREE比值3.70~13.09,LREE相对富集;δEu值1.01~1.32,δCe值0.74~0.95,Eu具正异常,Ce表现为负异常。钒矿石n(SiO_(2))/n(Al_(2)O_(3))比值1.60~3.25,n(Al)/n(Al+Fe+Mn)比值0.66~0.90,Ba/Sr比值0.17~1.83,判断其物源为陆源,海相热水沉积与生物作用参与成矿。在(La/Ce)-Al_(2)O_(3)/(Al_(2)O_(3)+Fe_(2)O_(3)),Fe_(2)O_(3)/TiO_(2)-Al_(2)O_(3)/(Al_(2)O_(3)+Fe_(2)O_(3))及Fe_(2)O_(3)/(100-SiO_(2))-Al_(2)O_(3)/(100-SiO_(2))图解中,表明水磨沟钒矿床形成于大陆边缘向远洋深海过渡环境。钒矿体呈层状产出,受地层、岩性、岩相古地理、构造联合控制,矿床成因为滨岸沼泽相沉积型层控矿床。
Shuimogou vanadium deposit is located in the coupling position of Micangshan nappe structure belt and Sichuan Basin.The vanadium ore occurs as a layer hosted in the first member of the Upper Permian Wujiaping Formation,which is the pyrite-bearing clay rock type and carbonaceous mudstone(shale)type.Analysis and test results of major elements,trace elements and rare earth elements for ore and surrounding rock show that the contents of SiO_(2),Al_(2)O_(3)and Fe_(2)O_(3)in vanadium ores are relatively high(w(SiO_(2))=24.35%-54.84%,w(A1_(2)O_(3))=7.71%-27.43%,w(Fe_(2)O_(3))=1.58%-8.73%).Trace elements Li,V,Cr,Cu,Rb and Mo are relatively enriched.After the standardization of North American shale,the total amount of rare earth elements(ΣREE)in vanadium ore is 173.65×10^(-6)-434.00×10^(-6),LREE/HREE ratio is 3.7-13.09,and LREE is relatively enriched.δEu is 1.01-1.32,δCe is 0.74-0.95,Eu has a positive anomaly,and Ce has a negative anomaly.n(SiO_(2))/n(Al_(2)O_(3))ratio of vanadium ore ranges from 1.60to 3.25,n(Al)/n(Al+Fe+Mn)ratio from 0.66to 0.90,Ba/Sr ratio from 0.17to 1.83,indicating that the ore provenance was terrestrial sources and marine hydrothermal deposition and biological processes were also involved in mineralization.The diagrams of(La/Ce)-Al_(2)O_(3)/(Al_(2)O_(3)+Fe_(2)O_(3)),Fe_(2)O_(3)/TiO_(2)-Al_(2)O_(3)/(Al_(2)O_(3)+Fe_(2)O_(3))and Fe_(2)O_(3)/(100-SiO_(2))-Al_(2)O_(3)/(100-SiO_(2))indicate that the Shuimogou vanadium deposit was formed in the transitional environment from continental margin to pelagic ocean.It is considered that the vanadium deposit is controlled by stratigraphy,lithology,lithofacies,palaeogeography and structure,and is formed as a littoral marsh sedimentary strata-controlled deposit.
作者
凌亚军
唐虎
唐军华
李俊
田小林
郭道军
Ling Yajun;Tang Hu;Tang Junhua;Li Jun;Tian Xiaolin;Guo Daojun(106 Geological Brigade of Sichuan Bureau of Geology and Mineral Resources,Chengdu,Sichuan611130,China)
出处
《矿物岩石》
CAS
CSCD
北大核心
2022年第3期34-47,共14页
Mineralogy and Petrology
基金
四川省政府性投资地质勘查项目“四川省旺苍县水磨沟钒矿预查”(项目编号:DZ202014)。
关键词
钒矿床
地质特征
矿床成因
四川米仓山
水磨沟
vanadium deposit
geologic features
ore genesis
Micang Mountain of Sichuan Province
Shuimogou
