【摘要】：四川鹽源西范坪斑巖銅礦處于揚子地塊西緣,靠近鹽源-麗江坳陷帶與甘孜-理塘縫合帶的結(jié)合部位,該礦區(qū)侵入巖體主要為石英二長斑巖組成。西范坪銅礦石英二長斑巖LA-ICP-MS鋯石U-Pb年齡為(100.8±0.7)Ma(MSWD=0.2),表明了斑巖侵位時代為早白堊世。石英二長斑巖富集大離子親石元素(Rb、Ba、K),虧損高場強元素(Nb、Ta、Ti、P),LREE富集、HREE虧損,為高鉀準鋁質(zhì)花崗巖。w(Si O2)為64.06%~65.24%,具有高w(Al_2O3)(15.58%~16.55%)、w(Sr)(719×10~(-6)~1221×10~(-6))及Sr/Y比值(49.2~82.5),低w(MgO)(1.30%~1.63%)、w(Yb)(1.08×10~(-6)~1.55×10~(-6))及w(Y)(13.7×10~(-6)~14.8×10~(-6)),Eu異常(0.83~0.90)不明顯,輕重稀土分異明顯((La/Yb)N=29.94~52.14),具有埃達克巖特征。西范坪埃達克巖富鉀貧鈉(K_2O/Na_2O=0.78~2.44),低Cr、Ni,高Th、Th/U以及相對低的Sr/Y等特征,表明其為加厚下地殼部分熔融形成。西范坪早白堊世(100.8Ma)地殼增厚作用可能受控于甘孜-理塘洋閉合后的造山運動,該斑巖體為印支期褶皺造山后(200 Ma),喜馬拉雅期碰撞造山之前(65 Ma),陸內(nèi)由擠壓向伸展轉(zhuǎn)換期巖漿作用的產(chǎn)物。
[Abstract]:The Xifangping porphyry copper deposit in Yanyuan, Sichuan is located in the western margin of the Yangtze block and is close to the joint site of the Yanyuan-Lijiang depression belt and the Ganzi-Litang suture zone. The intrusive rock mass of the mine is mainly composed of quartz monzonitic porphyry. The LA-ICP-MS zircon U-Pb age of Yingerpeng porphyry from Xifangping copper ore is (100.8 鹵0.7) Ma (MSWD=0.2), indicating that the porphyry emplacement was early Cretaceous. Quartz monzomorphic porphyry is rich in large ion lithophile elements (Rb,Ba,K), depleted high field strength elements (Nb,Ta,Ti,P), LREE enrichment, HREE depletion, high potassium pseudoaluminous granite. W (Si O2), and is 64.06% 65.24%. High w (Al_2O3) (15.58%), w (Sr) (719 脳 10 ~ (-6) ~ 1221 脳 10 ~ (-6) and Sr/Y ratio (49.2%), low w (MgO) (1.30% (1.63%), W (Yb) (1.08 脳 10 ~ (-6) ~ 1.55 脳 10 ~ (-6) and w (Y) (13.7 脳 10 ~ (-6) ~ 14.8 脳 10 ~ (-6), Eu anomaly (0.83 ~ (-6) 0.90) were not obvious, and the difference of light and heavy rare earth elements (La/Yb) was obvious (La/Yb) N ~ (29. 94) ~ (52.14). It has the characteristics of adakite. It is characterized by rich potassium and poor sodium (K_2O/Na_2O=0.78~2.44), low Cr,Ni, high Th,Th/U and relatively low Sr/Y in Xifangping Adakite, which indicates that it is formed by partial melting of thickened lower crust. The crustal thickening of the early Cretaceous (100.8Ma) in Xifangping may be controlled by the orogenic movement after the closure of the Ganzi-Litang Ocean, which occurred after the Indosinian fold orogeny (200 Ma), before the collision orogeny of the Himalayas) (65 Ma),). The product of magmatism during the transition from compressional to extensional within the continent.
【作者單位】： 成都地質(zhì)礦產(chǎn)研究所;
【基金】：中國地質(zhì)調(diào)查局地質(zhì)調(diào)查項目(DD20160016;12120113036500)
【分類號】：P597.3;P618.41

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