Formation Mechanism and Implication to Ore-Forming of Xinfang Metamorphic Core Complex in Liaodong Peninsula
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摘要: 辽东半岛广泛分布变质核杂岩构造，作为华北克拉通破坏的浅部响应，具有重要的构造演化研究意义.新房变质核杂岩是近年来新发现的伸展构造单元，具备典型的三层结构：上盘主要包括新元古代-古生代弱变形沉积岩层和早白垩世庄河断陷盆地，下盘包括新太古代变质基底和同构造中生代花岗质侵入岩体，二者接触部位为拆离断层带.野外宏观运动学及显微构造特征明显，均指示上盘具由SEE向NWW的运动学特征，与太平洋板块早白垩世早-中期运动方向相吻合.本次工作通过锆石LA-ICP-MS U-Pb同位素及常量、稀土和微量元素测试，将新房变质核杂岩的形成时代大致限定于早白垩世早期（123~125 Ma），并进一步明确为华北克拉通破坏事件的早期产物.该变质核杂岩控制了区内新房大型金矿的生成，在辽东半岛变质核杂岩控矿、成矿较差的现状下，研究意义较大.Abstract: As shallow responses to the destruction of North China craton,metamorphic core complex structures,which are widely distributed in Liaodong Peninsula,are of great significance to study the regional tectonic evolution. Xinfang metamorphic core complex is a newly discovered extensional unit with typical 3-layers structure. The hanging wall includes weakly deformed sedimentary strata from Neoproterozoic to Paleozoic and Zhuanghe faulted basin formed in Early Cretaceous. The footwall includes Archean metamorphic rocks and Mesozoic syntectonic granitic intrusive rocks. The contact relationship between the hanging wall and footwall is a detachment fault zone.The macroscopic characteristics in the field and microstructural characteristics under the microscope are obvious,indicating that the hanging wall has the kinematical characteristic from SEE to NWW,which is consistent with the movement direction of the Pacific plate during the early and middle period of Early Cretaceous. Using the method of LA-ICP-MS U-Pb isotope testing on zircons and testing of major,rare earth and trace elements,the forming age of the Xinfang metamorphic core complex is approximately limited to the early stage of Early Cretaceous(123-125 Ma),and the complex is regarded as a product of the destruction of the North China craton. The metamorphic core complex controls the formation of Xinfang large-scale gold deposit,and the research on the complex is of great significance under the situation that present complexes in Liaodong Peninsula have weak relationship with gold mineralization.
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图 1 新房变质核杂岩宏观运动特征野外露头
a.剥离断层上盘桥头组薄层石英砂岩中剪切褶皱，指示上盘向西下滑（镜向320°）；b.黑云斜长质糜棱岩中，构造分异长英质脉剪切褶皱，指示上盘由东向西运动（镜向350°）；c.黑云斜长质糜棱岩中，构造分异长英质脉剪切褶皱，指示上盘由东向西运动（镜向30°）；d.黑云斜长质糜棱岩中，眼球状构造及拖尾（镜向350°）
Fig. 1. Field outcrops of macroscopic movement characteristics of Xinfang metamorphic core complex
图 2 新房变质核杂岩糜棱岩显微组构
a.黑云斜长质糜棱岩中绿帘石与斜长石形成“眼球”（×50）；b.二云斜长质糜棱岩中的白云母鱼（×50）；c.S-C构造及旋转碎斑系（×50）；d.斜长石残斑拖尾（×50）；e.S-C组构；f.黄铁矿压力影构造
Fig. 2. Microfabric of mylonite in Xinfang metamorphic core complex
图 3 新房变质核杂岩上部盖层构造变形
a.板岩夹变质粉砂岩石香肠（顺层掩卧褶皱）；b.韧性变形层底部石英岩质糜棱岩内石香肠构造及其指向
Fig. 3. Tectonic deformation of the hanging wall of Xinfang metamorphic core complex
图 4 新房地区早白垩世花岗岩（TW02）镜下特征
Mic.微斜长石；Pla.斜长石；Qu.石英；Bio.黑云母
Fig. 4. Microscopic features of granite in the Early Cretaceous in Xinfang district
图 5 辽东半岛新房地区侵入岩锆石U⁃Pb谐和图及阴极发光图
Fig. 5. Concordia diagrams of zircon LA⁃ICP⁃MS U⁃Pb data and cathodoluminescence (CL) images of zircons for intrusive rocks in the Xinfang district of Liaodong Peninsula
图 7 花岗岩Zr+Nb+Ce+Y-FeOT/MgO图解
Fig. 7. Discrimination diagram of granite with Zr+Nb+Ce+Y-FeOT/MgO
图 8 花岗岩SiO2-FeOT/(FeOT+MgO)构造环境判别图解
Fig. 8. Discrimination diagram of tectonic settting of granite with SiO2-FeOT/(FeOT+MgO)
图 9 花岗岩Rb-Hf-Ta构造环境判别图解
Fig. 9. Discrimination diagram of tectonic settting of granite with Rb-Hf-Ta
图 10 新房变质核杂岩早白垩世构造演化模式
1.普兰店组；2.寒武系；3.南华系-青白口系；4.榆树砬子组；5.辽河岩群盖县岩组；6.辽河岩群大石桥岩组；7.早白垩世二长花岗岩；8.早白垩世花岗闪长岩；9.早侏罗世花岗闪长岩；10.新太古代变深成岩；11.拆离断层；12.断裂带
Fig. 10. Structural evolution model of the Xinfang metamorphic core complex in the Early Cretaceous
表 1 新房地区侵入岩全岩主量、稀土、微量元素分析结果
Table 1. Analysis results of whole-rock major, rare earth and trace elements for intrusive rocks in the Xinfang district
样品号 TW02-1 TW02-2 TW02-3 TW02-4 TW02-5 TW03-2 TW03-3 TW03-4 TW03-5 TW35-1 TW35-2 TW35-3 TW35-4 TW35-5 SiO2 72.69 72.68 72.80 72.33 72.22 68.83 67.79 68.04 68.50 70.97 71.72 71.72 71.15 70.89 TiO2 0.26 0.27 0.25 0.26 0.26 0.52 0.52 0.52 0.54 0.36 0.35 0.33 0.33 0.34 Al2O3 14.17 14.19 14.29 14.04 14.30 14.95 15.44 14.99 14.90 14.76 14.60 15.33 14.52 14.80 Fe2O3 0.42 0.51 0.43 0.57 0.30 1.97 1.96 2.07 2.09 1.06 1.46 1.27 1.38 1.40 FeO 1.50 1.35 1.36 1.33 1.55 1.22 1.33 1.28 1.12 1.40 1.10 1.08 0.99 1.02 MnO 0.02 0.02 0.02 0.01 0.02 0.03 0.03 0.03 0.03 0.05 0.05 0.04 0.05 0.04 MgO 0.37 0.33 0.32 0.25 0.52 1.47 1.03 1.09 1.10 0.80 0.57 0.60 0.53 0.76 CaO 1.44 1.44 1.36 1.39 1.51 2.95 3.13 2.44 2.16 0.59 0.54 0.44 0.51 0.53 Na2O 3.67 3.77 3.68 3.78 3.90 4.20 4.47 4.10 4.87 3.94 3.66 3.22 3.84 3.68 K2O 4.48 4.59 4.54 4.78 4.44 2.32 2.51 3.19 2.43 4.52 4.55 4.21 4.84 4.79 P2O5 0.071 0.066 0.058 0.064 0.068 0.210 0.200 0.210 0.210 0.100 0.080 0.040 0.100 0.070 LOI 0.63 0.52 0.55 0.57 0.53 1.46 1.51 1.58 1.77 1.38 1.46 1.63 1.30 1.32 Ce 106.00 109.00 110.00 111.00 114.00 105.00 110.00 103.00 99.50 72.72 69.21 57.92 65.73 64.42 Y 10.20 10.60 10.60 10.00 11.20 12.50 12.10 11.20 11.90 11.61 10.18 9.60 10.17 9.73 Rb 189.34 186.65 179.97 175.33 172.42 50.72 49.75 71.02 54.13 115.20 106.00 107.00 110.30 112.45 Nb 12.69 13.85 15.15 13.12 12.59 10.90 12.40 10.02 10.93 10.92 10.28 11.27 9.77 10.58 Ta 1.36 1.20 1.35 1.32 1.00 1.04 0.86 0.53 0.49 1.22 0.75 1.13 0.79 0.95 Zr 193.51 209.07 210.28 206.76 208.89 229.35 229.17 229.17 215.51 191.90 181.10 194.40 158.00 166.20 Hf 5.41 5.84 5.76 5.64 5.78 6.71 6.45 6.29 5.99 5.65 5.27 5.67 4.95 4.77 
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