摘要
特克斯基性岩体是伊犁地块中部基性岩带中一个规模较大的似层状侵入体,其年龄为277-298Ma,系华力西运动晚期产物。它侵入于早中石炭统的火山-沉积建造岩系,其形态和产状受先期火山机构的破火口控制。岩体中主要岩石类型为辉绿辉长岩和橄榄辉绿辉长岩。岩石的m/f值为1.67-3.52,(La/Yb)N值为1.72-2.39。岩石中造岩矿物主要为斜长石(An_(55.17-82.32))、单斜辉石(En_(35.81-47.07) Fs_(8.89-17.62) Wo_(41.15-49.88))和橄榄石(Fo_(56.10-18.28))。研究结果表明,该岩体的岩浆经历了深部分异、多次侵入和就地分异这样一个复杂的演化过程;母岩浆属钙碱性玄武岩系列;成岩温度为1230-640℃;成岩压力约0.2GPa。矿物和岩石化学特征反映的该侵入体的成矿专属性属Fe-Ti-V与Cu-Ni-Pt两系列间的过渡类型。目前所见到的矿化现象主要为一些铁铜硫化物的局部富集;铜含量最高可达2.63％;铂、钯、金、银与铜密切相关。文中根据地质和物化探成果对岩体找矿前景作了初步评价,并提出了今后工作建议。
Tekes basic body is a relatively bigger stratoid intrusive beloging to the basic zone in the middle part of Ill block, its age being 277-298Ma, and formed in the late Variscian movement. It intruded into the rocks of C<sub>1</sub> and C<sub>2</sub> volcanic-sedimentary formation, and its occurrence and shape controled by the caldera of previously volcanic apparatus. The main rock typies of the intrusive are diabase gabbro and olivine diabase gabbro with m/f 1.67-3.52 and （La/Yb）<sub>N</sub> 1.72-2.39. The rock-forming minerals in the rocks have principally plagioclas(An<sub>55.17-82.32</sub>), clinopyroxen (En<sub>35.81-47.07</sub> Fs<sub>8.89-17.62</sub> Wo<sub>41.15-49.88</sub>) and olivine (Fo<sub>56.10-78.28</sub>). The result of study indicates that the magma of Tekes basic body undergone such complex evolution process as differatiation in the deepths, multiple intrusion and differentiation on the spot. Its parent magma belonged to calc-alkaline basaltic series. The disgenetic temperature was 1230-640 ℃ and pressure 0.2 Gpa. The metallogenetic special property of the intrusive belongs to transitional type between Fe-Ti-V and Cu-Ni-Pt series based on the chemical characteristics of the minerals and rocks. The observed mineralization phenomens at present is mainly local enrichment of some Fe-Cu sulfides, and the maximum of Cu content is as high as 2.63%. The elements such as Pt, Pd, Au and Ag are in close relationship with Cu. At the last of the professional paper, the ore-finding prospect is tentatively appraised and the further work proposals is put forword for the basic body on the basis of the geologcal, geophysical and geochemical survey achievements.
出处
《西北地质科学》
1991年第3期95-144,共50页
Northwest Geoscience
关键词
特克斯
基性岩体
地质特征
找矿方向
prospects Tekes
basic body
geological characteristics
ore-finding
