ANALYSIS ON THE KAIYATASI VOLCANIC APPARATUS AND ITS METALLOGENETIC POTENTIALITY IN GUOZHIGOU AREA OF THE WESTERN TIANSHAN, XINJIANG OF CHINA
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摘要: 新疆西天山地区的早石炭世古火山机构是形成金矿床的重要构造。本文通过对新疆西天山果子沟地区开亚他斯古火山机构的形成时代、岩石类型、火山岩相、喷发旋回、喷发韵律、成矿条件的调查研究, 初步确定开亚他斯古火山机构形成于331Ma±2Ma(早石炭世), 为一套钙碱性系列岩石组合, 具有爆发相—喷溢相—爆发相的火山活动特征, 火山岩中金、锑、铋、锌、钼元素背景值较高, 有形成阿希火山岩型金床的成矿背景和潜力。Abstract: The Early Carboniferous volcanic apparatus is an important metallogenetic structure for formation of gold deposit in the Western Tianshan.A study on the formation time of the volcanic apparatus, rock types, volcanic facies, eruptive cycles and metallogenetic conditions shows that the volcanic apparatus was formed about 331Ma ago, associated with calc-alkaline series rocks, and bearing volcanic cycle from explosive facies to extrusive facies and then to explosive facies.The volcanic rock has a higher background values of Sb, Pb, Mo, Bi, Au, So, constituting a good conditions for formation of the volcanogenic massive sulfide deposit.
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Key words:
- volcanic apparatus /
- volcanic rocks /
- metallogenetic potentiality /
- Western Tianshan /
- Kaiyatasi
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图 1 果子沟地区地质略图
1.第四系; 2.渐新世—上新世昌吉河群; 3—早二叠世乌郎组; 4—晚石炭世伊什基里克组; 5.早石炭世大哈拉军山组; 6.早志留世尼勒克河组; 7.晚奥陶世呼独克达坂组; 8.中奥陶世科克萨雷溪组; 9.早—中奥陶世新二台组; 10.寒武系; 11.南华—震旦纪凯拉克提群; 12.青白口纪开尔塔斯群; 13.晚石炭世霍尔果斯序列花岗岩; 14.早二叠世果子沟序列花岗岩; 15.地质界线/不整合界线; 16.逆断层/平移断层
Figure 1. Geological map of the Guozigou Area
图 2 开亚他斯火山机构岩性岩相地质图
Figure 2. Lithological and petrographic sketch of the Kaiyatasi volcanic apparatus
图 3 开亚他斯火山机构火山岩旋回、岩相、韵律柱状图
Figure 3. Column of the eruptive cycles, lithofacies and rhythems of the Kaiyatasi volcanic apparatus
图 4 开亚他斯火山机构火山岩TAS图解
Figure 4. Diagram of TAS for volcaic rocks of the Kaiyatasi volcaic apparatus
图 5 开亚他斯火山机构火山岩AFM图解
Figure 5. Diagram of AFM for volcanic rocks of the Kaiyatasi volcanic apparatus
图 6 开亚他斯火山机构火山岩硅碱图解
Figure 6. Diagram of (Na2O +K2O)/SiO2 for volcanic rocks of the Kaiyatasi volcanic apparatus
图 7 开亚他斯火山机构火山岩稀土元素球粒陨石标准化图
Figure 7. REE patterns for volcanic rocks of the Kaiyatasi volcanic apparatus
图 8 开亚他斯火山机构火山岩微量元素比值蛛网图
Figure 8. Trace element spidergram of volcanic rocks of the Kaiyatasi volcanic apparatus
图 9 开亚他斯火山机构火山岩Rb-Sr等值线图
截距:0.70832±0.00014 斜率:0.00471±0.00003 年龄:331Ma ±2Ma (10′)
Figure 9. Rb-Sr isochron of the volcanic rocks of the Kaiyatasi volcanic apparatus
表 1 开亚他斯火山机构火山岩岩石化学特征表
Table 1. Chemical compositions of volcanic rocks of the Kaiyatasi volcanic apparatus
表 2 开亚他斯火山机构火山岩稀土元素特征表
Table 2. REE data of volcanic rocks of the Kaiyatasi volcanic apparatus
表 3 开亚他斯火山机构火山岩微量元素特征表
Table 3. Trace elements of volcanic rocks of the Kaiyatasi volcanic apparatus
表 4 开亚他斯火山机构火山岩铷锶同位素年龄测试结果表
Table 4. Rb-Sr isotope of volcanic rocks of the Kaiyatasi volcanic apparatus
表 5 开亚他斯火山机构火山岩成矿元素丰度表(定量光谱结果)
Table 5. Metallogenetic element data of volcanic rocks of the Kaiyatasi volcanic apparatus
表 6 阿希古火山机构与开亚他斯古火山机构对比表
Table 6. Contrast of structure between Axi ancient volcano apparatus and Kaiyatasi volcano apparatus
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