| 东天山大型韧性剪切带基本特征与金矿预测 |
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| 引用本文： | 杨兴科,姬金生.东天山大型韧性剪切带基本特征与金矿预测[J].大地构造与成矿学,1998,22(3):209-218. |
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| 作者姓名： | 杨兴科 姬金生 |
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| 作者单位： | 西安工程学院资源系 |
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| 摘 要： | 东天山大型韧性剪切带即秋格明塔什-黄山韧性剪切带，规模宏大，东西长逾600km，宽5～20km。变形标志明显，分四期变形。应变测量、岩组分析、剪切位移量计算、同位素测年等定量分析表明：①以平面单剪应变为主，稍晚向伸长应变转化；②存在逆冲剪切和脆-韧性变形转换；③剪切位移量在75km以上；④变形时代在300～250Ma之间，高峰期在285～265Ma，属海西中晚期。它是康-黄断裂带的重要组成体，控制着康古尔塔格金矿带的空间展布。据现有大中型金矿研究建立了区域脆-韧性变形转换带结构模式和金矿预测模式，可有效指导找矿勘探。
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| 关 键 词： | 韧性剪切带 脆-韧性变形转换 变形特征 金矿预测 东天山 |
BASIC FEATURES AND GOLD PROGNOSIS OF THE REGIONAL DUCTILE SHEAR ZONE IN EASTERN TIANSHAN |
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| Abstract: | The Qiugamintashi-Huangshan large-scale ductile shear zone in Eastern Tianshan is 600 km long in east-west and 5～20 km wide. It is divided into four phases with clear deformation signs. It is obvious by strain measure, petrofabric analysis, shear displacement amount counting and isotopic dating that ① the ductile shear zone's deformation belongs to plane simple-shear strain, and later the deformation translates into extensional strain. ② there are thrust shear and brittle - ductile deformation transition. ③ the amount of shear displcement is over 75 km, and ④ deformation occurred in 300～250 Ma, with the peak stage in 28b ～ 265 Ma, belonging to the mid-late Hercynian. It is the main component of the Kangguertage-Huangshan deep fracture zone, which controlled the distribution of the Kangguertage gold belt. A model for gold prognosis and regional brittle-ductile shear deformation transition was set up by study of the known large-and middle-scale gold deposits. |
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| Keywords: | ductile shear zone brittle-ductile shear deformation transition deformation features gold prognosis Eastern Tianshan |
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