关键词： 流纹英安斑岩；锆石U-Pb年龄；中志留世；东昆仑造山带 [gap=1558]Key words: rhyolite-dacite porphyry; zircon U-Pb dating; Middle Silurian; eastern Kunlun orogenic belt
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Lower-Middle Silurian 中下志留统
The sedimentary environment of Middle Silurian is also involved.
分析了该区中志留世的沉积环境及变化特征。
Unless the upper part of Ningqiang Formation maybe belongs to Middle Silurian, the others belong to lower Silurian.
本区绝大部分地层为下志留统，只有宁强组上部可能为中志留统。
The lead-zinc deposits occur in the Lower Silurian Meiziya Formation, Middle Silurian Shuanghezhen Formation, Middle Devonian Dafenggou Formation and Upper Devonian Nanyangshan Formation.
铅锌矿赋存于下志留统梅子垭组、中志留统双河镇组及中泥盆统大枫沟组、上泥盆统南羊山组；
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