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本文指出云龙铁厂锡矿的含矿岩石(围岩)为一套变晶碎裂岩,其原岩应是岩浆花岗岩。岩石具有较强的碎裂变形。主要矿物钾长石、斜长石在岩石中呈碎裂斑晶;石英少数为压碎残留,多数重结晶,形成微粒状的结合体,充填于碎斑的裂隙和粒间。黑云母、白云母及多硅白云母的鳞片集合体在岩石中成条纹及条带,与重结晶的石英集合体和长石碎斑相间分布,形成条纹或条带状变晶碎裂岩;在条纹条带不发育的部位,成为角砾状变晶碎裂岩。以岩石碎斑中较多的残留结构及矿物成分、岩化特点、硫同位素、稀土元素的特征等作为恢复原岩的依据,认为原岩是岩浆花岗岩;它在特定的构造环境中,经断裂变质作用形成变晶碎裂岩,也可称变晶花岗碎裂岩。
This paper points out that the ore-bearing rocks (the surrounding rocks) of the Yunlong Iron Works tin deposit are a set of metamorphic crushed rocks and the original rocks should be magmatic granites. The rock has strong fragmentation. The main mineral potassium feldspar and plagioclase are fragmented porphyritic in the rock. A small number of quartz are crushed residue, and most recrystallize to form a granular combination, which fills the cracks and grains in the crickets. Tribal assemblages of biotite, muscovite and polyphosgene become stripes and bands in the rock and are distributed alternately with recrystallized quartz aggregates and feldspar fragments to form striped or banded metamorphic crushed rocks. In the stripe zone is not developed, become brecciated deformed cataclastic rock. Based on the more residual structure and mineral composition, petrochemical characteristics, sulfur isotopes and rare earth elements in the rock crust, the original rock is considered to be magmatic granite. In the specific tectonic setting, it is fractured Metamorphism to form metamorphic crushed rocks, also known as metamorphic granitic cataclastic rocks.