Abstract: The Baiyinnuo large and high-grade Pb-Zn deposit in Inner Mongolia is a representative skarn-type one. In the ore district skarns extensively developed and the Mn-clinopyroxene skarn most closely related to the metallization. The clinopyoxene mainly crystallized in two stages: the earlier one was rich in Mg and poor in Fe and Mn, with diopside formed at higher temperture, fO₂ and pH; the laterone, Fe-and Mn-rich manganhedenbergite, formed under the condition of lower temperture, fO₂ and pH and closely related to the Pb-Zn metallization. The changes of fluid flow from southeast to northwest of the ore district resulted in the zoning of skarn and metallization. The manganhedenbergite can be condsidered as an important indicator for Pb-Zn metallization.

Key words: Mn-rich manganhedenbergite, Pb-Zn deposit, Baiyinnuo

摘要： 内蒙古白音诺铅锌矿床是我国北方一个典型的矽卡岩矿床，具有大而富的特点。矿区矽卡岩广泛发育，富锰单斜辉石矽卡岩与矿化的关系最为密切。单斜辉石主要为两期形成。早期富Ｍｇ、贫Ｆｅ、Ｍｎ的透辉石形成于较高的温度、ｆＯ₂和ｐＨ条件下；晚期富Ｆｅ、Ｍｎ的锰钙铁辉石形成于较低的温度、ｆＯ₂和ｐＨ条件下，后者与铅锌矿化具有密切的时空关系。成矿流体自矿区南西向北东方向流动过程中物理化学条件的改变，是造成矽卡岩矿物及矿化分带的主要原因。锰钙铁辉石可以作为铅锌矿化的重要标志。

关键词: 富锰单斜辉石, 白音诺, 铅锌矿床