松桃嗅脑铅锌矿田藻丘微相特征及控矿规律探讨

Features of Algal Mound Microfacies and Its Constrain on Pb-Zn Ore Field in Chounao, Songtao, Guizhou

松桃嗅脑铅锌矿是产于下寒武统清虚洞组的藻灰岩段（即藻生物丘）中，铅锌矿的分布和产出，严格受藻丘的控制。本文首次对藻丘内部沉积微相进行了系统划分，划分出丘坪、丘前沿、丘冠微相及后丘、前丘和丘间通道亚相，并对各微相（亚相）特征及控矿特征进行阐述，提出了嗅脑铅锌矿田矿体主要受丘坪微相的控制，其次为丘前沿微相。这一认识无疑对矿床地质特征研究和成矿预测具有重要意义。

The Chounao Ph--Zn ore field situated in Songtao, eastern Guizhou, is stricly hosted by the algal limestone beds, i. e., representing an organic mound factes, of Qingxudong Formation of the lower Cambrian. In the paper is given a first systematical subdivision of this algal mound factes into mound flat, mound leading-edge, mound cap, backmound, foremound, and intermound channel, and a description of each algal mound micro factes in detail The studies on the relation of the algal mound to orebodies confirm that the formation of the Ph--Zn ore deposits is predominantly controlled by the algal mound flat microfacies,secondly by the leading edge of the mound. In author's opinion, this conclusion is of practice to predict and further explore some hiding Ph--Zn deposits in this ore field.