晋南塔儿山地区夕卡岩型铁矿岩浆岩特征及对成矿的控制作用

THE MAGMATISE AND ITS CONTROL TO THE SKARN IRON DEPOSITS IN TARSHAN AREA IN SOUTHERN SHANXI PROVINCE

燕山期偏碱性中性—弱碱性岩浆岩受区域构造控制,在塔儿山地区广泛发育,随其侵入活动的阶段性在岩石学、岩石化学方面表现为明显的前进演化规律.在四个侵入阶段中,第一阶段侵入的正长闪长岩是该区铁矿最主要的成矿母岩.岩浆受围岩中奥陶统镁质碳酸盐岩层间构造控制,多顺层侵入,有多个接触带且有多层成矿的可能,属夕卡岩型铁矿.成矿主要受岩浆岩、围岩、构造控制,而岩浆岩在成矿过程中起到了重要作用.本文从岩浆岩的特征到对成矿的控制作用,综合磁异常提出了该区的找矿方向.

Yanshanian meta-alkalic intermediate-weak alkalic magmatic rocks, which are controlled by regional tectonics, are broadly spread in Tarshan area, Southern Shanxi Province. The magmatic rocks show evident progressive evolution in petrology and petrochemistry with four-phased intrusions. The first phase intrusive syenodiorite is the major parent rock for the iron deposits in the area. The magmatic rock is controlled by the interformational structure of Middle Ordovician magnesian carbonate strata. Magma intruded along beds and possibly formed multi-layers of ore. The ore is skarn type in genesis, mainly controlled by the magmatic rock, the intruded carbonate rock and the interformational structure. The magmatic rock played an important role in the metallogenic process. Based on features of the magmatic rock and its control on the ore, together with the magnetic anomalies, the authors put forth ore-searching directions in the area.