辽宁三道沟古元古代矿体特征分析研究

Characteristics analysis of ancient Proterozoic orebody in the three channel of Liaoning

通过构造环境分析,古元古代侵入岩由造山早期至晚期,三道沟岩体投影点落在同碰撞期,盘道岭各投影点多投入造山晚期内,古元古代侵入岩由造山早期至晚期,构造环境由碰撞挤压向造山晚期松弛阶段演化。通过岩浆就位机制探讨,元古代造山早期在伸展的构造环境下,三道沟岩体沿太古宙与辽河群的构造薄弱带同构造就位。古元古代造山晚期在挤压的构造环境下,三道沟岩体与辽河群同步褶皱,并活化重就位,此时盘道岭岩体同构造就位。通过分析古元古代侵入岩岩石矿物成分及含量,矿物的电子探针分析,三道沟岩体岩性为灰白色中细粒条痕状黑云母二长花岗岩,主要矿物成分有斜长石、钾长石、石英、黑云母及少量角闪石。并且经三道沟岩体与辽宁二长花岗岩对比,具高硅、铝、钠,低钙、钾的特点,为铝过饱和的钙碱性系列岩石。

Through the analysis of tectonic environment, Proterozoic intrusive rocks from early to late orogenic, three channel rock projection point fall in the same collision period, Pandaoling each projection point into the late orogenic, Proterozoic intrusive rocks from early to late orogenic, tectonic environment by collision orogenic evolution to the late stage of relaxation. Based on the emplacement mechanism of magma, the three channel rock mass is tectonically located along the weak tectonic belt of the Archean and Liaohe groups in the extensional tectonic setting during the early Proterozoic orogeny. In the late Paleoproterozoic orogenic tectonic compression environment, three channel rock and Liaohe Group synchronous folds, and the activation of heavy rock in place, the Pandaoling syntectonic emplacement. The intrusive rock mineral composition and content through the analysis of Paleoproterozoic, electron microprobe analysis of minerals, the three groove rock lithology is fine white striped two biotite granite, main minerals are plagioclase, K-feldspar, quartz, biotite and minor hornblende. And through the three channel rock and Liaoning two long granite contrast, with high silicon, aluminum, sodium, low calcium and potassium characteristics, for aluminum supersaturated calc alkaline series rock.