摘要
龙桥铁矿床是安徽省庐枞矿集区中大型铁矿床。矿床主矿体呈似层状赋存于三叠系东马鞍山组泥灰岩、角砾状灰岩、白云岩、泥质粉砂岩和石英砂岩中,前人研究认为矿区内正长岩侵入体与成矿关系密切。随着龙桥矿床的生产勘探,在矿区0线井下巷道开拓发现了辉长闪长岩侵入体。辉长闪长岩岩体呈岩株状产出,被正长岩体穿切破坏,靠近矿体部位发育透辉石矽卡岩化蚀变。辉长闪长岩主要造岩矿物为辉石和斜长石,角闪石较少,根据矿物组合将其定名为辉长闪长岩。本文通过综合分析初步认为,辉长闪长岩与可能与铁成矿作用关系密切,而正长岩为成矿期后破矿岩体,研究结果为龙桥铁矿床的成因提供了新的证据,
The Longqiao iron ore deposit is big one of its kind in the Lu-Zong ore concentration area of Anhui Province. The major ore body is stratoid occurring in the Triassic Dongmaanshan Formation of muddy limestone, brecciated limestone, dolomite, muddy siltstone and quartz sandstone. The syenite intrusion in the ore district was thought to be closely related to mineralization. During production exploration, gabbro-diorite intrusion was found in the process of developing underground drifts within the line 0 across the district. Gabrro-diorite intrusion occurs as stocks cut through by syenite intrusion, with diopside skarn alteration developed close to the ore body. Gabrro-diorite consists mainly of rock minerals of pyroxene and plagioclase with less hornblende, and is so named by its mineral association. Based on comprehensive analysis, this paper suggests that gabbro-diorite was probably closely related to iron mineralization, and syenite intrusion broke the ore body afterwards, thus providing new evidence for the genesis of the deposit.
出处
《安徽地质》
2016年第3期179-181,193,共4页
Geology of Anhui
关键词
庐枞盆地
龙桥铁矿床
辉长闪长岩
层控矽卡岩矿床
Lu-Zong basin
Longqiao iron ore deposit
gabbro-diorite
strata-bound skarn ore deposit
