汉南杂岩区毕机沟一带钒钛磁铁矿成矿规律及找矿潜力研究

THE METALLOGENIC REGULARITY AND PROSPECTING POTENTIAL FOR V-TI MAGNETITE DEPOSIT IN BIJIGOU AREA OF HANNAN BASIC COMPLEX ROCK ZONE

汉南基性杂岩区处于扬子板块北缘,区内自元古代以来岩浆岩分布广泛,其成因总体来说与中元古代末Rodinia超大陆的形成和裂解过程有关。沿该区北东部毕机沟一带目前已发现1处中型、多处小型钒钛磁铁矿床和矿点,岩浆岩主要为闪长岩、辉长岩、花岗岩等,其中中元古代辉长岩为区内主要含矿岩石,矿体在空间分布上受控于辉长岩体,与区域地球化学、地球物理异常相吻合。本文通过区内成矿地质条件、地球化学、地球物理特征进行分析,类比典型钒钛磁铁矿床,总结找矿规律,提出毕机沟矿床成矿类型为晚期岩浆分异-热液型,认为本区钒钛磁铁矿找矿前景广阔,具有形成大型钒钛磁铁矿床的潜力,并提出找矿靶区。

Hannan basic complex rock zone is in the northern edge of Yangtze plate, the magmatic rocks distribu- tion area is large and widespread in the area, it＇ s generally relevant with Rodinia supercontinent formation and cracking process in the late Mesoproterozoic. One medium-sized and several small V-Ti magnetite deposit have been found in Bijigou along the northeast of this area. The magmatic rocks in this area are mainly diorite, granite, gabbro and so on, which Mesoproterozoic gabbro is main ore-bearing rock in the area, and the spatial distribution of the ore body is controlled by gabbro, that is coincide with regional geochemical and geophysical anomalies. By analy- zing ore-forming geological conditions, geochemical and geophysical characteristics were analogied to the typical V- Ti magnetite deposit and the prospecting law in this area was summarized. It is considered that there is a broad prospects to prospecting metallogenic types for the late magmatic differentiation-magmatic hydrothermal, has the po- tential to form large V-Ti magnetite deposit, and the prospecting target area is put forward.