红格地区钒钛磁铁矿地质特征及地球物理找矿的探讨

[摘 要]攀西红格钒钛磁铁矿是我国大型的钢铁生产基地。攀西红格钒钛磁铁矿床赋存于层状基性和超基性的辉石岩和辉长岩岩体中,仅限于攀西裂谷的古隆起带分布,含矿岩体沿安宁河深断裂、昔格达-元谋断裂、攀枝花大断裂侵入。含矿岩体在时间上仅限于华里西期时段的基性-超基性岩。“三位一体冶(基性-超基性岩、灯影组白云质灰岩、峨眉山玄武岩)的岩性组合,是形成大型、超大型矿床的必要条件。攀枝花含矿岩体的一级韵律层由岩体上部的辉长岩、中部暗色层状辉长岩、下部中粗粒暗色辉长岩夹橄辉岩和橄榄型矿层组成。准确把握攀西钒钛磁铁的矿床特征,是寻找该矿床的有效途径,目前已利用地球物理方法在红格钒钛磁铁矿及外围发现了多处矿点,为这次整装勘查提出了进一步找矿的新思路。

Geological Features of the Vanadium-Titanium Magnetite Deposit in theHongge Area and Its Geophysical Prospecting

Abstract:The vanadium-titanium magnetite deposit lies in the Panxi area,a large-scale steel and iron production base in China. It occurs in layeredmafic and ultramafic pyroxenolite and gabbro rock bodies,and is confined to the paleo-uplift zones of the Panxi rift. The ore-bearing rock bodies intruded along the Anninghe deep fault,the Xigeda-Yuanmou fault and the Panzhihua fault. The ore-bearing rock body is only restricted in the Hercynian basicultrabasic rock. The lithological combination trinity of basic-ultrabasic rock,Dengyingzu Formation. calcareous limestone and Emei basalt are crucial for the large-sized and ultra-large-sized deposits in this region. The first-order rhythm of the ore-bearing Panzhihua ore-bearing rock body consists of upper gabbro,middle dark layered gabbro,lower course-grained melagabbro interbedded with the olive pyroxenite and the olive ore bedseam. Mastering characteristics of the vanadium-titanium magnetite deposit accurately is an effective way for searching for this kind of deposits. Currently,many mine occurrences have been found in the Hongge deposit and its surrounding areas using the geophysics method,suggesting a new idea for further prospecting in this region.