北祁连山石居里一带塞浦路斯型铜矿床岩矿石物性特征
Physical Properties of Rocks and Ores Associated with Shijuli Cyprus-Type Copper-Rich Massive Sulfide Deposit in North Qilian Mountains
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摘要: 通过对石居里一带岩矿石物性测量,可知块状矿石视极化率最高,视电阻率最小,为明显低阻高极化显示。碳质板岩、网脉状矿石、含矿碧玉岩视极化率次之,视极化率6%~9%,视电阻率较高。其余硅质岩、碧玉岩、细碧岩、凝灰质砂岩为高阻低极化,视极化率一般在1%~3%。由物性参数看出,该区实施激电测量,寻找铜硫化物矿产的物性前提是具备的。碧玉岩磁化率为最高,变化值在1030×4π×10-6SI~17515×4π×10-6SI,平均值达4521×4π×10-6SI,次为细碧岩、凝灰质砂岩,磁化率平均为1000×4π×10-6SI,~2000×4π×10-6SI左右,其余碳质板岩、硅质岩、次生石英岩、不纯碧玉岩、矿石均为弱磁性,在几十至几百之间变化。由于矿体与碧玉岩紧密相关,且高纯度的碧玉岩更是比其他岩性见矿率高,故对于以碧玉岩为标志,以磁性寻找碧玉岩以达到间接找矿,物性前提是具备的。
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关键词:
- 视极化率 /
- 视电阻率 /
- 塞浦路斯型块状硫化物矿床 /
- 石居里 /
- 北祁连山
Abstract: The geop hysical exploration in the Shijulia rea has determined that the massive ores have the highest apparent chargeability and the lowest apparent resistivity.The apparent chargeability of 6%～9% for carbon-bearing slates,reticulated ores and ore-bea ring jaspilites is lower than massive ores,but the apparent resistivity is higher.The other rocks,such as silicalite,jaspilite,spilite,tuffaceous sandstone,show high resistivity and low chargeability (1%～3%) in nature.These geophysical parameters indicate that conditions are available in this areas for prospecting copper sulfide depositusing induced polarization method.Susceptibllity of Jaspilite is the highest (1 030～17 515) and the mean is 4 521×4Π×10-6 SI,the follows are spilite and tuffaceous sand stone,their mean susceptibility is 1 000×4 Π×10-6 S I～2 000×4 Π×10-6 S I,the o ther ricks,such as an thrinoids lates,silica lite,secondary quartzites,impure jaspilites and ores,have weak magnetism,varied from several decades to hund reds.As the orebody is very close to jaspilites while the ores are found more often in the high-pure jaspilites than in other rocks.By its higher susceptibility,jaspilite is excellent indication to prospect copper deposit. -
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