摘要
金属矿化探,过去主要用金属及非金属元素作指标。用有机气体作指标的试验是国外近几年报导的。国内过去未开展过烃气找金属矿的试验工作,因此也尚未研制和试验过适合于金属矿勘探用的轻烃分析方法。本文报导新近研制的轻烃测试方法。样品在真空容器中,用酸分解脱出烃气,用气相色谱法测定。一次可向时完成C1—C5共九项烷烯烃测定。样品的测定下限低,甲烷为0．1μl/kg,报出率100%,相对偏差在±20%内。本方法已经过3000余件样品分析考验,证明方法可靠。已在铅锌矿、金矿和构造断裂地区进行了测量试验,不仅普遍探测到轻烃气的存在,而且均获得了明显的异常显示。初步表明,轻烃气体是一个值得进一步深入研究的良好地球化学指标。在金属矿上进行烃气测量试验,在国内尚属首次。
In the past, mainly metallic and nonmetallic elements were used as indica-
tors in geochemical prospecting for metallic deposits, and the experimental use
of organic gases as indicators has been reported only in foreign literature in
recent years. As no such test has been carried out in China, light hydrocarbon
analytical method suitable for exploration of metallic deposits has pot yet
been developed and tested. This paper presents a newly-developed analytical
method for light hydrocarbon. The sample is placed in a vacuum vessel and
decomposed with acid to release hydrocarbon gases which are then determined
by gas chromatography. Nine items(C1-C5)of alkyl olefin can be determined si-
multaneously. The detection limit for the sample is quite low:0.l μ1/kg for
methane, with detection rate 100% and relative deviation not in excess of
±20%. The analyses of we than 3000 samples prove this method to be re-
liable. Trial survey with this method was conducted in lead-zinc deposits, gold
deposits and faulted areas, where light hydtocarbon gases prove to be extensi-
vely existent and form distinct anomalies. Facts show that light hydrocarbon
gases seem to be a good geochemical indicator which is worth further investi-
gation.
It is for the first time that the hydrocarbon gas survey was performed in
metallic deposits of China.
出处
《物探与化探》
CAS
CSCD
1990年第4期303-312,共10页
Geophysical and Geochemical Exploration
