The application of an infilling 1 ∶ 25 000 stream sediment survey method to ore prospecting in Heishan area of Qinghai Province
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摘要: 青海省格尔木市黑山地区地表存在大量风成沙、风成黄土,为避免其影响,选择1∶2.5万水系沉积物加密测量方法开展前期化探扫面工作,确定采样点密度为40个点/km2,采样介质为水系沉积物,采样粒度为-10~+40目筛内样.通过元素含量、分布及组合特征分析,确定工作区滩间山群a段与侵入岩接触部位具有多金属成矿的可能;对圈出的5个综合异常进行查证,在AS4号综合异常内发现、控制了2条含矿矽卡岩带,并在Ⅰ号含矿矽卡岩带内初步圈定了2条铜多金属矿体,证明1∶2.5万水系沉积物加密测量方法在柴达木盆地周缘荒漠化中高山高原景观区具有较好的找矿效果.Abstract: The study area is located in Heishan area of Golmud in Qinghai Province.Its surface is covered with a large quantity of eolian sand and loess,and hence this area h is not suitable for soil and detritus sampling.An infilling 1 ∶ 25 000 stream sediment survey method was used in early geochemical prospecting.The sampling density is 40 samples per square kilometers and the sampling grain size is-10-+40 mesh.Through analyzing the content,distribution and combination characteristics of elements,the authors hold that the contact zone between the intrusion and the first member of Tanjianshan Group in the study area has a good potential in search for polymetallic deposits.According to the above geochemical evidence,the authors delineated 5 comprehensive anomalies and subsequently evaluated them.Two ore-bearing skarn belts were found,which are confined in the range of AS4 synthetic anomaly.Two Cu-polymetallic orebodies were preliminarily determined in No.1 ore-bearing skarn belt.The results show that the infilling 1 ∶ 25 000 stream sediment survey method has favorable effects in ore prospecting at desertification mountainous plateau land surrounding the Qaidam Basin.
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Key words:
- stream sediment survey /
- infilling survey /
- comprehensive anomaly /
- ore prospecting /
- Heishan area /
- Qinghai
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