摘要
在黑龙江东部鸡西盆地下白垩统穆棱组鸡D7井679.19m井段,首次发现了一含金古砂矿层,其中所含重砂矿物有:自然金、自生独居石、碎屑独居石、磷钇矿、锆石、方铅矿、闪锌矿、金红石、钛铁矿、磷灰石、黑云母、绿泥石、黄铁矿、黄铜矿、白钛石、榍石、褐铁矿、赤铁矿、磁铁矿、铁锰矿、勃姆石、氧化铀矿、自然铜和自然铜-锌金属等。矿层厚度约为4.14m,在砂岩薄片中目估重砂体积分数为10%～24%。含金古砂矿层的发现为金的来源提供了新线索。该古砂矿层疑似海岸带沉积环境中形成,如能证实则该矿床远景可观,笔者提出用磁化率测井的方法圈定隐伏古砂矿的建议。此外,由于发现莓状黄铁矿、自然铜-锌金属和自生独居石等,认为古砂矿是在有利于生物成矿作用的沉积环境中形成。
A blinded ancient gold-bearing placer layer is firstly found at 679.19 m segment of the D7 drilling, in the Muling Formation in Jixi basin, eastern Heilongjiang Province. Heavy minerals in placer layer include native gold, authegenic monazite, clastic monazite, xenotime, zircon, galena, sphalerite, rutile, ilmenite, apatite, biotite, chlorite, pyrite, chalcopyrite, leucoxene, titanite, limonite, hematite, magnetite, Fe-Mn minerals, boehmite, uranium-oxide mineral, native copper and native copper-zinc metals etc. The ancient placer layer is thick about 4.14 m. The volume content of heavy minerals in thin section of the placer is estimated to 10%-24%. The finding of gold bearing pacer layer can supply new valuable information for judgement of gold source in this area. Based on sedimentary texture and structure, it is supposed that the ancient placer layer might be formed in coast sedimentary condition.Authors suggest that the magnetic logging method be used to determine the distributing area of blinded ancient placer. Moreover, such minerals as authegenic monazite, framboid pyrite, and native copper-zinc metal in the ancient placer layer indicate that the layer was formed in a favorable sedimentary environment for biomineralization process.
出处
《吉林大学学报（地球科学版）》
EI
CAS
CSCD
北大核心
2010年第6期1278-1286,共9页
Journal of Jilin University：Earth Science Edition
基金
中国地质调查局地质大调查项目(1212010782004)
大庆油田有限责任公司勘探开发研究院委托开发项目(DQYT-1201002-2008-JS-338)
关键词
鸡西盆地
白垩系
隐伏含金古砂矿
自生独居石
金矿
Jixi basin
Cretaceous
blinded gold-bearing ancient placer
authegenic monazite
gold mines
