CAJ | 학술논문

对1998年7月发现的辽宁岫岩县苏子沟镇罗圈里直径1.8 km的撞击坑构造作了一系列地质、地球化学测试工作。从坑内出露的基岩（下元古界辽河群里尔峪组变质砂岩）与充填碎屑物质界面上取样，经XRD定性分析显示有自然铂、锇铱矿、自然铑、自然铱的存在。进一步对这一类样品作等离子质谱分析（ICP-MS），则发现有PGE异常。特别是Pt，Pd，Ru甚至高于原始地幔的丰度值。进一步淘选坑里重砂样品则发现数颗粗铂矿物。已作电子探针分析表明PGE质量分数： Pt为85.30%～98.68%, Pd为0.45%～0.87%, Rh为0.56%～0.74%, Os为0.66%～1.31%, Ir为1.72%～2.43%, Ru为0.16%～0.31%,此外 Ni为0.00%～0.50%, Fe为4.98%～5.42%。笔者认为这种PGE元素异常和粗铂矿的发现是陨石及其撞击作用的重要依据之一。
대1998년7월발현적료녕수암현소자구진라권리직경1.8 km적당격갱구조작료일계렬지질、지구화학측시공작。종갱내출로적기암（하원고계료하군리이욕조변질사암）여충전쇄설물질계면상취양，경XRD정성분석현시유자연박、철의광、자연로、자연의적존재。진일보대저일류양품작등리자질보분석（ICP-MS），칙발현유PGE이상。특별시Pt，Pd，Ru심지고우원시지만적봉도치。진일보도선갱리중사양품칙발현수과조박광물。이작전자탐침분석표명PGE질량분수： Pt위85.30%～98.68%, Pd위0.45%～0.87%, Rh위0.56%～0.74%, Os위0.66%～1.31%, Ir위1.72%～2.43%, Ru위0.16%～0.31%,차외 Ni위0.00%～0.50%, Fe위4.98%～5.42%。필자인위저충PGE원소이상화조박광적발현시운석급기당격작용적중요의거지일。
The authors have carried out a systematic geological investigation and geochemical analyses on the annular structure of the meteorite impact crater in Luoquanli of Xiuyan County, Liaoning Province, China, which is 1.8 km in diameter and was discovered in July of 1998. The samples were collected from the boundary between Quaternary cover and underlying Proterozoic basement within the crater. The XRD analyses showed the existence of Platinum, Iridosmine, Rhodium and Iridium. The ICP-MS analyses indicated appreciable PGE anomaly-the respective content of Pt, Pd and Ru even exceed their abundances in proto-mantle. In addition, platina grains were revealed from panned samples. The composition of the platina given by EPMA is as follows (in mass percentage): Pt: 85.30% ～ 98.68%, Pd: 0.45% ～ 0.87%, Rh: 0.56% ～ 0.74%, Os: 0.66 %～ 1.31%, Ir: 1.72% ～ 2.43%, Ru: 0.16% ～ 0.31%, Ni: 0.00% ～0.50%, Fe: 4.98% ～ 5.42%. The authors consider the discovery of PGE anomaly and platina as significant evidence for confirming the meteorite impact event.