CAJ | 학술논문

祁连山木里三露天天然气水合物与碳酸盐相伴产出是一种常见现象。为探讨这些碳酸盐的形成环境，对碳酸盐进行了矿物 X 射线衍射分析、主微量元素测试以及碳氧同位素测试。X 射线衍射结果表明，样品中碳酸盐矿物主要由方解石、白云石以及少量菱铁矿组成。微量元素和稀土元素特征显示碳酸盐形成于干旱氧化环境。δ13 CV PDB为－2.3‰～3.77‰，平均为2.43‰；δ18 OV PDB为－17.90‰～－10.69‰，变化范围不大，碳氧同位素显示碳酸盐矿物中的碳可能为天然气水合物分解、白云石沉淀和湖水混染等联合作用所致，氧的来源可能受大气降水影响。
기련산목리삼로천천연기수합물여탄산염상반산출시일충상견현상。위탐토저사탄산염적형성배경，대탄산염진행료광물 X 사선연사분석、주미량원소측시이급탄양동위소측시。X 사선연사결과표명，양품중탄산염광물주요유방해석、백운석이급소량릉철광조성。미량원소화희토원소특정현시탄산염형성우간한양화배경。δ13 CV PDB위－2.3‰～3.77‰，평균위2.43‰；δ18 OV PDB위－17.90‰～－10.69‰，변화범위불대，탄양동위소현시탄산염광물중적탄가능위천연기수합물분해、백운석침정화호수혼염등연합작용소치，양적래원가능수대기강수영향。
It is a common phenomenon that gas hydrate occurs with carbonate in Sanlutian of Muli of Qilian Mountains.In order to discuss the formation environment of carbonate,the X ray diffraction analysis,the main-trace element and the carbon and oxygen isotope test of the carbonates were carried out.X ray diffraction results show that the carbonate minerals in the samples are mainly composed of calcite,dolomite and a small amount of siderite.Trace elements and rare earth elements show that the carbonate minerals are formed in the dry and oxi-dizing environment.δ13 CV PDB is -2.3‰ to 3.77‰,and the average value is 2.43‰;δ18 OVPDB is -17.90‰to -10.69‰,and the variation is small.Carbon and oxygen isotopes show that the carbon in carbonate may be influenced by the combined effects of gas hydrate dissociation,dolomite precipitation and lake water pollu-tion,and the possible sources of oxygen may be influenced by the atmospheric rainfall.