CAJ | 학술논문

在长江中游分布着一些高位的砾石层，尤其是在宜昌与武汉的阳逻附近。为了探讨这些砾石层的磁性特征及物质来源，对它们进行了磁性特征研究，结果表明：①不同砾石层剖面磁性物质的含量明显不同，其中云池砾石层磁性物质的含量最高，善溪窑、红花套、白洋渡砾石层次之，阳逻砾石层含量最低。②SIRM/χ和 F 300值显示，长江中游砾石层磁性矿物类型主要是磁铁矿等亚铁磁性矿物，其中阳逻砾石层不完全反铁磁性矿物含量比例比其他砾石层高。③χARM/χ、χARM/SIRM、χfd值表明，白洋渡、红花套及善溪窑砾石层的磁性矿物中以较粗的磁性颗粒为主，而云池和李家院的磁性矿物颗粒都较细，武汉阳逻砾石层的磁性颗粒以单畴、超顺磁颗粒为主。④宜昌附近的善溪窑、云池、白洋渡、红花套砾石层的磁性特征与长江现代沉积物的特征接近，指示其物质主要来自于长江沉积物；而阳逻砾石层的磁性特征却与江汉平原周边河流的现代沉积物磁性特征有些类似，结合野外砾石层岩性特征，认为阳逻砾石层是长江、汉江与江汉平原周边河流共同作用的产物。
재장강중유분포착일사고위적력석층，우기시재의창여무한적양라부근。위료탐토저사력석층적자성특정급물질래원，대타문진행료자성특정연구，결과표명：①불동력석층부면자성물질적함량명현불동，기중운지력석층자성물질적함량최고，선계요、홍화투、백양도력석층차지，양라력석층함량최저。②SIRM/χ화 F 300치현시，장강중유력석층자성광물류형주요시자철광등아철자성광물，기중양라력석층불완전반철자성광물함량비례비기타력석층고。③χARM/χ、χARM/SIRM、χfd치표명，백양도、홍화투급선계요력석층적자성광물중이교조적자성과립위주，이운지화리가원적자성광물과립도교세，무한양라력석층적자성과립이단주、초순자과립위주。④의창부근적선계요、운지、백양도、홍화투력석층적자성특정여장강현대침적물적특정접근，지시기물질주요래자우장강침적물；이양라력석층적자성특정각여강한평원주변하류적현대침적물자성특정유사유사，결합야외력석층암성특정，인위양라력석층시장강、한강여강한평원주변하류공동작용적산물。
A large quantity of gravel depositions is located in the middle reaches of the Yangtze River,especially at Yichang and Yangluo near Wuhan City.In order to investigate the magnetic characteristics and constrain the source of these gravel depositions,the magnetic characteristics of these sediments were studied.The results are as follows:1)The content of ferromagnetic minerals in these profiles are different,with the Yunchi profile having highest concentrations,followed by Shanxiyao, Honghuatao,Baiyangdu and Yangluo profiles.2)The results of SIRM/χ and F 300 show that magnetic properties in the gravel depositions in the midstream of Yangtze River is dominated by ferromagnetic minerals.The Yangluo profile has the highest antiferromagnetic mineral proportions.3)The values ofχARM/χ,χARM/SIRM and χfd suggest that the magnetic minerals grains in Baiyangdu,Honghuatao and Shanxiyao profiles are coarser, but the magnetic minerals in Yunchi and Lijiayuan profiles are characterized by relatively finer grain.The magnetic particles in Yangluo profile near Wuhan City are dominated by single domain and super-paramagnetic particles. 4 )The magnetic characteristics of Shanxiyao,Yunchi,Honghuatao and Baiyangdu profiles are similar to these of present sediment of the Yangtze River,suggesting that these sediments were fed by the Yangtze River.However,the magnetic characteristics of Yangluo is similar to the modern sediments of the rivers around the Jianghan basin, which means that the sediment in Yangluo comprise a mixture of detritus derived from the Yangtze,Han River and some small rivers on the periphery of the Jianghan basin.