According to the analysis of grain size, mineral composition and inclusion in quartz grain of the suspended and bed load sampled from the Changjiang (Yangtze) River and the Huanghe (Yellow) River, the authors reveal t...According to the analysis of grain size, mineral composition and inclusion in quartz grain of the suspended and bed load sampled from the Changjiang (Yangtze) River and the Huanghe (Yellow) River, the authors reveal the differentiation of loads between the two rivers. In the Huanghe River the size of suspended load is coarser than that in the Changjiang River, while the bed load is on the contrary. Through heavy mineral analysis, the biotite content of the Huanghe River loads is much higher than that of the Changjiang River, and the monomorillonite content of the former is about two times higher than the latter. All those may be attributed to the effects of different material sources and hydraulic conditions on load. The analysis of inclusion in quartz grain definitely illustrates the environmental difference of material sources between the two rivers. In the meantime, it provides a new method in seeking source of river load.展开更多
振荡构造是浅表地质体在冲击作用或冲击波作用下产生振荡,而在岩石矿物中形成的变形构造,是瞬间超高压(5—10GPa)作用的产物,具有高应变速率(super high strain rate,>10~2s^(-1)).振荡构造分布不广,与区域构造应力场不匹配,但对其研...振荡构造是浅表地质体在冲击作用或冲击波作用下产生振荡,而在岩石矿物中形成的变形构造,是瞬间超高压(5—10GPa)作用的产物,具有高应变速率(super high strain rate,>10~2s^(-1)).振荡构造分布不广,与区域构造应力场不匹配,但对其研究,不仅具有地质意义,而且具有天文意义.冲击造成的地壳振荡有可能是导致冈瓦纳解体的直接作用.一般来讲,目前技术尚不能捕捉地质体在波的作用下留下的信息,但在强烈冲击波的作用点。展开更多
文摘According to the analysis of grain size, mineral composition and inclusion in quartz grain of the suspended and bed load sampled from the Changjiang (Yangtze) River and the Huanghe (Yellow) River, the authors reveal the differentiation of loads between the two rivers. In the Huanghe River the size of suspended load is coarser than that in the Changjiang River, while the bed load is on the contrary. Through heavy mineral analysis, the biotite content of the Huanghe River loads is much higher than that of the Changjiang River, and the monomorillonite content of the former is about two times higher than the latter. All those may be attributed to the effects of different material sources and hydraulic conditions on load. The analysis of inclusion in quartz grain definitely illustrates the environmental difference of material sources between the two rivers. In the meantime, it provides a new method in seeking source of river load.
文摘振荡构造是浅表地质体在冲击作用或冲击波作用下产生振荡,而在岩石矿物中形成的变形构造,是瞬间超高压(5—10GPa)作用的产物,具有高应变速率(super high strain rate,>10~2s^(-1)).振荡构造分布不广,与区域构造应力场不匹配,但对其研究,不仅具有地质意义,而且具有天文意义.冲击造成的地壳振荡有可能是导致冈瓦纳解体的直接作用.一般来讲,目前技术尚不能捕捉地质体在波的作用下留下的信息,但在强烈冲击波的作用点。