CAJ | 학술논문

二叠纪被认为是全球生物繁盛的重要时期,其大气含氧量、温度等条件和现代地球极为相似,因此,二叠纪古海洋生物和环境的研究对当代环境和气候变化研究具有重要的启示作用.通过分析广西来宾铁桥剖面二叠系的275个海相碳酸盐岩样品的地球化学组成,考察Ca、Mg、Al、Ti及其比值的变化特征,研究它们的生物和环境意义.结果发现,从栖霞组沉积时期到吴家坪组沉积时期,海水中Mg/Ca值总体上呈单调下降趋势,表明海底洋中脊扩张,洋中脊热液循环加快,全球海平面上升;Al/Ti值在栖霞组沉积时期到吴家坪组沉积时期呈现一种起伏式的变化,其中栖霞组沉积中期和茅口组沉积后期表现出与其他时段有显著差异的高值,表明这两个阶段海洋生产力繁盛;在瓜德卢普统一乐平统界线,Al/Ti值低,与玄武岩(Al/Ti值约为6)相近,指示火山活动强烈,为火山活动导致生物灭绝说提供了地球化学新证据.
이첩기피인위시전구생물번성적중요시기,기대기함양량、온도등조건화현대지구겁위상사,인차,이첩기고해양생물화배경적연구대당대배경화기후변화연구구유중요적계시작용.통과분석엄서래빈철교부면이첩계적275개해상탄산염암양품적지구화학조성,고찰Ca、Mg、Al、Ti급기비치적변화특정,연구타문적생물화배경의의.결과발현,종서하조침적시기도오가평조침적시기,해수중Mg/Ca치총체상정단조하강추세,표명해저양중척확장,양중척열액순배가쾌,전구해평면상승;Al/Ti치재서하조침적시기도오가평조침적시기정현일충기복식적변화,기중서하조침적중기화모구조침적후기표현출여기타시단유현저차이적고치,표명저량개계단해양생산력번성;재과덕로보통일악평통계선,Al/Ti치저,여현무암(Al/Ti치약위6)상근,지시화산활동강렬,위화산활동도치생물멸절설제공료지구화학신증거.
Permian, when oxygen content in the air and temperature as well as other parameters were much comparable with those of modern days, is believed to be a very important episode of prolific biology,so researches in paleo-ocean biology and circumstance of the Permian may provide an ideal example for the understanding of modern environment and climate change. In the study, by analyzing 275 marine carbonate samples from Tieqiao section, we first investigate the geochemical composition of Ca、 Mg、Al and Ti,and then interpret Mg/Ca and Al/Ti as the proxies of marine chemistry and paleo-productivity respectively. We found, Mg/Ca value presented a monot.one decline trend from the depositional period of the Qixia Formation to the Wujiapin Formation, and it indicated that ridges expanded, hydrothermal circulation speeded, and global sea level rose; Al/Ti fluctuated from the depositional period of the Qixia Formation to the Wujiapin Formation, with two peaks in the middle depositional period of the Qixia Formation and the late depositional period of the Maokou Formation, and it indicated that two high productivity phases; An intense volcanic event was identified at Guadalupian-Lopingian boundary by a low Al/Ti value, analog to basalt (Al/Ti≈6) .