摘要
钙华沉积物记录着重要物理、化学和生物信息,被认为是指示环境变化的重要信息载体。文章选择四川牟尼沟钙华剖面为研究对象,测定钙华沉积物中的有机质、总氮(TN)、总磷(TP)和其他化学元素,综合分析牟尼沟钙华剖面特征和环境指示意义。结果表明:有机质、TN、TP含量为294.66~2366.52 g·kg^(-1),0~0.89 g·kg^(-1),0.03~0.25 g·kg^(-1),在元素含量方面,黑色泥质钙华以SiO_(2)为主,白色钙华、黄色钙华、灰色钙华均以CaO为主,推测黑色泥质钙华沉积于雨季,降水充沛,气候较湿润,而灰色钙华、白色钙华和黄色钙华形成于旱季,降水较少,气候较干冷。
The travertine profiles are located in the Zhaga waterfall in Munigou,Sichuan Province,where the highest altitude ranges from 4,070 m to 2,800 m,and the average annual temperature is 7℃.The study area is situated in the Minjiang fracture zone,with Paleozoic carbonate construction on the east side of the fracture,and shallow metamorphic rocks and slates of the Middle and Upper Triassic Xikang Group on the west side.Travertine is deposited by the stream fed by karst springs,and the mouth of the spring is located on the left bank of the hook upstream of Zhaga waterfall.The travertine deposits are distributed from the mouth of the spring down to the mouth of the gully.Their depositional patterns fall into striated travertine,clastic travertine,etc.,and the type of depositional phase is a dam.The overall travertine profile is about 30-meter thick with horizontal sedimentary construction.In this study,the travertine profiles were investigated in terms of mineralogy and isotope geochemistry.UV spectrophotometry and Xray fluorescence spectroscopy were used to determine the organic matter,total nitrogen,total phosphorus and chemical elements in travertine profile sediments so as to comprehensively analyze the characteristics of the travertine profiles and their significance of environmental indications.The results show that the travertine profiles can be divided into four stages based on sedimentary features such as sediment color,texture and inclusions.Stage 1:1,080-1130 cm,overall dominated by a black muddy travertine layer interspersed with yellow travertine,grey travertine,and white travertine,containing twigs,leaves,and roots;Stage 2:1,130-1,230 cm,overall dominated by a grey travertine layer interspersed with yellow travertine and black muddy travertine layers containing tree roots;Stage 3:1,230-1,353 cm,overall dominated by yellow travertine layers interspersed with black muddy travertine,white travertine and grey travertine;Stage 4:1,353-1,480 cm,overall dominated by a white travertine layer interspersed with ye
作者
何靓雯
代群威
徐荣林
崔杰
安德军
杜伟旗
张婷
蒋瑞阳
冉玥
HE Jingwen;DAI Qunwei;XU Ronglin;CUI Jie;AN Dejun;DU Weiqi;ZHANG Ting;JIANG Ruiyang;RAN Yue(School of Environment and Resource,Southwest University of Science and Technology,Mianyang,Sichuan 621010,China;Huanglong National Scenic Area Administration,Songpan,Sichuan 624000,China)
出处
《中国岩溶》
CAS
CSCD
北大核心
2024年第3期575-584,共10页
Carsologica Sinica
基金
国家自然科学基金-区域创新发展联合基金(U21A2016)
国家自然科学基金(41877288)。
关键词
牟尼沟
钙华剖面
环境代用指标
沉积环境
降水
Munigou
travertine profile
environmental indicators
sedimentary environment
precipitation
