摘要
经野外取样和地球化学测试分析，即墨温泉喷流沉积物呈现元素的富集并形成Fe，Ba，Li，La，Ce，Sc等10种元素的正异常。喷流沉积物中的Fe／Ti，（Fe＋Mn）／Ti及Al／（Al＋Fe＋Mn）比值分别为22．63，22．76和0．36-0．39，具有高铁低铝的热水沉积地球化学标识特征，符合Bostrom K．的热水沉积的标识；越流沉积物呈现诸多元素的亏损与负异常；越流沉积的Fe／Ti，（Fe＋Mn）／Ti及Al／（Al＋Fe＋Mn）比值仅为5．91，5．97和0．65，不具备热水沉积标识特征；通道-喷口沉积物呈现元素的富集并形成La，Ce，Sc，sr元素的正异常。通道-喷口沉积中的Fe／Ti，（Fe＋Mn）／Ti及Al／（Al＋Fe＋Mn）比值分别为17．14，17．26和0．42，与〉20，〉20±5，〈0．35比值比较，基本具备热水沉积特征，符合Bostrom K的热水沉积的标识。根据上述地球化学标识特征，结合温泉沉积的沉积学、矿物学标识，将即墨温泉沉积物划分为喷流相沉积、越流相沉积和通道-喷口亚相沉积并阐述其“盆下源”沉积模式。
Based on the geochemical data of field samples, it is shown that 10 elements, including Fe, Ba, Li, La, Ce, Pb, K, Sr, Th and Sc, which are enriched in the sediments of the eruptive flow, are characterized by a positive abnormality. The ratios of Fe/Ti, （Fe＋Mn）/Ti and A1/（A1 ＋ Fe ＋ Mn）in the sediments of the eruptive flow are 22.63, 22.76 and 0.36-0.39, respectively characterized by high Fe and low A1 in hydrothermal sedimentation, which is in agreement with the Bostrom K. s, marking in hydrothermal sedimentation. A deficit and negative abnormality of elements appear in sediments of the pass through. The ratios of Fe/Ti, （Fe ＋ Mn）/Ti and A1/（A1 ＋ Fe ＋ Mn） in the sediments of the pass through are only 5.91, 5.97 and 0.65 respectively, indicating the sedimentation does not have the marking of hydrothermal sedimentation. The abundance of elements and positive abnormality of four elements, including La, Ce, Sc, and Sr are formed in the sediments of the thoroughfare-vent. The ratios of Fe/Ti, （Fe ＋ Mn）/Ti and A1/（A1 ＋ Fe ＋ Mn） in the sediments of the thoroughfare-vent are, respectively, 17.14, 17.26 and 0.42, indicating that sediments of the throughfare-vent have the geochemical characteristics of hydrothermal sedimentation. This is in agreement with the Bostrom K. s, marking in hydrothermal sedimentation. Based on the sedimentological-mineralogical charac- teristics, the hot spring sedimentation could be divided into eruptive flow sedimentary facies, pass through sedimentary facies and thoroughfare-vent sedimentary sub-facies. The sedimentary model of “source under the basin” is described in this paper.
出处
《中国海洋大学学报（自然科学版）》
CAS
CSCD
北大核心
2007年第6期968-976,共9页
Periodical of Ocean University of China
基金
山东省自然科学基金(Y2005E03)资助
关键词
即墨温泉
地球化学标识
沉积相
沉积模式
Qingdao Jimo hot spring
geochemical marking
depositional facies
sedimentary model
