分析了南永3井岩心中常量元素和微量元素特征，证实 Mg、K 和 Na 等元素之高含量值与暖期有关，低值均出现在凉期内。在 K 和 Na，Cd 和 Sr，Li 和 Ba 以及 Ni 和 B 之间存在明显的相关性。以井深 469 cm 为界，其界线上下的元素特征有...分析了南永3井岩心中常量元素和微量元素特征，证实 Mg、K 和 Na 等元素之高含量值与暖期有关，低值均出现在凉期内。在 K 和 Na，Cd 和 Sr，Li 和 Ba 以及 Ni 和 B 之间存在明显的相关性。以井深 469 cm 为界，其界线上下的元素特征有明显不同，意味着约在 698 AD 前后，环境发生明显的变化。展开更多
Analyses of trace elements of the Lower Palaeozoic carbonate rock strata in Beijing show that the contents of As, Hg, F increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate roc...Analyses of trace elements of the Lower Palaeozoic carbonate rock strata in Beijing show that the contents of As, Hg, F increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate rocks to the soil coexisting with carbonate rocks, but the distribution regularity of S is not obvious. In the whole weathered stages, the sorption of As is mainly affected by Fe2O3. In soil Fe2O3 is also the main affecting factor of Hg enrichment. The main existing forms of Hg in primary carbonate rocks should simply be physical adsorption, coprecipitation and false isomorphous form between surface of carbonate rock and Hg. In soil the enrichment of F has little relationship with sul-fides and Fe2O3. In primary carbonate rocks, F is mainly absorbed by sulfides and clay minerals, etc. Weathered samples have closer genetic relationships with primary carbonate rocks. This also implies that weathered carbonate rocks have the close existing forms to that of primary carbonate rocks. In primary carbonate rocks FeS2 and FeS are the main forms of S, and sulfides have fixation effect on some heavy metals, whereas in weathered carbonate rocks and soil the fixation effect is weakened.展开更多
文摘分析了南永3井岩心中常量元素和微量元素特征，证实 Mg、K 和 Na 等元素之高含量值与暖期有关，低值均出现在凉期内。在 K 和 Na，Cd 和 Sr，Li 和 Ba 以及 Ni 和 B 之间存在明显的相关性。以井深 469 cm 为界，其界线上下的元素特征有明显不同，意味着约在 698 AD 前后，环境发生明显的变化。
基金the National Basic Research Municipal Program of China (973 Pro-gram)(Grant No. 2006CB202201)Beijing Natural Science Foundation (Grant No. 8063032)
文摘Analyses of trace elements of the Lower Palaeozoic carbonate rock strata in Beijing show that the contents of As, Hg, F increase from primary carbonate rocks to weathered carbonate rocks and from primary carbonate rocks to the soil coexisting with carbonate rocks, but the distribution regularity of S is not obvious. In the whole weathered stages, the sorption of As is mainly affected by Fe2O3. In soil Fe2O3 is also the main affecting factor of Hg enrichment. The main existing forms of Hg in primary carbonate rocks should simply be physical adsorption, coprecipitation and false isomorphous form between surface of carbonate rock and Hg. In soil the enrichment of F has little relationship with sul-fides and Fe2O3. In primary carbonate rocks, F is mainly absorbed by sulfides and clay minerals, etc. Weathered samples have closer genetic relationships with primary carbonate rocks. This also implies that weathered carbonate rocks have the close existing forms to that of primary carbonate rocks. In primary carbonate rocks FeS2 and FeS are the main forms of S, and sulfides have fixation effect on some heavy metals, whereas in weathered carbonate rocks and soil the fixation effect is weakened.
