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最近对石灰岩磁性的研究根据两个理由证明,菱铁矿矿物在古地磁学中可能是极为重要的。第一,无论在取样之前、取样期间、或取样之后产生的菱铁矿的氧化产物,次生(子体)磁性矿物(磁铁矿、磁赤铁矿、赤铁矿)能够完全改变石灰岩样品的磁性;不了解这一点,将是造成研究灰岩,尤其是古生代灰岩的古地磁失败的一个主要原因。第二,弱磁性岩石中的菱铁矿指示了古地磁研究有取得成功的可能。因为,菱铁矿的存在可以指出原生磁载体仍旧是完好的,采用合适的退磁方法能够取得成功的结果。因此,我们断言,在缺氧深海沉积物的微环境下可以由铁的细菌异价还原产生的铁(Ⅱ)形成菱铁矿。
Recent studies of limestone magnetism have proven, based on two reasons, that siderite minerals may be of paramount importance in paleomagnetism. First, the secondary (daughter) magnetic minerals (magnetite, maghemite, hematite) can completely change the limestone sample either before sampling, during sampling, or after oxidation of siderite produced after sampling Without knowing this, it will be one of the main reasons for the failure of the paleomagnetic study on the limestone, especially the Paleozoic limestone. Second, siderite in weakly magnetic rocks indicates the potential for success of paleomagnetic studies. Because the presence of siderite can indicate that the native magnetic carrier is still intact, a successful demagnetization method can achieve successful results. Therefore, we assert that siderophore can be formed from iron (II) produced by the differential reduction of iron bacteria in the microenvironment of anoxic deep sea sediments.