| 词汇 | siderite |
| 释义 | BETA Examples of sideritesiderite isn’t in the Cambridge Dictionary yet. You can help! Limonite/siderite nodules (up to 20 cm diameter) within sandstones are locally more abundant than in underlying units. This suggests the hematite crystals are not oxidation products of siderite, because pyrite is easily altered to goethite under an oxygenated atmosphere. This stage of siderite cement is characterized with relatively rapid and irregular compositional zoning and minor dissolution phases. Most of the samples selected were dominated by one of the siderite phases although a few contained mixtures of two dominant phases. The member consists of coals, claystones and siltstones rich in siderite concretions, and three to four levels of sandstone, each 2-10 m thick. Two periods of dissolution occurred between precipitation of different stages of siderite cement. The resultant products were unreacted siderite, magnetite and pyrrhotite. Figure 6a-d documents the transition zone of an inorganic, clay mineral-dominated layer to a siderite layer. During dehydration, fractures at the top and the bottom of the algal layer and at the transition zone of the siderite layer are formed. Only samples containing major amounts of siderite that lacked other carbonate cement types were selected for stable isotope analysis. Attention is focused on the siderite, and only a short description of the other diagenetic minerals is provided here. This paper suggests that tectonic activity can, by altering the hydraulic gradient, also influence pore water chemistry and lead to dissolution of cement, made clear by zoning within siderite crystals. The related ironstone beds contain low grade oolitic siderite and chamosite ores which were worked commercially in the early 20th century. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. This process formed siderite in the sediments surrounding the remains, forming detailed casts of their structure. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Associated minerals include biotite and other micas, chlorite group minerals, quartz, zircon, certain feldspars, analcime, anatase, brookite, rutile, siderite, and apatite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. Associated minerals include metavivianite, ludlamite, pyrite, siderite and pyrrhotite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. An example of a mineral in iron-rich rock containing carbonates is siderite and an example of minerals in an iron-rich rock containing silicate is chamosite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. It is made by phyllites, quartzites, porphyrys and limestones commonly metamorphosed to siderite and magnesite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. They consist of concentric inter-bedded cones of calcite or more rarely gypsum, siderite or pyrite. From Wikipedia This example is from Wikipedia and may be reused under a CC BY-SA license. |
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