Mineral transformation during the weathering of dolerite under cold arid conditions in Antarctica
Mineral transformation during the weathering of dolerite under cold arid conditions in Antarctica
复制标题
南极寒冷干旱条件下辉绿岩风化过程中的矿物转化
DOI：
10.1080/00288306.1984.10422271
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发表时间：
1984
影响因子：
2.2
通讯作者：
I. Campbell
中科院分区：
文献类型：
--
作者：
G. Claridge;I. Campbell
摘要研究了纯白云岩土上形成的土壤的化学风化作用。最初，岩石分解成更小的颗粒是由于物理风化作用。在此过程中，氧化铁矿物发生化学变化，释放出铁和镁，再结晶形成富铁的蒙脱石。富硅和化学抗性较强的矿物积聚在粉砂组分中。在南极寒冷的沙漠环境中，基性火成岩的化学风化和粘土矿物的形成与温暖的岩浆岩相似。只要温度足够高，矿物颗粒周围就会形成盐溶液薄膜，从而有足够的水分进行化学转化，这些过程就会发生
Abstract Chemical weathering taking place in a soil formed on till derived solely from dolerite was investigated. Initially, rock breakdown into smaller particles is by physical weathering. During this process, the ferromagnesian minerals weather chemically, releasing iron and magnesium which recrystallise to form iron-rich montmonllomte In the fine-clay fraction. The silica-rich and chemlcally more resistant minerals accumulate in the silt fraction. Chemical weathering and clay mineral formation in basic igneous rocks in the cold desert environment of Antarctica is similar to that m warmer chmates. These processes can occur whenever temperatures are sufficiently warm to allow the presence of thin films of salt solution around mineral grains, permitting sufficient moisture to be present for chemical transformation to take place