鉱床をとりまく岩石と鉱物(シンポジューム)
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概要
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Symposium of the night session in the 31th annual meeting was held at Hokkaido University, Sapporo on August 7, 1977. Dr. M. HUNAHASHI delivered the keynote address to the symposium entitled "Behaviour of quartz in the circumstances of rock formation and ore mineralization", and the four comments were submitted for discussion; M. HAYASHI, Chemical composition of chlorite in mineralized and altered rock at Chitose and Ohe mines, T. YOSHIMURA; A variation of chlorite and it's stem minerals, K. TOMITA, Relation between crystal structure and lineage structure of quartz, and K. TOGARI; Diversity of colour and forming condition of quartz. In Dr. HUNAHASHI's address, he stressed about rocks and minerals surrounding ore deposits as follows. Quartz appears in several types of acidic igneous and metamorphic rocks as their main consitituent mineral. And further, it takes a principal role in. the course of ore mineralization resulting to its high concentration. Though it seems to be the simplest mineral, high and low types are distinguishable as is well known. The former type of quartz coordinates with immediate neighboured quartz grain after Japanese twin law, the later, predominant in and around low temperatured ore deposits, after lineage relation (M. HUNAHASHI, 1973, J. WATANABE, 1971). And in further lower temperature range it is substituted by the formation of chalcedonic quartz, opal and cristobalite. Such variations of quartz formed in the circumstances ranging from high to low temperature may conceive a coordinate indicating a serial relations laid for the rock formation and connecting ore mineralization. In Table I, such mutual relationship among every circumstances in the formation of rocks and ore deposits are briefly summarized.
- 地学団体研究会の論文
- 1979-03-25
地学団体研究会 | 論文
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