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放射虫岩是指主要由放射虫壳体堆积的一种“化学-生物化学岩”。放射虫吸收海水中的硅质组成以含水的SiO_2为成分的壳体。在放射虫岩中,常常还有海绵骨针和硅藻等生物遗迹。卡洛瑞(Carozzi,A.V.1960)把已发现的放射虫岩分为四种:砂质放射虫岩、钙质放射虫岩、铁质放射虫岩(红放射虫岩)和炭质放射虫岩(黑放射虫岩)。实际上放射虫岩主要是硅质为主。广东曲江—仁化地区早二叠世“当冲层”的放射虫岩是一种硅质放射虫岩,本文试就其成因、古地理环境的变迁及与成矿和古构造活动的联系作一初步探讨。
Radiolarian rock refers to a “chemical-biochemical rock” that is mainly deposited by radiolarian shells. Radiolarian absorption of seawater siliceous composition of water-containing SiO 2 shell composition. In radiolarian rocks, there are often biological relics such as spongy spicules and diatoms. Carlozzi (AV 1960) has divided the discovered radiolarian rocks into four types: sandy radiolabe, calcareous radiolammite, iron radiolabe (red larva) and carbon radiolabeled rock (Black larvae). In fact, radiolarian rock is mainly siliceous. Radiolarian rock in the “Permian” of the Permian in the Qujiang-Renhua area of Guangdong Province is a siliceous radiolarian rock. This article attempts to discuss its causes, changes in palaeogeomorphology and its relationship with the metallogenic and paleotectonic activities Make a preliminary discussion.