Two kinds of silicalites in Mount Ailao belt, Yunnan Province

作     者：Shangyue Shen Qirong Wei Huilan Cheng Xuanxue Mo Qinglai Feng 

作者机构：China Univ Geosci Fac Mat & Chem Wuhan 430074 Peoples R China 

出 版 物：《Chinese Science Bulletin》 (中国科学通报)

年 卷 期：2000年第45卷第23期

页      面：2176-2181页

核心收录：

学科分类：070903[理学-古生物学与地层学(含：古人类学)] 0709[理学-地质学] 07[理学] 

基　　金：Key Projects of Resource and Environment Key Research Projects of Science and Technology of China, (96-914-01-03) Ministry of Geology and Mineral Resources of China, (95-02-001-02) National Natural Science Foundation of China, NSFC, (49772122) 

主　　题：Yunnan Province Mt. Ailao silicalite radiolarian Si-isotope REE. 

摘      要：Two kinds of radiolarian silicalites at the bottom and top of the ophiolite in the Mount (Mt.) Ailao belt, Yunnan Province, are dealt with in this work in terms of geology, micro-paleontology, isotope and REE. The first kind of silicalite was defined as the turbidite formation. In this category, the radiolarian species lived in the Late Devonian (D3). The corresponding ecologic assemblage, composed of δ30Si (0.4‰-0.5‰, average 0.03‰), δCe (0.77-0.97, average 0.85) and LaN/YbN (0.77-1.06, average 0.96) of silicalite, shows that it occurred in the abyssal environment. The second kind of silicalite was defined as the mud-siliceous formation. Contacting conformably with the basalt of the ophiolite suit, the radiolarian silicalite at the top of ophiolite was in the category of the component units of the ophiolite in the Mt. Ailao belt. In this category, the radiolarian species lived in the Early Carboniferous (C1). The corresponding ecologic assemblage, composed of δ30Si (0.2‰-1.3‰averaging 0.7‰), ?