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辽西下白垩统义县组湖相碳酸盐岩中的燧石成因
引用本文:陈登辉,巩恩普,梁俊红,李永杰,董旭明.辽西下白垩统义县组湖相碳酸盐岩中的燧石成因[J].地质学报,2010,84(8):1208-1214.
作者姓名:陈登辉  巩恩普  梁俊红  李永杰  董旭明
作者单位:东北大学资源与土木工程学院,沈阳,110004
基金项目:教育部高等学校博士学科点专项科研基金(编号20060145016)资助成果 
摘    要:辽西义县鹰窝山下白垩统义县组砖城子层中部发育一套湖相碳酸盐岩,可识别出4种岩相类型,其中角砾化团块灰岩相中含有大量燧石,所含的燧石可据形态划分为结核状、透镜状和团块状3种类型,据颜色和透明度识别出两种类型。燧石以微晶石英和玉髓为主,含少量的白云石和方解石晶粒。该岩相系相对干旱气候背景下的洪积-漫湖沉积体系中较浅储水洼地沉积,火山活动也具一定的影响力。

关 键 词:燧石  湖相碳酸盐岩  沉积环境  下白垩统  义县组
收稿时间:2009/12/9 0:00:00
修稿时间:1/19/2010 2:41:57 PM

Mechanism of the Chert Formation within the Lacustrine Carbonates from the Lower Cretaceous Yixian Formation, Western Liaoning
chendenghui,gongenpu,Liang Junhong,Li Yongjie and Dong Xuming.Mechanism of the Chert Formation within the Lacustrine Carbonates from the Lower Cretaceous Yixian Formation, Western Liaoning[J].Acta Geologica Sinica,2010,84(8):1208-1214.
Authors:chendenghui  gongenpu  Liang Junhong  Li Yongjie and Dong Xuming
Affiliation:Xi'an Institute of Geology and Minerals Resources,Northeastern University,Northeastern University,Northeastern University,Northeastern University
Abstract:Cherts occur from lacustrine grainstones and packstones of the middle part of the Zhuanchengzi Bed (Yixian Formation, Lower Cretaceous) in Westerm Liaoning Province. Four lithofacies are recognized. The chert in brecciated-nodular limestone includes nodular, lenticular and cloddy types morphologically. Moreover, two types could be defined base on their differentiation of colour and translucency. The chert consists of microcrystalline quartz and chalcedony with small calcite and dolomite crystals lithologically. These facts imply that the environmental setting might be considered as a short-lived isolated ponds in very shallow depressions on the floodplain. Nevertheless, drought climate as well as the volcanic activity reinforced the formation of the cherts.
Keywords:chert  lacustrine carbonates    sedimentary environment    Lower Cretaceous    Yixian Formation
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