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作 者:张水昌[1] 张宝民[1] 边立曾[2] 王大锐[1]
机构地区:[1]中国石油天然气集团公司勘探开发研究院,北京1000832 [2]南京大学地球科学系,南京210093
出 处:《微体古生物学报》2005年第2期121-126,共6页Acta Micropalaeontologica Sinica
基 金:国家重点基础研究发展规划973项目(973G1999043306)。
摘 要:红藻石由红藻形成。绝大部分红藻石与珊瑚藻有关。珊瑚藻形成的红藻石发育于中新生代,早古生代有管孔藻形成的红藻石。本文记录了发现于下花园地区的新元古代青白口系下马岭组四段的红藻石。这类红藻石的中心部分被沥青充填。通过薄片观察发现沥青饼的周围硅化部分存在两类红藻四分孢子囊:一类四分孢子囊包埋于球状构造内,另一类四分孢子囊包埋于叶片状构造内。Rhodoids are built by red algae and most rhodoids are constructed by coralline red algae. The warm water Sporolithaceae were most species abundant during the Cretaceous, but they declined and were rapidly overtaken by Corallinaceae as Cenozoic temperatures declined (Aguirre et al ., 2000). Some rhodoids formed by Solenoporaceae are discovered in Early Paleozoic. This paper describes a kind of rhodoids collected from Xiamaling Formation(900—873Ma). These rhodoids are called “Bitumen biscuit” as the core is filled by bitumen. By means of thin section study, two kinds of tetrasporangia can be found: one kind of tetrasporangia is the sporangia embedded in a spheroid vesicle and another kind is the tetrasporangia embedded in a blade like structure. In the margin part of rhodoids the Solenopora like pattern lobes can be observed. These rhodoids are siliceous with some anatomic structures preserved well.Abstract
关 键 词:张家口市 下花园地区 青白口系下马岭组 红藻石 红藻 珊瑚藻 四分孢子囊 烃源岩 油页岩
分 类 号:Q914.82[天文地球—古生物学与地层学]
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