Phosphatic microspherules and their geobiological implications from the Frasnian-Famennian transition at the Yangdi section, Guilin, South China

作     者：HUANG Cheng GONG YiMing Huang C;Gong Y M

作者机构：State Key Laboratory of Biogeology and Environmental Geology China University of Geosciences 

出 版 物：《Science China Earth Sciences》 (中国科学（地球科学英文版）)

年 卷 期：2014年第57卷第6期

页      面：943-956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] 0708[理学-地球物理学] 0704[理学-天文学] 

基　　金：supported by National Basic Research Program of China (Grant No. 2011CB808800) National Natural Science Foundation of China (Grant Nos. 41290260, 41072252) Doctoral Fund of Ministry of Education of China (Grant No. 20120145110012) 

主　　题：微球粒 磷酸盐 中国南方 地球化学 生物学 FF 桂林 牙形石动物 

摘      要：Abundant perfectly-preserved phosphatic microspherules have been discovered across the Frasnian-Famennian(F-F)transition from the Yangdi section in Guilin,Guangxi,South *** are mostly spherical or elliptical in shape and about 150μm in diameter with smooth exterior *** microspherule consistently possesses a small dimple on the *** internal texture of microspherules consists of concentric light-colored apatite and dark-colored organic matter bands alternating around a central *** have also been found preserved together with phosphatic microspherules in the same horizon,and the abundance of the former is obviously higher than that of the *** Raman spectral studies show close similarities in spectral patterns between the outer shells of phosphatic microspherules and the blade of the conodont genus Palmatolepis sp.,as well as between the microspherule nucleus and the platform of the same conodont ***,the statistical results and geochemical data demonstrate that the elevated abundance of phosphatic microspherules roughly coincides with the blooms of bacteria and algae,but is later than the sharp increase of oceanic *** phosphatic microspherules are interpreted here to be the‘otoliths’secreted by conodont animals based on the compositional similarities between phosphatic microspherules and conodonts and their interrelated *** addition,an analogous study reveals morphological and textural similarities between fish otoliths and phosphatic *** formation of phosphatic microspherules is probably related to seawater *** speculate that the explosive growth of bacteria and algae is probably caused by the enrichment of nutrients that is most likely associated with the increase of terrestrial inputs,submarine hydrothermal activities or the upwelling anoxic bottom waters in the late Devonian,which would stimulate the conodont animals to secrete phosphatic microspherules—the‘ot