Utility of geochemical analysis of trace fossils : Case studies using Phycosiphon incertum from the Lower Jurassic shallow-marine (Higashinagano Formation, southwest Japan) and Pliocene deep-marine deposits (Shiramazu Formation, central Japan)
Utility of geochemical analysis of trace fossils : Case studies using Phycosiphon incertum from the Lower Jurassic shallow-marine (Higashinagano Formation, southwest Japan) and Pliocene deep-marine deposits (Shiramazu Formation, central Japan)
复制标题
痕迹化石地球化学分析的效用：利用来自下侏罗统浅海（日本西南部东长野组）和上新世深海沉积（日本中部白间组）的不定藻管虫进行案例研究
DOI：
10.1080/10420940.2013.877008
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发表时间：
2014
期刊：
影响因子：
0.8
通讯作者：
K.
中科院分区：
文献类型：
--
作者：
Izumi;K.
下侏罗统东长野组和上新世岛津组藻管藻化石的元素和矿物学分析表明，核壳和地幔的成分存在显著差异，核壳中的Al 2 O3/SiO2比值（层状硅酸盐和网硅酸盐的一般代表）显著高于地幔（P < 0.01）。所获得的数据有力地表明，粘土矿物肯定集中在岩心中，而粗颗粒（即，石英、长石）富集在地幔中。这与人们普遍认为的藻管生产者的解释是一致的;也就是说，它选择性地摄取和排泄粘土大小的沉积物颗粒，并挑选出粗颗粒。粒子选择程度的差异也得到了承认;东长野P的示踪剂。incertum表现出更大程度的选择性。这可能是由于在最佳觅食存款喂养活动的主机沉积物的粘土矿物学的影响，或在机械的后果，颗粒选择诱导的有机质含量，或在其他遗迹分类群的数量从每个形成的差异。
Elemental and mineralogical analyses ofPhycosiphon incertumfrom the Lower Jurassic Higashinagano Formation and Pliocene Shiramazu Formation revealed that the core and mantle have significantly different compositions; the Al2O3/SiO2ratio, a general proxy for phyllosilicates to tectosilicates, showed a significantly (P < 0.01) higher value in the core than in the mantle. The obtained data strongly suggest that clay minerals are certainly concentrated in the core while coarse grains (i.e., quartz, feldspar) are enriched in the mantle. This is in agreement with the commonly believed interpretation of thePhycosiphon-producer; namely, it selectively ingested and excreted the clay-sized sediment grains and sorted out coarse grains. Difference in the degree of particle selection was also recognized; the tracemaker of the HigashinaganoP. incertumshowed greater degree of selectivity. This may be due to the differences in optimal foraging deposit-feeding activities affected by clay mineralogy of the host sediments, or in mechanistic consequences of particle selection induced by organic matter content, or in the number of other ichnotaxa recognized from each formation.