遗迹化石Rhizocorallium中莓状黄铁矿对古环境古生态的指示——以豫西南上泥盆统为例

发布时间：2018-06-15 01:46

本文选题：遗迹化石 + Rhizocorallium　；参考：《沉积学报》2017年03期

【摘要】：豫西南淅川上泥盆统王冠组地层中发育大量与层面平行且具有蹼纹的U形遗迹化石Rhizocorallium。利用环境扫描电镜对Rhizocorallium进行微观观察,发现在其边缘管和蹼纹内部发育大量不同形态的莓状黄铁矿及莓状铁氧化物(单晶为五角十二面体,八面体,立方体和近球形),与之对应的围岩中仅见少量黄铁矿单晶颗粒。表面具有覆盖膜的莓状黄铁矿大多存在于潜穴内部,其中边缘管中莓状黄铁矿的单晶直径(0.672~1.603μm,平均直径1.063μm)较之蹼纹中部的(0.376~0.877μm,平均直径0.5μm)的大。上述特征显示出潜穴中莓状黄铁矿的存在可能与硫酸盐类还原菌有关。Rhizocorallium边缘管和蹼纹中高丰度莓状黄铁矿的发现表明:遗迹化石Rhizocorallium可能是造迹者精心构筑的觅食—花园。由于食物供应和氧化还原条件的不同,Rhizocorallium造迹者在其潜穴内部培植不同的微生物,形成一个互利共生的群落。
[Abstract]:There are a large number of U-shaped trace fossils Rhizocorallium in the upper Devonian Wangguan formation in Xichuan southwest Henan Province which are parallel to the plane and have webbed grain. The microscopic observation of Rhizocorallium by environmental scanning electron microscope showed that a large number of different forms of raspberry pyrite and raspberry iron oxide (single crystal were pentagonal dodecahedron, octahedron) were found in the edge tube and webbed grain of Rhizocorallium. Only a small amount of pyrite single crystal particles are found in the corresponding surrounding rock. Most of the raspberry pyrite with covered film are found in the subcave, in which the single crystal diameter of raspberry pyrite in the edge tube is 0.672n1.603 渭 m, with an average diameter of 1.063 渭 m), which is larger than that in the middle of webbed grain (0.376c0.877 渭 m, average diameter 0.5 渭 m). The above characteristics suggest that the presence of raspberry pyrite in the crypt may be related to the sulfate-reducing bacteria. The discovery of Rhizocorallium marginal tube and high abundance raspberry pyrite in webbed grain suggests that the remains of the fossil Rhizocorallium may be a well-constructed foraging garden. Because of the different food supply and redox conditions, Rhizocorallium creators cultivated different microbes in their crypts, forming a mutually-beneficial community.
【作者单位】：河南理工大学资源环境学院河南省生物遗迹与成矿过程重点实验室;中原经济区煤层(页岩)气河南省协同创新中心;
【基金】：国家自然科学基金项目(41602112,41290260) 高等学校博士学科点专项科研基金项目(20134116120002) 中国科学院资源地层学与古地理学重点实验室开放基金(2015KF05) 河南理工大学青年骨干教师计划(672105/195);河南理工大学博士基金项目(B2013-77)~~
【分类号】：P534.44;Q91

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