龙门山早-中泥盆世Chondrites类型及其环境意义  

Ichnogenera of Chondrites of the early-middle Devonian in Longmenshan area of China and its environmental significances

作　　者：姜涛 李凤杰[1] 杨晓琪 荆锡贵 成晓雨 张昊 沈凡 JIANG Tao;LI Fengjie;YANG Xiaoqie;JING Xigui;CHENG Xiaoyu;ZHANG Hao;SHEN Fan(State Key Laboratory of Oil Gas Reservoir Geology and E：cploitation,Chengdu University of Technology,Chengdu 610059,China;Xinjiang Coal Natural Gas Transmission Pipeline Co.,Ltd.,SINOPEC,Beijing,100728,China)

机构地区：[1]油气藏地质及开发工程国家重点实验室(成都理工大学),成都610059 [2]新疆煤制天然气外输管道有限责任公司,北京100728

出　　处：《成都理工大学学报（自然科学版）》2018年第3期334-343,共10页Journal of Chengdu University of Technology: Science & Technology Edition

基　　金：国家自然科学基金项目(41172100);成都理工大学沉积地质学科研创新团队项目(KYTD201703)

摘　　要：四川龙门山地区下-中泥盆统有丰富的丛藻迹遗迹化石,可识别出8种类型,包括:Chondrites expansus、Chondrites cf.fenxiangensis、Chondrites filiformis、Chondrites isp.、Chondrites targonii、Chondrites type-C、Chondrites cf.type-C和Chondrites intricatus,它们的组合类型有3种:单一种类型、两种组合类型和多种组合类型。Chondrites遗迹化石分布于滨岸-陆棚的沉积环境中,分属于Chondrites-Phycodes和Chondrites-Lockeia遗迹化石组合。其中Chondrites-Phycodes组合代表食物充足、氧含量相对较低的浅水陆棚环境,而Chondrites-Lockeia组合代表氧含量充足的常氧环境浅水陆棚环境。Chondrites遗迹化石的沉积环境包括深水陆棚凝缩段环境、浅水陆棚环境和风暴沉积环境等。保存于深水凝缩段中的Chondrites遗迹化石反映贫氧相环境,其余2种则代表常氧相环境。Chondrites虫孔直径大小与古氧相之间并不存在直接的对应关系。Total 8 ichnospecies of the Chondrites fossil, including Chondrites expansus,Chondrites cf. fen：riangensis, Chondrites filiformis, Chondrites isp., Chondrites targonii, Chondrites type C, Chondrites cf. type C and Chondrites intricatus are preserved and identified in the early-middle Devonian strata of Guixi shawozi section, sichuan, China. These Chondrites ichnospecies belong to 3 Chondrites ichnocoenoses, single Chondrites ichnospecies type, double Chondrites ichnospecies type and multiple Chondrites ichnospecies type respectively. The Chondrites trace fossils distributed in shore to shelf deposit environment are appertained to ChondritesPhycodes ichnocoenosis and ChondritesLockeia ichnocoenosis, the ChondritesPhycodes ichnocoenosis represent shallow shelf surrounding with abundant food and relatively low oxygen content. However, the ChondritesLockeiaichnocoenosis represent shallow shelf, a normal oxygen condition with plenty of oxygen environment. It reveals that these Chondrites trace fossils lived in 3 kinds of sedimentary environment, including deep water shelf condensed section, shallow shelf and storm deposit environment in the Longmenshan area. Besides, Chondrites fossils in condense section reflect suboxic environment, the rest represents normal oxygen environment. There is no correspondence between Chondrites branch diameter and its palaeo oxygenation facies.

关 键 词：CHONDRITES 泥盆纪 遗迹化石 环境意义 龙门山 

分 类 号：P534.44[天文地球—古生物学与地层学] Q915.22[天文地球—地质学]